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Colloids and Suspensions

Colloids and Suspensions

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...

Colloids

Colloids

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...

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...

Coagulation

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Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...

Steady, Laminar Flow Between Parallel Plates

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly

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Active responsive colloids driven by intrinsic dichotomous noise.

Nils Göth¹, Upayan Baul¹, Joachim Dzubiella^1,2

¹Applied Theoretical Physics-Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany.

Physical Review. E

|January 21, 2023

Summary

Intrinsic noise significantly impacts responsive colloids (RCs), altering their size and interactions. This noise drives changes in colloid structure and dynamics, enabling adaptive material properties.

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Area of Science:

Soft Matter Physics
Colloid Science
Materials Science

Background:

Responsive colloids (RCs) actively change size and interactions.
Internal degrees of freedom (DOF) are crucial for colloid behavior.
Self-crowding effects are significant in dense colloidal systems.

Purpose of the Study:

Investigate the influence of intrinsic noise on the structure and dynamics of RCs.
Model active colloids with internal size fluctuations (dichotomous noise).
Analyze crowding effects on spatial distributions, relaxation times, and self-diffusion.

Main Methods:

Developed a dichotomous active responsive colloid (D-ARC) model.
Incorporated internal dichotomous noise for size "breathing".
Employed stochastic computer simulations for dense suspensions.

Main Results:

Observed transitions from unimodal to bimodal size distributions with increasing colloid density.
Found intrinsic noise significantly modifies diffusive translational dynamics.
Demonstrated noise-induced changes in spatial distributions and relaxation times.

Conclusions:

Intrinsic noise is a key factor in the collective behavior of D-ARCs.
Controlling internal noise offers a powerful method for tuning active colloidal materials.
Autonomous adaptation of macroscopic properties is achievable through noise modulation.