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2015 Spring



Workshop on Sustainable solutions for restoration & conservation of cultural heritage

Cultural Heritage consists of tangible and intangible, natural and cultural, movable and immovable assets inherited from the past. It is our legacy from the past, what we live with today, and what we pass on to future generations. Access, preservation and education about Cultural Heritage(CH) are essential for the evolution of people and their culture, since our CH represents an irreplaceable source of life and inspiration (creativity).

The CH has been absent from the sustainable development debate, despite its crucial importance to societies. Globalization, urbanization and climate change can threaten CH. The challenging tasks are both managing cultural heritage while aiming for sustainable development and managing sustainability while redeveloping cultural heritage. There is a general need for further studies and research to better understand the dynamic relationship between heritage conservation and the various dimensions of sustainable development;

The aim of the workshop is to stimulate and encourage scientific research devoted to the sustainable development of cultural heritage and to the positive contribution of cultural heritage management towards a sustainable environment, by promoting innovative research and practices and improving the current materials and methods and the development and applications of the emerging ones. A large and varied community is involved in Cultural Heritage and Sustainable Development (built environment and sustainability fields) and it includes international experts from academics, as well as practitioners and students. 


Hot topics to be covered:


  • Development and application of sustainable materials and methods for CH conservation and restoration
  • Environmental-friendly approaches and safety solutions
  • Current and emerging technologies and best practices
  • Monitoring the environmental conditions (outdoor and indoor contaminants and pollution, hydro-geological and seismic risks)
  • Maintenance and sustainability
  • Case History
  • Cultural heritage and sustainable development – legislation, Cultural Heritage Impact Assessment, effects of climate change, ecological sustainability, social sustainability, economic sustainability
  • Risks and ecological sustainability management


Scientific Committee:


  • Luigi Campanella, Università Sapienza, Rome (I)
  • Maria Pia Casaletto, CNR ISMN, Palermo (I)
  • Costas Fotakis, Foundation for Research and Technology FORTH, Heraklion/Crete (GR)
  • Marta C. Laurenco, Museus Univ. Lisboa (P)
  • Claire Pacheco, Centre de Recherche et de Restauration des Musées de France, Paris (F)
  • Jerry Podany, Getty Museum, Pacific Palisades (USA)
  • Max Schvoerer, Univ Bordeaux (F)
  • Sebastien Soubiran, Univ. Strasbourg (F)
  • Cornelia Weber, Univ. Berlin (D)


Advisory Committee:


  • Giacomo Chiari (USA)
  • Jean Pierre Massue, E-MRS (F)
  • Paul Siffert, Univ. Strasbourg (F)
  • Michael Stuke, Max-Planck-Institute Göttingen (D)
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New trend in CH : G. Padeletti
Authors : Dimitris Kafetzopoulos
Affiliations : Institute of Molecular Biology & Biotechnology (IMBB) Foundation for Research & Technology - Hellas (FORTH) Nicolaou Plastira 100, Vassilika Vouton, GR 70013 Irakleion Crete, GREECE

Resume : The sciences focusing on the study of human genetic identity, human evolution, diversity, as well as cultural and natural heritage have become today very dynamic and multidisciplinary principles. Indeed, the study of ancient humans and their environments, the biological remains and the artefacts that are retrieved during the excavation of archaeological sites, requires an ever-increasing diversity of analytical approaches and a truly pluridisciplinary research strategy to reveal and interpret the information they have preserved. Nevertheless, scientific research progress and developments in some of these disciplines remains hampered by the lack of common standards, limited suitable facilities, need for specialized technological solutions, tools and methods, scattered (almost inaccessible) heterogeneous data, poorly annotated specimens, and lengthy, laborious access procedures, which can differ both from country to country and from collection to collection. Despite these obstacles, the awareness of our past, be it on the level of our identity as human beings or our history as ethnic groups, appears to be one of the fundamental and primordial concerns on which we build our self-consciousness, understand our existence and gaze toward our future. Therefore, it is not surprising that palaeoanthropological, bioarchaeological and genetic diversity studies yield high impact publications, receive broad interest and attention, driven by the general public’s thirst for better understanding our origin, heritage and destination and thus developing both our personal and collective identities and pride.

Metal Conservation : M. Stuke
Authors : E. Angelini*, F. Civita+, S. Corbellini^, A. Giovagnoli°, S. Grassini*, M. Parvis^
Affiliations : *Dipartimento di Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Torino, Italy +Museo Stibbert, Firenze, Italy °Istituto Superiore per la Conservazione ed il Restauro (ISCR), Roma, Italy ^Dipartimento di Elettronica e Telecomunicazioni (DET), Politecnico di Torino, Torino, Italy

Resume : The Stibbert Museum in Florence has been chosen for a monitoring campaign of the environmental conditions due to the variety of historical showcases and of artefacts displayed within them. In particular the monitoring was performed in the areathathouses the Japanesecollection,includingsuits of armours, hundreds of helmets, swords, spears, swordguards and many metal fittings. Almostallitems date from the Momoyama and Edo periods (1570-1868) with fewexamples of earlier productions. The aim is to develop a highly sensitive and innovative methodology for evaluating the safety level index of the museum indoor areas, and more specifically of the interior of the showcases, with respect to the metallic artefacts. A set of copper samples has been coated with a nanostructured Cu thin film, in order to obtain a set of reference specimens characterised by higher corrosion susceptibility with respect to bulk materials. These samples, thanks to the nanostructure of the copper deposited layer and the high surface area, should allow to assess the air aggressiveness of the showcaseand of the exhibition room in short-time. Cu nanostructured thin films have been deposited by plasma sputtering. The large dimension of some showcases may lead to humidity and temperature differences from point to point, which might be responsible for different corrosion rates of the metallic artefacts exposed inside. In order to assess these differences a multi point monitoring system was arranged to measure relative humidity (RH%) and temperature (T°C) in different points of some selected showcases. The system is based on a network of small autonomous smart sensors, which have the capability of logging T and RH and the possibility of sending the results to an external personal computer without opening the showcases. This system allows for a continuous completely non-invasive monitoring without any alteration of the normal environmental microclimate. The sensors with a footprint of about 2 cm and a height of 6 mm, communicate with the PC via a wireless link and are powered by a small battery whose duration, in normal operating conditions, exceeds one year. The sensors can be programmed to acquire T and RH at any rate (from 2s to 1h) and have a logging memory of 3000 data. As confirmed by the monitoring of T and RH, the environmental conditions inside the Stibbert Museum cannot be considered totally safe for the artefacts conservation, but contemporarily not severe enough to induce corrosion attacks on the copper reference materials exposed for short period.

