scholarly journals Freeze Casting: From Low‐Dimensional Building Blocks to Aligned Porous Structures—A Review of Novel Materials, Methods, and Applications

2020 ◽  
Vol 32 (17) ◽  
pp. 1907176 ◽  
Author(s):  
Gaofeng Shao ◽  
Dorian A. H. Hanaor ◽  
Xiaodong Shen ◽  
Aleksander Gurlo
Keyword(s):  
Building Blocks ◽  
Porous Structures ◽  
Freeze Casting ◽  
Novel Materials ◽  
Low Dimensional

scholarly journals Cwebs beyond three loops in multiparton amplitudes

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Neelima Agarwal ◽  
Lorenzo Magnea ◽  
Sourav Pal ◽  
Anurag Tripathi
Keyword(s):  
Gauge Theories ◽  
Anomalous Dimension ◽  
Wilson Line ◽  
Building Blocks ◽  
Feynman Diagrams ◽  
Loop Order ◽  
Abelian Gauge ◽  
Sum Rule ◽  
Combinatorial Properties ◽  
Low Dimensional

Abstract Correlators of Wilson-line operators in non-abelian gauge theories are known to exponentiate, and their logarithms can be organised in terms of collections of Feynman diagrams called webs. In [1] we introduced the concept of Cweb, or correlator web, which is a set of skeleton diagrams built with connected gluon correlators, and we computed the mixing matrices for all Cwebs connecting four or five Wilson lines at four loops. Here we complete the evaluation of four-loop mixing matrices, presenting the results for all Cwebs connecting two and three Wilson lines. We observe that the conjuctured column sum rule is obeyed by all the mixing matrices that appear at four-loops. We also show how low-dimensional mixing matrices can be uniquely determined from their known combinatorial properties, and provide some all-order results for selected classes of mixing matrices. Our results complete the required colour building blocks for the calculation of the soft anomalous dimension matrix at four-loop order.

scholarly journals In(Ga)N Nanostructures and Devices Grown by Molecular Beam Epitaxy and Metal-Assisted Photochemical Etching

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 126
Author(s):  
Abdul Kareem K. Soopy ◽  
Zhaonan Li ◽  
Tianyi Tang ◽  
Jiaqian Sun ◽  
Bo Xu ◽  
...  
Keyword(s):  
Molecular Beam Epitaxy ◽  
Gas Sensors ◽  
Molecular Beam ◽  
Light Emitting Diodes ◽  
Crystal Quality ◽  
Porous Structures ◽  
Light Emitting ◽  
Photochemical Etching ◽  
Recent Advances ◽  
Low Dimensional

This review summarizes the recent research on nitride nanostructures and their applications. We cover recent advances in the synthesis and growth of porous structures and low-dimensional nitride nanostructures via metal-assisted photochemical etching and molecular beam epitaxy. The growth of nitride materials on various substrates, which improves their crystal quality, doping efficiency, and flexibility of tuning performance, is discussed in detail. Furthermore, the recent development of In(Ga)N nanostructure applications (light-emitting diodes, lasers, and gas sensors) is presented. Finally, the challenges and directions in this field are addressed.

Solvothermal Syntheses, Crystal Structures of Two New Thioantimonates(III) of the Mn2(L)Sb2S5 Family with L = Diethylenetriamine and N-Methyl-1,3-Diaminopropane and a Study of the Magnetic Properties of Four Compounds of the Series

2004 ◽  
Vol 59 (8) ◽  
pp. 869-876 ◽  
Author(s):  
L. Engelke ◽  
R. Stähler ◽  
M. Schur ◽  
C. Näther ◽  
W. Bensch ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Elevated Temperatures ◽  
Exchange Interactions ◽  
Building Blocks ◽  
Monoclinic Space Group ◽  
Antiferromagnetic Materials ◽  
Distorted Octahedra ◽  
Secondary Building Units ◽  
Low Dimensional ◽  
New Compounds

AbstractThe two new compounds Mn2(L)Sb2S5 (L = diethylenetriamine = DIEN, N-methyl-1,3- diaminopropane = MDAP) were prepared under solvothermal conditions using the elements as starting materials. Both compounds crystallise in the monoclinic space group P21/c with the lattice parameters a=10.669(7), b=12.805(2), c=12.072(1)Å , β =115.786(7)°,V =1485.1(4) Å3 for L = DIEN and a = 10.1859(7), b = 12.7806(6), c = 12.1256(8)Å , β = 110.173(8)°, V = 1481.7(2) Å3 for L = MDAP and Z = 4. The primary building units are SbS3 pyramids, MnS6 and MnS4N2 distorted octahedra. These primary building blocks are interconnected to form Mn2Sb2S4 hetero-cubane units. The hetero-cubanes share common corners, edges and faces thus forming a second heterocubane. These secondary building units are joined to form layers within the (100) plane. The connection mode yields ellipsoidal pores within the layers. The amines are exclusively bound to one of the two crystallographically independent Mn2+ cations and they point into the pores and between the layers separating the layers from each other. The interlayer separation and the size of the pores depend on the sterical requirements of the amine incorporated into the network. A pronounced distortion of the MnS4N2 octahedron results from a significant elongation of one Mn-S distance from 2.866 Å (L = methylamine, MA) to 3.185 Å for L = MDAP. The magnetic susceptibility curves are typical for low-dimensional antiferromagnetic materials and the large negative values for the Weiss constant Θ indicate strong antiferromagnetic exchange interactions. The magnetic properties are significantly influenced by the change of the Mn-S bonds introduced by the different amines. The compounds decompose at elevated temperatures with a two step reaction for L = MA and ethylenediamine and in a one step reaction for the bidentate acting amine molecules.

