Journal
ACS NANO
Volume 9, Issue 2, Pages 2148-2156Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00019
Keywords
porous media; diffusion; nanoparticle; transport; single-particle tracking; fluorescence
Categories
Funding
- U.S. Department of Energy Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division [DE-SC0001854]
- National Science Foundation [EFRI-1038305]
- Materials Science and Engineering Program at the University of Colorado Boulder
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1038305] Funding Source: National Science Foundation
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The inherent pore-scale heterogeneity of many natural and synthetic porous materials can make it difficult to model and predict porous transport because the underlying microscopic processes are often poorly understood. Here we present the results of single-particle tracking experiments in which we followed the pore-scale diffusion of individual nanoparticles, deep within a three-dimensional porous material of moderate porosity. We observed significant hydrodynamic damping of particle motion at subpore length scales, resulting in heterogeneous and spatially dependent mobility. The accessibility of the void space was strongly dependent on particle size, and related to the heterogeneous hydrodynamics. Our results suggest that pore-scale diffusion is more heterogeneous and volume accessibility more limited than previously expected. The method demonstrated here will enable studies of a broad new class of materials including porous polymers of technological interest.
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