Materials Literature
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A brief review of the application of calorimetry to measurement of the kinetics of slow processes is presented. Processes degrading or otherwise changing the properties of materials often occur too slowly to be readily measured by conventional chemical analyses but can be measured in a relatively short period of time…
The new compounds [NBu 4 ][Cu(CN)X] (X = Br ( 1 ), I ( 2 )) and [NBu 4 ][Cu 3 (CN) 4 ]·CH 3 CN ( 3 ) have been prepared by reaction of [NBu 4 ]X with CuCN in acetone ( 1, 2 ) or acetonitrile ( 3 ), and have been characterized by X-ray crystallography and vibrational spectroscopy. Compounds 1 (C 34 H 72 Br 2 Cu 2 N 4,…
The synthesis of single-walled carbon nanotubes (SWNTs) in sooting flames is reported. This method offers a viable path towards low-cost large-scale synthesis, which is lacking in arc- and laser-based SWNT synthetic techniques. As with other methods, the growth of the SWNTs in the flame is catalyzed by the presence of…
The annealing effects of a dilute polyaniline solution on chemical and physical properties were investigated. Emeraldine base (EB) of polyaniline prepared by the conventional procedure was dissolved in 1-methyl-2-pyrrolidinone (NMP). After heating at 60−140 °C for 2 h, the color of PANi solution changed from deep blue…
Single-crystal magnetic susceptibility and specific heat studies of the one-dimensional copper complex [PM·Cu(NO 3 ) 2 ·(H 2 O) 2 ] n (PM = pyrimidine) show that it behaves like a uniform S = 1/2 antiferromagnetic Heisenberg chain, characterized by the exchange parameter J / k B = 36 K. Specific heat measurements in t…
Palladium nanoparticles dispersed on Al 2 O 3 were prepared via the sonochemical reduction of tetrachloropalladate(II) (Pd(II)) in an aqueous solution. The reduction of Pd(II) to metallic Pd successfully proceeded, even in the presence of Al 2 O 3 powder, by ultrasonic irradiation at 200 kHz. The rates of Pd(II) reduc…
Conformational changes of proteins adsorbing on biomaterial surfaces affect biocompatibility. Titanium is among the most successful biomaterials; however, the mechanisms leading to its biocompatibility are not yet understood. The primary objective of this study was to investigate the conformation of human plasma fibri…
We report on low-temperature photoconductivity (PC) in n-PbTe(Ga) epitaxial films prepared by the hot-wall technique on <111>-BaF_2 substrates. Variation of the substrate temperature allowed us to change the resistivity of the films from 10^8 down to 10_{-2} Ohm x cm at 4.2 K. The resistivity reduction is associated w…
Surface glass transition temperature,, of monodisperse polystyrene (PS) films was determined from the temperature dependence of lateral force at a given scanning rate. The end groups of the PS were composed of sec -butyl group and a repeating unit terminated by proton. of the PS films was discerned to be markedly lowe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLayered, Erasable, Ultrathin Polymer FilmsSvetlana A. Sukhishvili and Steve GranickView Author Information Department of Materials Science and Engineering University of Illinois at Urbana-Champaign 104 South Goodwin Ave., Urbana, Illinois 61801 Cite this: J. Am. Chem.…
This paper addresses numerical simulation of damage and fracture in concrete from the impact and penetration of shaped charge jets. We have modeled the jet penetration process with CALE, a two dimensional arbitrary Lagrange Eulerian hydrocode. We have looked at several constitutive models ranging from simple pressure…
Five θ-type BETS salts [BETS = bis(ethylenedithio)tetraselenafulvalene], θ-BETS 2 RbCo(SCN) 4, θ-BETS 2 RbZn(SCN) 4, θ-BETS 2 CsCo(SCN) 4, θ-BETS 2 CsZn(SCN) 4, and θ-BETS 2 Ag(CN) 2, have been newly prepared by the electrocrystallization method. The crystal structure analyses indicate that the former four salts are i…
Regioregular polymers poly(3-alkyl-2,5-thienylene- alt -1,4-phenylene) (PBTC n, n = 4, 8, 12) and poly[1,4-bis(3-alkyl-2-thienyl)phenylene] (PBTBC n, n = 4, 8, 12), which contain alternating phenylene and substituted thienylene or bithienylene repeating units, have been chemically and/or electrochemically synthesized…
The synthesis, characterization, absorption, and emission spectra of MoSe2 and WSe2 nanoclusters are reported. These nanoclusters are about 3.5−6 nm (MoSe2, see graphic) and 4−7 nm (WSe2) in diameter, as measured by TEM imaging. The particles are strongly quantum confined and highly anisotropic. Electron diffraction r…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of a New Hyperbranched Poly(silylenevinylene) with Ethynyl FunctionalizationYingxin Xiao, Richard A. Wong, and David Y. SonView Author Information Department of Chemistry, P.O. Box 750314, Southern Methodist University, Da…
Nitrogenous bases have commonly been employed as axial ligands for metalloporphyrins in biomimetic model compounds and catalytic oxygenation chemistry. The addition of bases such as pyridines or imidazoles to metalloporphyrin-catalyzed hydrocarbon oxidation reactions is known to affect catalyst selectivity and turnove…
Fluoro-terminated hyperbranched poly(ether ketone)s (FHBPEKs) with controlled degrees of branching and their linear analogous poly(ether ketone) (LPEK) whose chemical structure and molecular weights were similar to those of FHBPEKs were synthesized and characterized. Depending on the amount of the core molecules, degr…
The generation of superbase sites by doped alkali metals (Li, Na, and K) on alkaline earth metal oxides (MgO, CaO, SrO, and BaO) has been examined. In catalytic activity for the double bond migration of 4,4-dimethyl-1-pentene and 2,3-dimethyl-1-butene, a large increase in the generation of superbase sites was observed…
The thyminylmethyl radical and the 2‘-deoxyuridin-1‘-yl radical were studied. The former radical was produced in laser flash photolysis (LFP) studies from two precursors derived from thyminylacetic acid, the N -hydroxypyridine-2-thione ester (PTOC ester), and the phenylselenyl ester. The thyminylmethyl radical has an…
Two triazole derivatives were synthesized, and their inhibiting ability for scaling and corrosion process was checked using various electrochemical techniques. Potentiodynamic polarization studies clearly reveal the fact that triazole derivatives are good mixed-type inhibitors. Electrochemical impedance spectroscopy m…