Jūratė Senvaitienė: PhD degree at the Vilnius University, Faculty of Chemistry (2006), Lithuania. Deputy director of Lithuanian Art Museum, Head of Pranas Gudynas Restoration Centre
Abstract A simple sol-gel technique for the preparation of methyl–modified silica coatings for th... more Abstract A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
In this study, the red iron paints used in ancient manuscripts for rubrics and miniatures were fa... more In this study, the red iron paints used in ancient manuscripts for rubrics and miniatures were fabricated and investigated. The commercial three different iron pigments (red ochre (Fe2O3), red bolus (Fe2O3.xSiO2.yAl2O3), and hematite (Fe2O3)) and three binding media (gum Arabic, fish glue and parchment glue) were used for the preparation of analogous to historical red iron paints. The obtained model red iron paints were analyzed with the aim to create a short data library which could be used for the characterization of different model compositions of red paints as well as real historical and archaeological red paints. The obtained red paints and binding media were characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD) analysis and thermal (TG/DSC) analysis techniques. The accelerated aging test was also applied for the analogous to historical red iron paints...
The influence ofcarboxylate-alumoxane protective coatings on the condition of writing paper inked... more The influence ofcarboxylate-alumoxane protective coatings on the condition of writing paper inked with iron and copper gall inks has been investigated. All paper samples used in this study were coated with hexanato-alumoxane at room temperature changing the soaking time from 1 to 8 h. The influence of deconservation parameters (duration and temperature) on the stability of inks was also studied. Paper samples (untreated, coated and after deconservation) were examined by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). Analytical characterization of paper samples showed no degradation of its cellulosic substrate during conservation. However, the destructive effect ofalumoxane on the writing iron gall inks was determined.
Abstract In the present study, SiO 2 coatings are presented as an alternative to the traditional ... more Abstract In the present study, SiO 2 coatings are presented as an alternative to the traditional ones, used in conservation of metals. The preparation of methyl–modified nanosilica coatings by the sol–gel technique to protect the external surface of copper alloys is discussed herein. The methyl–modified silica sols were obtained by mixing of 3% SiO 2 sol solution with hexamethyldisilozane (HMDS). The surface of brass and bronze specimens was coated by dip-coating technique. The structural features of the coatings were evaluated by FTIR spectroscopy. The hydrophobicity of the surfaces was investigated by contact angle measurements. The surface morphology changes of bare and coated specimens prior and after photochemical ageing were evaluated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
The artwork illumination requires special lighting to prevent a photochemical damage. Reflectance... more The artwork illumination requires special lighting to prevent a photochemical damage. Reflectance spectrums were measured of the UV-degraded 25 watercolour pigments and an optimal solid-state light source was modelled for this specific colour set.
Data Revues 12962074 Unassign S1296207413001532, Oct 7, 2013
ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for th... more ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for th... more ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt n... more In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.
In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt n... more In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.
In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt n... more In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.
... Figure 11. XRD patterns of fired at 1000 °C different glazes: sam-ple 2 (a), sample 3 (b), sa... more ... Figure 11. XRD patterns of fired at 1000 °C different glazes: sam-ple 2 (a), sample 3 (b), sample 4 (c), and sample 6 (d). Page 6. 190 Acta Chim. Slov. ... PM Rice, Pottery Analysis A Sourcebook, University of Chicago Press, Chicago, 1987. 22. MA Legodi, D. de Waal, Cryst. Eng. ...
Abstract A simple sol-gel technique for the preparation of methyl–modified silica coatings for th... more Abstract A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
In this study, the red iron paints used in ancient manuscripts for rubrics and miniatures were fa... more In this study, the red iron paints used in ancient manuscripts for rubrics and miniatures were fabricated and investigated. The commercial three different iron pigments (red ochre (Fe2O3), red bolus (Fe2O3.xSiO2.yAl2O3), and hematite (Fe2O3)) and three binding media (gum Arabic, fish glue and parchment glue) were used for the preparation of analogous to historical red iron paints. The obtained model red iron paints were analyzed with the aim to create a short data library which could be used for the characterization of different model compositions of red paints as well as real historical and archaeological red paints. The obtained red paints and binding media were characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD) analysis and thermal (TG/DSC) analysis techniques. The accelerated aging test was also applied for the analogous to historical red iron paints...
