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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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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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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Multivalency Pattern Recognition to Sort Colloidal Assemblies.

Sebastian Loescher1,2,3, Andreas Walther1,2,3

  • 1Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Strasse 31, 79104, Freiburg, Germany.

Small (Weinheim an Der Bergstrasse, Germany)
|January 15, 2021
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Summary
This summary is machine-generated.

Precise DNA origami patterns on nanocylinders enable self-sorting of colloidal assemblies. This geometric control over multivalency unlocks new possibilities for organizing soft matter and designing functional materials.

Keywords:
3D DNA origamihost/guest chemistrymultivalencypatchy colloidsself-assembly

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Area of Science:

  • Colloidal science
  • Nanotechnology
  • Biomolecular engineering

Background:

  • Multivalent interactions are key to self-assembly and colloid formation.
  • Current methods lack precise control over binding partner distribution, unlike viral assembly.

Purpose of the Study:

  • To exploit 3D DNA origami for geometrically precise multivalency patterns on nanocylinders.
  • To achieve self-sorting of colloidal assemblies based on these precise patterns.

Main Methods:

  • Utilizing 3D DNA origami to create specific interaction patterns on nanocylinder patches.
  • Designing geometrically precise multivalency recognition sites.
  • Investigating self-sorting behavior based on pattern geometry.

Main Results:

  • Achieved self-sorting of colloidal assemblies with identical binding motifs but different patterns.
  • Demonstrated modulation of sorting degree via geometric pattern overlap.
  • Showcased homo-, mixed-, and alternating supracolloidal polymerizations.

Conclusions:

  • Geometrically precise multivalency patterns offer an advanced information layer for soft matter organization.
  • This approach is crucial for engineering biological responses and designing novel functional materials.