Materials Literature
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In semiconductors with inversion asymmetry, spin-orbit coupling gives rise to the well-known Dresselhaus and Rashba effects. If one considers quantum wells with two or more conduction subbands, an additional, intersubband-induced spin-orbit term appears whose strength is comparable to the Rashba coupling, and which re…
Based on the Ti-vacancy defect compensation model, (Ba1−xLnx)Zr0.2Ti0.8−x∕4O3 (Ln=La,Sm,Eu,Dy,Y) ceramics have been fabricated via the conventional solid-state reaction method. The microstructures, dielectric properties, and ferroelectric relaxor behavior of (Ba1−xLnx)Zr0.2Ti0.8−x∕4O3 ceramics have been investigated.…
We address the problem of an unscreened Coulomb charge in graphene and calculate the local density of states and displaced charge as a function of energy and distance from the impurity. This is done nonperturbatively in two different ways: (1) solving the problem exactly by studying numerically the tight-binding model…
Roll model: A new “shape-transformation” concept (see picture) that proceeds through a rolling out of 1D tungsten oxide nanorods for the fabrication of laterally confined 2D WS2 nanosheet crystals has been developed. The resulting 2D WS2 nanosheet crystals show a significantly enhanced discharge capacity for applicati…
A simple yet highly reproducible method to suppress contamination of graphene at low temperature inside the cryostat is presented. The method consists of applying a current of several milliamperes through the graphene device, which is here typically a few microns wide. This ultrahigh current density is shown to remove…
The manuscript reports experimental estimation of Cesium Chloride film's band gap and compares it with theoretical simulations. The band gap shows a strong dependence on it's lattice constant. Also, it is seen that the point defects present in the films strongly affects it's optical properties.
Abstract We demonstrate a new method through sol–gel processes for the preparation of patterned zirconia thin films by using directed self-assembly into patterns reflecting the phase-separated structures of mixed Langmuir–Blodgett films. Atomic force microscopy and Kelvin probe force microscopy images confirmed the fo…
Aliovalent K(0.92)In(0.46)Nb(0.54)OPO(4) (KINP, potassium indium niobium oxide phosphate) features a chain structure involving corner-sharing [MO(6)] octahedra (M = In/Nb), which allows this compound to be recognized as a member of the KTiOPO(4) (KTP) family. However, its crystallization in the polar space group P4(1)…
ZnO/TiO 2 nanohybrid structures have been synthesized by the simple method of the site-specific deposition of titanium oxide on ZnO nanorods. The polarity of the ZnO (0001) surface plays an important role in the formation of the nanohybrid structures. Using high-resolution transmission electron microscopy, we observed…
Conformational flexibility is emerging as a central theme in enzyme catalysis. Thus, identifying and characterizing enzyme dynamics are critical for understanding catalytic mechanisms. Herein, coupling analysis, which uses thermodynamic analysis to assess cooperativity and coupling between distal regions on an enzyme,…
Well-aligned ZnO nanorod and nanobolt arrays were synthesized on p-type Si(100) substrates by a simple physical vapor deposition method. During the growth process when the carrier gas was switched from Ar to air, the nanorods changed into nanobolts completely. The mechanism for this transformation process is discussed…
Abstract Au–Ag alloy nanoparticles with prismatic structure have been prepared in aqueous solution by photoinduced conversion of spherical Au–Ag alloy nanoparticles. All the particles have compositions close to those expected from the starting ratio of metal compounds. These nanoprisms showed pronounced catalytic acti…
New thiolytically cleavable dithiobenzyl (DTB) urethane-linked conjugates of methoxypoly(ethylene glycol) (mPEG) and a model protein, lysozyme, were prepared and thoroughly characterized. In contrast to our earlier communication [Zalipsky, et al. (1999) Bioconjugate Chem. 10, 703], in the current study we used a more…
Surface-initiated atom transfer radical polymerization (ATRP) of methoxypoly(ethylene glycol) methacrylate (MPEGMA) macromonomers from immobilized initiators leads to thin films of comblike polymer brushes. The aqueous ATRP procedure results in essentially constant film growth rates and yields coatings with thicknesse…
Organosilicon compounds can form novel electrolytes having a number of unusual properties, including high electrochemical stability, high thermal stability, and low viscosity. Vertically aligned carbon nanofibers can act as exceptionally good nanostructured electrodes, with the vertical orientation and presence of edg…
Poly{(+)-2,5-bis[4-(( S )-2-methylbutoxy)phenyl]styrene} (PMBPS) and its random copolymers with polystyrene were synthesized via atom transfer radical polymerization and conventional radical copolymerization, respectively. The dependences of thermotropic and chiroptical properties on the degrees of polymerization (DPs…
A size distribution of a binary mixture of polystyrene- block -poly(4-vinylpyridine) (PS−P4VP) diblock copolymer micelles was investigated mainly by transmission electron microscopy. A single-layered film of PS−P4VP micelles fabricated by spin-coating enabled a precise measurement of the micellar size. Depending on th…
The interfacial structures of the iPP/PET matrix/fiber composite systems prepared by introducing the PET fiber into the iPP melt or supercooled melt were studied via optical and scanning electron microscopies. We found that unlike the iPP matrix/fiber single polymer composites prepared in the same way, where homoepita…
A smart contrast agent for magnetic resonance imaging (MRI) can be used to exploit an enzymatic activity specific to the tissue or disease state signified by converting an MRI-inactivated agent to an activated MRI agent. In this study, a beta-galactopyranose-containing gadolinium(III) complex [Gd(DOTA-FPG)(H 2O)] was…
Quantum chemical calculations at the DFT level have been carried out for trans -[Ru II (NH 3 ) 4 (L)NO] q and trans -[Ru II (NH 3 ) 4 (L)NO] q -1 complexes, where L = NH 3, Cl -, and H 2 O. The equilibrium geometries and the vibrational frequencies are reported not only for the ground state (GS) but also for light-ind…