2021 Annual Meeting
(490a) Temperature Dependence of Diffusiophoresis Using a Novel Microfluidic Approach.
Authors
In this work, we performed systematic DP measurements at a range of temperatures to test theoretical predictions. To do so, we developed a novel microfluidic approach that allows us to impose truly steady state gradients and make direct and repeatable DDP measurements at a range of temperatures. As a model system, we performed experiments with negatively charged polystyrene particles under NaCl gradients and validated the approach at room temperature. We carried out experiments at temperatures ranging from 200C to 700C and found DP velocities and DDP to monotonically increase with temperature in relatively good quantitative agreement with theoretical predictions. Our results give further confidence to DP theory to predict DP mobilities under high temperature conditions.