Related Experiment Video
Updated: Oct 23, 2025
09:35
Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
Published on: July 28, 2020
5.1K
Kinetically driven island morphology in growth on strained Cu(100).
Indiras Khatri1, Ehsan H Sabbar1, Yunsic Shim1
1Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606, USA.
The Journal of Chemical Physics
|August 22, 2021
Summary
Strain significantly alters copper (Cu) diffusion and island formation on copper (Cu) substrates. Tensile strain promotes exchange mechanisms, leading to anisotropic island growth, while compressive strain results in mixed island morphologies.
Area of Science:
- Surface Science
- Materials Science
- Computational Materials Science
Background:
- Understanding surface growth mechanisms is crucial for designing novel materials.
- Biaxial strain can significantly influence adatom diffusion and island formation kinetics.
- Previous studies on Cu/Ni(100) have shown complex island morphologies under strain.
Purpose of the Study:
- To investigate the impact of biaxial strain on monomer and dimer diffusion mechanisms.
- To analyze the resulting island morphology during Cu growth on strained Cu(100).
- To elucidate the kinetic mechanisms governing anisotropic island formation under tensile strain.
Main Methods:
- Theoretical calculations of activation barriers for diffusion mechanisms.
- Temperature-accelerated dynamics simulations of submonolayer growth at 200 K.
- Analysis of island morphology and step dynamics under varying strain conditions.
Main Results:
- Activation barriers for diffusion show a near-linear dependence on strain.
- Compressive strain leads to mixed open/closed step morphologies; tensile strain (>2%) favors exchange mechanism.
- 8% tensile strain results in a single, highly anisotropic island due to anisotropic attachment barriers, not energetics.
Conclusions:
- Strain engineering offers a powerful route to control surface morphology.
- Anisotropic attachment barriers, driven by strain, can lead to anisotropic island formation even with isotropic diffusion.
- A novel kinetic mechanism for anisotropic island formation under tensile strain is proposed.
More Related Videos
13:58Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
Published on: September 28, 2016
12.0K
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.3K
Related Concept Videos
02:11Conformations of Cyclohexane
13.9K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
13.9K
01:20Shearing Strain
747
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...
747
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
373
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.
373
00:57Cationic Chain-Growth Polymerization: Mechanism
2.5K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.5K
01:20Elastic Strain Energy for Shearing Stresses
329
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...
329
01:20Normal Strain under Axial Loading
769
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
769