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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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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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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Organic chemistry is the study of compounds of carbon called organic compounds. Organic compounds either originate from living organisms or are synthesized by chemists. A defining trait of these compounds is the presence of carbon as the principal element, which is bonded to other carbon atoms and other elements such as hydrogen, oxygen, nitrogen, and sulfur. The existence of a wide array of organic molecules is a consequence of carbon atoms’ ability to form up to four strong bonds to...
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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Colloidal chemistry with patchy silica nanoparticles.

Pierre-Etienne Rouet1,2, Cyril Chomette2, Laurent Adumeau2

  • 1CNRS, Univ. Bordeaux, CRPP, UMR 5031, 115, av. du Dr Albert Schweitzer 33600 Pessac, France.

Beilstein Journal of Nanotechnology
|December 29, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel method to create colloidal molecules (CMs) using functionalized nanoparticles. This technique allows for precise control over the assembly of these nanoscale building blocks, mimicking molecular structures.

Keywords:
colloidal moleculescovalent bondingpatchy nanoparticlesvalence

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Area of Science:

  • Nanotechnology and Materials Science
  • Supramolecular Chemistry
  • Colloid Science

Background:

  • Colloidal molecules (CMs) are nanoscale assemblies that mimic the structure and symmetry of atomic molecules.
  • Existing methods for synthesizing CMs often lack precise control over structure and composition.
  • Functionalized nanoparticles, termed colloidal atoms (CAs), offer potential as building blocks for complex nanostructures.

Purpose of the Study:

  • To report a new synthetic route for fabricating colloidal molecules (CMs) with controlled symmetry.
  • To demonstrate the assembly of CMs mimicking specific molecular geometries (AX4, AX3E1, AX2E2, AX2).
  • To explore the creation of complex, multifunctional nanostructures using diverse building blocks.

Main Methods:

  • Site-specific functionalization of patchy nanoparticles (colloidal atoms, CAs) with amide bonds.
  • Controlled coupling of functionalized CAs with complementary nanospheres.
  • Application of principles analogous to the Gillespie formalism for predicting CM structures based on CA valency and stoichiometry.

Main Results:

  • Successfully synthesized AX4, AX3E1, and AX2E2 CMs from tetravalent sp3-like CAs by varying reactant ratios.
  • Produced AX2 CMs using divalent sp-like CAs.
  • Demonstrated the covalent attachment of two distinct satellite nanoparticle types to a single central CA, enabling complex CM formation.

Conclusions:

  • A versatile and controlled method for synthesizing colloidal molecules with defined symmetries has been established.
  • The approach allows for the creation of complex, multifunctional nanostructures through precise control over shape and composition.
  • This work opens new avenues for fabricating advanced nanomaterials with tailored properties.