Interfacial and Confined Colloidal Rod Diffusion

被引：22

作者：

Bitter, Julie L. ^{[1
]}

Yang, Yuguang ^{[2
]}

Duncan, Gregg ^{[2
]}

Fairbrother, Howard ^{[1
]}

Bevan, Michael A. ^{[2
]}

机构：

[1] Johns Hopkins Univ, Chem, Baltimore, MD 21218 USA

[2] Johns Hopkins Univ, Chem & Biomol Engn, Baltimore, MD 21218 USA

来源：

LANGMUIR | 2017年 / 33卷 / 36期

基金：

美国国家科学基金会;

关键词：

SYMMETRIC TOP MACROMOLECULES; SATURATED POROUS-MEDIA; TOBACCO-MOSAIC-VIRUS; BROWNIAN-MOTION; NANOPARTICLE INTERACTIONS; TRANSLATIONAL DIFFUSION; ROTATIONAL-DYNAMICS; CIRCULAR-CYLINDERS; HINDERED DIFFUSION; SELF-DIFFUSION;

D O I：

10.1021/acs.langmuir.7b01704

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Optical microscopy is used to measure translational and rotational diffusion of colloidal rods near a single wall, confined between parallel walls, and within quasi-2D porous media as a function of rod aspect ratio and aqueous solution ionic strength. Translational and rotational diffusivities are obtained as rod particles experience positions closer to boundaries and for larger aspect ratios. Models based on position dependent hydrodynamic interactions quantitatively capture diffusivities in all geometries and indicate particle wall separations in agreement with independent estimates based on electrostatic interactions. Short-time translational diffusion in quasi-2D porous media is insensitive to porous media area fraction, which appears to arise from a balance of hydrodynamic hindrance and enhanced translation due to parallel alignment along surfaces. Findings in this work provide a basis to interpret and predict interfacial and confined colloidal rod transport relevant to biological, environmental, and synthetic material systems.

引用

页码：9034 / 9042

页数：9

共 60 条

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