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Based on the sol-gel technique using butyl titanate as oxide precursor, the regenerated SF (silk fibroin)/nano-TiO2 composite films were synthesized. Different amounts of butyl titanate to SF were used to verify this effect on the characteristics of the formed materials. Samples were characterized by thermogravimetric analysis, X-ray diffractometry, UV, AFM and FT-IR spectroscopy.The experimental results reveal that, compared to the pure silk fibroin films, the mechanical strength of these regenerated SF/nano-TiO2 composite films were increased and the dissolubility in water of SF/nano-TiO2 composite films in aqueous solution were decreased. The diameter of nano-TiO2 particle films was about 80nm through UV and AFM. The nano-TiO2 particles were well dispersed in the regenerated silk fibroin. It was found that the crystal structures of the composite films were transited from typical Silk Ⅰ to typical Silk Ⅱ by the XRD and FTIR. Furthermore, the crystallinity of the composite films was obviously improved. Through the TGA, it was demonstrated that the heat transition temperature of composite films was also enhanced. 相似文献
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金矿床黄铁矿晶形标型特征实验研究 总被引:16,自引:0,他引:16
本文综合岩金矿床成矿地质特征,用实验模拟金矿成矿环境,研究在水热体系中不同的fo_2,fs_2,T(℃)、p(Pa)和C(介质盐度)等条件下形成的黄铁矿晶形:五角十二面体—八面体—立方体等单形演化序列、生长机理及金矿成矿作用的联系。实验结果说明黄铁矿晶形特征不仅与温度有关,而是与组成黄铁矿的铁硫地球化学性质和环境所处各种物理化学条件综合作用的结果。 相似文献
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对液相中形成纳米碳酸钙所加的分散剂和晶型控制剂,温度、浓度和搅拌速度等对晶形及聚集态的影响作了初步的研究,在反应温度8~15℃,反应物浓度0.1~0.4mol/L,搅拌速度3~20r/s,反应物加料时间4~12min的工艺条件下,可制备出粒径约50nm的高分散纳米碳酸钙,所控条件和相应的产品结果较令人满意。 相似文献
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