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Related Concept Videos

Colloids03:22

Colloids

21.4K
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

Colloids and Suspensions

3.6K
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...
3.6K
Colloidal precipitates01:09

Colloidal precipitates

6.5K
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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Thermal Strain01:19

Thermal Strain

2.9K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.9K
Shearing Strain01:20

Shearing Strain

1.5K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
1.5K
Measurements of Strain01:27

Measurements of Strain

2.6K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Updated: Feb 14, 2026

Fast and Sensitive Colloidal Coomassie G-250 Staining for Proteins in Polyacrylamide Gels
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Photoelastic colloidal gel for a high-sensitivity strain sensor.

Hui Pan1, Zhixin Chen2, Shenmin Zhu1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.

Nanotechnology
|February 16, 2018
PubMed
Summary

Researchers developed a novel colloidal gel from self-assembled nanoparticles. This material exhibits high elasticity and significant photoelasticity, with a tunable refractive index under stress for advanced sensor applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Soft Matter Physics

Background:

  • Nanoparticles can self-assemble into ordered structures, mimicking liquid crystal behavior.
  • Colloidal gels are versatile materials with potential applications in various fields.

Purpose of the Study:

  • To report a new type of colloidal gel assembled from 1D and 2D nanoparticles.
  • To investigate the photoelastic properties and strain sensibility of this novel material.

Main Methods:

  • Self-assembly of 1D and 2D nanoparticles into an ordered colloidal gel structure.
  • Characterization of the material's elasticity and photoelastic response.
  • Measurement of refractive index changes under external stress.

Main Results:

  • The colloidal gel exhibits high elasticity and significant photoelasticity.
  • The material's refractive index is tunable under stress, showing an ultra-wide dynamic range (Δn ~ 10⁻²).
  • An extremely high strain sensibility of 720 nm/ε was observed, an order of magnitude higher than previously reported values.

Conclusions:

  • The developed colloidal gel represents a new class of photoelastic materials.
  • The material's unique properties, including high strain sensibility, suggest potential for advanced optical sensors and stress-responsive devices.