Control of crack pattern using memory effect of paste

Nakahara, Akio; Shinohara, Yuu; Matsuo, Yousuke

doi:10.1088/1742-6596/319/1/012014

Cited by 12 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, we found that water-rich carbon paste and water-rich kaolin paste have also memory of flow. 29) Since the density of carbon is 2.0 g/cm 3 and that of kaolin is 2.6 g/cm 3 , we consider that the difference in density between two materials does not play an important role in the formation of memory of flow. This idea is supported by the experimental result which will be shown in x2.…”

Section: Size Distribution Of Particlesmentioning

confidence: 99%

Effect of Interaction on the Formation of Memories in Paste

Matsuo

Nakahara

2012

J. Phys. Soc. Jpn.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Size Distribution Of Particlesmentioning

confidence: 99%

Effect of Interaction on the Formation of Memories in Paste

Matsuo

Nakahara

2012

J. Phys. Soc. Jpn.

Self Cite

View full text Add to dashboard Cite

show abstract

“…-Paste-like mixtures of fine granular materials and liquid, such as clay powder and water, retain memory of the anisotropy of mechanical perturbations, and this can lead to the formation of directional crack patterns as the paste dries. It has been found that this memory effect has various types, which are determined by the properties of the granular material, the liquid content of the initial state, and the manner in which the perturbation is applied, for example, through mechanical shaking, forced flow in the paste, application of electric or magnetic fields, etc [1][2][3][4][5][6][7]. The memory effect in the case of horizontal oscillation (memory effect of shaking) is particularly common in pastes and has been thoroughly investigated.…”

mentioning

confidence: 99%

Shaking-induced stress anisotropy in the memory effect of paste

Kitsunezaki¹,

Nakahara²,

Matsuo³

2016

EPL

Self Cite

View full text Add to dashboard Cite

When paste of fine granular particles and water is shaken in one direction and then left undisturbed, memory of the direction of shaking is retained for a sufficiently long time to result in a directional crack pattern that appears after drying. Although it has been conjectured that anisotropy in residual stresses caused by plastic deformation is responsible for this memory effect, to this time, no evidence of such anisotropy has been found. We experimentally investigated the stress in drying paste by measuring the bending of elastic plates supporting the paste sample and found stress anisotropy developing in paste. Additional bending tests suggested that paste retains plasticity during the drying process and that plastic deformation is not always frozen in place after initial shaking.

show abstract

“…That is implying the direction of desiccation cracks becomes parallel to the flow direction( Type-II memory). 30 However, in some cases, once the paste is fluidized, the paste cannot remember the direction of initial external shear and crack patterns formed are isotropic and cellular. A paste of Calcium Carbonate is a typical example of such pastes.…”

Section: Figure 6: Typical Drying Rate Curvementioning

confidence: 99%

“…A paste of Calcium Carbonate is a typical example of such pastes. 31 From literature it is also suggested that, only when the mixture is a water-poor viscoplastic-like paste with a nonzero yield stress, can the mixture distinctively remember the direction of the initial external vibration and the anisotropic crack patterns appear. 6 A paste generally consists of a powder mixed with water and is a concentrated colloidal suspension with plasticity.…”

Section: Figure 6: Typical Drying Rate Curvementioning

confidence: 99%

The Nakahara Effect and Its Influence On Solution-Based 3D Printed Films

Kwakye-Ackah¹

View full text Add to dashboard Cite

The Nakahara Effect and its Influence on Solution-Based 3D Printed Films Daryl Kwakye-Ackah Motivated by the Nakahara Effect, the influence of altering printing parameters on fragmentation mechanism(s) of directly written titanium dioxide(TiO 2) films is investigated. The Nakahara effect states that a long lasting memory can be introduced into a colloidal system prior to drying, affecting the type of crack pattern formed due to externally applied forces. TiO 2 has important applications due to its interesting semiconducting properties, tunable band gap, photocatalytic properties, biocompatibility, and relative abundance. This is the reason it is used in this project as a model printing ink system. In this research, two deposition methods (i.e. direct-ink writing and doctor-blading) were compared in order to study the Nakahara Effect. In particular, the focus was to investigate the effects of film thickness, drying process used and the concentration of primary TiO 2 particles in the aqueous ink on drying crack pattern formation. Crack patterns were observed during drying using an optical microscope, and crack lengths were measured using image analysis. Weibull statistics were used to study variability in crack patterns for the different deposition methods. The results suggest a distinction between the printed and doctor-bladed samples hence demonstrating the validity of the Nakahara Effect. They also provide new insights for the role of direct writing parameters for inducing distinct printing memory characteristics that may help to further understand and minimize crack formation during drying.

show abstract

Control of crack pattern using memory effect of paste

Cited by 12 publications

References 28 publications

Effect of Interaction on the Formation of Memories in Paste

Effect of Interaction on the Formation of Memories in Paste

Shaking-induced stress anisotropy in the memory effect of paste

The Nakahara Effect and Its Influence On Solution-Based 3D Printed Films

Contact Info

Product

Resources

About