CO₂-leakage-driven diffusiophoresis causes spontaneous accumulation of charged materials in channel flow.

ABSTRACT: We identify a phenomenon where the onset of channel flow creates an unexpected, charge-dependent accumulation of colloidal particles, which occurs in a common-flow configuration with gas-permeable walls, but in the absence of any installed source of gas. An aqueous suspension of either positively charged (amine-modified polystyrene; a-PS) or negatively charged (polystyrene; PS) particles that flowed into a polydimethylsiloxane (PDMS) channel created charge-dependent accumulation 2 to 4 min after the onset of flow. We unravel the phenomenon with systematic experiments under various conditions and model calculations considering permeability of the channel walls and [Formula: see text]-driven diffusiophoresis. We demonstrate that such spontaneous transport of particles is driven by the gas le

SUBMITTER: Shim S 

PROVIDER: S-EPMC7585034 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature