Effect of surface energy on size-dependent deformation twinning of defect-free Au nanowires

Nanoscale ◽  
2015 ◽  
Vol 7 (38) ◽  
pp. 15657-15664 ◽  
Author(s):  
Byungil Hwang ◽  
Mijeong Kang ◽  
Subin Lee ◽  
Christopher R. Weinberger ◽  
Phillip Loya ◽  
...  
Keyword(s):  
Surface Energy ◽  
Tensile Testing ◽  
Deformation Twinning ◽  
Size Dependent ◽  
Au Nanowires ◽  
Effect Of Surface

In this study, we report the size-dependent transition of deformation twinning studied usingin situSEM/TEM tensile testing of defect-free [110] Au nanowires/ribbons with controlled geometry.

Effect of Surface Energy on the Size-Dependent Yield Criterion of Nanoporous Materials under Complex Stress States

2011 ◽  
Vol 121-126 ◽  
pp. 15-19
Author(s):  
Liu Juan Zhu ◽  
Wen Zhong Cai ◽  
Shan Tung Tu
Keyword(s):  
Surface Energy ◽  
Nanostructured Materials ◽  
Surface Effect ◽  
Yield Criterion ◽  
Complex Stress ◽  
Nanoporous Materials ◽  
Octahedral Plane ◽  
Size Dependent ◽  
Stress States ◽  
Effect Of Surface

Within a micromechanical framework, the effect of surface energy is taken into account to explore the size-dependent yield criterion of nanoporous materials under complex stress states. A theoretical picture of the yield behavior on an octahedral plane is illustrated as functions of the surface properties and void size. The prominent size dependence of the yield criterion of nanoporous materials highlights the importance of the surface effect in analyzing the strength of nanostructured materials. The results demonstrate a fundamental framework to extend continuum strength theories to the nanoscale with substantial surface effect, which may be useful for evaluating the mechanical integrity of nanostructured materials.

Nucleation and initial growth of Pd2Si crystals on Si(111)

1993 ◽  
Vol 51 ◽  
pp. 844-845
Author(s):  
Xianghong Tong ◽  
Oliver Pohland ◽  
J. Murray Gibson
Keyword(s):  
High Vacuum ◽  
Dark Field ◽  
Ultra High Vacuum ◽  
Initial Growth ◽  
Surface And Interface ◽  
Dark Field Imaging ◽  
Transmission Electron ◽  
Initial Stage ◽  
Effect Of Surface

The nucleation and initial stage of Pd2Si crystals on Si(111) surface is studied in situ using an Ultra-High Vacuum (UHV) Transmission Electron Microscope (TEM). A modified JEOL 200CX TEM is used for the study. The Si(111) sample is prepared by chemical thinning and is cleaned inside the UHV chamber with base pressure of 1x10−9 τ. A Pd film of 20 Å thick is deposited on to the Si(111) sample in situ using a built-in mini evaporator. This room temperature deposited Pd film is thermally annealed subsequently to form Pd2Si crystals. Surface sensitive dark field imaging is used for the study to reveal the effect of surface and interface steps.The initial growth of the Pd2Si has three stages: nucleation, growth of the nuclei and coalescence of the nuclei. Our experiments shows that the nucleation of the Pd2Si crystal occurs randomly and almost instantaneously on the terraces upon thermal annealing or electron irradiation.

scholarly journals Dopants Modulate Crystal Growth in Molten Salts Enabled by Surface Energy Tuning

2021 ◽  
Author(s):  
Xiaoqiao Li ◽  
Linming Zhou ◽  
Han Wang ◽  
Dechao Meng ◽  
Guannan Qian ◽  
...  
Keyword(s):  
Crystal Growth ◽  
High Temperature ◽  
Surface Energy ◽  
Molten Salts ◽  
Rational Approach ◽  
Temperature Synthesis ◽  
Crystalline Materials ◽  
Size Dependent ◽  
High Temperature Synthesis ◽  
Energy Tuning

Crystalline materials are routinely produced via high-temperature synthesis and show size-dependent properties; however, a rational approach to regulating their crystal growth has not been established. Here we show that dopants...

Effect of Surface Energy on Shearing of Metal Asperities Contact at the Nanoscale

2020 ◽  
Vol 124 (50) ◽  
pp. 27436-27441
Author(s):  
Danyang Yu ◽  
Jin Wang ◽  
Ming Ma ◽  
Yonggang Meng
Keyword(s):  
Surface Energy ◽  
Effect Of Surface

scholarly journals Application of an improved surface energy balance model to two large valley glaciers in the St. Elias Mountains, Yukon

2020 ◽  
pp. 1-16
Author(s):  
Tim Hill ◽  
Christine F. Dow ◽  
Eleanor A. Bash ◽  
Luke Copland
Keyword(s):  
Energy Balance ◽  
Surface Energy ◽  
Surface Energy Balance ◽  
Shortwave Radiation ◽  
Balance Model ◽  
Landsat 8 ◽  
Glacier Surface ◽  
Ice Dynamics ◽  
Surface Melt

Abstract Glacier surficial melt rates are commonly modelled using surface energy balance (SEB) models, with outputs applied to extend point-based mass-balance measurements to regional scales, assess water resource availability, examine supraglacial hydrology and to investigate the relationship between surface melt and ice dynamics. We present an improved SEB model that addresses the primary limitations of existing models by: (1) deriving high-resolution (30 m) surface albedo from Landsat 8 imagery, (2) calculating shadows cast onto the glacier surface by high-relief topography to model incident shortwave radiation, (3) developing an algorithm to map debris sufficiently thick to insulate the glacier surface and (4) presenting a formulation of the SEB model coupled to a subsurface heat conduction model. We drive the model with 6 years of in situ meteorological data from Kaskawulsh Glacier and Nàłùdäy (Lowell) Glacier in the St. Elias Mountains, Yukon, Canada, and validate outputs against in situ measurements. Modelled seasonal melt agrees with observations within 9% across a range of elevations on both glaciers in years with high-quality in situ observations. We recommend applying the model to investigate the impacts of surface melt for individual glaciers when sufficient input data are available.

Deformation twinning in response to cracking in Al: An in situ TEM and molecular dynamics study

2018 ◽  
Vol 145 ◽  
pp. 28-32 ◽  
Author(s):  
Zongde Kou ◽  
Yanqing Yang ◽  
Lixia Yang ◽  
Wei Zhang ◽  
Bin Huang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Deformation Twinning ◽  
In Situ Tem
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