scholarly journals Frontispiece: Metal Oxide Nanosheets as 2D Building Blocks for the Design of Novel Materials

2020 ◽  
Vol 26 (42) ◽  
Author(s):  
Melvin A. Timmerman ◽  
Rui Xia ◽  
Phu T. P. Le ◽  
Yang Wang ◽  
Johan E. Elshof
Keyword(s):  
Metal Oxide ◽  
Building Blocks ◽  
Novel Materials

The 1,2,3,5-ditelluradiazolyl [HCN2Te2] species. Theoretical characterizations of the cation, radical, and radical dimers

1996 ◽  
Vol 74 (6) ◽  
pp. 810-818 ◽  
Author(s):  
William M. Davis ◽  
John D. Goddard
Keyword(s):  
Ab Initio ◽  
Electron Correlation ◽  
Cation Radical ◽  
Building Blocks ◽  
Molecular Conductors ◽  
Face To Face ◽  
Hartree Fock ◽  
Symmetry Constraints ◽  
Moller Plesset ◽  
Low Dimensional

Dithia- and diselena-diazolyl radicals (HCN2E2 E = S, Se) and dimers are important building blocks in the design of low-dimensional molecular conductors. Research on the tellurium-based analogues is much rarer. This work reports the molecular and electronic structures of the cation, radical, and radical dimers of 1,2,3,5-ditelluradiazolyl using ab initio theory including electron correlation by Møller–Plesset perturbation theory up to partial fourth order (MP4SDQ). A face-to-face C2v dimer is predicted to be bound with respect to two radicals by approximately 18 kcal/mol. A C2h, dimer also has been studied and is ca. 2 kcal/mol less stable than the C2v conformer. Relaxing symmetry constraints on the dimers led to more energetically stable structures at the Hartree–Fock level but the C2v structure remains the most stable at a level of theory including electron correlation effects. The results for the Te compounds along with our earlier research on the S and Se analogues provide predictions for the geometries, vibrational frequencies, and ionization potentials for the Te species to assist in future experiments. Key words: tellurium, ab initio, ditelluradiazolyl, dimers, binding.

Fascinating World of Nanomaterials, Applications and Technology Hurdles in Commercial Production

2009 ◽  
Vol 1209 ◽  
Author(s):  
Shiva Hullavarad ◽  
Nilima Hullavarad
Keyword(s):  
Quantum Confinement ◽  
Building Blocks ◽  
Semiconductor Nanostructures ◽  
Commercial Production ◽  
Scientific Field ◽  
Bohr Radius ◽  
Semiconducting Nanowires ◽  
Size Dependent ◽  
Low Dimensional ◽  
De Broglie Wavelength

AbstractNanoparticles, nanowires, nanorods and other kinds of nanostructures have been of great interest to scientific field. Semiconducting nanowires have attracted much attention due to the fact that reduced dimensional confinement of electrons, holes and photons make them particularly attractive as potential building blocks for nanoscale optoelectronic devices, highly quantum efficient lasers and non-linear optical converters. It is generally accepted that the low dimensional structures (where the size in one direction is equivalent to or smaller than the de Broglie wavelength) are useful materials for investigating the dependence of electrical and thermal transport or mechanical properties on the dimensionality and quantum confinement. Nanomaterials also play an important role as functional units in fabricating the electromechanical devices. Semiconductor nanostructures of different materials and shapes are investigated due to their size dependent electronic properties observable at dimensions comparable to or less than Bohr radius of exciton in these materials. Especially various oxides and sulphides have generated interests in variety of applications. In this paper, the recent progress in various nanostructures, paradigms in implementation and technology hurdles in implementing nanostructures are discussed

Precisely Designed Gold Nanoparticles by Surface Polymerization - Artificial Molecules as Building Blocks for Novel Materials

2011 ◽  
Vol 21 (19) ◽  
pp. 3753-3759 ◽  
Author(s):  
Stefan Bokern ◽  
Katharina Gries ◽  
Hans-Helmut Görtz ◽  
Volker Warzelhan ◽  
Seema Agarwal ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Building Blocks ◽  
Surface Polymerization ◽  
Novel Materials

scholarly journals Protein nanofibrils and their use as building blocks of sustainable materials

RSC Advances ◽  
2021 ◽  
Vol 11 (62) ◽  
pp. 39188-39215
Author(s):  
Christofer Lendel ◽  
Niclas Solin
Keyword(s):  
Sustainable Development ◽  
Renewable Resources ◽  
Building Blocks ◽  
Novel Materials ◽  
Sustainable Materials

Protein nanofibrils produced from renewable resources provide opportunities to create novel materials for sustainable development.

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