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Related Concept Videos

The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Colloidal precipitates01:09

Colloidal precipitates

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...
Colloids03:22

Colloids

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...
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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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Published on: March 16, 2020

Chain stiffness and attachment-dependent attraction between polyelectrolyte-grafted colloids.

Gaurav Arya1

  • 1Department of NanoEngineering, 9500 Gilman Drive, Mail Code 0448, University of California, San Diego, La Jolla, California 92093, USA. garya@ucsd.edu

The Journal of Physical Chemistry. B
|November 13, 2010
PubMed
Summary
This summary is machine-generated.

Chain stiffness and surface attachment significantly alter interactions between grafted colloidal particles. Constrained attachment amplifies attraction with stiff chains, unlike free attachment, impacting colloidal system design.

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Area of Science:

  • Colloid and Surface Science
  • Computational Physics
  • Polymer Physics

Background:

  • Understanding interparticle forces is crucial for colloidal system design.
  • Polyelectrolyte-grafted particles exhibit complex interactions influenced by chain properties and surface attachment.
  • Monte Carlo simulations offer a powerful tool for investigating these interactions at a molecular level.

Purpose of the Study:

  • To investigate the impact of chain stiffness and surface attachment mode on the effective interactions between polyelectrolyte-grafted colloidal particles.
  • To map the attractive and repulsive regimes in a two-dimensional charge space.
  • To elucidate the underlying energetic and entropic mechanisms governing these interactions.

Main Methods:

  • Utilized Monte Carlo simulations for coarse-grained resolution of polyelectrolyte-grafted colloidal particles.
  • Computed distance-dependent potentials of mean force (PMF) between particle pairs.
  • Examined two chain stiffnesses (flexible, stiff) and two attachment modes (free, constrained) at low grafting densities.

Main Results:

  • Chain stiffness effects on intercolloid attraction differ significantly between free and constrained attachment modes.
  • Freely attached stiff chains showed marginal attraction reduction compared to flexible chains.
  • Constrained stiff chains exhibited significantly stronger and broader attraction than flexible chains.

Conclusions:

  • Surface attachment mode is a critical parameter for modulating intercolloid interactions, alongside chain stiffness.
  • Accounting for attachment modes is essential for accurate computational and experimental studies of colloidal systems.
  • Findings provide insights for controlling colloidal interactions for applications in stabilization and self-assembly.