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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 precipitates01:09

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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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Defining Psychology01:24

Defining Psychology

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Psychology is the scientific discipline dedicated to understanding both observable behavior and the internal mental processes underlying such behavior. It aims to comprehend human nature and apply this understanding to solve practical problems, enhance well-being, and improve societal outcomes. An example of psychology's application is the study of prosocial behavior, such as why and under what conditions individuals might help strangers in need. This process involves describing observed...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Actin Polymerization01:42

Actin Polymerization

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Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
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Related Experiment Video

Updated: Jan 27, 2026

Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Temperature-Triggered Colloidal Gelation through Well-Defined Grafted Polymeric Surfaces.

Jan Maarten Van Doorn1, Joris Sprakel2, Thomas E Kodger3

  • 1Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE, Wageningen, The Netherlands. janmaarten.vandoorn@wur.nl.

Gels (Basel, Switzerland)
|March 29, 2019
PubMed
Summary

Surface properties like grafting density influence colloidal gel mechanics. Lower densities increase bond angle fluctuations, impacting overall gel rigidity and providing insights into gel behavior.

Keywords:
colloid gelgrafting densitysurface initiated atom transfer radical polymerizationtemperature-triggered gelation

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Synthesis and Characterization of Supramolecular Colloids
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Area of Science:

  • Colloid and Surface Science
  • Materials Science
  • Rheology

Background:

  • Colloidal suspensions can form rigid networks called colloidal gels when interparticle attractions are strong.
  • Understanding the relationship between particle surface properties and gel mechanics is crucial for material design.

Purpose of the Study:

  • To synthesize a model thermo-responsive colloidal system to study surface property effects on colloidal gel dynamics.
  • To investigate the impact of grafting density and chain length on particle dynamics and macroscopic gel behavior.

Main Methods:

  • Synthesis of a model thermo-responsive colloidal system.
  • Microscopic observation and analysis of thermal fluctuations in particle aggregates.
  • Rheological measurements to assess macroscopic mechanical behavior.

Main Results:

  • Lower grafting densities resulted in larger variance in bond angles during thermal fluctuations.
  • Macroscopic mechanical behavior of colloidal gels increased with both grafting density and chain length.
  • Mechanical behavior showed an inverse relationship with local bond angle fluctuations.

Conclusions:

  • Surface properties, specifically grafting density and chain length, significantly influence colloidal gel mechanics.
  • Microscopic bond angle fluctuations are directly linked to macroscopic mechanical properties.
  • This model system facilitates understanding the origins of complex mechanical behavior in colloidal gels.