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Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
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When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Synthesis and Characterization of Supramolecular Colloids
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Buckling of a drying colloidal drop.

Mahesh S Tirumkudulu1

  • 1Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India. mahesh@che.iitb.ac.in.

Soft Matter
|August 31, 2018
PubMed
Summary
This summary is machine-generated.

Drying colloidal drops buckle due to capillary stress. This study provides formulas for critical buckling pressure, aiding formulation design in pharmaceuticals, food, and ceramics.

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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Chemical Engineering

Background:

  • Drying colloidal dispersions form particle shells that buckle.
  • Capillary stresses during drying cause this buckling.
  • Conditions for buckling and its relation to particle properties are not fully understood.

Purpose of the Study:

  • To derive explicit expressions for the critical capillary pressure causing droplet buckling.
  • To identify conditions to avoid buckling in colloidal dispersions.
  • To provide a basis for designing formulations in relevant industries.

Main Methods:

  • Mechanical analysis of the particle network formed during drying.
  • Derivation of critical capillary pressure formulas.
  • Investigation of buckling avoidance conditions.

Main Results:

  • Explicit expressions for critical capillary pressure derived.
  • Formulas relate buckling to particle network properties.
  • Conditions for preventing buckling identified.

Conclusions:

  • The study provides a theoretical framework for understanding and controlling buckling in drying colloidal droplets.
  • Results are applicable to optimizing formulations in the pharmaceutical, food, and ceramics industries.
  • Understanding buckling is key for successful material processing and product development.