Surface effects on the self equilibrium, self bending and symmetry lowering of nanofilms

Li, Jiangang; Han, Meiqin; Li, Lingfang; Gao, Zhixiang; Zhang, Huili

doi:10.1038/s41598-019-53555-x

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…Lattice structure and interatomic distance are changed. Since elastic constant is very sensitive to the interatomic distance, [26,29] the elastic property is changed. On the other hand, this surface reconstruction expands (or shrinks) the film along in-plane direction and induces reverse relaxation along vertical direction via Poisson's effect.…”

Section: Resultsmentioning

confidence: 99%

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Rolling structure from bilayer nanofilm by mismatch

Geng

Gao

et al. 2023

Chinese Phys. B

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A continuum theoretical scheme for self rolled-up nanotubes from bilayers by mismatch was obtained by considering surface elasticity, surface stress and symmetry lowering effects. For an ultrathin nanofilm with only several nanometers, isotropic mismatch and isotropic surface stress usually induce anisotropic rolling behavior. The isotropic Timoshenko formula should be modified anisotropically to interpret the mechanical behavior of anisotropic rolling structure of nanotubes accurately. The nanofilm rolled up in tangential direction while remain straight in cylindrical direction theoretically. Therefore, this paper considered the anisotropic shape of nanotubes. Along cylindrical direction, although it maintains straight and its residual strain is uniform, the stress varies through radial direction due to the Poisson’s effect of tangential strain. The applications of current theory to Si-Si nanotube, InAs-GaAs nanotube and InGaAs-Cr nanotube systems showed good agreement with experimental data. Besides surface elasticity and surface stress effects, the symmetry breaking and the anisotropic rolling structure are also of great importance in theoretical description of mechanical behavior of rolled-up nanotubes.

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Section: Resultsmentioning

confidence: 99%

“…[26,27] The core-shell model was used to extract nanowire mechanical behavior, [26] nanofilm Young's modulus, [28] and nanofilm self-equilibrium, and self-bending characteristics, etc. [29] There rises a problem in both coresurface model and core-shell model. These two hybrid models divide a nanofilm into surface area and bulk like area.…”

Section: Introductionmentioning

confidence: 99%

Rolling structure from bilayer nanofilm by mismatch

Geng

Gao

et al. 2023

Chinese Phys. B

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“…Dangling bonds arise and combine together. This surface reconstruction moves surface atoms and applies stress at film surface [30]. Since surface stress exists at any film surface, it is always called as intrinsic surface stress.…”

Section: Resultsmentioning

confidence: 99%

“…This core-shell model was used to predict the Young's modulus and the mechanical behavior of nanowires [28,29]. The Young's modulus, self equilibrium and self bending of nanofilms were also researched by using core-shell model [20,22,30].…”

Section: Introductionmentioning

confidence: 99%

Nanotube formation from self-curling nanofilms driven by intrinsic surface-stress imbalance

Li¹,

Yao²,

Xu³

et al. 2021

Phys. Scr.

Self Cite

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The theoretical analysis for fabricating nanotubes from self-curling of nanofilms due to intrinsic surface stress imbalance was given in this paper. A nanofilm was curled into a nanotube along tangential direction, while the other in-plane direction (cylindrical direction) was only elongated but wasn’t curled or bent. Film bending behavior is usually described by using Stoney formula, but the Poisson’s effect of cylindrical direction should be considered for describing mechanical behavior of curling up phenomenon. Stoney formula assumes that the surface stress is isotropic and the bending is also isotropic, but the shape of nanotube is anisotropic. On the other hand, surface effects and symmetry lowering effect strongly affect the mechanical properties of nonafilms. Here, we gave a more accurate curling theory by including surface stress, surface elasticity, symmetry lowering and Poisson’s effect of cylindrical direction.

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Nanotube formation from a self-curling nanofilm driven by surface stress: a core-surface model

Yao²,

et al. 2022

Arch Appl Mech

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Surface effects on the self equilibrium, self bending and symmetry lowering of nanofilms

Cited by 8 publications

References 36 publications

Rolling structure from bilayer nanofilm by mismatch

Rolling structure from bilayer nanofilm by mismatch

Nanotube formation from self-curling nanofilms driven by intrinsic surface-stress imbalance

Nanotube formation from a self-curling nanofilm driven by surface stress: a core-surface model

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