排序方式: 共有69条查询结果,搜索用时 125 毫秒
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The highly pure nano-crystal Mg, Al-hydrotalcite with titania doping was synthesized by one-step liquid reaction method at atmospheric pressure. The preparation of the Mg,Al-hydrotalcite nano-crystal after doping titaniawas investigated according'to-the results of XRD, TEM, IR and DSC. Moreover, based on the DSC test results, the thermal mechanism functions of the Mg,Al-hydrotalcite with titania doping were studied after calculation and comparison. 相似文献
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纳米晶体纤维素Ⅱ的制备与表征研究 总被引:7,自引:1,他引:7
用硫酸水解棉短绒得到的纳米晶体纤维素Ⅰ(NCC-Ⅰ),经1%的NaOH处理后就可得到纳米晶体纤维素Ⅱ(NCC-Ⅱ)。用X-射线衍射仪、TEM、AFM、FITR和GPC表征,证明NCC-Ⅰ有低的分子量、窄的分子量分布及较高的化学活性;在FTIR谱中,NCC-Ⅰ的羟基波数较之棉短绒的羟基波数有明显的蓝移现象。研究证明纳米晶体纤维素具有十分明显的纳米效应。 相似文献
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纳米氧化锌材料的最新研究和应用进展 总被引:3,自引:0,他引:3
综述了纳米氧化锌材料的表面修饰和改性、特殊形态纳米氧化锌材料的制备和性质、纳米氧化锌材料新的开发和应用前景等,指出了目前存在的一些问题和可能的发展趋势. 相似文献
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Predictive model based on artificial neural net for purity of perovskite-type SrTiO3 nanocrystalline
A three-layer structure back-propagation network model based on the non-linear relationship between the purity of the perovskite-type SrTiO3 nano-crystal samples and the technology factors, such as reaction time, reaction temperature, raw material adding amount of NaOH and SrCl2, and the rate of TiCl4/H1, was established. The input variables were pretreated by using the main component analysis firstly. Moreover, the momentum terms were introduced so as to accelerate the converging rate and avoid the non-converging situation. At the same time, the variable learning speed was adopted. The results show that the improved back propagation neural network model is very efficient for the prediction of the perovskite-type SrTiO3 nano-crystal sample purity. 相似文献
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外加氦气流下脉冲激光沉积制备纳米硅晶粒成核区宽度的计算 总被引:1,自引:1,他引:0
在室温、10 Pa氦气氛围中,采用脉冲激光沉积(PLD)技术,通过在烧蚀羽辉正上方距靶面不同位置垂直引入一束氦气流,在烧蚀点正下方与烧蚀羽辉轴线平行放置的衬底上沉积了一系列纳米Si晶薄膜。扫描电子显微镜(SEM)、拉曼(Raman)散射光谱和X射线衍射(XRD)谱检测结果均表明,纳米Si晶粒在距靶一定的范围内形成,其尺寸随与靶面距离的增加先增大后减小。在分析衬底上的晶粒尺寸及其位置分布的基础上,结合流体力学模型、成核分区模型、热动力学方程以及晶粒形成后的类平抛运动,计算得出了纳米Si晶粒的成核区宽度为56.2 mm。 相似文献
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以聚苯乙烯-丙烯酸微球为模板制备CdS空心球壳 总被引:3,自引:0,他引:3
以苯乙烯 丙烯酸聚合物微球为模板 ,利用核 /壳法制备了不同粒径的CdS中空球壳。首次采用了酸性萃取剂二 ( 2 乙基己基 )磷酸 (P2 0 4 )的钠盐作为制备苯丙颗粒模板的乳化剂。当乳化剂的质量分数在 1 5 6 %~ 3 5 4 %范围内逐渐增大时 ,乳液粒子颗粒的直径在 30 0~ 1 2 0nm范围内逐渐减小 ,制得的CdS中空球壳粒径也相应在 40 0~ 1 5 0nm范围内减小。所制得的样品采用红外光谱法、X 射线衍射法和透射电镜法进行了表征 相似文献