Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
As a hybrid of two aryl motifs, that is p-anisyl and mesityl, the 4-methoxy-2,6-dimethylphenyl or “manisyl” substituent offers possibilities for both further structural elaboration as well as enhancing the solubility of the heterocyclic ligands mentioned in the title. A highlight of this work lies in the ability of th…
Highly branched poly(methyl methacrylate) with an estimated degree of branching = 0.074 (i.e., 3.7 branchpoints per 100 monomer units) was prepared using self-condensing group transfer copolymerization (SCVCP) of methyl methacrylate (MMA) and 2-(2-methyl-1-triethylsiloxy-1-propenyloxy)ethyl methacrylate (MTSHEMA) and…
A quantitative analysis of Si29 nuclear magnetic resonance spectra of radiation damaged, natural zircons showed that the local structure in crystalline and amorphous regions depend explicitly on radiation dose. Nonpercolating amorphous islands of high density “glass” within the crystalline matrix show a low interconne…
Short block copolymers in a selective solvent (bad for A-block, good for B-block) are modeled by flexible bead−spring chains, where beads interact with short-range Morse potentials of variable strength. In particular, treating the strength E AA of attraction between monomers of the A-block as a variable, we study the…
The polarization reversal process of tetragonal Pb(Zr,Ti)O3 thin films has been intensively studied using conventional hysteresis and rectangle pulse measurements. Decreasing the voltage level of the pulses significantly slows down the polarization switching to the range of milliseconds. The switching current response…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLanthanide Tags for Time-Resolved Luminescence Microscopy Displaying Improved Stability and Optical PropertiesLoïc Charbonnière, Raymond Ziessel, Massimo Guardigli, Aldo Roda, Nanda Sabbatini, and Michèle CesarioView Author Information Laboratoire de Chimie d'Electroni…
Given the intrinsic relation between phase behavior and performance in applications involving polymer mixtures, the thermodynamics of these systems has been the common focus of a wide body of experimental and theoretical studies. An elusive goal in this research field has been the ability to predict or simulate the de…
For a general spin dimer that has different numbers of unpaired electrons at the two spin sites, we examined the relationship between the spin exchange parameter J and the energy difference between the broken-symmetry and highest-spin states of the spin dimer on the basis of the spin-Hamiltonian Ĥ=−JŜ1⋅Ŝ2. The resulti…
A molecular-dynamics thermal annealing model is proposed to investigate the mechanisms involved in picosecond pulsed laser ablation of crystalline silicon. In accordance with the thermal annealing model, a detailed description of the microscopic processes which result from the interaction of a 308 nm, 10 ps, Gaussian…
The dispersion relations of the surface polaritons of a slab made of a material which has dispersive permittivity and permeability, and is left-handed over a frequency band in the microwave range of several GHz, are investigated. Four branches of p polarized surface polaritons and two branches of s polarized ones are…
NiO in association with aluminum oxide has been identified by temperature-programmed reduction as the active species in the Ni–Al hydrotalcite catalyst that oxidizes α-ketols as well as benzylic and allylic alcohols to their corresponding carbonyl compounds in oxygen in quantitative yields under mild reaction conditio…
To the Editor: Various vascular grafts are commonly used in the reconstruction of cardiovascular tissues. However, prosthetic or bioprosthetic materials lack growth potential and therefore in child...
The Gilroy-Phillips model of relaxational jumps in asymmetric double-well potentials, developed for the Arrhenius-type secondary relaxations of the glass phase, is extended to a formal description of the breakdown of the shear modulus at the glass transition, the $\ensuremath{\alpha}$ process. The extension requires t…
Experimental and modeling studies are presented on the synthesis of bisphenol A polycarbonate at ambient pressure by a novel forced gas sweeping process. Unlike in the conventional high-vacuum melt transesterification process, the condensation byproduct (phenol) is removed from a highly viscous polymer melt in the for…
Chicken egg-white lysozyme (CEWL) crystals were grown in microgravity and on the ground in the presence of various amounts of a naturally occurring lysozyme dimer impurity. No significant favorable differences in impurity incorporation between microgravity and ground crystal samples were observed. At low impurity conc…
The isomorphous compounds $({\mathrm{CH}}_{3}{)}_{2}{\mathrm{CHNH}}_{3}{\mathrm{CuCl}}_{3}$ and $({\mathrm{CH}}_{3}{)}_{2}{\mathrm{CHNH}}_{3}{\mathrm{CuBr}}_{3}$ consist of ferromagnetic-antiferromagnetic and antiferromagnetic-antiferromagnetic alternating Heisenberg chains with $S=1/2,$ respectively. The ground state…
The interplay of photochromism and fluorescence was studied by attaching anthracene as chromophore to dithienylperfluorocyclopentene (1,2-bis[5-anthryl-2-methylthien-3-yl]perfluorocyclopentene, Ac-BMTFP). The blue fluorescence of the open isomer of Ac-BMTFP is suppressed by the ring-closure reaction. The spectroscopic…
Synthesis, structure determination by single-crystal X-ray diffraction, and physical properties are reported and compared for superconducting and semiconducting molecular charge-transfer salts with stoichiometry (BEDT-TTF)(4)[A(I)M(III)(C(2)O(4))(3)].PhCN, where A(I) = H(3)O, NH(4), K; M(III) = Cr, Fe, Co, Al; BEDT-TT…
Potassium manganese oxide materials having the synthetic birnessite structure K-OL-1 were synthesized by reduction methods. K-OL-1 has been ion-exchanged with H + to produce H-OL-1, which was utilized in further intercalating reactions. The tetraalkylammonium hydroxides including tetramethylammonium hydroxide, tetraet…
The dehydrogenation of IrH 2 {C 6 H 3 -2,6-(CH 2 PBu t 2 ) 2 } ( 1 ) by tert -butylethylene followed by reaction with an excess of water leads to the isolation of IrH(OH){C 6 H 3 -2,6-(CH 2 PBu t 2 ) 2 } ( 2 ) in nearly quantitative yield. The hydrido hydroxo complex has been characterized by multinuclear NMR spectros…