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Related Concept Videos

Colloids03:22

Colloids

21.1K
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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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers02:34

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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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Analyte Adsorption and Distribution01:09

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In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
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Colloidal precipitates01:09

Colloidal precipitates

6.5K
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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Regulating polymer adsorption on colloid by surface morphology.

Chao Wang1, Feng Yan, Xiaohui Meng

  • 1Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. dqiu@iccas.ac.cn.

Soft Matter
|October 13, 2018
PubMed
Summary
This summary is machine-generated.

Surface holes on colloidal particles significantly reduce polymer adsorption compared to surface bulges. This effect, crucial for controlling polymer interactions, depends on polymer size relative to hole dimensions.

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Area of Science:

  • Colloid and Surface Science
  • Polymer Science
  • Materials Science

Background:

  • Polymer adsorption on colloidal particles is a key phenomenon in various applications.
  • Understanding surface morphology effects on adsorption is critical for material design.

Purpose of the Study:

  • To investigate the impact of surface morphology (bulges vs. holes) on polymer adsorption onto colloidal particles.
  • To elucidate the mechanism behind morphology-dependent polymer adsorption.

Main Methods:

  • Synthesized raspberry-like (bulges) and strawberry-like (holes) colloidal particles.
  • Studied polymer adsorption on these particles using techniques sensitive to surface interactions.
  • Analyzed the influence of polymer coil size relative to surface feature dimensions.

Main Results:

  • Colloidal particle surface holes significantly hinder polymer adsorption compared to bulges.
  • This hindrance is attributed to reduced polymer accessibility within holes, especially when polymer coils exceed hole size.
  • No significant difference in adsorption was observed when polymer coils were smaller than the holes.

Conclusions:

  • Surface fine structures, specifically holes, offer a strategy to regulate polymer adsorption on colloidal particles.
  • This approach is valuable for applications where controlling polymer interactions is essential, such as in drug delivery systems.
  • Hole morphology can be engineered to minimize unwanted protein adsorption on colloidal drug carriers.