Observation and analysis of the depolarized Rayleigh doublet in isotropic MBBA and measurement of the de Gennes viscosity coefficients
Observation and analysis of the depolarized Rayleigh doublet in isotropic MBBA and measurement of the de Gennes viscosity coefficients
复制标题
各向同性MBBA中去偏振瑞利双峰的观察与分析及德热讷粘度系数的测量
DOI：
10.1063/1.434784
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发表时间：
1977
影响因子：
4.4
通讯作者：
G. Patterson
中科院分区：
文献类型：
--
作者：
G. R. Alms;T. Gierke;G. Patterson
研究了对甲氧基苄基苯胺（MBBA）各向同性相的去极化（IVH）瑞利光散射谱中的双重态。所有的光谱都很好地符合粘稠液体中IVH光谱的Andersen-Pecora理论。在150-230°C范围内，MBBA的旋转-平移耦合参数R值为0.36±0.02，与温度无关。安徒生-佩科拉理论的参数与德·热纳的现象学理论有直接的对应关系。从这种对应关系中，我们得到了德热纳“a”参数的微观方程。利用这种de Gennes参数“a”的微观计算，我们计算了MBBA的de Gennes粘度参数ν。利用R的测量值和ν和η的值，我们得到了MBBA的de Gennes粘度参数μ的值。结果表明，从旋转扩散的滑移模型可以很容易地计算出MBBA的ν值，并且具有很好的精度。罪……
The doublet in the depolarized (IVH) Rayleigh light scattering spectrum was studied in the isotropic phase of p‐methoxybenzylidene‐ (p‐n‐butyl) aniline, (MBBA). All spectra were found to fit well to the Andersen–Pecora theory for the IVH spectrum in viscous liquids. The value of the rotational–translational coupling parameter R was determined to be 0.36±0.02 for MBBA, independent of temperature over the range 150–230 °C. A direct correspondence is made between the parameters of the Andersen–Pecora theory and the phenomenological theory of de Gennes. From this correspondence we obtain a microscopic equation for the de Gennes ’’a’’ parameter. Using this microscopic evaluation of the de Gennes parameter ’’a’’, we evaluate the de Gennes viscosity parameter ν for MBBA. Using the measured value of R and the values of ν and η we obtain values for the de Gennes viscosity parameter μ for MBBA. We show the value of ν for MBBA can be easily calculated from the slip model of rotational diffusion to good accuracy. Sin...