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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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Colloids and Suspensions01:17

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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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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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Support Reactions in Three Dimensions01:27

Support Reactions in Three Dimensions

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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
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Relative Velocity in One Dimension01:10

Relative Velocity in One Dimension

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The understanding of the concept of reference frames is essential to discuss relative motion in one or more dimensions. When we say that an object has a certain velocity, we must state the velocity with respect to a given reference frame. In most examples, this reference frame has been Earth. For instance, if a statement reads that a person is sitting in a train moving at 10 m/s east, then it implies that the person on the train is moving relative to the surface of Earth at this velocity,...
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Relative Velocity in Two Dimensions01:11

Relative Velocity in Two Dimensions

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Relative velocity is the velocity of an object as observed from a particular reference frame, or the velocity of one reference frame with respect to another reference frame. The concept of relative velocity can be used to describe motion in two dimensions. Consider a particle P and two reference frames S and S′. The position of the origin of S′ as measured in S is , the position of P as measured in S′ is , and the position of P as measured in S is , which can be evaluated by utilizing...
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Related Experiment Video

Updated: Jan 22, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

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Colloidal particle aggregation in three dimensions.

Henrike Häbel1,2, Aila Särkkä3,2, Mats Rudemo3,2

  • 1Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.

Journal of Microscopy
|July 4, 2019
PubMed
Summary
This summary is machine-generated.

Researchers explored silica nanoparticle aggregation using advanced microscopy. Dynamic and static models were compared to experimental data, finding Gibbs point process models effectively simulate observed colloidal structures.

Keywords:
Colloidal aggregationGibbs point processPotential functionSilica nanoparticle gelSpatial cluster analysis

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Area of Science:

  • Materials Science
  • Colloid Science
  • Nanotechnology

Background:

  • Colloidal systems are vital for everyday products and advanced materials.
  • Understanding and controlling colloidal interactions is crucial for many applications.
  • Silica nanoparticles are a key focus in materials science research.

Purpose of the Study:

  • To investigate the applicability of dynamic aggregation models (diffusion-limited cluster aggregation and reaction-limited cluster aggregation) to experimental silica nanoparticle data.
  • To compare experimentally obtained silica aggregates with structures simulated by dynamic models.
  • To fit and evaluate static Gibbs point process models for their ability to represent silica aggregate structures.

Main Methods:

  • Acquisition of 3D micrographs of silica nanoparticle aggregates using high-angle annular dark field scanning transmission electron microscopy tomography.
  • Simulation of particle aggregation using diffusion-limited cluster aggregation and reaction-limited cluster aggregation models.
  • Fitting of static Gibbs point process models to experimental and simulated data.

Main Results:

  • Dynamic aggregation models were assessed for their ability to reproduce experimental silica aggregate structures.
  • Gibbs point process models were successfully fitted to the experimental silica data, simulating similar structures.
  • Fitting Gibbs models to simulated cluster aggregation patterns indicated a lower aggregation probability is needed for structures resembling the experimental data.

Conclusions:

  • Gibbs point process models show promise in accurately simulating colloidal particle aggregation structures observed in microscopy.
  • The study provides insights into modeling and understanding the formation of silica nanoparticle aggregates.
  • This research contributes to the development of advanced materials through better control of colloidal systems.