Size dependent elastic moduli of CdSe nanocrystal superlattices predicted from atomistic and coarse grained models

2013 ◽  
Vol 139 (14) ◽  
pp. 144702 ◽  
Author(s):  
Mehdi B. Zanjani ◽  
Jennifer R. Lukes
Keyword(s):  
Elastic Moduli ◽  
Coarse Grained ◽  
Size Dependent ◽  
Nanocrystal Superlattices

Size-dependent elastic moduli of platelike nanomaterials

2003 ◽  
Vol 93 (2) ◽  
pp. 1212-1218 ◽  
Author(s):  
C. T. Sun ◽  
Haitao Zhang
Keyword(s):  
Elastic Moduli ◽  
Size Dependent

scholarly journals Development of Cube Texture in Coarse Grained Copper

1990 ◽  
Vol 12 (1-3) ◽  
pp. 37-46 ◽  
Author(s):  
M. Sindel ◽  
G. D. Köhlhoff ◽  
K. Lücke ◽  
B. J. Duggan
Keyword(s):  
Grain Size ◽  
Size Effects ◽  
Cube Texture ◽  
Rolling Texture ◽  
Rolling Reduction ◽  
Coarse Grained ◽  
Oriented Growth ◽  
Size Dependent ◽  
Deformation Textures ◽  
Oriented Material

Cube oriented deformed material has been detected in the rolling texture measured on edge sections of heavily rolled coarse grained copper. The level of intensity is low, and seems to be independent of rolling reduction over the range 93–98%. Recrystallization textures show an increasing strength of Cube with rolling reduction. The evidence is consistent with the idea that Cube nuclei are created by a mechanism similar to that proposed by Dillamore and Katoh, and the strength of the recrystallized Cube texture depends on oriented growth. Prior grain size effects are briefly examined and it is shown that deformation textures are less sharp in large grain size compared with small grain sized copper at similar strains. It is likely that the effect of grain size on cube texture formation arises from grain size dependent texture changes in the vicinity of the deformed Cube oriented material.

scholarly journals THE SURFACE- AND SIZE-DEPENDENT ELASTIC MODULI OF NANOSTRUCTURES

2007 ◽  
Vol 14 (04) ◽  
pp. 667-670 ◽  
Author(s):  
JIAN-GANG GUO ◽  
YA-PU ZHAO
Keyword(s):  
Theoretical Model ◽  
Surface Energy ◽  
Continuum Model ◽  
Elastic Moduli ◽  
Three Dimensional ◽  
Surface Effects ◽  
Surface Relaxation ◽  
Size Dependent ◽  
Analytical Expressions

A theoretical model is presented to investigate the size-dependent elastic moduli of nanostructures with the effects of the surface relaxation surface energy taken into consideration. At nanoscale, due to the large ratios of the surface-to-volume, the surface effects, which include surface relaxation surface energy, etc., can play important roles. Thus, the elastic moduli of nanostructures become surface- and size-dependent. In the research, the three-dimensional continuum model of the nanofilm with the surface effects is investigated. The analytical expressions of five nonzero elastic moduli of the nanofilm are derived, and then the dependence of the elastic moduli is discussed on the surface effects and the characteristic dimensions of nanofilms.

scholarly journals Actin crosslinker competition and sorting drive emergent GUV size-dependent actin network architecture

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yashar Bashirzadeh ◽  
Steven A. Redford ◽  
Chatipat Lorpaiboon ◽  
Alessandro Groaz ◽  
Hossein Moghimianavval ◽  
...  
Keyword(s):  
Network Architecture ◽  
Molecular Size ◽  
Coarse Grained ◽  
General Mechanism ◽  
Complex Structures ◽  
Actin Bundles ◽  
Size Dependent ◽  
Apparent Stiffness ◽  
Coarse Grained Simulations

