Analysis of molecular dynamics of colloidal particles in transported dilute samples by self-mixing laser Doppler velocimetry.
Analysis of molecular dynamics of colloidal particles in transported dilute samples by self-mixing laser Doppler velocimetry.
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DOI：
10.1364/ao.51.000370
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发表时间：
2012-01
期刊：
影响因子：
1.9
通讯作者：
S. Sudo;T. Ohtomo;M. Iwamatsu;Tuyoshi Osada;K. Otsuka
中科院分区：
文献类型：
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作者：
S. Sudo;T. Ohtomo;M. Iwamatsu;Tuyoshi Osada;K. Otsuka
利用自混合激光多普勒测速仪对液体介质中的胶体粒子进行了匀速输运和动态光散射实验。由胶体颗粒的运动引起的调制波的功率谱不能用流动布朗运动系统的公知公式来描述，即，多普勒频移、扩散和平移的组合。相反，发现功率谱由q-高斯分布函数描述。导致这种异常的功率谱线形状的分子机制归因于传输的稀样品中的胶体颗粒的异常分子动力学，其满足非线性朗之万方程。
Colloidal particles in a liquid medium are transported with constant velocity, and dynamic light scattering experiments are performed on the samples by self-mixing laser Doppler velocimetry. The power spectrum of the modulated wave induced by the motion of the colloidal particles cannot be described by the well-known formula for flowing Brownian motion systems, i.e., a combination of Doppler shift, diffusion, and translation. Rather, the power spectrum was found to be described by the q-Gaussian distribution function. The molecular mechanism resulting in this anomalous line shape of the power spectrum is attributed to the anomalous molecular dynamics of colloidal particles in transported dilute samples, which satisfy a nonlinear Langevin equation.