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Diffusion of Anisotropic Colloids in Periodic Arrays of Obstacles
- Source :
- Langmuir. 36:11866-11872
- Publication Year :
- 2020
- Publisher :
- American Chemical Society (ACS), 2020.
-
Abstract
- Colloidal suspensions in confined geometries exhibit rich diffusion dynamics governed by particle shapes and particle-confinement interactions. Here, we propose a colloidal system, consisting of ellipsoids in periodic array of obstacles, to investigate the confined diffusion of anisotropic colloids. From the obstacle density-dependent diffusion, we discover a decoupling of translational and rotational diffusion in which only rotational motion is localized while translational motion remains diffusive. Moreover, by evaluating the probability distributions of displacements, we found Brownian but non-Gaussian diffusion behaviors with increasing the obstacle densities, which originates from the shape anisotropy of the colloid and the multiplicity of the local configurations of the ellipsoids with respect to the obstacle. Our results suggest that the shape anisotropy and spatial confinements play a vital role in the diffusion dynamics. It is important for understanding the transportations of anisotropic objects in complex environments.
- Subjects :
- Physics
Rotation around a fixed axis
Rotational diffusion
02 engineering and technology
Surfaces and Interfaces
Decoupling (cosmology)
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Ellipsoid
0104 chemical sciences
Condensed Matter::Soft Condensed Matter
Classical mechanics
Obstacle
Electrochemistry
General Materials Science
Multiplicity (chemistry)
0210 nano-technology
Anisotropy
Spectroscopy
Brownian motion
Subjects
Details
- ISSN :
- 15205827 and 07437463
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Langmuir
- Accession number :
- edsair.doi.dedup.....078bd6f99343a5d8c71c84d4b4cb30b3