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活性聚苯乙烯膜诱导碳酸钙异相成核结晶 总被引:4,自引:0,他引:4
0引言生物矿物材料(如骨、牙齿、贝壳等)的优异性能[1]使得无机材料的仿生合成(又称有机模板合成)成为近年来研究的热点之一[2]。该合成技术的优点是,通过有机物分子与无机离子的相互作用,能够在温和的条件下合成出具有多级结构、特殊形貌和优异性能的有机/无机复合材料。CaCO3 相似文献
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Shape apprearance and crystallite characterization of magnesium hydroxide at different hydrothermal tempera-tures have been investigated by SEM, XRD and DSC methods. The grain size, cell parameter and lattice distortion rate of powders under each condition were obtained. The results show that the grains had grown up, especially along the (001) surface as the hydrothermal temperature was raised, accompanying the shrinkage of lattice and the de-scending of distortion rate. These could be relate to the re-crystallization of Mg(OH)2, as well as the thermal dif-fusion of OH- with lower charges, resulting in good dispersion, high thermal decomposition temperature and en-thalpy of Mg(OH)2. Moreover, it is helpful for the increase of the retardant behavior of Mg(OH)2. 相似文献
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在有机介质中制备有机质复合氢氧化镁,并对产品进行水热处理.通过XRD、SEM和TG-DTA的分析表明,非水热处理得到的复合氢氧化镁晶体粒径及晶面间距较小,晶格畸变率大,其分解温度比纯氢氧化镁降低14~68 ℃.经水热处理后,有机质复合氢氧化镁晶体变规整,晶粒增大、畸变率减小,聚集体大小均匀、分散性改善,其分解温度相应提高5~20 ℃,晶体平均粒径增加31.3~69.1 nm. 相似文献
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纳米晶构筑一维多孔氧化锌的合成与表征 总被引:1,自引:0,他引:1
One-dimensional porous zinc oxide was prepared via the calcination of zinc oxalate precursor obtained by solvothermal method. The products were characterized by XRD, SEM, TEM, photoluminescence (PL) spectrum and nitrogen adsorption-desorption. The results show that the obtained zinc oxide sample is porous and constructed by nanoparticles about 30 nm in size. The specific surface area and total pore volume are 126 m2·g-1 and 0.13 cm3·g-1, respectively. The PL properties related with defects in ZnO nanoparticles were discussed for porous zinc oxide samples. 相似文献
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本文结合透射电镜分析研究了 sol-gel方法制备的纯二氧化钛和掺铁二氧化钛干凝胶的晶化过程。计算了在不同的煅烧温度下二氧化钛微晶的晶胞参数,晶粒度,畸变等参数的变化关系。应用非晶物质晶化晶核生长速率方程计算的晶粒生长活化能表明晶粒生长分为两个阶段,临界点大约为相变温度。纯的和掺铁的二氧化钛在两个阶段的晶粒生长活化能分别约为 20.8kJ· mol-1,70.9kJ· mol-1和 26.6kJ· mol-1,78.8kJ· mol-1。这个差别可能是由于相变过程首先发生在小晶粒上,导致小晶粒生长较为困难所致。 相似文献