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Related Concept Videos

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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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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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).
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Intermolecular Forces

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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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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Noncovalent Attractions in Biomolecules02:35

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Updated: Dec 23, 2025

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
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Heteroaggregation between Charged and Neutral Particles.

Gregor Trefalt1, Tianchi Cao1, Takuya Sugimoto2

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva, Sciences II, 30 Quai Ernest-Ansermet, 1205 Geneva, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 24, 2020
PubMed
Summary
This summary is machine-generated.

Heteroaggregation between charged and neutral colloidal particles is fast and diffusion-controlled. The study reveals neutral particle surfaces strongly regulate, behaving like constant potential surfaces, aligning with DLVO theory predictions.

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Area of Science:

  • Colloid and Surface Science
  • Physical Chemistry

Background:

  • Understanding colloidal particle interactions is crucial for various applications.
  • Previous studies have focused on homoaggregation or heteroaggregation between similarly charged particles.

Purpose of the Study:

  • To experimentally determine heteroaggregation rates between charged and neutral colloidal particles.
  • To compare experimental findings with the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory.

Main Methods:

  • Synthesized neutral polystyrene latex particles via adsorption of charged additives.
  • Measured heteroaggregation rates using time-resolved multiangle light scattering.

Main Results:

  • Observed that heteroaggregation between charged and neutral particles is consistently fast and diffusion-controlled.
  • Found the heteroaggregation process to be highly sensitive to charge regulation conditions.

Conclusions:

  • Experimental results strongly support that neutral particle surfaces exhibit significant charge regulation, behaving akin to constant potential surfaces.
  • This behavior aligns with DLVO theory and direct force measurements on similar systems.