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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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Colloids and Suspensions01:17

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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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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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Dipole Moment of a Molecule
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Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Active Patchy Colloids with Shape-Tunable Dynamics.

Zuochen Wang1, Zhisheng Wang1, Jiahui Li1

  • 1Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China.

Journal of the American Chemical Society
|August 27, 2019
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Summary
This summary is machine-generated.

Researchers precisely tuned active colloid dynamics by synthesizing low-symmetry patchy particles. These engineered colloids enable control over locomotion and assembly for advanced micro- and nanomachines.

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Materials Science

Background:

  • Controlling active colloids is key for out-of-equilibrium systems and micro-machines.
  • Autonomous locomotion and spontaneous assembly of colloidal particles present significant challenges.

Purpose of the Study:

  • To demonstrate precise tuning of active colloid dynamics.
  • To introduce the synthesis of active patchy colloids with low-symmetry shapes.
  • To explore shape-encoded information programming locomotive and assembly behaviors.

Main Methods:

  • Bulk synthesis of low-symmetry patchy colloids using a cluster-encapsulation-dewetting method.
  • Utilizing AC electric fields to modulate particle propulsion, braking, and steering.
  • Investigating the impact of particle geometry, patch configuration, and aspect ratios on dynamics.

Main Results:

  • Modulation of particle propulsion velocity, braking, and steering via asymmetrical patches and bending angles.
  • Formation of dynamic, reconfigurable structures like spinners and cooperative swimmers from monopatch particles.
  • Demonstration of directional bonding in dynamic assemblies using particles with differentially sized patches.

Conclusions:

  • Low-symmetry patchy colloids offer precise control over active colloid dynamics.
  • Shape programmability is a powerful tool for designing complex colloidal behaviors.
  • Future exploration with diverse external stimuli promises novel dynamics and structures.