Authors : Dario Allegra2, Enrico Ciliberto1, Paolo Ciliberto2, Giuseppe Petrillo3, Filippo Stanco2 and Claudia Trombatore3
Affiliations : 1 Dipartimento di Scienze Chimiche viale A. Doria 6, Catania Italy, 2 Dipartimento di Matematica ed Informatica viale A.Doria 6, Catania Italy, 3 Dipartimento di Scienze Mediche Chirurgiche e Tecnologie Avanzate ‘G.F. Ingrassia, via S.Sofia Catania

Resume : The regular format for ancient works of literature was the papyrus roll. Recently many efforts to perform virtual restoration of this archaeological artifact have been done. In fact the case of ancient rolled papyrus is very intriguing. Old papyruses are the substrates of very important historical information, probably being the use of papyrus dated to the Pre-Dynastic Period. Papyrus degradation is often very hard so that physical unrolling is sometime absolutely impossible. In this communication authors describe their effort in setting a new virtual restoration methodology based on software manipulation of X-ray tomographic images. A realistic model, obtained by painting a hieroglyph inscription of Thutmosis III on a papyrus substrate made by the original method described by Plinius the Elder and by pigments and binders compatible with the Egyptian use (ochres with natural glue), was made for the X-ray investigation. A GE Optima 660 64 slice was used to obtain a stack of tomographic slices of the rolled model. Each slice appears as spiral. The intensity variations along the cross section result from ink on the papyrus. The files were elaborated with original software, written by the use of MATLAB high level language, and the final result was quite similar to the radiography of the physically unrolled sheet. The methodology can be easily transferred to other tomographic investigations such as NMR tomography. Keywords: X-Rays, Axial tomography, Papyrus Unrolling, Virtual Restoration. References V. Mocella, E. Brun, C. Ferrero, D.Delattre. ‘Revealing letters in rolled Herculaneum papyri by X-ray phase-contrast imaging’, Nature Communications, 2015; 6: 5895 24. R. Baumann, D.C.Porter, W.B.Seales, “The Use of Micro-CT in the Study of Archaeological Artifacts”, 9th International Conference on NDT of Art, Jerusalem Israel, 25-30 May 2008 W.B. Seales, and Y. Lin, “Digital restoration using volumetric scanning.” In Proceedings of the Fourth ACM/IEEE-CS Joint Conference on Digital Libraries (June 2004): 117-124 C.Basile and A.DiNatale ‘Project for Conservation of Papiri in Egypt’ in ‘Proceedings 4th Congress on Science and Technology for the Safeguard of Cultural Heritage in the Mediterranean Basin’ A.Ferrari Ed. Vol.II pag. M. Aceto, A. Agostino, E. D’amicone, G: Fenoglio, M. Pozzi Battaglia, L. Vigna, “The cartonnage on papyrus: plasters, colours and inks. Excavations of Egyptian Museum of Turin at Assiut (1905-1910)”, Proceedings 4th International Congress Science and Technology for the Safeguard of Cultural Heritage in the Mediterranean Basin, Cairo, 203-204 (2009). C. Sturtewagen ‘Geroglifici svelati’ Effelle publ., Bologna 1987.

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Conservation issues -1 : J. Veiga
Authors : Kaori FUKUNAGA, Tomofumi IKARI, Kikuko IWAI
Affiliations : National Institute of ICT; Spectra Design; Iwai Art Conservation Institute

Resume : The imaging technique using the frequency band in terahertz (THz) region (0.1 to 10 THz) has become an emerging topic heritage science. The biggest advantage of THz imaging is the nondestructive depth profiling by using THz pulse-echo in time domain. The delay of each reflection pulse from internal interface corresponds to the distance from the surface, and thus the layer structure can be obtained at any position of the painting, without taking a sample. This method has been practically used to observe preparation layers of panel paintings and screens. In the case of canvas paintings, the preparation layer has been considered too thin to be analysed by THz pulse-echo imaging. We have observed an oil canvas painting from a private collection, which partially has thick multiple paint layers. The thick paint layers can be recognised at edges and the original canvas was mounted on a thicker new canvas, in previous treatment. We applied the THz pulse-echo imaging to observe layer structure of the entire painting. Nondestructive cross section images easily show the interface between the original and new canvas layers, and multiple painted parts are also confirmed. However, the preparation layer and the painted layer which is obviously one brush stroke on the preparation, could not be distinguished from the original canvas due to the lack of resolution in depth direction. We discuss the potential and limitations of THz pulse-echo imaging for canvas painting investigations.

Conservation issues -2 : M. Menu
Authors : V. Detalle a*, D. Giovannacci a, D. Martos-Levif a, B. Trichereau a, D. Brissaud a, D. Syvilay a , E. Bourguignon a, B. Jackson b, J. Bowen b, M. Menu c
Affiliations : a Laboratoire de Recherche des Monuments Historiques, CNRS CRC USR3224, 29 rue de Paris, 77420 Champs-sur-Marne, France b School of system engineering, University of Reading, Whiteknigths RG4 6AY, Reading, UK c Centre de Recherche et de Restauration des Mus?es de France, Porte des lions, 14 quai Fran?ois Mitterrand 75001 Paris, France

