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Related Concept Videos

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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Colloidal precipitates01:09

Colloidal precipitates

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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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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Colloids and Suspensions01:17

Colloids and Suspensions

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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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Solubility03:00

Solubility

20.0K
Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
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Intermolecular Forces03:13

Intermolecular Forces

66.0K
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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Light driven diffusioosmotic repulsion and attraction of colloidal particles.

Pooja Arya1, Joachim Jelken1, David Feldmann1

  • 1Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany.

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UV light drives long-range attraction and repulsion between porous particles. This light-induced diffusioosmotic effect allows for tunable particle aggregation and separation, controlled by light intensity.

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Area of Science:

  • Colloid and Surface Science
  • Photochemistry
  • Soft Matter Physics

Background:

  • Colloidal particles interact through various forces, influencing their assembly and behavior.
  • Diffusioosmotic flow, driven by concentration gradients, is a key phenomenon in microfluidics and soft matter systems.
  • Photosensitive molecules can undergo reversible transformations upon light exposure, altering their properties.

Purpose of the Study:

  • To introduce and investigate the phenomenon of light-driven diffusioosmotic attraction and repulsion of porous particles.
  • To elucidate the mechanism by which UV light influences inter-particle interactions.
  • To demonstrate the tunability of these interactions via light intensity for particle manipulation.

Main Methods:

  • Utilizing mesoporous silica particles and a photosensitive surfactant.
  • Irradiating the system with UV light to induce photo-isomerization of the surfactant.
  • Observing and analyzing the resulting flow patterns and inter-particle interactions around colloids.
  • Investigating the role of surfactant adsorption and diffusion kinetics.

Main Results:

  • UV light irradiation induces long-range attraction and repulsion between porous particles.
  • The observed interactions are driven by diffusioosmotic flow generated by light-induced surfactant isomerization and diffusion.
  • Particle aggregation or separation is reversible and can be controlled by adjusting UV light intensity.
  • The range of interaction extends significantly beyond the particle diameter.

Conclusions:

  • Light-driven diffusioosmosis offers a novel mechanism for controlling colloidal particle interactions.
  • The system demonstrates tunable long-range attraction and repulsion through external optical stimuli.
  • This phenomenon provides a versatile platform for manipulating particle ensembles in various applications.