Suppression of the coffee-ring effect in a hectorite aqueous dispersion
Suppression of the coffee-ring effect in a hectorite aqueous dispersion
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锂蒙脱石水分散体中咖啡环效应的抑制
DOI：
10.1016/j.powtec.2017.04.038
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发表时间：
2017
影响因子：
5.2
通讯作者：
Kurosaka Keiichi
中科院分区：
文献类型：
--
作者：
Kimura Hiroshi;Tsuchida Akira;Kurosaka Keiichi
研究了锂蒙脱石水分散体液滴的干燥规律。锂蒙脱石的体积分数和盐浓度的分散体的范围分别为0.001至0.01和0.001 M至0.1 M。观察到干燥图案在不存在盐的情况下为环形，而在存在盐的情况下为隆起形状。高度合理的是，在盐的存在下，形成锂蒙脱石（吸引性凝胶）的三维网络结构，并且锂蒙脱石被它们之间的静电吸引力阻止，这导致网络结构在干燥过程中压缩，导致隆起形状的存款。结果表明，锂蒙脱石矿物在水中的分散状态，即“溶胶”或“凝胶”，决定了锂蒙脱石分散体的干燥模式，为抑制咖啡环效应提供了一种新的方法。
The drying patterns of droplets of hectorite aqueous dispersions were studied. The hectorite volume fractions and salt concentrations of the dispersions ranged from 0.001 to 0.01 and from 0.001 M to 0.1 M, respectively. It was observed that the drying pattern was ring shaped in the absence of salt and bump shaped in the presence of salt. It is highly plausible that, in the presence of a salt, a three-dimensional network structure of hectorites (an attractive gel) is formed and the hectorites are arrested by an electrostatic attractive force among them, which leads to compression of the network structure in the drying process, resulting in the bump-shaped deposit. It was revealed that the dispersion state, “sol” or “gel,” of the hectorite mineral in the water dominates the drying pattern of the hectorite dispersion and offers a new method for suppression of the coffee-ring effect.