scholarly journals Анизотропия поверхностной энергии и поверхностного слоя некоторых халькогенидов металлов

2021 ◽  
Vol 70 (1) ◽  
pp. 151-161
Author(s):  
В.М. Юров ◽  
В.И. Гончаренко ◽  
В.С. Олешко
Keyword(s):  
Surface Layer ◽  
Surface Energy ◽  
Empirical Model ◽  
Size Effects ◽  
Metal Chalcogenides ◽  
Physical Effects

The paper proposes an empirical model, which in combination with the model of A.I. Rusanov. makes it possible to calculate the anisotropy of the surface energy and the thickness of the surface layer of metals and their compounds. Calculations were made for six metal chalcogenides. The surface energy and the thickness of the surface layer have a significant effect on nanoelectronics, since in the nanoregion, size effects affect all physical effects

Anisotropy of Surface Energy and Thickness of the Surface Layer of Magnetic Nanostructures

2021 ◽  
Vol 23 (2) ◽  
pp. 59-62
Author(s):  
Yurov V.M. ◽  
◽  
Goncharenko V.I. ◽  
Oleshko V.S. ◽  
◽  
...  
Keyword(s):  
Surface Layer ◽  
Surface Energy ◽  
Crystal Structures ◽  
Magnetic Nanostructures ◽  
Surface Energy Anisotropy ◽  
Energy Anisotropy

In this work, we show how to calculate the surface energy anisotropy and the thickness of the surface layer of some magnetic nanostructures. As an example, the minerals of magnetite, ulvespineli, ilmenite andpseudobrukite, which have different crystal structures, are considered.

Surface energy and thickness of surface layer of atomic-smooth metals silicides

2019 ◽  
Author(s):  
V. M. Yurov ◽  
E. N. Eremin ◽  
S. A. Guchenko ◽  
V. Ch. Laurinas
Keyword(s):  
Surface Layer ◽  
Surface Energy

Orientation dependent size effects in single crystalline anisotropic nanoplates with regard to surface energy

2015 ◽  
Vol 379 (22-23) ◽  
pp. 1437-1444 ◽  
Author(s):  
Abbas Assadi ◽  
Manouchehr Salehi ◽  
Mehdi Akhlaghi
Keyword(s):  
Surface Energy ◽  
Size Effects ◽  
Single Crystalline

Bending of marble with intrinsic length scales : A gradient theory with surface energy and size effects

1998 ◽  
Vol 08 (PR8) ◽  
pp. Pr8-399-Pr8-406 ◽  
Author(s):  
I. Vardoulakis ◽  
G. Exadaktylos ◽  
S. K. Kourkoulis
Keyword(s):  
Surface Energy ◽  
Size Effects ◽  
Gradient Theory ◽  
Length Scales ◽  
Intrinsic Length

scholarly journals Functionalized Surface Layer on Poplar Wood Fabricated by Fire Retardant and Thermal Densification. Part 2: Dynamic Wettability and Bonding Strength

Forests ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 982 ◽  
Author(s):  
Demiao Chu ◽  
Jun Mu ◽  
Stavros Avramidis ◽  
Sohrab Rahimi ◽  
Shengquan Liu ◽  
...  
Keyword(s):  
Contact Angle ◽  
Surface Layer ◽  
Surface Energy ◽  
Bonding Strength ◽  
Sessile Drop ◽  
Combined Treatment ◽  
Treated Wood ◽  
Fire Retardant ◽  
Tangential Section ◽  
Droplet Volume

In continuation of our former study on a novel combined treatment of nitrogen–phosphorus fire retardant and thermomechanical densification on wood, this study focuses on the dynamic wettability and the bonding strength. The contact angle was measured using the sessile drop method and the surface energy was calculated according to the van Oss method. Water surface penetrating and spreading is analyzed by both the Shi and Gardner model and the droplet volume changing model. The results reveal that the combined treatment increased the surface energy, especially the acid–base component. The contact angle declined and the water droplet spread more easily on the surface. Meanwhile, the rate of relative droplet volume decreased by 32.6% because the surface layer was densified and stabilized by the combined process. Additionally, the surface possesses the lowest roughness and highest abrasion resistance on the tangential section. Thus, the bonding strength of the combined treated poplar decreased by 29.7% compared to that of untreated poplar; however, it is still 53.3% higher than that of 220 °C heat-treated wood.

