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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

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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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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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Scattering from Colloid-Polymer Conjugates with Excluded Volume Effect.

Xin Li1, Christopher N Lam2, Luis E Sánchez-Diáz1

  • 1Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

ACS Macro Letters
|May 21, 2022
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Summary
This summary is machine-generated.

This study models protein-polymer and nanoparticle-polymer conjugates using scattering functions. The model links conjugate conformation to component microstructure, aiding experimental analysis.

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Area of Science:

  • Soft matter physics
  • Polymer science
  • Biophysics

Background:

  • Protein-polymer and nanoparticle-polymer conjugates are crucial in various applications.
  • Understanding their solution behavior requires accurate theoretical models.
  • Existing models may not fully capture excluded volume effects and conformational details.

Purpose of the Study:

  • To develop a theoretical model for scattering functions of colloid-polymer conjugates.
  • To investigate the influence of colloid shape and polymer stiffness on scattering.
  • To provide a tool for analyzing experimental scattering data and understanding conjugate conformation.

Main Methods:

  • Derivation of scattering functions from the two-point correlation function.
  • Inclusion of excluded volume effects for self-avoiding polymer chains.
  • Modeling conjugates as a colloid particle attached to a polymer chain.

Main Results:

  • The model successfully describes the scattering signature of hard particle-polymer conjugates.
  • It reveals the dependence of scattering on colloid geometry and polymer stiffness.
  • The model elucidates the relationship between global conjugate conformation and microstructural components.

Conclusions:

  • The developed model accurately predicts scattering functions for particle-polymer conjugates.
  • It offers insights into the conformational properties of these complex systems.
  • This work enhances the understanding of structure-property relationships in conjugates.