Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
An extraordinarily useful cluster to detail reaction pathways in water might have been obtained in form of [N(CH3)4]10[Ti12Nb6O44], a polyoxometalate with a central cavity. This compound is soluble in a range of solvents and has been characterized by ESI mass spectrometry and X-ray crystallography (see picture; [1]=[T…
Optical transmission range and phase matching (PM) conditions for second harmonic generation (SHG) of Er3+:YSGG and CO2 laser in indium doped GaSe:In(0.1, 1.23, 2.32 mass%) are studied in comparison with these in pure and sulfur doped GaSe:S(0.09, 0.5, 2.2, 3 mass%) crystals. No changes in transparency curve are found…
Two types of 32 arm star polymers incorporating amphiphilic block copolymer arms have been synthesized and characterized. The first type, stPCL-PEG 32, is composed of a polyamidoamine (PAMAM) dendrimer as the core with radiating arms having poly(epsilon-caprolactone) (PCL) as an inner lipophilic block in the arm and p…
Branched poly(ethylenimine) (PEI)-capped Au nanoparticles are prepared at room temperature using PEI as the reductant of hydrogen tetrachloroaurate (HAuCl4). The size of Au nanoparticles, ranging from 10 to 70 nm, is readily controlled by varying the relative amount of PEI used initially versus HAuCl4. The PEI-capped…
A newborn member of the porphyrin family, the porphyrin(1.0.1.0) called norcorrole (shown in the center of the picture), was detected as an unexpected product of a spontaneous oxidative macrocyclization reaction of the iodidoiron(III) complex of 2,2′-bidipyrrin. It fills a gap in the family of contracted porphyrinoid…
Commercial nanometer sized silver is widely used for its antibacterial effect; however, nanoparticles may also have ecotoxicological effects after being discharged into water. Nanometer sized silver can flow into aquatic environments, where it can exert a variety of physiologically effects in living organisms, includi…
Trivalent europium ions have been successfully incorporated in anatase TiO 2 nanocrystals via a sol−gel solvothermal synthesis, in spite of a large mismatch in ionic radius between Eu 3+ and Ti 4+ . The photoluminescence intensity of Eu 3+:TiO 2 nanocrystals has been significantly improved, which is comparable to that…
The complex mechanisms of protein adsorption at the solid-liquid interface is of great importance in many research areas, including protein purification, biocompatibility of medical implants, biosensing, and biofouling. The protein adsorption process depends crucially on both the nanoscale chemistry and topography of…
The distribution of moisture in state-of-the-art firefighter protective clothing was analyzed on a sweating torso. After one hour of sweating, only 35 % of moisture evaporated from the layers, but after another hour of drying out, only about 10 % of the supplied moisture remained in the clothing. Over 75 % of this moi…
A novel carbon composite structure consisiting of graphene multi-layers and aligned multi-walled carbon nanotubes (MWNTs) has been discovered. The composite structure, which was synthesized by chemical vapor deposition, has graphene multi-layers combined with the upper ends of vertically aligned MWNTs on a substrate.…
Possible superconductivity of electrons with the Dirac spectrum is analyzed using the BCS model. We calculate the critical temperature, the superconducting energy gap, and the supercurrent as functions of the doping level and of the pairing interaction strength. Zero doping is characterized by the existence of a quant…
The electronic and magnetic properties of cobalt-based layered oxypnictides, $\text{LaCoO}X(X=\text{P},\text{As})$, are investigated. LaCoOP and LaCoOAs show metallic type conduction with room-temperature resistivities of $\ensuremath{\sim}2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}\text{ }\ensuremath{\O…
We theoretically study the magnetoresistance of a CPP-GMR system with current confined paths (CCP) in the framework of Valet-Fert theory. The continuity equations for charge and spin currents are numerically solved with the three-dimensional CCP geometry by use of finite element method. It is confirmed that the MR rat…
A combination of synchrotron X-ray diffraction techniques have been applied to resolve ambiguities between experimental and theoretical studies of LiBH 4 and to reveal its complex structural evolution as a function of temperature. Crystal structures of the low- and high-temperature polymorphs of LiBH 4 have been deter…
We experimentally demonstrate a method for obtaining nuclear spin hyperpolarization, that is, polarization significantly in excess of that expected for a thermal equilibrium. By exploiting a modified Overhauser process, we obtain more than 68% nuclear anti-polarization of phosphorus donors in silicon. This polarizatio…
The goal of this work is to explore the effects of solution ionic strength and pH on polyelectrolyte multilayer (PEM) assembly, using biologically derived polysaccharides as the polyelectrolytes. We used the layer-by-layer (LBL) technique to assemble PEM of the polysaccharides heparin (a strong polyanion) and chitosan…
We report an electrochromic (EC) display using a viologen-modified ZnO nanowire array as the EC electrode. The ZnO nanowire array was grown directly on an indium tin oxide (ITO) glass by a low temperature aqueous thermal decomposition method and then modified with viologen molecules. The ZnO nanowire electrochromic de…
Micelles of a model amphiphilic block copolymer, poly(hydroxyethyl acrylate)-block-poly(n-butyl acrylate) (PHEA-b-PBA), synthesized via the RAFT polymerization were cross-linked by copolymerization of a degradable cross-linker from the living RAFT-end groups of PBA chains, yielding a cross-linked core without affectin…
We study the possibility of spin injection from Fe into Si(001), using the Schottky barrier at the Fe/Si contact as tunneling barrier. Our calculations are based on density-functional theory for the description of the electronic structure and on a Landauer-Buttiker approach for the current. The current-carrying states…
We present a qualitative model for a fundamental process in molecular electronics: the change in conductance upon bond breaking. In our model a diatomic molecule is attached to spin-polarized contacts. Employing a Hubbard Hamiltonian, electron interaction is neglected in the contacts and explicitly considered in the m…