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Related Concept Videos

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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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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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
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Linear viscoelasticity of complex coacervates.

Yalin Liu1, H Henning Winter1, Sarah L Perry1

  • 1Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA.

Advances in Colloid and Interface Science
|September 17, 2016
PubMed
Summary
This summary is machine-generated.

Linear viscoelastic measurements reveal how complex coacervate properties are affected by charge stoichiometry, ionic strength, and polymer length. Further research is needed to understand molecular interactions driving self-assembly and material dynamics.

Keywords:
CoacervatePolyelectrolytesRheologySmall-Amplitude Oscillatory ShearViscoelasticity

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Polymer Science

Background:

  • Rheology offers detailed insights into material self-assembly, structure, and interactions.
  • Complex coacervation is a liquid-liquid phase separation driven by electrostatic and entropic forces.
  • This phenomenon can lead to bulk liquid phases or hierarchical self-assembled materials.

Purpose of the Study:

  • To review the application of linear viscoelastic measurements for characterizing complex coacervate-based materials.
  • To connect thermodynamic studies of coacervation with material dynamics characterization.
  • To highlight research gaps and call for a mechanistic understanding of molecular interactions.

Main Methods:

  • Review of linear viscoelastic measurements in rheology.
  • Analysis of parameters influencing coacervation: charge stoichiometry, ionic strength, polymer chain length.
  • Linking thermodynamic phase behavior with dynamic material properties.

Main Results:

  • Demonstration of how rheological parameters influence the self-assembly and dynamics of complex coacervates.
  • Examples illustrating the impact of charge stoichiometry, ionic strength, and polymer chain length.
  • Identification of the need for integrated thermodynamic and dynamic characterization.

Conclusions:

  • Linear viscoelastic rheology is crucial for understanding complex coacervates.
  • Key parameters significantly affect coacervate self-assembly and dynamics.
  • A mechanistic understanding of molecular interactions is essential for advancing the field.