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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
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Solvent-Engineered Stress in Nanoscale Materials.

Shaun Mills, Chiara Rotella, Eoin K McCarthy

  • 1Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States.

ACS Applied Materials & Interfaces
|November 22, 2018
PubMed
Summary

Surface stabilization layers on nanoscale materials swell in solvents, inducing significant stress and enhancing adhesion. This stress, engineered by solvent-responsive polymers, impacts nanomaterial properties and processing.

Keywords:
functionalisationink-jetnanomaterialsstrain-engineeringstresssurface passivation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Nanoscale materials often require surface stabilization layers to prevent aggregation and enable processing.
  • These layers are crucial for applications like ink-jet printing of nanomaterials.

Purpose of the Study:

  • To investigate the impact of solvent swelling in surface stabilization layers on nanomaterial stress and adhesion.
  • To demonstrate strain engineering in nanowires using solvent-responsive polymer coatings.

Main Methods:

  • Utilizing atomic force microscopy (AFM) for mechanical measurements.
  • Employing Raman spectroscopy to detect strain levels.
  • Functionalizing silver (Ag), gold (Au), and silicon (Si) nanowires with polymer and surfactant layers.

Main Results:

  • Few-nanometer-thick stabilization layers swell in solvents, inducing significant stress in nanomaterials even after solvent evaporation.
  • Solvent swelling enhances nanomaterial-substrate adhesion by preventing stress relaxation during drying.
  • Detected strain levels ranged from 0.1% to 0.6% in functionalized nanowires.
  • Solvent-exposed nanowires exhibited stress, unlike dry-transferred ones.

Conclusions:

  • Solvent-responsive surface layers can be used to engineer stress in nanoscale materials.
  • Understanding solvent-induced stress is critical for controlling nanomaterial properties and performance in devices.