Resume : Preservation of cultural heritage is one of the key parts of education for future generation. The development of new portable instrumentation allows people in charge of conservation to study and enhance the knowledge of this heritage. The need of in situ characterization is growing due to the feasibility of implementation of new technics. Portable terahertz time-domain imaging and spectroscopy has been evolving as an investigative tool in the field of cultural heritage for conservation applications [1-3]. In the field of cultural heritage, this technic was first used for imaging the hidden painting under lime wash layer. This technic allows getting good multilayer structural information. Portable Libs (Laser Induced Breakdown Spectroscopy) is well known as elemental technic. The first applications for cultural heritage were focused on pigment identification [4-7]. Moreover, the force of this kind of optical instrumentation is presented by its capability to provide in depth information. This work aims at coupling both technics in order to characterize as well as possible different kind of hidden surface without sampling focusing on the mural painting conservation issues. Mocks-up were prepared including different picture using several pigments. In addition, some area have been prepared with gold leaf and then recovered by lime wash layer. Thz imaging was applied in order to identify the different layers and the picture represented and libs to identify the nature of the material composing the sample. In addition the effect of cyclododecane to enhance the efficiency of the technics has been investigated and will be presented. [1] J. Bianca Jackson, John Bowen, Gillian Walker, Julien Labaune, Gerard Mourou, Michel Menu and Kaori Fukunaga, ?A Survey of Terahertz Applications in Cultural Heritage Conservation Science,? IEEE Transactions on Terahertz Science and Technology 1 (2011) 220-231 [2] J.B. Jackson, M. Mourou, J. F. Whitaker, I. Duling, S. Williamson, M. Menu and G. Mourou ?Terahertz Imaging for Non-destructive Evaluation of Mural Paintings,? Optics Communications 281 (2008) 527?532. [3] Gillian C. Walker, John W. Bowen, Julien Labaune, J-Bianca Jackson, Sillas Hadjiloucas, John Roberts, Gerard Mourou, and Michel Menu ?Terahertz deconvolution? Optics Express, 20 (2012), 27230-27241 [4] Bruder R., Detalle V., Coupry C. ?An example of the complementarity of laser-induced breakdown spectroscopy and Raman microscopy for wall painting pigments analysis?, Journal of Raman Spectroscopy, volume 38, issue 7, pp. 909 ? 915, (2007) [5] Bruder R, L'Hermite D, Semerok A, Salmon L, Detalle V. ? Near-crater discoloration of white lead in wall paintings during laser induced breakdown spectroscopy analysis?. Spectrochim. Acta Part B 62:1590-1596, (2007) [6] Duch?ne S, Detalle V, Bruder R, Sirven JB. ?Chemometrics and laser induced breakdown spectroscopy (LIBS) analyses for identification of wall paintings pigments?. Curr. Anal. Chem. 6:60-65, (2010) [7] Gregoire S, Boudinet M, Pelascini F, Surma F, Detalle V, Holl Y. ?LIBS (Laser Induced Breakdown Spectroscopy) for polymer identification? Analytical and bioanalytical Chemistry Volume 400, Number 10, 3331-3340 (2011)

Monitoring Risks & Building Materials : M. Angelini
Authors : I. Catapano*, G. Gennarelli and F. Soldovieri
Affiliations : Institute for Electromagnetic Sensing of the Environment (IREA), - National Research Council of Italy (CNR), Naples, Italy. (E-mail: {catapano.i, gennarelli.g, soldovieri.f}

Resume : Electromagnetic sensing technologies deserve huge attention in the frame of cultural heritage, since theyare able to provide information about constructive techniques, restoration works, preservation status and risk factors affecting the integrity of artworksin a non-invasive and safety way. Among the electromagnetic techniques currently at the state of art, we focus on subsurface radar as well as THz spectroscopy and imaging systemsand summarize the main advancements in terms of data processing and results achievedat the Institute forElectromagnetic Sensing of the Environment - National Research Council of Italy (IREA-CNR). Subsurface radar systems are widely considered in archaeology and cultural heritage monitoring due to their ability to attain high-resolution images of thehidden features of a surveyed spatial region in a non-invasive way, by exploiting the ability of the microwaves to penetrate inside opaque materials. However, despiteof the simple electromagnetic sensing mechanism, their use in operative conditions is not of immediate impact. This is mainly due to the fact that raw radar images suffer of “blurring” effects, which make their interpretation very difficult andprone to the operators’ expertise. Therefore, a continuous research effort is on-going so to addressthe development of advanced data processing strategies, with the final aim ofproviding easily interpretable images, possibly in real-time.In this frame, model based data processing approacheshave been developed at IREA-CNR. These approaches recast the imaging as a linear inversescattering problem and arecapable of providing robust and reliable diagnostics in terms of high-resolution 2D and 3D images, which allows us to infer thegeometrical features of hidden targets. These approaches have been extensivelytested in a large number of real test sites [1-3] and at the conferencecases of microwave tomography enhanced GPR surveys will be presented as well as their potentiality at tools to properly plan and timely address maintenance actionsof historical structures. THz spectroscopy and imaging systems are attracting huge attention as complementary techniques to classical analysis methodologies based on X-rays to mid infrared radiations. As microwaves, THz signals are, indeed, non-ionizing radiations capable of penetrating dielectric materials, which are opaque to both visible and infrared waves[4-6].In addition, several substances exhibit absorption spectra at THz frequencies with specific fingerprints, which depend on their molecular behaviour. Therefore, THz waves allows characterization of manmade objects, with the possibility of discriminating different materials while assuring negligible long term risks to the molecular stability of the exposed objects. As a further advantage, in the last years, flexible and compact commercial systems having source and detector probes coupled by means of optical fiber cables and that do not require complex optical alignments have been developed.An example of last generation THz systems is the Fiber-Coupled Terahertz Time Domain System (FICO) developed by Z-Omega and recently acquired by the Institute of Electromagnetic Sensing of the Environment (IREA).Such a system works in the range from 0.1THz to 3THz and is equipped by a 15 cm x 15 cm motorized platform to perform planar scans of the investigated samples. The experiments carried out at the IREA laboratory and the obtained results will be presented at the conference with the aim to discuss on the potentialities offered by THz technologies in the frame of artworks characterizations. Keywords:Cultural Heritage Monitoring, Imaging, Microwaves, THz waves [1] G. Leucci, R. Persico and F. Soldovieri. Detection of fractures from GPR data: the case history of theCathedral of Otranto. J. Geophys. Eng., vol.4, pp.452–461, Dec. 2007. [2] I. Catapano et al., “Microwave tomography enhanced GPR surveys in Centaur’s Domus, regio VI of Pompei, Italy”, J. Geophys. Eng, vol. 9, pp. 92-99, 2012. [3] I. Catapano et al. “Full three-dimensional imaging via ground penetrating radar: assessment in controlled conditions and on field for archaeological prospecting”, Applied Physics A 115 (4), pp.1415-1422, 2014. [4] K. Fukunaga, I. Hosako, “Innovative non-invasive analysis techniques for cultural heritage using terahertz technology”, C. R. Physique, vol. 11, pp.519–526, 2010. [5] M. Perenzoni and D. J. Paul, Physics and Applications of Terahertz Radiation, Springer Series in Optical Sciences 173, 2014

Authors : Rocío Ortiz, Pilar Ortiz, José María Martín, MªAuxiliadora Vázquez
Affiliations : Pablo de Olavide University, Department of Physical, Chemical and Natural Systems,Utrera Rd. Km 1, 41013 Seville, Spain; Pablo de Olavide University, Department of Physical, Chemical and Natural Systems,Utrera Rd. Km 1, 41013 Seville, Spain, e-mail:;Pablo de Olavide University, Department of Physical, Chemical and Natural Systems,Utrera Rd. Km 1, 41013 Seville, Spain; Seville University, Department of Crystallography, Mineralogy and Q.A., St. Profesor García González, S/N, Seville, 41072, Spain

