Abstract
The non-equilibrium assembly of bimodal colloids during evaporative processes is an attractive means to achieve gradient or stratified layers in thick films. Here, we show that the stratification of small colloids on top of large is prevented when the viscosity of the continuous aqueous phase is too high. We propose a model where a too narrow width of the gradient in concentration of small colloids suppresses the stratification.
Highlights
We show that the stratification of small colloids on top of large is prevented when the viscosity of the continuous aqueous phase is too high
We propose a model where a too narrow width of the gradient in concentration of small colloids suppresses the stratification
Models developed by Zhou et al.,[31] Sear and Warren,[30] Sear,[32] and Rees-Zimmerman and Routh[33] make predictions for the parameter values for which stratification is observed
Summary
The non-equilibrium assembly of bimodal colloids during evaporative processes is an attractive means to achieve gradient or stratified layers in thick films. We show that the stratification of small colloids on top of large is prevented when the viscosity of the continuous aqueous phase is too high.
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