Abstract
We investigated the evolution of concentration and phase structure of colloidal suspensions in a two-ends-open tube during drying process. The volume fraction and crystal structure of suspension in the capillary tube were determined by reflection spectrometer during drying process. Our experimental results show: (a) evaporation takes place in two directions of the tube, though much stronger in one direction than the other; (b) during drying process, colloidal suspension column along the tube can be divided into four regions, namely, the close packed region, concentrated region, initial concentration region and dilution region. A new model describing the evolution of concentration profile was proposed and the calculated results based on the model are in good agreement with the experimental ones. According to solute conservation, we also present a simple way to estimate the concentration of close packed region.
Highlights
We investigated the evolution of concentration and phase structure of colloidal suspensions in a twoends-open tube during drying process
The relevant previous study related to the above topic has indicated that the movement of the suspension due to evaporation always started from one side of the tube and the suspension was thought to be divided into two regions[25,27,28]. Distinguishing with these results, our study shows: (1) evaporation takes place in two directions of the tube, though much stronger in one direction than the other; (2) during drying process, colloidal suspension column along the tube can be divided into four regions, namely, the close packed region, concentrated region, initial concentration region and dilution region
We further put forward a new model to explain the evolution of concentration profile, the calculated results based on our model are in good agreement with the experimental results
Summary
We investigated the evolution of concentration and phase structure of colloidal suspensions in a twoends-open tube during drying process. For drying the colloidal suspension in capillary tube, the movement of suspension is normally in one direction and relevant models were developed to analyze the volume fractions of close packed structures or dense states[25]. The relevant previous study related to the above topic has indicated that the movement of the suspension due to evaporation always started from one side of the tube and the suspension was thought to be divided into two regions[25,27,28] Distinguishing with these results, our study shows: (1) evaporation takes place in two directions of the tube, though much stronger in one direction than the other; (2) during drying process, colloidal suspension column along the tube can be divided into four regions, namely, the close packed region, concentrated region, initial concentration region and dilution region. We further suggest a simple way to estimate the concentration of close packed region
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