Resume : The degradation of monuments could be mainly due to the effects caused by structural damages, weathering affection, pollution agents and anthropogenic factors. The conservation degree of each monument is the vulnerability, and its index is an indirect function of the level of deterioration risk . RIVUPH is a project of the Andalusian government based on the analysis of environmental risk in Historical cities in order to develop conservation strategies and policies. With this purpose Risk and Hazard maps of different towns are being built with GIS (geographic information systems) software. The aim of this research is the application of this methodology to the cases of different cities in Spain (Cadiz, Ronda and Seville). Each hazard has a given frequency and intensity in the historical cities according to their environmental conditions, these conditions change and depend on the location, for this reason a GIS software is being developed (Art-Risk). This new approach is based on the comparison and overlapping of values obtained using a Delphi methodology. Simultaneously, the vulnerability analysis is studied to assess the monuments conservation degree using a pre-artificial intelligence tool. The final risk map is the results of the main hazards maps and the vulnerability analysis. Analysing the risks maps is a very useful tool to identify, evaluate and prioritize the restoration of Cultural Heritage and the budgets of the monuments from a city or inside a region and to forecast the preventive conservation policies. AKNOWLEDGEMENT This Project has been carried out thanks to the funds of the Junta of Andalusia Project RIVUPH (HUM 6775).

Authors : M. Amenta (a), I. Karatasios (b), N.Maravelaki (c), V. Kilikoglou (d)
Affiliations : a,b,d : Institute of Nanoscience and Nanotechnology, N.C.S.R. Demokritos, Athens, Greece c : Laboratory of Analytical and Environmental Chemistry, Technical University of Crete, Chania, Greece

Resume : Mortars are known for their ability to heal their defects in an autogenic way. This phenomenon is expressed by the filling of micro-cracks by secondary products, restoring or enhancing the material’s performance. The reactions that take place inside the cracks can be either carbonation or hydration, producing secondary calcite or hydraulic phases respectively. Overall, the “healing” potential of a cementitious material is largely governed by the binder composition, as well as the morphology, chemistry and mineralogy of the healing products. As it is an autogenic phenomenon, the main interest lies in a deeper understanding of its mechanism, along with the parameters that may promote or hinder it. Parameterization of self-healing phenomenon could be a key factor for the enhanced sustainability of these materials in terms of reduced repair cost and consumption of natural raw materials and thus reduced environmental fingerprint. The fact that this phenomenon takes place autogenously suggests that there are reduced repair requirements, as the material can self-repair its defects without external intervention, thus leading to a prolonged life-cycle. In the present study the autogenic self healing phenomenon was studied in lime-pozzolan and natural hydraulic (NHL) mortars, considering aspects of binder composition, curing time before initial cracking, duration and conditions of the healing period. In order to parameterize the phenomenon, prismatic specimens of both compositions were cracked after 15 and 30 days of curing and were then examined after another 30 or 90 days of curing at different environmental conditions(45, 75, 95 RH %) or after continuous wet-dry cycles. The identification of the secondary formed products was carried out on thin-sections and fractured surfaces, in Petrographic and Scanning Electron Microscope equipped with Energy Dispersive X-rays Analyser (SEM/EDAX), based on their optical properties, micro-morphology and chemical composition of the new phases. Additionally, in order to study the potential strength recovery of mortars under the same conditions, controlled cracking of prismatic specimens was induced by Hertzian test after 15 and 30 days of curing whereas, residual strength was measured after one month of healing by three-point bending test. Furthermore, thermo-gravimetric analysis (DTA/TG) was performed in all specimens in order to quantitatively assess the available unreacted components in the binder at all ages. Regarding the microstructure of the healing phases, the main products formed during healing consist of calcite, aragonite and various C-S-H/ C-A-H phases. Depending on the parameters mentioned above, there is wide diversity in the intensity, typology and topography of the secondary phases inside the cracks. The main differences discussed, were observed between specimens cracked at very early age (7 days) and those damaged after 30 days of curing. Similarly, the mechanical properties of the crack-healed specimens were associated with the above findings and especially with the available each-time amount of lime, determined by thermo-gravimetric analysis. The later was found to be related to the formation of carbonate or hydraulic phases within the effects of mortar specimens. Considering the enviromental setup, the higher regain of strength was witnessed in specimens cured under high humidity conditions, and those damaged at earlier age. The elaboration of the results suggests that the parametric modification of the chemical composition of modern repair mortars associated with the microclimatic conditions of CH monuments can initiate the self-healing mechanism and thus, lead to an enhanced service-life and sustainability of conservation materials.

Authors : Giovanni Predieri1, Ilaria Alfieri1, Laura Bergamonti2, Andrea Lorenzi1,Federica Bondioli2, Pier Paolo Lottici3
Affiliations : 1Department of Chemistry, University of Parma, Parco Area delleScienze 17/A, 43124 Parma 2Department of Industrial Engineering, University of Parma, Parco Area delleScienze, 181/A, 43124 Parma, Italy 3 Physics and Earth Sciences Department, University of Parma, Parco Area delleScienze 7/A, 43124 Parma, Italy

Resume : During the last century the increasing environmental pollution in synergistic action with the natural weathering agents, has caused a rapid worsening of the conditions of the monuments exposed in urban areas. The main forms of deterioration on the stone facades are related to the accumulation of pollutants and to soiling processes, with the development of black crusts and other decay forms. Photocatalysis is an oxidation process that can be used for the decomposition of various environmental pollutants in both gaseous and liquid phases in a simple and efficient way.Among the photocatalytic materials, titanium dioxide is the most widely studied andthe photoactive nanocrystalline titania obtained by sol-gel process is a promising de-soiling coating material. In this paper we report on the results of a study on a new self-cleaning coating for carbonaticstones based on TiO2 nanoparticles obtained by sol-gel in a basic environment. Different types of limestone amongthe most frequently used in historic buildings were used as substrates. The water based TiO2sol was easily applied by brushing directly on the stone. The compatibility of the coatings with the substrate was examined according to the UNI-Normal protocols by measuring the water absorption by capillarity and colorimetric parameters. The characterization of the powders obtained by drying the sol at room temperature was made by -Raman spectroscopy and XRD. The penetration depth and surface distribution of the sol were evaluated with SEM-EDS. Photocatalytic oxidation of methyl orange (MeO) and methylene blue (MB) under fluorescent lamp irradiation (= 366 nm) was used as indicator of the catalytic activity of nano-TiO2 sol and TiO2coatings. XRD and Raman measurements confirm the crystalline nature of titaniain anatase form with negligible brookite. The Raman peak positions and FWHM suggest anatase nanocrystals with 5-10 nm size. SEM-EDS shows a penetration depth of a few microns and surface distribution fairly homogeneous.A fast photocatalytic activity was measured for both TiO2sol and coatings. The self-cleaning TiO2-based basic treatment does not introduce colorimetric changes compared to the untreated limestone and does not alter the properties of the stone as determined by measurements of the water capillarity absorption The basic nanocrystalline TiO2 by sol-gel processes is an easy way to obtain photocatalytic de-soiling coatings without modifying the morphology and the chemical-physical properties of limestone and ispromisingfor applications in the field of cultural heritage. Support from MAECI (project “NANO4HER, Nanotechnology at the service of cultural heritage preservation”, Italy-Israel Scientific and Technological Cooperation) is gratefully acknowledged.

