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Colloids03:22

Colloids

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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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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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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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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Intermolecular Forces in Solutions02:28

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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Synthesis and Characterization of Supramolecular Colloids
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Structural Nonequilibrium Forces in Driven Colloidal Systems.

Nico C X Stuhlmüller1, Tobias Eckert1, Daniel de Las Heras1

  • 1Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany.

Physical Review Letters
|September 20, 2018
PubMed
Summary
This summary is machine-generated.

A novel structural force field stabilizes spatial variations in Brownian systems. This force, perpendicular to flow and free of dissipation, helps manage density gradients in nonequilibrium systems.

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Area of Science:

  • Statistical mechanics
  • Soft matter physics
  • Computational physics

Background:

  • Nonequilibrium systems exhibit complex behaviors driven by external forces and fluctuations.
  • Understanding the interplay of forces and particle dynamics is crucial for predicting system evolution.
  • Brownian many-body systems are fundamental models for diverse phenomena, from colloidal suspensions to biological processes.

Purpose of the Study:

  • To identify and characterize a structural one-body force field.
  • To investigate its role in sustaining spatial inhomogeneities in overdamped Brownian systems.
  • To provide a quantitative understanding of viscous and structural forces, including memory and shear migration effects.

Main Methods:

  • Exact time evolution in the Smoluchowski low-density limit.
  • Brownian dynamics simulations.
  • A novel power functional approximation.

Main Results:

  • Identification of a structural one-body force field.
  • Demonstration that this force sustains spatial inhomogeneities.
  • The force is perpendicular to local flow, dissipation-free, and microscopically resolved.
  • The force stabilizes density gradients.
  • Quantitative understanding of viscous and structural forces, memory, and shear migration.

Conclusions:

  • A novel structural force field is key to maintaining spatial inhomogeneities in nonequilibrium Brownian systems.
  • This force offers a mechanism for stabilizing density gradients without viscous dissipation.
  • The findings provide a deeper quantitative insight into the complex dynamics of such systems.