Materials Literature
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HOMO–LUMO and optical gaps of (CdSe) <sub>n</sub> nanocrystals appear to have controversial magnitudes and size dependence, which we have rationalized.
Rare earth doping of Co-rich spinel ferrites is investigated through the preparation of two groups of polycrystalline Ni-Co and Ni-Co-Zn ferrites, where Fe is partly substituted by Y and La. The characterization of the sintered ferrites by means of X-ray powder diffraction and Rietveld profile analysis, indicates the…
A new, flexible, gas barrier material has been synthesized by exfoliating organically modified nano-clays (MMT) in the blends of Surlyn (PEMA) using a copolymer of vinyl alcohol (EVOH) and demonstrated as a gas barrier material. The materials were characterized by Fourier transform infra red (FTIR) and UV-visible spec…
A method for performing simultaneous measurements of the electrical resistivity and the Seebeck coefficient at high pressure and high temperature (HPHT) in cubic multi-anvil apparatus is described. For high pressure and high temperature measurements, a four-probe arrangement is used to measure the electrical resistivi…
A facile phosphine-free approach is presented to prepare Cu doped ternary Zn-In-Se nanocrystals with high performance photoluminescence. By doping during nucleation stage, Cu dopant serving as a dominative emission centre was introduced into a weak fluorescence ternary system to modify the emission path. As a result o…
Lanthanum tungstates, "La6WO12", are mixed ion proton-electronic conductors with very interesting properties for technological applications and better phase stability compared to alkaline earth perovskites. A new series of compounds La(27.04-x)M(x)W(4.96)O(55.44-x/2□8.56+x/2) (M = Ca(2+), Sr(2+) and Ba(2+)) are invest…
The dendrimer PAMAM has an amide resonance structure, <italic>i.e.</italic> imidic acid (HO–CN), and a tertiary ammonium structure, which can be characterized using <sup>15</sup> N/ <sup>1</sup> H/2D NH/ <sup>13</sup> C NMR, IR and MS.
Disulfide-linked covalent organic polymers (COPs) were prepared through catalyst-free oxidative coupling polymerization. Owing to the excellent swelling behavior, low cost, and efficient synthesis, these materials can be promising materials for removal of organics in concentrated streams. COPs show 1,4-dioxane uptake…
We study paramagnetic Ho(3+) centers in CaWO4, a promising material for applications in quantum electronics and quantum information devices. Oriented single crystals with nominal holmium concentrations 0.05, 0.5, and 1 at% were investigated at 4.2 K using EPR spectroscopy in the frequency range 37-850 GHz at temperatu…
The migration of vacancies between graphene layers and carbon nanotube walls has been observed in experiments, in which it is well known that the migration of vacancies between adjacent layers is prohibited by a very large energy barrier (∼7.0 eV). This contradiction has been a major puzzle for a number of years. In t…
Multifunctional dendrimers with fluorescent molecules at the core light up cell compartments upon uptake.
Exposure tests were performed on low alloy steels in a tropical environment, and the structure and electrochemical behavior of the rust were analyzed by TEM (Transmission Electron Microscopy) and EIS (Electrochemical Impedance Spectroscopy). In the exposure test, chloride ion from the sea was found to be the dominant…
Ultraviolet photoconductivity in Gallium doped ZnO (GZO) thin film synthesized by sol-gel technique is investigated. Response characteristics of Pure ZnO thin film and GZO thin film UV photodetector biased at 5 V for UV radiation of λ = 365 nm and intensity = 24 μwatt/cm2 have been studied. GZO UV photodetector is fou…
Derivatives of RGD peptide, such as N ? -Pbf-l-Arg-Gly-l-Asp(OAlk) 2 (Alk = Me or Bu t ), which contain glutaric acid moiety as a linker, were synthesized and immobilized to Fe3O4 magnetic nanoparticles obtained by gas condensation method.
Transient changes in the contact angle, Δθ ∼ 10°, of water on gold (Au) reveal reversible wetting of near hydrophobic Au films. The recovery time is temperature dependent. Surface flatness is investigated using AFM and profilometery.
Fission products and minor actinides arising from spent fuel reprocessing are immobilized in a borosilicate matrix known as high level nuclear waste glass (i.e. HLW glass). Glass packages are intended eventually for disposal in a geological repository. The long-term behavior of HLW glass subjected to radiation by long…
A new method to prepare ordered mesoporous carbon (OMC) hollow fiber membranes through a confined soft templating route is developed. The gas permeance results indicate that the OMC hollow fiber membranes exhibit Knudsen diffusion behavior confirming their good quality.
Using PEGylated nanoparticles and light-sensitive azobenzenes, a multicolor fluorescence layer-by-layer film loading drug has been constructed based on hydrogen bonding. The multilayer film exhibited multi-responsive drug release properties.
A supramolecular side-chain liquid crystalline (LC) polymer P4VP(1)x was prepared using poly(4-vinylpyridine) and a tolane based hemi-phasmid benzoic acid. P4VP(1)x exhibits good processability, forming smectic and hexagonal columnar LC phases at different compositions. Its photoluminescence properties depend on the L…
CuInS <sub>2</sub> nanocrystals with different phase structures were synthesized by a facile heat-up method through simply adjusting the OA dosage. This is because a high OA dosage could facilitate the formation and crystallization of the CuIn(SR) <sub>x</sub> intermediate, giving a metastable wurtzite CuInS <sub>2</s…