Authors : Enrico GRECO*, Enrico CILIBERTO*, Pietro Damiano VERDURA*, Elio LO GIUDICE **, Giuseppe NAVARRA **
Affiliations : * Università degli Studi di Catania – viale A. Doria 6, 95125, Catania, Italy; ** DISMAT srl – c.da Andolina SS 122, km 28, 92024 Canicattì, Italy;

Resume : A concrete is an inorganic system where amorphous silica and iron oxides react with calcium hydroxide through pozzolanic reactions that yield calcium silicates, calcium ferrites and other hydraulic phases. The rate of the pozzolanic reactions is proportional to the amount of surface area of the chemical species involved in the reactions. In order to enhance these reactions that are so important in developing the final properties of a concrete we followed the route of adding SiO2 and Fe2O3 nano-particles to the cement pastes in order to produce high performance systems. With the aim of studying the effects of the addition of nanoparticles on the behaviour of concrete and mortars, the replacement levels of cement by the solid content of the nanosilicas were 4%. The compressive strengths, tensile splitting, propagations of ultrasonic pulses, water permeability tests were investigates on different models and realistic structures by ISO EN rules. The influence of the nanoparticles on physical and mechanical properties were measured at different ripening times. Both silica and iron oxides make cement pastes harder and accelerated hydration processes of the cements themselves. A remarkable decreasing of water permeability was also observed showing that nano-concretes can be used as innovative restoration systems for cement based historical and contemporary artefacts in order to avoid carbonation processes. Moreover, a smaller quantity of cement binder inside the mortar causes relevant positive effects on the reduction of carbon dioxide emission in the atmosphere. Keywords: nanosilicas, nanoferrites, CO2 reduction, nano-addictives Altavilla, C., Ciliberto, E., 2011. Inorganic nanoparticles: Synthesis, applications, and perspectives.,CRC Press, New York Arulraj P. G., Carmichael J. M., 2011, Effect of NanoFlyash on Strength of Concrete, International Journal of Civil and Structural Engineering Vol. 2, No 2, 2011 Asuha S., Zhao S., Wu H. Y., Song L., Tegus O., 2008, One step synthesis of maghemite nanoparticles by direct thermal decomposition of Fe–urea complex and their properties. Journal of Alloys and Compounds 472, 2009, pp.123–125. Green D. L., Lin J. S., Lam Yui-Fai, Hu M.Z.-C., Schaefer Dale W., Harris M.T., 2003, Size, volume fraction and nucleation of Stober silica nanoparticles. Journal of Colloid and Interface Science 266, 2003, pp. 346-358. Jo B., Kim C., Tae G., Park J., 2007, Characteristics of Cement Mortar with Nano-SiO2 Particles. Construction and Building Materials, 21, 6, pp. 1351-1355.

Authors : W. Anaf,a A.E. Meteke,a F. Vanmeert,a K. De Wael,a K. Janssensa, M. Vermeulen,b J. Sanyova,b H. Calvo del Castillo,c D. Strivayc
Affiliations : a AXES Research Group, Department of Chemistry, University of Antwerp, Belgium b Polychromy Laboratory, Royal Institute for Cultural Heritage KIK-IRPA, Brussels, Belgium c European Centre for Archaeometry, University of Liège, Belgium

Resume : We have investigated the degrading effects of various fine salt particles when deposited on the surface of artefacts painted with oil-based paints. Soiling/blackening of and deposition of inorganic, water-soluble aerosol components on the surfaces were considered. Atmospheric total suspended particulate (TSP) was actively and passively sampled by means of deployed horizontal and vertical filters in various rooms of four Belgian cultural heritage buildings, installed with various heating/ventilation systems. The inorganic composition of the deposited water-soluble TSP was quantitatively determined by means of ion chromatography. On horizontal surfaces, significantly higher chloride deposition was observed compared to vertical surfaces. Next to NaCl and NH4Cl, also the effect of the salts NaNO3/NH4NO3 and of Na2SO4/ (NH4)2SO4 was investigated. A number of model paint samples [containing inorganic pigments such as mercury sulphide (HgS, red), minium (Pb3O4, orange-red), cadmium sulphide (CdS, yellow), lead chromate (PbCrO4, yellow) and lead white (2PbCO3.Pb(OH)2, white)] were finely sprayed with solutions of these salts and dried to induce the precipitation of small salt particulates at the paint surface. These surface were artificially aged by UV irradiation in a moist environment. Near the salt crystals, combined SEM, Raman and XANES investigations revealed a more prominent alteration and local color change to have taken place at the surface of the semi-conductor pigments. Electrochemical studies, μ-XANES and μ-XRD measurements also allowed to identify some of the alteration reactions taking place. In general, since even seemingly innocuous hygroscopic salts such as NaCl can stimulate the chemical alteration of the paint surface, it appears recommended to employ state-of-the-art ventilation/air-conditions systems including facilities for trapping/filtering of (hygroscopic) fine dust particles in art galleries and musea to ensure the durable conservation of works of art.

Authors : Anne Bouquillon
Affiliations : C2RMF, Paris, France

Resume : -

Authors : M.L. Coutinho 1,2,3, L.C. Alves 4, V. S. Muralha 3, J.P. Veiga 5, J. Mirão 6, L. Dias 6, A.M. Lima 2,3, M. F Macedo 3
Affiliations : 1 REQUIMTE-CQFB - Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica, Portugal, 2 Departamento de Conservação e Restauro, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica, Portugal 3 VICARTE, Centro do Vidro e da Cerâmica para as Artes, FCT-UNL, Quinta da Torre, 2829-516 Caparica, Portugal 4 Campus Tecnológico e Nuclear, CTN, Campus de Loures do IST/UL, Estrada Nacional 10 (ao km 139.7), 2695-066 Bobadela LRS, Portugal 5 CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal 6 Laboratório HÉRCULES, Universidade de Évora, Largo Marquês de Marialva 8, 7000-554 Évora, Portugal

Resume : The glaze and in-glaze pigments of the historic nineteenth century glazed tiles from the Pena National Palace (Sintra, Portugal) were characterized using a multi-analytical approach. Chemical composition and structural characterization were ascertained by µ-PIXE, µ-Raman, Optical Microscopy and VP-SEM. The production technique and colour palette in these tiles were found to be close to the ceramic pigments used in traditional majolica. The blue and purple colours derive respectively from cobalt oxide and manganese oxide. A mixture of Naples yellow with cobalt oxide and iron oxide were used for green and dark yellow respectively while grey tonalities consist of a complex mixture of cobalt oxide, manganese oxide and Naples yellow in different proportions. Results obtained allowed for the assessment of the nature of the pigments used as well as production techniques, resorting to traditional majolica manufacture although the tiles were produced by the end of the 19th century.

