Interfacial and Confined Colloidal Rod Diffusion
| Autor: | Julie L. Bitter, Gregg A. Duncan, Yuguang Yang, Michael A. Bevan, D. Howard Fairbrother |
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| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
business.industry Chemistry Rotational diffusion 02 engineering and technology Surfaces and Interfaces 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrostatics 01 natural sciences Aspect ratio (image) Rod 0104 chemical sciences Condensed Matter::Soft Condensed Matter Colloid Optics Chemical physics Electrochemistry General Materials Science Diffusion (business) 0210 nano-technology Porous medium business Spectroscopy |
| Zdroj: | Langmuir. 33:9034-9042 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.7b01704 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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