Materials Literature
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We present direct laser writing of channels in chalcogenide glass under light filamentation conditions. Because of the intrinsic properties of the filament, the positive refractive index profile of the channels exhibits a cylindrical symmetry of high quality. The role of the repetition rate is also investigated. It is…
This paper reports on the synthesis and the thermal and optical properties of photochromic low-molecular-weight compounds, especially with respect to the formation of holographic volume gratings in the pure materials and in binary blends with polystyrene. Its aim is to provide a basic understanding of the holographic…
Electrostatic properties of two-dimensional nanosystems can be completely described by their non-trivial geometry modes. In this paper we prove that these modes as well as the corresponding eigenvalues are invariant under any conformal transformation. This invariance suggests a new way to study electrostatic conformal…
In the present article, for the first time, we report the synthesis of alkyl esters by direct esterification of alkali metal salts of carboxylic acids using carbon dioxide and alcohol. Methyl acetate, methyl benzoate, methyl salicylate, and methyl lactate have been synthesized by esterification of sodium acetate, sodi…
Abstract Four covalently linked trichromophore systems containing a central boron dipyrromethene (BODIPY) unit connected to a porphyrin unit through the 3‐position and a core‐modified porphyrin or a porphyrin expanded through the 5‐position were synthesized by treating 3‐bromo‐5‐porphyrinyl BODIPY or 3‐bromo‐5‐rubyrin…
The main objective of this work is to design an efficient catalyst for the synthesis of multiwalled carbon nanotubes (MWNTs) in our scalable, high quality with gram amount synthesis. The catalysts with composition of Fe, Mo, and MgO in the molar ratios 1:0.5:13, 1:1:13, and 1:1:50 were prepared by combustion method. T…
We analyze the deformation of the potential energy surface (PES) due to the incorrect description of fractional electron systems (the nonlinearity of the energy with electron number) within a (semi)local density functional theory (DFT). Particularly sensitive to this failure are polaronic systems where charge localiza…
This paper reports the design, fabrication and testing of a three-dimensional zinc–air microbattery with improved areal energy density and areal capacity, particularly at high discharge rates. The device is based on a multilayer, micron-scale, low-resistance metallic skeleton with an improved surface area. This skelet…
A novel thin-layer cellulose adsorbent bearing chemically immobilized thiosemicarbaside is synthesized. The adsorbent is used for the preconcentration of cobalt(II), mercury(II), and cadmium(II) followed by their X-ray fluorescence quantification in the concentrate. The physicochemical parameters of metal sorption are…
AzoTAB, a photosensitive azobenzene cationic surfactant, which phototriggers translation activity through light-regulated condensation of mRNA, is added to a translation solution containing several mRNAs, which can be selectively silenced by specific small RNAs. We find that gene silencing by small RNAs remains functi…
Size-controlled Si nanocrystals (nc's) of ∼ 2 to 5 nm diameter embedded in amorphous (a-)SiO2 are extensively studied by electron spin resonance (ESR) and photoluminescence (PL).The PL quenching P b -type (Si dangling bond) interface defects --P b(0) and P b1 centers--are investigated as a function of Si nc's size and…
The present paper studies MX crystals in rock-salt structure (M: Li, Na, K; X: F, Cl, Br, I). They are often described as being formed by ions. Pictures based on quantum mechanical calculations sustain and quantify it. The tools used are (i) the Quantum Theory of Atoms in Molecules, (ii) the Electron Localization Func…
From time immemorial, diamond attracted a special attention not only as a precious gemstone but also as an application material due to its unique and unsurpassed properties. Interest in diamond thin film research has enormously increased owing to the fact that most of the diamond properties could be utilized for vario…
Wellenreiten: Ein Aldehyd löst die orientierte Kristallisation selbstorganisierender fibröser Diphenylalanin-Peptidnetzwerke über große Entfernungen aus (siehe Bild). Das Kristallwachstum ist selbstregelbar und wird wahrscheinlich kinetisch reguliert, was zu dreidimensionaler Beschränkung uniaxial orientierter Unterst…
SiO 2 -supported Au nanoparticles derived from sol were promoted with 0.04–7.4 wt % CeO 2 using two methods. The addition of Ce precursor was done directly to the Au sols before sol immobilization step (method A) or to the suspension of parent Au/SiO 2 (method B). Both preparation routes resulted in CeO 2 decoration o…
Finite zigzag single-walled carbon nanotubes (SWCNTs) of some nanometers in length and modified by a topological defect of the Stone–Wales type were investigated by density functional theory (DFT) computation. Geometric changes of the regular hexagonal reference structures as well as alterations of their energetic, ma…
Abstract This Letter reports the use of nanoporous anodic aluminium oxide (AAO) for reflective interferometric gas sensing. Gas detection is based on changes of the interference signal from AAO porous layer as a result of the specific adsorption of gas molecules on a metal coated surface. Two different metal coatings…
The main purpose of this study was to determine the impulse of a bubble on a solid surface or the amount of energy transmitted to the surface by the bubble. To do this, the results of previous numerical studies were used to derive a relationship between the speed of microjet and acoustic pressure amplitude. It was fou…
WAXS, DSC and AFM methods were employed to compare phase structures of the coatings obtained from waterborne polyurethane cationomers which had been synthesised in the reaction of some diisocyanates (MDI, IPDI, TDI and HDI) with polyoxyethylene glycols (M = 600 and 2,000) and butane1,4-diol or N-methyl- or N-butyldiet…
Morpholine is a typical six-membered saturated heterocycle with the molecular formula HN(CH 2 CH 2 ) 2 O. In this work, the conformations of Morpholine in liquid and adsorbed on the surface of gold nanoparticles were studied by means of Raman spectroscopy and theoretical calculations. Ab initio calculations indicate t…