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Authors : J.S. Pozo-Antonio(1), M.P. Fiorucci(1), A. Ramil(1), A.J. López(1), T. Rivas(2), D. Barral(2)
Affiliations : (1) Laboratorio de Aplicacións Industriais do Láser, Centro de Investigacións Tecnolóxicas (CIT), Departamento de Enxeñaría Industrial II, Escola Politécnica Superior, Universidade de Coruña, Campus Ferrol, 15403 Ferrol, Spain. (2). Departamento de Enxeñaría dos Recursos Naturais e Medioambiente, Escola Superior de Minas, Universidade de Vigo, 36310 Vigo, Spain.

Resume : The aim of this paper is to analyze the suitability of artificial neural networks to identify the different rock-forming minerals of hercynian granites from hyperspectral data. These granites are the most used rocks in the monuments of Architectural and Artistic Heritage in NW Spain. Granites consist of mineral grains with different chemical and physical properties. Therefore, in laser cleaning campaigns these minerals exhibit different behavior under the action beam which can result in undesirable damage such as the melting of biotite grains or the fracture of quartz crystals due to laser overexposure. The automatic control of the cleaning process requires the rapid and reliable identification of the minerals in the surface area to be irradiated. In order to achieve this purpose, a hyperspectral camera was used and an ANN algorithm which works with the collected spectra of the granite surface was designed. The efficiency in the correct identification of the different granite-forming mineral grains, i.e. quartz, feldspars, plagioclase and biotite was evaluated and a high degree of success was achieved. Keywords: Artificial Neural Networks, granite, hyperspectral technique, mineral identification, forming mineral, Cultural heritage.

Authors : J.S. Pozo-Antonio(1), M.P. Fiorucci(1), T. Rivas(2), A.J. López(1), A. Ramil(1), D. Barral(2)
Affiliations : (1) Laboratorio de Aplicacións Industriais do Láser, Centro de Investigacións Tecnolóxicas (CIT), Departamento de Enxeñaría Industrial II, Escola Politécnica Superior, Universidade de Coruña, Campus Ferrol, 15403 Ferrol, Spain; (2) Departamento de Enxeñaría dos Recursos Naturais e Medioambiente, Escola Superior de Minas, Universidade de Vigo, 36310 Vigo, Spain.

Resume : The aim of this paper leads to the evaluation by means hyperspectral techniques of the effectiveness of the laser cleaning of a complex biogenic patina composed of lichens. Samples of a hercynian granite from NW of Spain colonized by an endolithic crustose lichen were collected and cleaned using the third harmonic of a Nd:YVO4 nanosecond laser. In addition, the effectiveness of the laser cleaning in terms of the patina extraction rate and of the damage caused on the surface was evaluated by means of a hyperspectral camera. The suitability of this non-destructive, on-line, fast and in situ monitoring technique in order to evaluate the effectiveness of the cleaning was assessed using optic microscopy, Scanning Electron Microcopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier Transform Infrared Spectroscopy (FTIR) and color measurements in CIELab space. These techniques were found very powerful for estimating the degree of cleaning, through the detection of traces of organic matter and the damage in granite minerals, allowing us to detect the melting in biotite or the fractures in the quartz. However they are destructive techniques and make the evaluation process longer and discontinuous. Therefore, the hyperspectral technique resulted an advantageous method to assess the effectiveness of the laser cleaning of granites in comparison with conventional techniques. Keywords: Granite, laser Nd:YVO4, lichenic patina, stone cleaning, hyperspectral technique.

Authors : M.Auxiliadora Gómez-Morón, Jose María Martín, Pilar Ortiz, Rocío Ortiz, M.Paz Mateo, Ginés Nicolás
Affiliations : Instituto Andaluz de Patrimonio Histórico (IAPH) Isla de la Cartuja, Camino de los Descubrimientos S/N, 41092, Seville, Spain; University Pablo de Olavide, Dpt.Physical, Chemical and Natural Systems, Utrera Rd. Km 1, 41013 Seville, Spain; Universidad de A Coruña, Laboratorio de Aplicaciones Láser. C/ Mendizábal s/n, 15403 Ferrol , Spain

Resume : The aim of this research was the application of Laser-Induced Breakdown Spectroscopy (LIBS) to the study of different silver pieces in order to assess the techniques used for its manufacturing. LIBS depth profiles is able to identify the presence of a micron silver layer over an alloy of copper and zinc (Ruolz technique), corrosion products, alloy missing and restorations with copper layers. These results are consistent with those obtained by scanning electron microscopy with energy dispersive of X-ray (SEM-EDX) with the advantage that LIBS is a methodology that allows to analyse metal pieces without sampling neither preparation. ACKNOWLEDGEMENTS This study has been partially supported by the agreements IAPH&UPO and the Excellence Project of Junta de Andalucia HUM-6775 (RIVUPH).

Authors : Federica Bondioli(1), Silvia Alinovi(2), Andrea Lorenzi(2), Ilaria Alfieri(2), Laura Bergamonti(1), Giovanni Predieri(2), Danilo Bersani(3), Pier Paolo Lottici(3)
Affiliations : (1) Industrial Engineering Department, University of Parma, Parco Area delle Scienze 181/A, 40124 Parma (Italy) (2) Chemistry Department, University of Parma, Parco Area delle Scienze 17/A, 40124 Parma (Italy) (3) Physics and Earth Sciences Department, University of Parma, Parco Area delle Scienze 7/A, 40124 Parma (Italy)

