Fluctuations in density and concentration of methanol-water mixtures at 7 MPa and 373, 423 K studied by small-angle X-ray scattering
Fluctuations in density and concentration of methanol-water mixtures at 7 MPa and 373, 423 K studied by small-angle X-ray scattering
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DOI：
10.1016/j.cplett.2004.03.031
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发表时间：
2004-05-01
影响因子：
2.8
通讯作者：
Nishikawa, K
中科院分区：
文献类型：
--
作者：
Morita, T;Nishikawa, K
通过小角 X 射线散射 (SAXS)，研究了整个摩尔分数范围内的甲醇-水混合物的结构波动对温度和压力的依赖性。样品池专为在高温高压下稳定运行而设计，保持恒定的光程长度，能够精确测量绝对 SAXS 强度，从中观察到浓度和密度的波动。将结果与在环境条件下测量的结果进行比较。随着温度和压力的升高，密度波动显着增大，而浓度波动基本不变。 (C) 2004 Elsevier B.V. 保留所有权利。
Temperature and pressure dependences of the structural fluctuations have been studied for methanol-water mixtures in the whole range of mole fractions by small-angle X-ray scattering (SAXS). A sample cell, designed for stable operation at high temperature and pressure retaining a constant path length, has enabled a precise measurement of absolute SAXS intensities, from which fluctuations in concentration and density have been observed. The results are compared with those measured at ambient conditions. The fluctuations in the density increase significantly with the rise in temperature and pressure, whereas those in the concentration remain essentially unchanged. (C) 2004 Elsevier B.V. All rights reserved.