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Related Concept Videos

The Colloidal State01:29

The Colloidal State

69
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Stress Concentrations01:24

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Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
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Relating microstructure and particle-level stress in colloidal crystals under increased confinement.

Neil Y C Lin1, Itai Cohen1

  • 1Department of Physics, Cornell University, Ithaca, New York 14853. yl834@cornell.edu.

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|October 27, 2016
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Confining crystalline materials alters their mechanical properties. Under compression, these materials form smaller domains with localized stress, indicating increased brittleness and modified microstructures.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Colloidal Science

Background:

  • Mechanical properties of crystalline materials are significantly influenced by confinement.
  • Altered microstructures and internal stress fields govern these macroscopic property changes.

Purpose of the Study:

  • To investigate the effects of confinement on the mechanical properties of colloidal polycrystals.
  • To quantify local structure and single-particle stress during quasi-static squeeze flow.

Main Methods:

  • Utilized a parallel plate geometry for quasi-static squeeze flow compression of colloidal polycrystals.
  • Employed confocal microscopy for simultaneous imaging and quantification of local structure order.
  • Applied Stress Assessment from Local Structural Anisotropy (SALSA) to determine single-particle scale stress.

Main Results:

  • Crystalline regions fractured into smaller domains with distinct geometric packing under compression.
  • Pressure and deviatoric stress exhibited high localization within these domains.
  • Correlation lengths for stress were found to be half those in bulk samples.
  • Mean deviatoric stress nearly doubled compared to bulk samples.

Conclusions:

  • Confinement significantly alters the mechanical response of colloidal polycrystals.
  • Localized stress domains and increased deviatoric stress suggest enhanced brittleness in confined systems.
  • The findings provide insights into microstructure evolution and stress distribution under confinement.