Resume : Recently, organic–inorganic hybrid materials have been extensively studied, as they could exhibit bet- ter mechanical, thermal, optical, and electronic properties, compared with the corresponding pure organic or inorganic aystems. The properties of hybrid materials could be tuned through the func- tionality or segment size of each component Poly(methyl methacrylate) (PMMA) is an impor- tant thermoplastic material with excellent transpar- ency. However, its poor thermal stability restrains it from applications in higher temperature region. One possible solution to address the above problem is to hybridize with inorganic oxides such as silica or tita- nia. The sol–gel technique is often used to produce hybrid materials [1]. Inorganic-organic hybrid systems made ofpolymethylmethacrylate (PMMA) addedwithan inorganic filler based on SiO2 and ZrO2have beensynthesized, characterized and tested as coatings for the protection of sandstones, of interest for cultural heritage. PMMA was dissolved in a mixture of two accurately chosen solvents, methylethylketone(MEK) and 2,2-dimethyl-4-hydroxymethyl-1,3-dioxolane(Augeo SL 191).Tetraethylorthosilicate (TEOS) and zirconyl chloride (ZrOCl2•8H2O)were added in different ratiosasinorganic precursors. The materials obtained by the sol-gel process werecharacterized by XRD, FTIR-ATR andµ-Raman spectroscopy.The coatings were tested on two sandstone species from Tuscany (Italy): Pietra Doratafrom Manciano andPietra Serena (litarenite Arcosica) fromFirenzuola. Water absorption by total immersion and by capillarity, contact angle and color parameters of surfaces were determined, before and after the application of the synthesized coatings. The results on the water absorption and on the contact angle indicate,for both treated sandstones, an improvement of water repellency. The total color differenceintroduced by the coatings is acceptable, withoutevident modifications of the aestheticappearance. [1] H.-C. Kuan, S.-L. Chiu, C.-H. Chen, C.-F. Kuan, C.-L. Chiang, J. Appl. Pol. Sci. 2009, 113, 1959-1965.

Authors : M.Vermeulen* and J. Sanyova
Affiliations : Laboratory, Royal Institute for Cultural Heritage, Parc du Cinquantenaire 1, 1000 Brussels, Belgium

Resume : Arsenic sulfide pigments, commonly referred as orpiment and realgar, have been used worldwide from antiquity until the 19th-century1,2,3. Throughout the time it was in use, many names have been used to designate arsenic sulfide pigments. For examples, orpin, yellow realgar, King’s yellow, arsenicon, seki have been used for the orpiment while red orpiment, sandaraque, orpin or burnt orpiment were used for the realgar1,4,5. This multiple terminology makes its description and history of use rather complex. In addition to the multiple terminology, many manuscripts mention, alongside the natural crystalline pigments, artificial forms made from alchemy6,7. Nevertheless, this artificial form of the pigment has been mostly overlooked during the photo-degradation studies of the arsenic sulfide group pigments realized until now8,9,10. The quick distinction between the naturally occurring pigment and the synthetic ones was made possible by the development of accessible techniques such as Raman spectroscopy. Investigation of arsenic sulfide particles showed in some cases that artificial arsenic sulfide is uncounted more often than one would think, even though they are not very often found in European easel paintings, maybe due to their high toxicity, price and problematic behaviors toward other pigments, especially the copper- and lead-containing ones. Nonetheless, it has been encountered in polychrome artworks in 13th to early 20th-century European and Asian works of art2. For example, it has been unveiled in 18th-century “chinoiserie”, 18th-century baroque polychrome wooden sculptures or, in higher amount in the late 19th-early 20th-century decorative panels of the Japanese pagoda from the Royal Domain in Laeken, Brussels, Belgium. In all of these artifacts, the arsenic sulfide pigments appear to be in a very good conservation state. This led us to wonder about the stability of artificial arsenic sulfide pigments. But, to study and understand the stability of artificial arsenic sulfide pigments, it is crucial to know its exact nature and composition. In that regard, we interpreted ancient recipes found in manuscripts in order to synthetized the different forms of the pigment starting with different materials. This led to pigments with various purities and characteristics which could lean toward different stabilities. This research represents the first part of an in depth degradation study of arsenic sulfide pigments aiming for a comparative study of natural and artificial arsenic sulfide pigments and the influence of the binding medium in which it is used on the degradation processes.

Authors : MahaAhmed Ali 1,Enrico Ciliberto 2, Mona Fouad Ali 1, Enrico Greco 2*, Domenico Mello 3, Ezio Viscuso2
Affiliations : 1 Conservation Department, Faculty of Archaeology, Cairo University, El-Gamaa St., 12613, Giza, Egypt, 2 Department of Chemical Sciences, University of Catania, viale A. Doria 6, 95125, Catania, Italy,* 3ST Microelectronics, Strada Primosole 50, 95121 Catania, Italy

Resume : A major objective of all conservation treatments is to increase the physical and chemical stability of the objects being treated. Given that photographic gelatin emulsions are highly susceptible to different forms of damage such as flaking, cracking, and powdering; consolidation treatments often forms an important part of the stabilization process. The application of nanomaterials is a new approach in photograph conservation, which will hopefully enable the control of the properties of traditional consolidants thus improving their performance. In this study, gelatin nanoparticles and nanolayers were prepared and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS)for testing on damaged gelatin emulsion. Thenanolayers were prepared by a two-stepdesolvation method, in order to obtain gelatin nanoparticles, followed by a third step involving rapid solvent evaporation.The prepared particles were found to have a spherical shape with sizes varying from 33 nm to 216 nm and a mean size of 42 nm depending on the conditions of synthesis. This research showed that both pH and temperature are very effective on particle size. Further studies are being planned to evaluatethe benefits and potential problems ofin-situ consolidation of damaged gelatin emulsion using gelatin nanolayer technique. Keywords: Gelatin, nanoparticles, pH, temperature,scanning electron microscopy, transmission electron microscopy, dynamic light scattering * Endnotes This research is a part of Project SACPP No:61-12-A2 (A scientific approach to the conservation of printed photos)-Scientific and Technological Cooperation between Arab Republic of Egypt and Italian RepublicMAECI (Project ‘La conservazione degli archivi fotografici: un approccio scientifico’)

Authors : Donatella Capitani2, Enrico Ciliberto 1, Antonio M.E. Cirino1,Valeria Di Tullio2, Enrico Greco 1
Affiliations : 1Department of Chemical Sciences, University of Catania, viale A. Doria 6, 95125, Catania, Italy, 2CNR-IMC via Salaria km. 29.500, 00015 Monterotondo, Roma, Italy

