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Strain and Elastic Modulus01:15

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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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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Hardness and Elastic Modulus on Six-Fold Symmetry Gold Nanoparticles.

Manuel Ramos1,2, Luis Ortiz-Jordan3, Abel Hurtado-Macias4

  • 1Departmento de Física y Matemáticas, Instituto de Ingenieríay Tecnología, UACJ, Avenida del Charro #450 Nte. Cd. Juárez, Chihuahua, C.P. 32312, Mexico. manuel.ramos@uacj.mx.

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Summary

This study presents the synthesis of gold nanoparticles (AuNPs) using a simple chemical method. The synthesized AuNPs exhibit icosahedral symmetry and possess significant hardness and elastic modulus properties.

Keywords:
HRTEMgoldhardnessnanoindentationnanoparticles

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Chemistry

Background:

  • Gold nanoparticles (AuNPs) are of great interest due to their unique optical and electronic properties.
  • Understanding the synthesis and mechanical behavior of AuNPs is crucial for their applications.

Purpose of the Study:

  • To chemically synthesize gold nanoparticles (AuNPs).
  • To characterize the morphology and mechanical properties of the synthesized AuNPs.

Main Methods:

  • Chemical synthesis of AuNPs using gold (III) chloride trihydrate and sodium citrate in aqueous solution at 100 °C.
  • Morphological analysis using high-resolution transmission electron microscopy (HRTEM).
  • Mechanical property evaluation via nanoindentation measurements.

Main Results:

  • AuNPs were successfully synthesized with an average size of 22 nm and displayed six-fold icosahedral symmetry.
  • Nanoindentation revealed a hardness of 1.72 GPa and an elastic modulus of 100 GPa at the nanoparticle surface.

Conclusions:

  • The study demonstrates a facile method for synthesizing well-defined gold nanoparticles.
  • The characterized mechanical properties suggest potential for AuNPs in applications requiring robust nanomaterials.