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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...
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  1. Home
  3. Interlayer Sp3 Bonds And Chirality At Bilayer Graphene Oxide/calcium Silicate Hydrate Abnormally Enhance Its Interlayer Stress Transfer.
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  3. Interlayer Sp3 Bonds And Chirality At Bilayer Graphene Oxide/calcium Silicate Hydrate Abnormally Enhance Its Interlayer Stress Transfer.

Related Experiment Video

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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Interlayer sp3 Bonds and Chirality at Bilayer Graphene Oxide/Calcium Silicate Hydrate Abnormally Enhance Its

Lei Fan1, Fangyuan Song1, Jingjing Xu2

  • 1School of Civil Engineering and Architecture, Zhejiang University of Science & Technology, Hangzhou 310023, PR China.

ACS Omega
|March 11, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a method to enhance the interface between graphene oxide (GO) and C-S-H, significantly improving stress transfer in layered nanostructures. This breakthrough addresses a key limitation in using GO as a reinforcing material.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Graphene oxide (GO) is a promising reinforcing material, but its practical application is limited by weak filler-matrix interfaces.
  • Existing GO-based composites often fail to achieve theoretical strength and toughness due to poor interlayer stress transfer.
  • Weak interfacial bonding hinders the effective utilization of GO's exceptional properties in composite materials.

Purpose of the Study:

  • To propose a controllable method for enhancing interlayer stress transfer in double-layer graphene oxide/C-S-H (D-GO-CSH) nanostructures.
  • To investigate the role of interlayer sp³ bonds and chirality in improving interfacial properties.
  • To provide a novel strategy for optimizing the performance of GO-reinforced composites.

Main Methods:

  • Utilized molecular dynamics simulations and fracture mechanics theory.
  • Investigated the formation and impact of interlayer sp³ bonds (e.g., OH-sp3, OO-sp3 models).
  • Analyzed the influence of bond distribution and graphene oxide chirality (e.g., zigzag-cen model).

Main Results:

  • The introduction of interlayer sp³ bonds significantly enhanced normalized shear stress and pull-out energy (up to 44.93% and 49.25%, respectively).
  • Normalized interlayer stress transfer increased more than threefold with interlayer sp³ bonds, with minor effects on strain energy.
  • The effectiveness of sp³ bonds was found to be dependent on their distribution and the chirality of GO.

Conclusions:

  • Interlayer sp³ bonds are crucial for improving interlayer stress transfer, pull-out energy, and shear stress in D-GO-CSH nanostructures.
  • Controlling the formation and distribution of sp³ bonds offers a new pathway to enhance GO-based composite performance.
  • The findings provide a fundamental understanding for designing advanced nanocomposites with superior mechanical properties.