Resume : The use of nanotechnology in conservation is a relatively new concept. Usually, classical clean-up methods take into account the use of other chemicals: from one hand they help the environment destroying pollutants, but from the other they often become new pollutants. Among the new oxidation methods called Advanced Oxidation Processes (AOP), heterogeneous photocatalysis has appeared an emerging technology with several economic and environmental advantages. A new sol-gel method of synthesis of TiO2-anatase is reported in this work using Lithium and Cobalt (II) salts. The activation energy of the doped-photocatalyst was analyzed by solid-state UV-Vis spectrophotometer. The mobility of Li-ions on TiO2 NPs surface were characterized by 7Li solid-state NMR spectroscopy and 7Li NMR relaxation measurements. Also X-ray photoelectron spectroscopy (XPS) were done. Use of doped-nanotitania is suggested from authors for the removal of pollutants in confined areas containing goods that must be preserved from decomposition and ageing phenomena Keywords: Anatase, TiO2, photocatalysis, solid-state NMR, solid-state UV-Vis Altavilla, C., Ciliberto, E., 2011. Inorganic nanoparticles: Synthesis, applications, and perspectives.,CRC Press, New York Wouter J. H. Borghols,Dirk Lützenkirchen-Hecht,UllrichHaake, Wingkee Chan, Ugo Lafont, Erik M. Kelder,d Ernst R. H. van Eck,Arno P. M. Kentgens, Fokko M. Mulder, and MarnixWagemakera,Lithium storage in amorphous TIO2 nanoparticles: Journal of electrochemical society, 157 (5) (2010) I. Hung, Z. Gan, On the practical aspects of ecordingwideline QCPMG NMR spectra,Journal of Magnetic Resonance, 204 (2010) 256-265

Authors : D.Ferro (a), D. Loepp (b), D. Servidio (c), L. Cerri (a), M. Brucale (a) and G. Padeletti (a)
Affiliations : a) CNR-ISMN, Rome, Italy b) ExperimentalArcheology, Via dei barbieri 42, Rome, Italy c) Sapienza University, Rome, Italy

Resume : The aim of this work is to provide a better understanding of the chemical reactions involved in the formation of the patina on shakudo, the peculiarity of its colourand to attempt to develop a method with ascientific basis for its study and recognition. Different recipes for shakudo realization have been reviewed, choosing one for its historical coherence and proven efficacy and using it for the coloring of both a pure copper sheet and a Cu alloy containingsmall amount of gold, in order to compare the different features of the pure metal and the alloy. The patinas were then analyzed with EDXD and XRD to identify the surface chemical composition; the structure of the metal was observed with SEM-EDS and Atomic Force Microscopy (AFM) to identify any morphological changes that may contribute to the surface characteristic hues. A chemical mechanism for the formation of the patina is proposed. Keywords: surface treatments, shakudo, patina, Japanese alloys

Authors : G. Cappelletti(a) , P. Fermo(a), L. Cerri(b), S. Kaciulis(b), G. Padeletti(b)
Affiliations : (a) Dipartimento di Chimica, Università di Milano, Via Golgi 19, Milano (b) Istituto per lo Studio dei Materiali Nanostrutturati – CNR. cp 10. 00016 MonterotondoStaz., Roma, Italy

Resume : The protection of historical monuments is an issue of great interest andthe application of polymers as surface treatments is a quite common practice since these coatings form a protective layer on the surface as well as are able to prevent the salts migration from the surface to the stone. Marbles commonly employed in architecture (Carrara, Candoglia, Botticino and Angera) have been treated with both commercial water-repellent protective agents (siloxanes) and new formulated coatings obtained by mixings resins with TiO2 nanoparticles. By means of contact angle measurements the hydrophobic behavior of the treated surfaces has been evidenced. By photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) some specific characteristics of the treated marbles have been evidenced. In particular the homogeneity of the coatings has been highlighted by XPS while AFM allowed to disclose the presence of micro and nanoparticles on the coated surfaces. The color of the coated samples has been evaluated by CIE-Lab colorimetric analyses.Not significant color variations ( i.e. ΔE* < 5) were registered.

Authors : E. Angelini(1), S. Grassini(1), S. Corbellini(2), M. Parvis(2), F. Zucchi(3)
Affiliations : (1) Department of Applied Science and Technology, Politecnico di Torino, Italy (2) Department of Electronics and Telecommunications, Politecnico di Torino, Italy (3) Corrosion Study Center “A. Daccò”, Technehub, Università di Ferrara, Italy

Resume : Conservation and sustainable management of outdoor metallic cultural heritage assets is a complex issue because of the high variety of the materials employed to realize complex-shaped structures and of the climate and environmental changes due to industrialization, such as the increase of air pollutants in the atmosphere. Non-invasive approaches for monitoringthe assets stability by means of in situ measurements are, therefore, important tools to be designed and improved in the next future in order to ensure the long-term sustainable management of outdoor metallic cultural heritage.These approaches have also to be based on simple easy to use and low cost arrangements in order to really wide spread theirapplication in the cultural heritage field. Among the different techniques extensively used for corrosion inspection and monitoring of metallic artefacts, electrochemical impedance spectroscopy (EIS) presents several important advantages. Firstly,EIS is an accurate, sensitive and non-destructive technique for monitoring the protective effectiveness of corrosion product layers and protective coatings, without the need of sampling the artefacts and without accelerating their degradation. Moreover, EISmonitoring campaigns can be easily repeated in different periods to evaluate the conservation state evolution and to highlight the need of restoration. Many different complete EIS systems are nowadays commercially available, which exhibit excellent performance, but are either to be used in a laboratory or have design, dimension and cost that impair their use. In this study, a new complete solution which is based on a low cost EIS system coupled with specially crafted electrodes has been used to investigate the corrosion behaviour of weathering steel assets exposed outdoor in different cities in Italy. The EIS measurement system is based on a low-cost Arduino Due board coupled with a'shield' that hostsa logarithmic amplifier,whichextends the measurement capability to impedances in the range of 100 to 1G and for a frequency range of 0.01Hz to 100kHz. Two ABS electrode types, one designed to measure on quasi-horizontal surfaces and another for vertical and quasi-vertical surfaces, have been designed and realized by means of a 3D printer. The entire systemcan be powered directly by a portable personal computer so that measurements can be performed also in the absence of power supply. The measuring campaigns in progress and the previous results obtained, put in evidencethat the proposed solution represents an interesting new tool for the assessment of the conservation stateof metallic assets, allowing the monitoring of the atmospheric corrosion evolution as a function of the exposure to the different environments.


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Symposium organizers
Tom LearnerThe Getty Conservation Institute

1200 Getty Center Drive, Suite 700 Los Angeles, CA 90049-1684 USA
Michel MenuChef du Département Recherche

C2RMF, Palais du Louvre Porte des Lions 75001 Paris France
Giuseppina PadelettiCNR ISMN

Area Ricerca Roma 1 Via Salaria Km 29,5 00016 Monterotondo (Rome) Italy
Masahiko TsukadaDepartment of Scientific Research

The Metropolitan Museum of Art 1000 Fifth Avenue New York 10028 USA
João Pedro VeigaCENIMAT/I3N / Departamento de Ciência dos Materiais / FCT-UNL

Campus de Caparica 2829-516 Caparica Portugal