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Related Concept Videos

Colloids and Suspensions01:17

Colloids and Suspensions

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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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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 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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Phase behavior and dynamics in a colloid-polymer mixture under spherical confinement.

Arabinda Bera1, Kurt Binder2, Sergei A Egorov3

  • 1Theoretical Sciences Unit and School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India. das@jncasr.ac.in.

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Summary
This summary is machine-generated.

Active colloids and passive polymers confined in a sphere form Janus-like structures. Introducing activity causes the polymer domain to become ellipsoidal, with the colloid domain rotating around its long axis.

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Area of Science:

  • Soft matter physics
  • Colloid science
  • Polymer physics

Background:

  • Understanding phase behavior and dynamics in confined colloidal systems is crucial.
  • Mixtures of active and passive components present complex emergent behaviors.
  • Simulations are key to exploring these systems at the molecular level.

Purpose of the Study:

  • To investigate the structure and dynamics of active colloid-polymer mixtures within a spherical confinement.
  • To analyze the transition from equilibrium coexistence to active, non-equilibrium states.
  • To characterize the self-organization and emergent motion induced by particle activity.

Main Methods:

  • Molecular dynamics simulations were employed to model the system.
  • Interactions were tuned to achieve equilibrium phase separation in the passive limit.
  • Velocity-aligning activity was introduced to the colloids to study non-equilibrium dynamics.

Main Results:

  • In the passive limit, systems exhibit equilibrium coexistence, forming colloid-rich and polymer-rich phases.
  • A Janus-like structure emerges, with colloids localized on one hemisphere and polymers on the other.
  • Upon introducing activity, the polymer domain deforms into an ellipsoid, and the colloid-rich domain develops angular momentum around the ellipsoid's long axis.

Conclusions:

  • Active colloids can induce significant structural and dynamic changes in confined polymer mixtures.
  • The observed ellipsoidal deformation and rotation highlight emergent self-organization in active matter systems.
  • The steady-state dynamics of the system's orientation are governed by diffusion, weakly dependent on activity strength.