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Colloids03:22

Colloids

21.3K
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...
21.3K
Mixtures of Acids03:27

Mixtures of Acids

21.9K
The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
21.9K
Mixtures of Acids01:19

Mixtures of Acids

1.1K
The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
In a strong and weak acid mixture, the strong acid dissociates completely and becomes a source of almost all the hydronium ions present in the solution. In contrast, the weak acid shows...
1.1K
Sinusoidal Sources01:18

Sinusoidal Sources

1.2K
Direct current (DC) refers to an electric current that flows in a single direction, maintaining a constant polarity. This is in contrast to alternating current (AC), which periodically changes its direction and magnitude. AC forms the backbone of modern electricity transmission and distribution systems due to its efficient long-distance transmission capabilities.
In homes, the power supplies use sinusoidal sources to provide electricity. These sources generate a voltage that varies sinusoidally...
1.2K
Colloids and Suspensions01:17

Colloids and Suspensions

3.5K
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...
3.5K
Exponential and Sinusoidal Signals01:18

Exponential and Sinusoidal Signals

741
The exponential function is crucial for characterizing waveforms that rise and decay rapidly. This continuous-time exponential function is defined using exponential terms with constants α and A. When both constants are real, the function is represented as,
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Related Experiment Video

Updated: Feb 12, 2026

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

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Dense colloidal mixtures in an external sinusoidal potential.

R F Capellmann1, A Khisameeva1, F Platten1

  • 1Condensed Matter Physics Laboratory, Heinrich Heine University, Universitätsstr. 1, 40225 Düsseldorf, Germany.

The Journal of Chemical Physics
|March 24, 2018
PubMed
Summary
This summary is machine-generated.

In colloidal mixtures, light fields create periodic potentials. Increasing potential strength localizes particles but can cause demixing, while higher density promotes homogeneous arrangements.

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Area of Science:

  • Soft matter physics
  • Colloidal science
  • Optical physics

Background:

  • Understanding colloidal systems is crucial for materials science and nanotechnology.
  • Periodic potentials can be used to control particle self-assembly.
  • Binary colloidal mixtures offer complex behaviors due to differing particle sizes.

Purpose of the Study:

  • To investigate the arrangement of binary colloidal particles under a periodic optical potential.
  • To analyze the influence of particle-potential and particle-particle interactions on colloidal assembly.
  • To determine how potential amplitude and particle concentration affect mixture homogeneity.

Main Methods:

  • Utilizing a periodic potential generated by two crossed laser beams.
  • Employing optical microscopy to record particle arrangements.
  • Characterizing particle distribution using pair distribution functions, occupation probabilities, and angular bond distributions.

Main Results:

  • Increased potential amplitude enhanced particle localization, particularly for larger particles.
  • Higher potential amplitude and particle density led to small particles occupying potential maxima.
  • Elevated potential amplitude induced local demixing, while increased packing fraction favored homogeneous arrangements.

Conclusions:

  • Periodic potentials offer tunable control over colloidal particle localization and mixing.
  • The interplay between external fields and interparticle forces dictates the final arrangement.
  • Findings provide insights into designing complex colloidal structures for advanced applications.