Optoelectronic and photocatalytic applications of hBP–XMY (M = Mo, W; (X ≠ Y) = S, Se, Te) van der Waals heterostructures

2020 ◽  
Vol 22 (40) ◽  
pp. 23028-23037
Author(s):  
Tahani A. Alrebdi ◽  
B. Amin
Keyword(s):  
Physical Properties ◽  
Van Der Waals ◽  
Van Der Waals Interactions ◽  
Van Der Waals Heterostructures ◽  
Electronic Products ◽  
Photocatalytic Applications

Stacking of layers via weak van der Waals interactions is an important technique for tuning the physical properties and designing viable electronic products.

On the Forces Between Micro and Nano Objects and a Gripper

2012 ◽  
Vol 2 (2) ◽  
pp. 15-33 ◽  
Author(s):  
Galin Valchev ◽  
Daniel Dantchev ◽  
Kostadin Kostadinov
Keyword(s):  
Liquid Phase ◽  
Physical Properties ◽  
Van Der Waals ◽  
Van Der Waals Force ◽  
Van Der Waals Interactions

The authors study the van der Waals force, between the gripper jaw and an object – cubical, spherical and conical in shape, situated at a distance L of closest approach from it. The generic and most general case is considered, when the materials of the working jaw of the gripper and the particle are made of different materials strongly preferring the liquid phase of the fluid being at temperature T and chemical potentialm. The contributions due to the standard van der Waals, as well as of the retarded (Casimir) van der Waals interactions are considered. They concluded that strongly depends on the contrast, at given fixed T and m, between the physical properties of the fluid and the material of the arms of the gripper and the particle. In addition, as expected, strongly depends on the shape of the object, its size, and the distance L between it and the working jaw of the gripper. Their approach can be applied to any nonpolar fluid.

scholarly journals Exotic Physical Properties of 2D Materials Modulated by Moiré Superlattices

2021 ◽  
Author(s):  
Beibei Shi ◽  
Pengfei Qi ◽  
Meiling Jiang ◽  
Yuchen Dai ◽  
Feng Lin ◽  
...  
Keyword(s):  
Physical Properties ◽  
2D Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Van Der Waals Heterostructures ◽  
Moire Pattern ◽  
Moiré Pattern ◽  
Two Dimensional Materials ◽  
Quantum Phenomena

Van der Waals heterostructures of two-dimensional materials are naturally endowed with the nanoscale moiré pattern, which has become a versatile platform for studying novel quantum phenomena during past decades. Here,...

A Comparative Study of Un-Modified and Modified Acrylate-SiO2 Nanocomposites

MRS Advances ◽  
2017 ◽  
Vol 2 (49) ◽  
pp. 2737-2743
Author(s):  
Mireya L. Hernández-Vargas ◽  
Rubén Castillo-Perez ◽  
Oscar Hernández-Guerrero ◽  
Bernardo F. Campillo-Illanes ◽  
Osvaldo Flores-Cedillo
Keyword(s):  
Physical Properties ◽  
Van Der Waals ◽  
Chemical Properties ◽  
Class Ii ◽  
Decomposition Temperature ◽  
Van Der Waals Interactions ◽  
Class I ◽  
Covalent Bonds ◽  
Neat Polymer ◽  
Hybrid Compounds

ABSTRACTBased on the nature of the links and interactions existing at the hybrid interface, hybrid materials can be broadly classified in two main designations: a) Hybrid compounds Class I, that include all systems with electrostatic forces, hydrogen bonding or Van der Waals interactions and b) Hybrid compounds Class II, showing that the inorganic and organic components are linked through strong covalent or ionic-covalent bonds. The physico–chemical properties of nanostructured copolymer acrylates based on butyl acrylate (BA), methyl methacrylate (MMA) and acrylic acid (AA) has been investigated employing un-modified SiO2 (Class I) and modified SiO2 particles (Class II) using 3-(trimethoxysilyl) propyl methacrylate (MPS) as compatibilizing agent. The synthesis was carried out using seeded batch emulsion polymerization system. Metastable nanostructured emulsions containing 1 wt% nanoparticles were obtained. Films casted from the in-situ nanostructured latex exhibited excellent optical transparency suggesting good nanoparticles dispersion. However, the mechanical properties showed by SiO2-MPS nanocomposite, are better than the Class I hybrid compounds. Therefore, SiO2-MPS surface treatment prior to polymerization enhances the physical properties of copolymer BA-MMA-AA film. The mass loss derivative traces for the polyacrylic nanocomposites and the neat polymer obtained by thermogravimetric analysis showed that the onset temperature for thermal decomposition was shifted towards a higher temperature than the neat polyacrylic, indicating the enhancement of thermal stability of the un-modified SiO2 nanocomposite. However, there is a decrease of 40°C in the decomposition temperature for the modified polyacrylic nanocomposite. The results obtained so far have shown that weak Van der Waals and H-bonding interactions may be sufficient to enable improvement of the physical properties of the acrylate nanocomposites.

