Materials Literature
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We investigate theoretically the size-dependence of two-photon absorption (TPA) for circular graphene quantum dots (GQDs) on the basis of electronic energy states obtained by solving the Dirac-Weyl equation analytically under infinite-mass boundary condition. The analytical expressions for TPA coefficient are derived…
By using scanning multiphoton microscopy we compare the nonlinear optical properties of the directly deposited and transferred to the dielectric substrate graphene. The direct deposition of graphene on oxidized silicon wafer was done by utilizing sacrificial copper catalyst film. We demonstrate that the directly depos…
Some perovskite oxides were prepared by the novel low-temperature synthesis using a powder mixture including hydroxides and transition oxide gels. Particularly, it was found that BaZrO3 and BaHfO3 could be obtained under 50 °C with a high crystallinity. From the results of synthesis, it was found that the products cry…
Abstract Yttrium addition can improve the oxidation resistance, mitigate hydrogen embrittlement and thus enhance the mechanical properties of the zirconium alloy. To study solid solubility extension of yttrium in zirconium alloy, the lattice parameters of α‐Zr phase in Zr–Y alloy were accurately determined by X‐ray di…
Ceramics with perovskite-type structure and 0.94(Bi0.5Na0.5)TiO3–0.06BaTiO3 (BNBT) composition have been studied by conventional powder X-ray diffraction in Bragg–Brentano geometry. Ceramics were obtained from sol–gel autocombustion nanopowders and processed either by hot pressing and subsequent recrystallisation or p…
Ab initio pseudopotential calculations have been performed to investigate the structural, electronic, and vibrational properties of ${\mathrm{SrPd}}_{2}{\mathrm{Ge}}_{2}, {\mathrm{SrPd}}_{2}{\mathrm{As}}_{2}$, and ${\mathrm{CaPd}}_{2}{\mathrm{As}}_{2}$ crystallizing in the ${\mathrm{ThCr}}_{2}{\mathrm{Si}}_{2}$-type b…
In this paper we describe the model of glide dislocation interaction with obstacles based on the planar curve dynamics. The dislocations are represented as smooth curves evolving in a slip plane according to the mean curvature motion law, and are mathematically described by the parametric approach. We enhance the para…
A challenge for the design of scaffolds in tissue engineering is to determine a terminal sterilization method that will retain the structural and biochemical properties of the materials. Since commonly used heat and ionizing energy-based sterilization methods have been shown to alter the material properties of protein…
Photovoltaic cells have been fabricated from p-GaN/MgO/n-ZnO structures. The photovoltaic cells are transparent to visible light and can transform ultraviolet irradiation into electrical signals. The efficiency of the photovoltaic cells is 0.025% under simulated AM 1.5 illumination conditions, while it can reach 0.46%…
Ga nanoparticles (GaNPs) produced by thermal evaporation or epitaxial methods on graphene sheets present strong plasmonic effects that can couple to graphene phonons. In this work, GaNPs are deposited on graphene monolayers supported on Cu, quartz, and SiO2/Si substrates. The use of graphene increases the interparticl…
Developing renewable resources for industrial applications, rather than using severely depleted natural fossil, is the biggest need of recent times. In this regard, rice straw (RS) has already been considered as an alternative material. However, some structural modifications need to be performed to make RS suitable fo…
Reaction of [Nb6O19](8-) with H6TeO6 in water gives telluropentaniobate [(OH)TeNb5O18](6-) (1) as single product, which was isolated as Na(+) and mixed Na(+)/K(+) salts. Crystal structures were determined for Na6[(OH)TeNb5O18]·15H2O (Na6-1) and K6Na[Nb(5.5){Te(OH)}(0.5)O(18.5)]·26H2O (K6Na-1). Formation of 1 was monit…
The contact of a steel electrode with water dispersion medium in an open-air system leads to the development of various polymorphic iron oxides and oxyhydroxides on the steel surface. Whereas the usage of distilled water causes the obtaining of Fe(II)-Fe(III) layered double hydroxides (green rust) as a primary mineral…
Abstract In continuation of our previous works on the application of (NH4)42[MoVI72MoV60O372(CH3COO)30(H2O)72], a Keplerate-type giant-ball nanoporous isopolyoxomolybdate, as a catalyst for a series of organic transformations, in this paper, we discovered that this new attractive catalyst has high catalytic activity i…
The solubilities of adipic acid in cyclohexanol + cyclohexanone mixtures from 303.0 to 353.0 K and in cyclohexanone + cyclohexane mixtures from 303.0 to 378.5 K were determined using a titration and an in situ ATR-FTIR method. The averaged relative deviation between two methods at given temperatures was less than 2%.…
We perform theoretical analysis of polarization-sensitive Raman spectroscopy on ${\mathrm{NaFe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{As}, \mathrm{EuFe}2{\mathrm{As}}_{2}, {\mathrm{SrFe}}_{2}{\mathrm{As}}_{2}$, and $\mathrm{Ba}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}){}_{2}{\mathrm{As}}_{2}$, focusing…
This work used L-tartaric acid as a model molecule to evaluate how the use of inert and oxidizing atmospheres during pyrolysis affected the physical and optical properties of the resulting carbon dots (CDs). Pyrolysis revealed to be a simple procedure that afforded CDs in a single step, dismissed the addition of organ…
This study employs computational reaction finding tools to probe the unique biphilic reactivity between ammonia-borane (AB) and CO2. The results show that sequential reactions involving multiple equivalents of AB and CO2 can lead to the formation of stable nonplanar B,C,N,O-heterocycles (Cy-BCN). Cy-BCN is shown to em…
${\text{Eu}}_{1\ensuremath{-}x}{\text{Ho}}_{x}{\text{MnO}}_{3}$ with $x<0.5$ has an orthorhombic perovskite structure, where the partial substitution of europium by holmium increases the orthorhombic distortion and changes the low-temperature magnetic structure from canted antiferromagnetic to the multiferroic ground…
The behaviors of large, dynamic assemblies of macroscopic particles are of direct relevance to geophysical and industrial processes and may also be used as easily studied analogs to micro- or nano-scale systems, or model systems for microbiological, zoological, and even anthropological phenomena. We study vibrated mix…