AbstractThe proteins that make up the actin cytoskeleton can self-assemble into a variety of structures. In vitro experiments and coarse-grained simulations have shown that the actin crosslinking proteins α-actinin and fascin segregate into distinct domains in single actin bundles with a molecular size-dependent competition-based mechanism. Here, by encapsulating actin, α-actinin, and fascin in giant unilamellar vesicles (GUVs), we show that physical confinement can cause these proteins to form much more complex structures, including rings and asters at GUV peripheries and centers; the prevalence of different structures depends on GUV size. Strikingly, we found that α-actinin and fascin self-sort into separate domains in the aster structures with actin bundles whose apparent stiffness depends on the ratio of the relative concentrations of α-actinin and fascin. The observed boundary-imposed effect on protein sorting may be a general mechanism for creating emergent structures in biopolymer networks with multiple crosslinkers.

scholarly journals Actin crosslinker competition and sorting drive emergent GUV size-dependent actin network architecture

2020 ◽  
Author(s):  
Yashar Bashirzadeh ◽  
Steven A. Redford ◽  
Chatipat Lorpaiboon ◽  
Alessandro Groaz ◽  
Thomas Litschel ◽  
...  
Keyword(s):  
Network Architecture ◽  
Coarse Grained ◽  
General Mechanism ◽  
Actin Networks ◽  
Cellular Processes ◽  
Size Dependent ◽  
Sensory Projections ◽  
Coarse Grained Simulations ◽  
Cytoskeletal Networks

AbstractRobust spatiotemporal organization of cytoskeletal networks is crucial, enabling cellular processes such as cell migration and division. α-Actinin and fascin are two actin crosslinking proteins localized to distinct regions of eukaryotes to form actin bundles with optimized spacing for cell contractile machinery and sensory projections, respectively. In vitro reconstitution assays and coarse-grained simulations have shown that these actin bundling proteins segregate into distinct domains with a bundler size-dependent competition-based mechanism, driven by the minimization of F-actin bending energy. However, it is not known how physical confinement imposed by the cell membrane contributes to sorting of actin bundling proteins and the concomitant reorganization of actin networks in intracellular environment. Here, by encapsulating actin, α-actinin, and fascin in giant unilamellar vesicles (GUVs), we show that the size of such a spherical boundary determines equilibrated structure of actin networks among three typical structures: single rings, astral structures, and star-like structures. We show that α-actinin bundling activity and its tendency for clustering actin is central to the formation of these structures. By analyzing physical features of crosslinked actin networks, we show that spontaneous sorting and domain formation of α-actinin and fascin are intimately linked to the resulting structures. We propose that the observed boundary-imposed effect on sorting and structure formation is a general mechanism by which cells can select between different structural dynamical steady states.

Size-Dependent Elastic Moduli of FCC Crystal Nanofilms

2006 ◽  
Vol 924 ◽  
Author(s):  
Shih-Hsiang Chang ◽  
I-Ling Chang
Keyword(s):  
Young’S Modulus ◽  
Size Effects ◽  
Continuum Model ◽  
Elastic Moduli ◽  
Young's Modulus ◽  
Current Model ◽  
Continuum Theory ◽  
Thickness Direction ◽  
Size Dependent ◽  
Discrete Nature

ABSTRACTA semi-continuum model is constructed to study the size effects on the mechanical properties of face-cubic-center crystal structure nanofilms. Unlike the classical continuum theory, the current model directly takes the discrete nature in the thickness direction into consideration. In-plane and out-plane Poisson's ratios as well as in-plane Young's modulus are investigated with this model. It is found that the values of the Young's modulus and Poisson's ratio depend on the film thickness and approach the respective bulk values asymptotically.

Size-dependent elastic moduli and vibrational properties of fivefold twinned copper nanowires

2014 ◽  
Vol 25 (31) ◽  
pp. 315701 ◽  
Author(s):  
Y G Zheng ◽  
Y T Zhao ◽  
H F Ye ◽  
H W Zhang
Keyword(s):  
Elastic Moduli ◽  
Vibrational Properties ◽  
Copper Nanowires ◽  
Size Dependent
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