Materials Literature
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A three-dimensional Landau theory of stress-induced martensitic phase transformations is presented. It describes transformations between austenite and martensitic variants and transformations between martensitic variants. The Landau free energy incorporates all temperature-dependent thermomechanical properties of both…
We present the structural and optical characterization of colloidal PbSe nanocrystals. The lowest-energy exciton transitions in these structures, with diameters between 3 and 8 nm, occur at wavelengths between 1.0 and 1.85 μm. Band-edge luminescence spectra with quantum yields as high as 80% are observed. Unexpectedly…
The crystal structure of chlorofluoromethane, CH(2)ClF, has been determined at 100 and 30 K using indexing, packing considerations and Rietveld refinement of neutron powder profiles. There is only one phase, in monoclinic space group P2(1) and with two molecules in the unit cell occupying general positions. The struct…
The title compound, SrZnCoFe(16)O(27) (ZnCo-W), strontium zinc cobalt hexadecairon oxide, crystallizes in space group P6(3)/mmc, with the Sr atom at a site with -6 m 2 symmetry and Zn(2+) located at two tetrahedral sites (4e and 4f, each with 3m symmetry) of the spinel blocks. The Zn occupancy is 36% on equipoint 4e a…
A simple, new TEM specimen holder to detect cathodoluminescence (CL) in a transmission electron microscope has been developed. This holder accommodates a flat light-collecting reflector below the specimen and CL signals are guided to an optical spectrometer outside of the microscope through a quartz optical fibre. The…
We introduce two new sulfur functionalised phosphines P(C6H4SMe)3L1 and PPh2C6H4SMe L2. Using them as ligands, four new copper selenium clusters were synthesized. The compounds [Cu15Se3(SePh)9(P(C6H4SMe)3)6] 1, [Cu22Se6(SePh)10(PPh2C6H4SMe)8] 2, [Cu20Se(SePh)12(OAc)6(PPh2C6H4SMe)2] 3 and [Cu38Se4(SePh)24(OAc)6(PPh2C6H…
Thin films of barium aluminate (BaAl 2 O) 4 ) doped separately with thulium, terbium, and europium were deposited by a spray pyrolysis method. The effects of preparation conditions on the structural and luminescence properties of the films were investigated. Polycrystalline BaAl 2 O 4 films were formed at an annealing…
The enzyme hydroxymethylbilane synthase (HMBS, EC 4.3.1.8), 313 amino acid residues and MW 34 kDa, also known as porphobilinogen deaminase (PBGD), catalyses the stepwise polymerization of four molecules of porphobilinogen (PBG) to the linear tetrapyrrole 1-hydroxymethylbilane. Several crystallographic structures of HM…
Protoporphyrin reacts with diazomethane to give pyrazolines which at long wavelength (approximately 630 nm) extrude nitrogen to give the corresponding cyclopropyl derivatives.
This study discusses the development of an atmospheric pressure glow discharge enhanced CVD system for the catalytic growth of carbon nanotubes (CNTs). He/H 2 /CH 4 (900 : 100 : 0–20 scc min −1 ) gas mixture was processed in the barrier discharge reactor operated at 760 Torr. Ni-coated (20 nm) quartz substrate was use…
Electrical conduction in non-conjugated insulating polymers such as Kapton (R) films was studied as a function of temperature, T (15–500 K) and electric field F (⩽16 kV cm −1 ). The time dependent isothermal transient currents (ITC) were also studied at different temperatures (15 K< T <500 K). Thermally stimulated dis…
The influence of temperature and hydrocarbon additives on NO x removal and CO production has been studied by numerical modelling and process experiments for a synthetic gas mixture consisting of N 2 , O 2 , H 2 O and CO 2 in a pulsed corona reactor. The NO reduction of more than 99% was achieved at the energy cost of…
Photoassisted selective catalytic reduction of NO with ammonia (photo-SCR) at low temperature over irradiated TiO2 in a flow reactor was confirmed to proceed efficiently and the adsorbed ammonia reacted with NO under irradiation of TiO2.
Monoacylated mesitylene is industrially an important precursor used in fine chemical and intermediate industries. The current processes use highly polluting and hazardous catalysts. In the current work, selective synthesis of 2‘,4‘,6‘-trimethyl acetophenone (monoacylated mesitylene) from 1,3,5-trimethyl benzene (mesit…
Nanocrystalline K 2 Ca 2 (SO 4 ) 3 : Eu prepared by a co-precipitation method has been studied for its thermoluminescence (TL) and photoluminescence (PL) characteristics. The TL glow curve of the compound has a simple structure with a prominent peak at 406 K and a small peak at 462 K. TL sensitivity of the phosphor is…
We introduce a statistical mechanical model for the physical properties of water. Each water molecule is a two-dimensional disk with three radial hydrogen-bonding arms. Energetic interactions are based on water triplets, a central water molecule interacting with two neighbors via hydrogen bonds, van der Waals attracti…
Because of the high global warming potential of SF 6 gas, research on alternative gases for electrical insulation with a lower environmental impact is essential. Gas mixtures composed of electronegative gases and N 2 gas have the advantage of the reduction of the amount of SF 6 gas and of utilizing the synergistic eff…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTPolyphophazene Containing Indole-Based Dual Chromophores: Synthesis and Nonlinear Optical CharacterizationZhen Li, Jingui Qin, Shaojun Li, Cheng Ye, Jie Luo, and Yong CaoView Author Information Department of Chemistry, Wuhan University, Wuhan 430072, China; Center for Molecular…
We present the development of both steady-state and dynamic models for a slurry HDPE process using fundamental chemical engineering principles and advanced software tools, Polymers Plus and Aspen Dynamics. The discussion includes thermodynamic properties, phase equilibrium, reaction kinetics, polymer properties, and o…
Six permutations of 4-fold donor and/or acceptor substitution of paracyclophane at the 4, 7, 12, and 15 positions were synthesized to probe the phenomenon of three-dimensional delocalization on the nonlinear optical properties of organic materials. The interplay between through-bond intramolecular charge transfer (ICT…