An empirical model for free surface energy of strained solids at different temperature regimes

2006 ◽  
Vol 252 (15) ◽  
pp. 5384-5386 ◽  
Author(s):  
S. Garruchet ◽  
O. Politano ◽  
J.M. Salazar ◽  
A. Hasnaoui ◽  
T. Montesin
Keyword(s):  
Free Surface ◽  
Surface Energy ◽  
Empirical Model ◽  
Free Surface Energy ◽  
Temperature Regimes

scholarly journals SIZE-DEPENDENT ELASTIC MODULUS AND FRACTURE TOUGHNESS OF THE NANOFILM WITH SURFACE EFFECTS

2008 ◽  
Vol 15 (05) ◽  
pp. 599-603 ◽  
Author(s):  
JIAN-GANG GUO ◽  
LI-JUN ZHOU ◽  
YA-PU ZHAO
Keyword(s):  
Fracture Toughness ◽  
Elastic Modulus ◽  
Surface Energy ◽  
Size Effects ◽  
Interatomic Potential ◽  
Effective Elastic Modulus ◽  
Surface Effects ◽  
Surface Relaxation ◽  
Ideal Crystal ◽  
Size Dependent

The effective elastic modulus and fracture toughness of the nanofilm were derived with the surface relaxation and the surface energy taken into consideration by means of the interatomic potential of an ideal crystal. The size effects of the effective elastic modulus and fracture toughness were discussed when the thickness of the nanofilm was reduced. And the dependence of the size effects on the surface relaxation and surface energy was also analyzed.

High entropic coatings FeCrNiTiZrAl and their properties

2021 ◽  
Vol 103 (3) ◽  
pp. 101-114
Author(s):  
V.M. Yurov ◽  
◽  
A.T. Berdibekov ◽  
N.A. Belgibekov ◽  
K.M. Makhanov ◽  
...  
Keyword(s):  
Surface Layer ◽  
Surface Energy ◽  
Metallic Glasses ◽  
High Hardness ◽  
High Entropy Alloy ◽  
Low Friction ◽  
High Entropy ◽  
Order Of Magnitude ◽  
Metal Products ◽  
Complex Crystals

In our proposed empirical model, the anisotropy of the surface energy and the thickness of the surface layer of the high-entropy FeCrNiTiZrAl alloy are calculated. The thickness of the surface layer of this alloy is about 2 nm, which is an order of magnitude greater than the thickness of the surface layer of complex crystals, but is of the same order of magnitude as that of metallic glasses. The hardness and other properties of the high-entropy alloy are the same as for metallic glasses, but are 2-3 times higher than the hardness of stainless steels. The surface energy of the high-entropy FeCrNiTiZrAl alloy is about 2 J/m2, which corresponds to the surface energy of magnesium oxide and other crystals with a high melting point. However, unlike these crystals, the friction coefficients of a high-entropy alloy (~ 0.06) are much lower than that of ordinary steels (~ 0.8). We have theoretically shown that the friction coefficient is proportionally dependent on the surface energy and inversely proportional to the Gibbs energy, which significantly decreases for a high-entropy alloy, leading to low friction. The high hardness and low coefficient of friction of the high-entropy alloy facilitates the deposition of coatings from them on structural metal products, which contributes to their widespread use.

Size Effects in Micro Forming

2011 ◽  
Vol 473 ◽  
pp. 3-12 ◽  
Author(s):  
Frank Vollertsen
Keyword(s):  
Surface Energy ◽  
Temperature Dependence ◽  
Size Effects ◽  
Deep Drawing ◽  
Forming Limit Diagram ◽  
Density Effect ◽  
Forming Limit ◽  
Shape Effect ◽  
Micro Forming ◽  
Forming Process

Size effects are effects which might occur, if the dimensions of a forming process are scaled up or down. They might enable or disable the application of a process in the micro range. Based on the systematic order of size effects, which defines density, shape and structure effects, one example for each group is given. A density effect, which occurs in Tiffany structures, explains the changes in forming behavior of foils with respect to the forming limit diagram. The feasibility of a new heading process only in the micro range is due to a shape effect, driven by the surface energy. The changes in the tribology in deep drawing by a structure effect, known as closed an open lubricant pocket model, can be explained only if one takes the temperature dependence of the viscosity of the lubricant into account.

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