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Related Concept Videos

Transformation of Plane Strain01:12

Transformation of Plane Strain

435
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
435
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

11.4K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
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Thermal Strain01:19

Thermal Strain

2.7K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.7K
Transformation of Plane Stress01:18

Transformation of Plane Stress

620
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
620
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

529
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
529
Plastic Behavior01:21

Plastic Behavior

461
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...
461

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Related Experiment Video

Updated: Dec 25, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

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Substrate induced strain for on-surface transformation and synthesis.

Jie Su1, Xinbang Wu, Shaotang Song

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore. chmtm@nus.edu.sg chmluj@nus.edu.sg.

Nanoscale
|April 1, 2020
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Summary

Strain engineering is a powerful tool for controlling chemical reactions. This review highlights how substrate-induced strain drives on-surface reactions for novel nanomaterial synthesis.

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Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation
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Related Experiment Videos

Last Updated: Dec 25, 2025

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High-resolution Imaging of Nuclear Dynamics in Live Cells under Uniaxial Tensile Strain
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Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation
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Area of Science:

  • Surface science
  • Nanomaterials synthesis
  • Chemical reaction engineering

Background:

  • Intermolecular strain is a key factor in wet chemical synthesis.
  • On-surface synthesis protocols are complex and underexplored.
  • Sub-molecular resolution microscopy reveals reaction pathways.

Purpose of the Study:

  • To review recent findings on strain-induced on-surface reactions.
  • To explore substrate-induced processes for altering chemical reactivity.
  • To highlight the potential for on-surface synthesis of novel nanomaterials.

Main Methods:

  • Scanning probe microscopy for sub-molecular resolution imaging.
  • Analysis of on-surface reaction pathways.
  • Investigating substrate-induced strain effects.

Main Results:

  • Substrate-induced strain can significantly alter chemical reactivity.
  • Strain engineering provides a novel approach for on-surface synthesis.
  • Atomically-precise functional nanomaterials can be synthesized using this method.

Conclusions:

  • Strain-induced on-surface reactions offer a promising alternative for synthesis.
  • Understanding strain effects is crucial for advancing on-surface chemistry.
  • This approach enables the creation of novel functional nanomaterials with precise structures.