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Related Concept Videos

Colloids03:22

Colloids

20.5K
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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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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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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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Protein Complex Assembly02:41

Protein Complex Assembly

16.5K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

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Complex Self-Assembly from Simple Interaction Rules in Model Colloidal Mixtures.

Santi Prestipino1, Domenico Gazzillo2, Gianmarco Munaò1

  • 1Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra , Università degli Studi di Messina , Viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy.

The Journal of Physical Chemistry. B
|October 5, 2019
PubMed
Summary
This summary is machine-generated.

Researchers simulated colloidal particle self-assembly, observing sphere and dimer interactions. They discovered that controlling particle size and concentration can yield diverse structures like aggregates, membranes, and vesicles for materials design.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Soft Matter Physics

Background:

  • Hierarchical structures in nature arise from self-assembly.
  • Artificial materials design benefits from mimicking self-assembly for tailored functions.

Purpose of the Study:

  • To explore spontaneous assembly of colloidal particles into extended structures via simulation.
  • To investigate the influence of particle size and concentration on self-assembled structures.

Main Methods:

  • Implicit solvent simulation of spheres and size-asymmetric dimers.
  • Modeling short-range attraction between spheres and small monomers.
  • Observing system evolution from disordered states at low temperature and density.

Main Results:

  • Sphere-monomer size ratio dictates emergent structures.
  • Observed elongated sphere aggregates, crystalline bilayers, flexible membrane sheets, and monolayer vesicles.
  • Diverse structures form based on relative concentrations of spheres and dimers.

Conclusions:

  • The simulation model provides a template for controlling self-assembly in dilute colloidal suspensions.
  • Tailored functional materials can be designed by controlling particle interactions and concentrations.
  • Dimer-mediated aggregation offers a route to complex hierarchical structures.