Materials Literature
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Single crystals of ammonium lead iodide, NH 4 PbI 3 , have been obtained by solid-state reactions. Each Pb II ion is coordinated by six I − ions in a distorted octahedral environment. PbI 6 octahedra are connected by common edges, forming a one-dimensional anion chain. All atoms except one H atom in a general position…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTControlled Thioacyl Group Transfer (TAGT) Polymerization of Cyclic Sulfide: Novel Approach to AB Diblock Copolymers by the Combination of RAFT and TAGT PolymerizationsAtsushi Nagai, Naoyuki Koike, Hiroto Kudo, and Tadatomi Nishikubo…
Transition metal (Mn and Ni) doped ZnO nanocrystals with a diameter of 20 nm were fabricated by a low temperature solution processing technique. The incorporation of Ni and Mn into the ZnO lattice is evidenced by the shrinkage or expansion of the lattice parameters of ZnO in response to the transition metal dopants as…
The properties of ices Ih, II, III, V, and VI at zero temperature and pressure are determined by computer simulation for several rigid water models (SPC/E, TIP5P, TIP4P/Ice, and TIP4P/2005). The energies of the different ices at zero temperature and pressure (relative to the ice II energy) are compared to the experime…
We report a systematic first-principles study of structural properties, electronic structures and magnetic properties of Cr doped ZnTe with the Cr concentration up to 0.5. We fully optimize all the structures concerned, both ferromagnetic and antiferromagnetic, and their internal atomic positions. Our calculations sho…
The structural phase transition of SrTiO3 at 105 K, which has been believed to be independent of the ferroelectric soft mode [Phys. Rev. 177, 858 (1969)], is shown, on the contrary, to be driven by the same long-wavelength polar instability. Isotope replacement of 16O by 18O is predicted to cause an increase in the st…
Recent studies identified and established a platform of polymer surface modifications allowing the attachment of penicillin (PEN) to expanded poly(tetrafluoroethylene) (ePTFE) surfaces. The effectiveness of this approach was accomplished by creating surfaces with chemically attached PEN that prevent the proliferation…
The thermal conductivity of an individual single-walled carbon nanotube is calculated with the analysis of all possible combining and splitting umklapp scattering processes based on complete phonon dispersion relations. The relaxation rate for the transverse acoustic phonons that undergo the combination umpklapp proce…
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…