Materials Literature
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Abstract In this paper, we discuss some advanced theoretical aspects of electromagnetic enhancement factors (EFs) in surface‐enhanced Raman scattering (SERS). We focus in particular on the influence of surface selection rules (SSRs) on SERS EFs at hot spots, and the determination of SERS depolarization ratios. Both as…
Measurements of polarized neutron scattering were performed on a S=1/2 chain multiferroic LiCu2O2. In the ferroelectric ground state with the spontaneous polarization along the c axis, the existence of transverse spiral spin component in the bc plane was confirmed. When the direction of electric polarization is revers…
Reaction in water between rare earth ions (Ln = Y, La-Tm, except Pm) and the sodium salt of terephthalic acid leads to a family of lanthanide-based coordination polymers of general formula [Ln2(C8H4O4)3(H2O)4] n with Ln = La-Tm or Y. The isostructurality of the compounds with the previously reported Tb-containing poly…
Bulk ZnO samples, epitaxially grown ZnO layers, and ZnO nanostructures frequently exhibit a characteristic emission band at $3.31\text{\ensuremath{-}}\mathrm{eV}$ photon energy whose origin is controversially discussed in the literature. Partly, this omnipresent band is ascribed to $(e,{A}^{0})$ transitions of conduct…
By partially substituting the tri-valence element La with di-valence element Sr in LaOFeAs, we introduced holes into the system. For the first time, we successfully synthesized the hole-doped new superconductors (La 1- x Sr x )OFeAs. The maximum superconducting transition temperature at about 25 K was observed at a do…
Abstract The mechanism of the photochemically induced nucleation of lysozyme was investigated. Radical cations and neutral radicals of tryptophan residue of lysozyme were observed by transient absorption measurements. The radical cation was found to be in equilibrium with the neutral radical, and the pKa of the radica…
The recognition properties of 7,8-dimethyl flavin analogues by bile acid-based receptors that contain 2,6-diaminopyridine and the dioctylamide of 2,6-diaminopyridine in CHCl3 were determined. The results show that the bile acid-based receptors bind 7,8-dimethyl flavin analogues less effectively as compared to 7,8-unsu…
A method of determining the physisorption energy of molecules on carbon nanostructures using field emission current fluctuation measurements is presented. A stochastic model, broken into birth and death processes, was applied to analyze the current fluctuation and determine the physisorption energy. This method yields…
Co-doping of yttrium doped mixed barium cerate/zirconate perovskite (BCZY) with small amounts of Pr (BCZYP) substantially increases electrical conductivity while retaining structural and chemical stability. BCZYP is pre- dominantly a proton conductor at temperatures up to 600-650˚C, whereas it is a mixed proton/oxide…
In multi-component soft matter, two microphase separated ordered phases such as lamellar and hexagonal phases coexist in equilibrium. We call such a macroscopic phase separation ‘order–order phase separation’. Based on a coarse grained single order parameter Ginzburg–Landau free energy, we investigate the dynamics of…
The influences of trapped charges on carrier transport in carbon nanotubes (CNTs) are studied using CNT field-effect transistors with a partial top-gate and a global back-gate. Trapped charges induced by the global back-gate voltage sweeping (± 20 V) promote the device from 'ON' states to near 'OFF' states at zero gat…
Zinc oxide (ZnO) thin films have been prepared by ultrasonic Spray Pyrolysis (USP) technique using zinc acetate dihydrate dissolved in methanol, ethanol and deionized water. A thermodynamic analysis for the growth of ZnO thin films from zinc acetate and water vapor has been made. The evolution of the preferred crystal…
The geometric structure and electronic structure of an imogolite nanotube have been studied using density functional theory (DFT). The calculation results indicate that the deformation of the material leads to structural electric charges on the tube wall. This hydrous aluminosilicate single-walled nanotube is a wide g…
The results of the application of shape memory alloy (SMA) prestressing devices on an aqueduct are presented in this paper. The aqueduct was built in 1747 to provide water to the city of Larnaca and to its port. Because of its importance to the cultural heritage of Cyprus, the aqueduct has been selected as one of the…
Coexistence of spontaneous ferroelectricity and weak ferromagnetism in Bi0.8Pb0.2FeO2.9 perovskite, Khomchenko, V A, Kiselev, D A, Vieira, J M, Rubinger, R M, Sobolev, N A, Kopcewicz, M, Shvartsman, V V, Borisov, P, Kleemann, W, Kholkin, A L
Abstract A nonautoclave vacuum bag process using atmospheric pressure alone that eliminates the need for external pressure supplied normally by an autoclave or a press is an attractive method for composite fabrication. This type of process does not require large capital expenditures for tooling and processing equipmen…
We report on a method to preferentially align multiwall carbon nanotubes (MWCNTs) in a liquid crystalline matrix to form stable composite thin films. The liquid crystalline monomeric chains can be crosslinked to form acrylate bridges, thereby retaining the nanotube alignment. Further post-treatment by ozone etching of…
The use of pre-tensioned shape memory alloy (SMA) wires to retrofit historic masonry structures is investigated. A small wall, serving as a prototype masonry specimen, is constructed to undergo a series of shaking-table tests. It is first studied in its original state, and its dynamic characteristics (in terms of moda…
We report novel phase behavior for a system of disclike ellipsoidal particles interacting via a pair potential. We identify a structural phase transition between two hexagonal columnar phases, both tilted, induced by spatial ordering of the tilt about the columnar axis and positional correlations between neighboring c…
The dynamics of ethylcyclohexane are investigated by high resolution dielectric spectroscopy aiming to characterize the relevant relaxational features of this simple system in its fluid, supercooled liquid, and glassy states. The dielectric signature of structural relaxation is a primary loss peak with amplitude Delta…