Effect of Interaction on the Formation of Memories in Paste

Details Effect of Interaction on the Formation of Memories in Paste Effect of Interaction on the Formation of Memories in Paste

2011-01-05

arxiv.org/abs/1101.0953v2

Journal of the Physical Society of Japan 81 (2012) 024801

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 11 figures, Title changed

Scientific paper

10.1143/JPSJ.81.024801

A densely packed colloidal suspension with plasticity, called paste, is known to remember directions of vibration and flow. These memories in paste can be visualized by the morphology of desiccation crack patterns. Here, we find that paste made of charged colloidal particles cannot remember flow direction. If we add sodium chloride into such paste to screen the Coulombic repulsive interaction between particles, the paste comes to remember flow direction. That is, one drop of salt water changes memory effect in the paste and thereby we can tune the morphology of desiccation crack patterns more precisely.

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