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The Colloidal State01:29

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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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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 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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Self-assembly of active colloidal molecules with dynamic function.

Rodrigo Soto1, Ramin Golestanian2

  • 1Departamento de Física, Facultad de Ciencias Físicas y Matemáticas Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 13, 2015
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Summary
This summary is machine-generated.

Chemically active colloids create molecular gradients, forming dynamic structures. These self-assembled systems mimic protein design, exhibiting functions like oscillation and bacterial-like movement.

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Area of Science:

  • Colloid science
  • Chemical physics
  • Materials science

Background:

  • Catalytically active colloids create nonequilibrium conditions, acting as molecular sources and sinks.
  • Individual, symmetrically coated colloids lack intrinsic activity, but their chemical activity generates concentration gradients.
  • These gradients influence interactions, leading to attraction or repulsion of other colloids.

Purpose of the Study:

  • To investigate the formation and properties of molecules from chemically active colloids.
  • To explore the creation of self-assembled structures with time-dependent functionalities.
  • To demonstrate a design strategy for dynamic colloidal systems analogous to protein functionality.

Main Methods:

  • Studying dilute solutions of catalytically active colloids.
  • Analyzing the formation of colloidal molecules through generalized ionic bonds.
  • Investigating structures exhibiting spontaneous oscillatory and run-and-tumble dynamics.

Main Results:

  • Chemically active colloids form molecules via generalized ionic bonds in dilute solutions.
  • Achieved self-assembled structures with time-dependent functionalities.
  • Demonstrated colloidal molecules with oscillatory conformations and bacterial-like run-and-tumble dynamics.

Conclusions:

  • Catalytically active colloids can self-assemble into functional molecular structures.
  • The dynamical functionalities are dictated by the three-dimensional structure of the assembled colloids.
  • This approach offers a protein-design-inspired strategy for creating dynamic materials.