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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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Progress in the Synthesis of Colloidal Machines.

Nicolle S Jackson1, Samira Munkaila1, Lasya Damaraju1

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Dynamic colloids are key to building colloidal machines, bridging scales from nano to micro. Developing synthetic combinatorial design spaces is crucial for advancing this emerging field.

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Area of Science:

  • Colloidal science
  • Materials science
  • Nanotechnology
  • Robotics

Background:

  • Colloidal science has developed anisotropic subunits for assembling static and dynamic structures.
  • Dynamic colloids are subunits capable of action in response to stimuli.
  • Colloidal machines represent an emerging subfield, distinct from traditional self-assembly.

Purpose of the Study:

  • To present the current state of colloidal science in the development of colloidal machines.
  • To highlight the potential of dynamic colloids as building blocks for machines.
  • To identify key challenges and future directions in the field.

Main Methods:

  • Utilizing anisotropic and dynamic colloidal subunits for assembly.
  • Viewing dynamic colloids as access points to colloidal machines.
  • Comparing bottom-up fabrication of dynamic colloids with top-down methods for microscale machines.

Main Results:

  • Colloidal machines (100 nm to 10 μm) are proposed as the next frontier in machine miniaturization.
  • Dynamic assemblies offer unique environmental interaction capabilities compared to static assemblies.
  • Current colloidal machines consist of single-composition dynamic subunits; future machines require multiple dynamic components.

Conclusions:

  • The development of colloidal machines bridges the gap between nano, micro, and biological machinery.
  • Repurposing existing dynamic particles is a viable strategy for creating colloidal machine components.
  • Synthetic combinatorial design spaces are essential for realizing complex colloidal machines.