Materials Literature
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Al-containing hydrogenated amorphous carbon (Al - C : H) films were deposited on silicon substrates using a mid frequency magnetron sputtering Al target in an argon and methane gas mixture. The composition, surface morphology, hardness and friction coefficient of the films were characterized using x-ray photoelectron…
Abstract The direct polycondensation of D , L ‐lactic acid in the absence and presence of different catalysts at various temperatures has been studied experimentally. Two types of reactions were carried out, one under closed conditions to estimate the equilibrium constant and the other under flow of nitrogen to estima…
Studies have been carried out on gel polymer electrolytes comprising poly methyl methacrylate (PMMA)-ethylene carbonate (EC)–propylene carbonate (PC)–salts, LiClO4, NaClO4 and (C2H5)4NClO4 (TEAClO4) with a view to using them as electrolytes in electrical double layer capacitors (EDLCs) based on activated charcoal powd…
Polystyrene (PS) brushes were prepared on oxide passivated silicon by the surface initiated polymerization (SIP) technique. From an AIBN-type free radical initiator, which was silanized and immobilized on silicon wafers, styrene brushes were directly polymerized and grafted from the surface. The formation of the initi…
The members of the CuMo1-xWxO4 series (0<or=x<0.1) undergo a first-order phase transition at normal pressure, which can be induced by temperature. The two allotropic forms exhibit two distinguishable colors, green for the high-temperature form (alpha) and brownish-red for the low temperature one (gamma), which opens u…
A site-selective controlled delivery system for controlled drug release is fabricated through the in situ assembly of stimuli-responsive ordered SBA-15 and magnetic particles. This approach is based on the formation of ordered mesoporous silica with magnetic particles formed from Fe(CO)5 via the surfactant-template so…
In this paper, we propose a modified wavevector (WV) model that takes account of the N-process relaxation time and second-order three-phonon process to predict the length dependence of the thermal conductivity of single-wall carbon nanotubes (SWNTs). The model is validated by length-dependent thermal conductivities of…
DFT calculations reveal the unusual ferromagnetic exchange observed in an oxo-centered Mn(III) triangle may originate from a combination of the 'non-planarity' of the bridging oxime ligands and the non-parallel alignment of the Jahn-Teller axes.
Novel silsesquioxane-cross-linked porous nanocomposites with densities of around 1.5 × 10 2 kg/m 3 were synthesized within high internal phase emulsions (HIPE) in which 2-ethylhexyl acrylate (EHA) was cross-linked and reinforced with vinyl silsesquioxane (VSQ). The molecular structure, porous structure, thermal proper…
A scanning thermal microscope (SThM) in the dc regime was used to study the thermal conductivity of homogeneous in-depth meso-porous silicon in the form of thin films on a monocrystalline silicon substrate. Measurements for different film porosities (30–80%) and thicknesses (100 nm–8 µm) were performed in order to est…
A unique porous polymeric film was prepared by drying a ternary polymer solution: a polystyrene (PS), polyethylene glycol (PEG), and toluene solution. Highly ordered micropores, ranging from 5 to 12 mum in diameter, were formed on the film surface, and the rim of each micropore was surrounded by a ring of PEG. The eff…
In this paper, we report the photoluminescence (PL) properties of porous ZnO nanotubes prepared by a two-step hydrothermal method. The nanotubes show a nearly homogeneous size of about 250 nm diameter, 50 nm wall thickness and 500 nm length. There are always some scattered nanoholes with sizes ranging from several ten…
A systematic density functional study of the adsorption and dissociation of O 2 on the (001) surface of several transition metal carbides (TCMs; TM = Ti, Zr, Hf, V, Nb, Ta, Mo) is presented. It is found that O 2 may adsorb molecularly on two different sites with similar adsorption energy. At these sites, either O 2 br…
Abstract A series of wholly aromatic PIs were prepared from a newly synthesized sulfur‐containing diamine and various aromatic dianhydrides via a two‐step polycondensation procedure. Flexible and tough PI films were cast from their soluble PAA precursors. The PIs showed good thermal stability with 5% weight loss tempe…
We show in the case of a high-Peierls-stress Lomer dislocation in an aluminum crystal that the dependence of the kink-pair activation enthalpy on the stress obtained from static nudged elastic band method calculations agrees with that extracted from dynamical, constant strain-rate simulations. In order to perform the…
A resonance condition has been obtained for the position of plasmon peaks of any multipole order in the extinction spectra of silver and gold nanorods, as a function of their material, size, shape, and dielectric environment. The expression has been derived combining electrodynamics simulations with the aid of a nanoa…
The frequency-dependent dielectric relaxation of calcium-iron-antimonate $[\mathrm{Ca}({\mathrm{Fe}}_{1∕2}{\mathrm{Sb}}_{1∕2}){\mathrm{O}}_{3}]$ (CFS) ceramic, synthesized by a solid-state reaction technique is investigated in the temperature range from $143\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex…
Phonon-induced dephasing of electronic transitions in semiconducting single-wall carbon nanotubes (CNT) is investigated by ab initio molecular dynamics. Pure-dephasing is shown to be the source of the photoluminescence linewidths observed experimentally in isolated CNTs at low and room temperatures. In ideal tubes, th…
Two unique materials based on Mn4 single-molecule magnet (SMM) clusters (ST=9) and integer or non-integer average valent platinum maleonitriledithiolate (mnt2-) complexes, [{MnII2MnIII2(hmp)6(MeCN)2}{Pt(mnt)2}2][Pt(mnt)2]2.2MeCN (1) and [{MnII2MnIII2(hmp)6(MeCN)2}{Pt(mnt)2}4][Pt(mnt)2]2 (2), were synthesized by the ma…
We demonstrated a novel approach to produce robust bicontinuous nanoporous polymer membranes by ring-opening metathesis polymerization of a new norbornene-functional diblock copolymer and dicyclopentadiene followed by selective removal of a chemically etchable polylactide block. Polymerization-induced phase separation…