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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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The Colloidal State

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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...
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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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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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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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Synthesis and Characterization of Supramolecular Colloids
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Colloidal alloys with preassembled clusters and spheres.

Étienne Ducrot1, Mingxin He2, Gi-Ra Yi3

  • 1Center for Soft Matter Research and Department of Physics, New York University, 726 Broadway, New York, New York 10003, USA.

Nature Materials
|March 3, 2017
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Summary
This summary is machine-generated.

Researchers developed a new DNA-guided method for self-assembling complex colloidal crystals. This approach enables the creation of previously unattainable structures, including low-coordination lattices like diamond and pyrochlore.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloidal Science

Background:

  • Self-assembly is a key method for creating colloidal crystals from various particle shapes.
  • Complex architectures, including diamond and pyrochlore lattices, have been difficult to achieve through traditional self-assembly.

Purpose of the Study:

  • To introduce a novel design principle for self-assembling complex colloidal structures.
  • To overcome limitations in current self-assembly techniques for creating specific, low-coordination lattices.

Main Methods:

  • Utilizing preassembled colloidal components (tetrahedra and spheres).
  • Employing programmed nearest-neighbor DNA-mediated interactions to guide assembly.
  • Demonstrating the formation of target superstructures.

Main Results:

  • Successfully assembled novel colloidal superstructures, including cubic and tetragonal crystals without atomic analogues.
  • Achieved percolating low-coordination diamond and pyrochlore sublattices, structures not previously formed by self-assembly.
  • Validated the efficacy of DNA-mediated interactions in directing complex particle arrangements.

Conclusions:

  • The new design principle effectively enables the self-assembly of complex colloidal architectures.
  • This DNA-programmable approach expands the possibilities for creating advanced colloidal crystals.
  • The method provides a pathway to synthesize challenging lattices for diverse applications.