The influence ofcarboxylate-alumoxane protective coatings on the condition of writing paper inked... more The influence ofcarboxylate-alumoxane protective coatings on the condition of writing paper inked with iron and copper gall inks has been investigated. All paper samples used in this study were coated with hexanato-alumoxane at room temperature changing the soaking time from 1 to 8 h. The influence of deconservation parameters (duration and temperature) on the stability of inks was also studied. Paper samples (untreated, coated and after deconservation) were examined by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). Analytical characterization of paper samples showed no degradation of its cellulosic substrate during conservation. However, the destructive effect ofalumoxane on the writing iron gall inks was determined.
Abstract In the present study, SiO 2 coatings are presented as an alternative to the traditional ... more Abstract In the present study, SiO 2 coatings are presented as an alternative to the traditional ones, used in conservation of metals. The preparation of methyl–modified nanosilica coatings by the sol–gel technique to protect the external surface of copper alloys is discussed herein. The methyl–modified silica sols were obtained by mixing of 3% SiO 2 sol solution with hexamethyldisilozane (HMDS). The surface of brass and bronze specimens was coated by dip-coating technique. The structural features of the coatings were evaluated by FTIR spectroscopy. The hydrophobicity of the surfaces was investigated by contact angle measurements. The surface morphology changes of bare and coated specimens prior and after photochemical ageing were evaluated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
The artwork illumination requires special lighting to prevent a photochemical damage. Reflectance... more The artwork illumination requires special lighting to prevent a photochemical damage. Reflectance spectrums were measured of the UV-degraded 25 watercolour pigments and an optimal solid-state light source was modelled for this specific colour set.
Data Revues 12962074 Unassign S1296207413001532, Oct 7, 2013
ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for th... more ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for th... more ABSTRACT A simple sol-gel technique for the preparation of methyl–modified silica coatings for the protection of the external surface of copper has been used in this study. Tetraethylorthosilicate (TEOS) has been used as a precursor to prepare nanosilica coatings on the surface of copper. The methyl–modified silica sols were obtained by mixing of 3% SiO2 sol solution with trimethylchlorosilane (TMCS) or hexamethyldisilozane (HMDS) as basic materials. For comparison, the copper substrates were also coated with commercial polymers (Paraloid B 72, Plexisol P 550-40 and polyvinyl butyral (PVB)). The surface morphology changes of uncoated and coated specimens were investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The hydrophobicity of surfaces and photochemical ageing effects were evaluated by contact angle measurements. Potentiodynamic measurements were obtained in order to compare corrosion parameters of the coatings.
In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt n... more In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.
In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt n... more In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.
In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt n... more In the present work, the formation of cobalt aluminium spinel (CoAl2O4) as well as novel cobalt neodymium-aluminates with nominal compositions of CoAl1.75Nd0.25O4, CoAl1.5Nd0.5O4 and CoAlNdO4 by an aqueous sol-gel process and the sinterability of the products are investigated. The metal ions, generated by dissolving starting materials of metals in the diluted acetic acid were complexed by 1,2-ethanediol to obtain the precursors for the mixed metal ceramics. The phase purity of the synthesized compounds was characterized by powder X-ray diffraction analysis and infrared spectroscopy. The microstructural evolution and morphological features of the products were studied by scanning electron microscopy and atomic force microscopy, which together with the optical characterization of these new compounds showed that the sol-gel-derived materials could be successfully used as effective cobalt-based ceramic pigments.
... Figure 11. XRD patterns of fired at 1000 °C different glazes: sam-ple 2 (a), sample 3 (b), sa... more ... Figure 11. XRD patterns of fired at 1000 °C different glazes: sam-ple 2 (a), sample 3 (b), sample 4 (c), and sample 6 (d). Page 6. 190 Acta Chim. Slov. ... PM Rice, Pottery Analysis A Sourcebook, University of Chicago Press, Chicago, 1987. 22. MA Legodi, D. de Waal, Cryst. Eng. ...
Uploads
Papers by Jurate Senvaitiene