Effects of Se substitution and transition metal doping on the electronic and magnetic properties of a MoSxSe2−x/h-BN heterostructure

2019 ◽  
Vol 21 (36) ◽  
pp. 20073-20082 ◽  
Author(s):  
Fei-Fei Yu ◽  
Sha-Sha Ke ◽  
Shan-Shan Guan ◽  
Hong-Xiang Deng ◽  
Yong Guo ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Transition Metal ◽  
Physical Properties ◽  
Van Der Waals ◽  
Transition Metal Doping ◽  
Metal Doping ◽  
Van Der Waals Heterostructures ◽  
Electronic And Magnetic Properties ◽  
Se Substitution

The van der Waals heterostructures created by stacking two monolayer semiconductors have been rapidly developed experimentally and exhibit various unique physical properties.

On the Forces between Micro and Nano Objects and a Gripper

2014 ◽  
pp. 612-628
Author(s):  
Galin Valchev ◽  
Daniel Dantchev ◽  
Kostadin Kostadinov
Keyword(s):  
Liquid Phase ◽  
Physical Properties ◽  
Van Der Waals ◽  
Van Der Waals Force ◽  
Van Der Waals Interactions

The authors study the van der Waals force FvdW, between the gripper jaw and an object – cubical, spherical and conical in shape, situated at a distance L of closest approach from it. The generic and most general case is considered, when the materials of the working jaw of the gripper and the particle are made of different materials strongly preferring the liquid phase of the fluid being at temperature T and chemical potentialm. The contributions due to the standard van der Waals, as well as of the retarded (Casimir) van der Waals interactions are considered. They concluded that FvdW strongly depends on the contrast, at given fixed T and m, between the physical properties of the fluid and the material of the arms of the gripper and the particle. In addition, as expected, FvdW strongly depends on the shape of the object, its size, and the distance L between it and the working jaw of the gripper. Their approach can be applied to any nonpolar fluid.

Crystal Structures of Two New Cyclosporin Clathrates

2000 ◽  
Vol 65 (12) ◽  
pp. 1950-1958 ◽  
Author(s):  
Michal Hušák ◽  
Bohumil Kratochvíl ◽  
Ivana Císařová ◽  
Alexandr Jegorov
Keyword(s):  
Crystal Structures ◽  
Methyl Ether ◽  
Van Der Waals ◽  
Van Der Waals Interactions ◽  
Solvent Molecules ◽  
Butyl Methyl Ether

Two isomorphous clathrates formed by dihydrocyclosporin A or cyclosporin V with tert-butyl methyl ether are reported and compared with the structures of related P21-symmetry cyclosporin clathrates. The cyclosporin molecules in both structures are associated via van der Waals interactions forming cavities occupied by solvent molecules (cyclosporin : tert-butyl methyl ether is 1 : 2).

scholarly journals In situ nanoscale imaging of moiré superlattices in twisted van der Waals heterostructures

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yue Luo ◽  
Rebecca Engelke ◽  
Marios Mattheakis ◽  
Michele Tamagnone ◽  
Stephen Carr ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Heterostructures ◽  
Nanoscale Imaging

scholarly journals Light Absorption and Emission Dominated by Trions in the Type-I van der Waals Heterostructures

ACS Photonics ◽  
2021 ◽  
Author(s):  
Hyemin Bae ◽  
Suk Hyun Kim ◽  
Seungmin Lee ◽  
Minji Noh ◽  
Ouri Karni ◽  
...  
Keyword(s):  
Light Absorption ◽  
Van Der Waals ◽  
Type I ◽  
Van Der Waals Heterostructures ◽  
Absorption And Emission
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