Effect of Interaction on the Formation of Memories in Paste

Abstract

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.

10 pages, 11 figures, Title changed

References in corpus (4)

• An Experimental Investigation of the Scaling of Columnar Joints
• Transition in the pattern of cracks resulting from memory effects in paste
• Imprinting the memory into paste and its visualization as crack patterns in drying process
• Continuum theory of memory effect in crack patterns of drying pastes

Cited by in corpus (5)

• Crack patterns over uneven substrates
• Flow velocity-dependent transition of anisotropic crack patterns in CaCO${}_3$ pastes
• X-ray computerized tomography observation of Lycopodium paste incorporating memory of shaking
• Memory effect of external oscillation on residual stress in a paste
• Memory of rotation in residual stress of paste