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Nano-Microplate Gold Clay for Handcraft Jewelry and Decoration

宝石和宝石学杂志 2018年第S1期20卷 139-139页

作者： pimthong thongnopkun Gems and Jewelry Research Unit Faculty of GemsBurapha University Chanthaburi Campus

Gold clay is a crafting medium consisting of gold particles mixed with an organic binder and water for making jewelry or *** clay can be shaped by hand,textured,carved,formed or using *** drying and burning,the organic binder and water were decomposed and the gold particles were transformed to its final metal ***,gold clay is very expensive,it is useful to decorate the silver clay designed jewelry or small *** this research,nano-microplate gold and specific organic binder was used for producing nano-microplate gold *** objectives of this research are to study binder's type and ratios for optimum producing gold clay,and to study the heating condition for making silver and gold clay *** result showed that the clay can be fired with heating temperature at 900°C for an hour by electric *** physical properties of the gold clay at different heating temperatures were ***,prototype of jewelry using the clay was

关键词： nano-microplate gold clay producing condition handcraft jewelry

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Detection of Natural and Synthetic Emerald by Using Infrared Spectroscopy–ATR,Specular Reflection,Transflectance and Diffuse Reflectance Techniques

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宝石和宝石学杂志 2018年第S1期20卷 140-140页

作者： Aumaparn Phlayrahan pimthong thongnopkun Gem & Mineral Sciences SRU Department of Earth SciencesFaculty of ScienceKasetsart University Gems & Jewelry Research Unit Faculty of GemsBurapha UniversityChanthaburi Campus

Emerald is a green(Cr-bearing)variety of *** has also been one of the highest value and highly demanded gemstones in the *** this reason,the methods for synthesis emerald(i.e.,hydrothermal,flux grown)have been constantly *** many cases,it is hard to distinguish the natural emerald from the synthetic one using the basic ***,with the advantage of non-destructive technique,the infrared spectroscopy has been efficiently applied for the *** this study,to find the potential technique in FTIR spectroscopy for classifying between natural and synthetic emerald(hydrothermal and flux-grown),the observed spectra from the Attenuated Total Reflectance Radiation(ATR),Diffuse Reflectance(DRIFT),transflectance,and specular reflection techniques were *** result showed that the spectra obtained from the transflectance and the DRIFT techniques were similar with equal spectral *** the diffuse reflectance spectra,the transflectance spectra were not affected by the sample *** spectral features associated with water molecule in the crystal structure were clearly observed in both the DRIFT and transflectance *** the spectral features associated with weak absorption bands of water were not observed in both the DRIFT and transflectance spectra,the position of strong absorption band at 3 800-3 500 cm^(-1) and 1 635 cm^(-1) could be detected in the ATR *** addition,the lack of absorption of water between 4 000 and 3 400 cm^(-1) in flux-grown emerald samples is the clue to separate it from the natural and hydrothermal *** the meantime,the absence of the strong absorption peaks between 2 300 and 1 400 cm^(-1) in hydrothermal emerald can differentiate it from the natural one.

关键词： emerald synthetic emerald transflectance diffuse reflectance atr

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维普期刊数据库

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