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Multipolarization Dynamic Light Scattering of Nonspherical Nanoparticles in Solution
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-01-26 00:00:00 , DOI: 10.1021/acs.jpcc.6b10226 Alexander D. Levin 1 , Ekaterina A. Shmytkova 1 , Boris N. Khlebtsov 2
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-01-26 00:00:00 , DOI: 10.1021/acs.jpcc.6b10226 Alexander D. Levin 1 , Ekaterina A. Shmytkova 1 , Boris N. Khlebtsov 2
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Application of dynamic light scattering (DLS) for sizing of non-spherical nanoparticles using copolarized and cross-polarized components of the scattered light is limited by the difficulties of measurement of very weak cross-polarized light intensity and problems with inverting of the scattering data into direct prediction of nanoparticles size parameters. Here we propose the new technique, called multipolarization DLS, based on time-resolved measurements of the scattered light intensity at different angles between the incident and scattered light polarizations. The physical model giving the relation between particle’s translational and rotational diffusion coefficients and intensity autocorrelation function (ACF) for the arbitrary angle between the incident and scattered polarizations is developed. Numerical algorithm for the inverse problem of calculating the diffusion coefficients from the family of ACFs is introduced, and a semiempirical approach for length and diameter estimation of quasi-cylindrical nanoparticles from the diffusion coefficients is proposed. The application to Au and Fe2O3 nanorods, in particular to monitor the selective etching-induced size changing, is described. In comparison with depolarized DLS, the method allows one to avoid measurement of the very weak cross-polarized component of the scattered light, and gives more data for solving the inverse problem of size parameter reconstruction from the scattered light intensity.
中文翻译：
溶液中非球形纳米粒子的多极化动态光散射
动态光散射（DLS）用于使用散射光的同极化和交叉偏振分量对非球形纳米粒子进行尺寸测定的应用受到限制，因为测量非常弱的交叉偏振光强度的困难以及将散射数据转换为反光的问题直接预测纳米粒子的尺寸参数。在这里，我们基于入射光和散射光偏振之间不同角度的散射光强度的时间分辨测量结果，提出了一种称为多偏振DLS的新技术。建立了物理模型，给出了入射和散射极化之间任意角度的粒子平移和旋转扩散系数与强度自相关函数（ACF）之间的关系。提出了一种基于ACF族计算扩散系数反问题的数值算法，并提出了一种基于半扩散系数的准圆柱形纳米粒子长度和直径估计的半经验方法。在金和铁中的应用描述了2 O 3纳米棒，特别是用于监测选择性蚀刻引起的尺寸变化。与去偏振的DLS相比，该方法可以避免测量散射光的非常弱的交叉偏振分量，并且可以提供更多的数据来解决从散射光强度重建尺寸参数的逆问题。
更新日期：2017-01-26
中文翻译：
溶液中非球形纳米粒子的多极化动态光散射
动态光散射（DLS）用于使用散射光的同极化和交叉偏振分量对非球形纳米粒子进行尺寸测定的应用受到限制，因为测量非常弱的交叉偏振光强度的困难以及将散射数据转换为反光的问题直接预测纳米粒子的尺寸参数。在这里，我们基于入射光和散射光偏振之间不同角度的散射光强度的时间分辨测量结果，提出了一种称为多偏振DLS的新技术。建立了物理模型，给出了入射和散射极化之间任意角度的粒子平移和旋转扩散系数与强度自相关函数（ACF）之间的关系。提出了一种基于ACF族计算扩散系数反问题的数值算法，并提出了一种基于半扩散系数的准圆柱形纳米粒子长度和直径估计的半经验方法。在金和铁中的应用描述了2 O 3纳米棒，特别是用于监测选择性蚀刻引起的尺寸变化。与去偏振的DLS相比，该方法可以避免测量散射光的非常弱的交叉偏振分量，并且可以提供更多的数据来解决从散射光强度重建尺寸参数的逆问题。
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