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Related Concept Videos

Shearing Strain01:20

Shearing Strain

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...
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
Plastic Behavior01:21

Plastic Behavior

A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...
Strain-Energy Density01:20

Strain-Energy Density

Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this region...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.

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A Novel Platform for In Vitro Cellular Stretching and Imaging
07:38

A Novel Platform for In Vitro Cellular Stretching and Imaging

Published on: March 10, 2026

Sorption strain as a packing phenomenon.

Gerrit Günther1, Martin Schoen

  • 1Stranski-Laboratorium für Physikalische und Theoretische Chemie, Fakultät für Mathematik und Naturwissenschaften, Technische Universität Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany.

Physical Chemistry Chemical Physics : PCCP
|October 9, 2009
PubMed
Summary
This summary is machine-generated.

Sorption strains in confined fluids are primarily due to molecular packing effects, not the thermodynamic state. This finding clarifies previous observations on how adsorbed fluid amount influences material deformation.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Statistical Mechanics

Background:

  • Confined fluids exhibit unique thermodynamic properties compared to bulk phases.
  • Sorption-induced strains in porous materials are crucial for applications like gas storage and separation.
  • Previous studies noted variations in sorption strains with adsorbed fluid quantity, but the underlying cause remained unclear.

Purpose of the Study:

  • To investigate the relationship between sorption strains and the thermodynamic state of a simple fluid confined in a slit-pore.
  • To elucidate the role of substrate deformability and fluid stratification in sorption phenomena.
  • To determine the phase diagram and critical point of the confined fluid for both rigid and deformable substrates.

Main Methods:

  • Monte Carlo simulations using a semi-grand canonical ensemble.
  • Modeling fluid molecules with only translational degrees of freedom confined in a slit-pore with face-centered cubic lattice walls.
  • Employing finite-size scaling concepts to accurately locate the critical point.
  • Analyzing both rigid and deformable solid substrates.

Main Results:

  • Sorption strains are predominantly caused by packing effects (fluid stratification) within the confined space.
  • The observed variation in sorption strains with adsorbed fluid amount is largely independent of the specific thermodynamic state.
  • The phase diagram and critical point were determined for both bulk and confined fluids, considering substrate deformability.

Conclusions:

  • Molecular packing effects, specifically fluid stratification, are the primary drivers of sorption strains in confined systems.
  • This understanding reconciles previous experimental observations regarding sorption strain variations.
  • The study provides a detailed analysis of fluid behavior under confinement, including phase transitions and critical phenomena.