Light scattering for aerogel characterization
Light scattering for aerogel characterization
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DOI：
10.1016/s0022-3093(98)00048-9
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发表时间：
1998-04-01
影响因子：
3.5
通讯作者：
Hunt, AJ
中科院分区：
文献类型：
--
作者：
Hunt, AJ
光散射是评估气凝胶透明度、研究其结构、孔径大小、机械应变以及研究决定其微观结构的溶胶-凝胶演化模式的有用工具。紫外-可见光透射谱可以用来研究波长相关的散射，以便比较不同来源、不同厚度的气凝胶，并评估残留污染物的影响。红外反射率测量可以用来确定多孔气凝胶材料的有效折射率、实折射率和虚折射率，用于材料性质和辐射换热的研究。固定角度的散射测量可用于质量控制、评估散射源和研究不均匀性。测量Mueller矩阵(描述入射到散射光的强度和偏振的16个元素的角度相关转换)可以提供关于气凝胶中的各向异性、大孔隙率、诱导应力、微结构和不均匀性的信息。凝胶形成前后散射的时间演化提供了信息。(C)1998 Elsevier Science B.V.保留所有权利。
Light scattering is a useful tool to evaluate aerogel clarity, study its structure, pore size, mechanical strain, and examine the modes of sol-gel evolution that determine its microstructure. Ultraviolet-visible transmission spectroscopy can be used to study the wavelength dependent scattering to readily compare aerogels of differing origins, thickness, and to evaluate effects of residual contaminants. Infrared reflectance measurements can be used to determine the effective real and imaginary indices of refraction of porous aerogel materials for material property and radiant heat transfer studies. Measurements of scattering at a fixed angle can be used for quality control, to evaluate sources of scattering, and study inhomogeneities. Measurement of the Mueller matrix (describing the 16-element angle-dependent transformation of intensity and polarization of incident to scattered light) provides information about the anisotropy, large pore fraction, induced stresses, microstructure and inhomogeneities in the aerogel. The time evolution of scattering before and after gel formation gives information. (C) 1998 Elsevier Science B.V. All rights reserved.