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溶胶-凝胶法制备纳米复合材料的研究进展 总被引:1,自引:0,他引:1
溶胶-凝胶法用于制备纳米粒子复合材料,因组分、制备途径和结构等可优化设计,故产物性能优异。本文介绍了溶胶-凝胶法制备的纳米粒子复合材料在光学、电子、磁学、生物、催化等领域的应用和最新研究进展。 相似文献
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有机-无机纳米复合材料的制备、性能及应用 总被引:2,自引:0,他引:2
综述了有机-无机纳米复合材料的最新发展,包括该类材料的制备方法、性能研究和应用前景.纳米复合技术主要有3种:溶胶-凝胶法、嵌入法和纳米微粒填充法.纳米复合材料的光学和磁学等性能可用Maxwell形态理论、层状结构理论和分形结构理论等来研究.这类材料已在力学、热学、电学、磁学、光学、宇航和生物仿生等领域表现出广阔的应用前景. 相似文献
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综述了聚苯胺纳米复合材料的制备方法,结合典型事例详细评述了化学氧化和电化学合成法、等离子体聚合、原位聚合法、乳液和微乳液聚合、插层法、溶胶-凝胶法、自组装技术等各种制备方法的优缺点,并展望了聚苯胺纳米复合材料的研究方向与应用前景. 相似文献
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自然纤维素物质是一种具有复杂的微观结构且价格低廉、简单易得的生物模板.简述了自然纤维素的微观结构和自然纤维素物质结合表面溶胶-凝胶法制备纳米材料的机理,并介绍了以自然纤维素物质为模板结合溶胶-凝胶法制备单一组分纳米管与纳米纤维、复合材料和其他功能纳米材料的研究进展. 相似文献
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A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling. 相似文献
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An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a
rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate
agreement is demonstrated between the derived relations and experimental data. 相似文献
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水三相点是开尔文热力学温度的唯一基准点,也是ITS-90国际温标重要的定义固定点。因此,水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来,中国计量科学研究院研制出一系列高质量的水三相点容器,加强了水三相点的研究,为不确定度的分析提供了更为可靠的实验依据。同时,不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此,根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明,其扩展不确定度为0.16mK(k=2.69,P=0.99)。 相似文献
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Liebert A Wabnitz H Grosenick D Möller M Macdonald R Rinneberg H 《Applied optics》2003,42(28):5785-5792
A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue. 相似文献
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