Materials Literature
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First-principles plane-wave pseudopotential calculations were performed to study electronic structures, structural relaxation, and energetics of intrinsic vacancies and interstitials in ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}.$ In the presence of the intrinsic point defects, extra levels appeared in the band gap. Consideri…
The X-ray structures of [Os(bpy) 2 (CO)(Cl)][(PF 6 )] ( 1 ) and [Os(bpy) 2 (CO)(H)][(PF 6 )] ( 2 ) (where bpy = 2,2‘-bipyridine) have been solved. In complex 1, belonging to the C 2/ c space group, the Cl - and CO ligands are statically disordered along two almost orthogonal directions, and this disorder may be explai…
A general procedure, solvent-induced homogeneous dispersion, SIHD, is presented to incorporate and align conjugated polymers into a nematic liquid-crystal host. We report the investigation of the dye, N‘,N‘-bis(2,6 dimethylphenyl)-3,4,9,10, perylenetetracarboxylic dimide (PERY), and a conjugated polymer, poly[2-(2‘eth…
Thermal deformation behavior of Triaxial Woven Fabric (TWF) composites is modeled herein using Super-Finite-Elements proposed previously. Thermal deformation behavior and Thermal Expansion Coefficients (TECs) of the TWF composites are evaluated. Effects of the aspect ratios and size of the panels on the TECs are studi…
By using the time-resolved small angle light scattering (TRSALS) technique, we present the first real-time measurement of the physical gelation process for a crystalline polymer. The finding is that the light scattering patterns show a unique feature in the H v and the V v scattering for PVDF gel electrolytes. More si…
The effects of hydrodynamically induced textile deformation during resin injection in Liquid Composites Molding processes have been experimentally investigated for various fiber volume fractions in a rectangular flow channel with linear injection gate. For layups from bi-directional ±45° engineered glass fiber fabric,…
In this work, a new procedure for the synthesis of the selectively deuterium-labeled chiral liquid crystal (+)-( S )-4-[4‘-(1-methylheptyloxy)] biphenyl 4-(10-undecenyloxy)benzoate (11EB1M7) has been developed, aimed to the study of its structure, orientational ordering, and dynamic behavior by means of 2 H NMR. 11EB1…
The platelike crystals of a series of novel molecular conductors, which are based on the pi-donor molecules BDT-TTP (2,5-bis(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene) with a tetrathiapentalene skeleton and lanthanide nitrate complex anions [Ln(NO3)x](3-x)(Ln = La, Ce, (Pr), Tb, Dy, Ho, Er, Tm, Yb, Lu) with lo…
A surface modification strategy has been employed for the patterned assembly of single-walled carbon nanomaterials onto oxide surfaces. The method relies on distinct molecular recognition properties of different functional groups toward the carbon graphitic structure. The surface modification starts with reactions bet…
Physical properties of chiral poly(thioesters), PTEs, prepared by engineered Escherichia coli, were examined by GPC, 13C CP/MAS solid-state NMR, X-ray diffraction, and thermal analysis. Microbial homopolymers of PTEs, poly(3-mercaptopropionate), PMP, and poly(3-mercaptovalerate), PMV, showed different solubility chara…
A new route to periodic mesoporous aminosilicas (PMAs) that contain amine functional groups in the framework of a mesoporous network is reported. The materials are prepared via thermal ammonolysis of periodic mesoporous organosilicas (PMOs) under a flow of ammonia gas. PMOs integrate similar or even higher quantities…
A series of CoSb 3 samples was synthesized at low temperature (∼150 °C) using modulated elemental reactants, with composition varying between Co-rich and Sb-rich, resulting in lattice parameters ranging from 9.023 to 9.090 Å. The samples were annealed in 100 °C increments from 200 to 600 °C, with lattice parameter, el…
We have exploited potential utility of 4,4,5,5-tetramethylimidazolin-1-oxyl (hin) and 4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide (hnn) as mu-1,4 and mu-1,5 bridging ligands, respectively, carrying an unpaired electron in development of metal-radical hybrid magnets. X-ray diffraction measurements of [Cu(hfac)(2)hin]…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTThe First Optically Active PolycarbazolesZhong-Biao Zhang, Masao Motonaga, Michiya Fujiki, and Charles E. McKennaView Author Information Department of Chemistry, University of Southern California, Los Angeles, California 90089-0744;…
Tyrosine-functionalized polyphosphazenes were synthesized, and their hydrolytic stability, pH-sensitive behavior, and hydrogel-forming capabilities were investigated. The physical and chemical properties of the polymers varied with the type of linkage between the tyrosine unit and phosphazene backbone. Poly[(ethyl gly…
Theoretically predicted and experimentally confirmed occurrence of infrared-induced second harmonic generation for glasses in the middle infrared spectral region is described by fifth-order nonlinear optical susceptibility. This effect is observed in the middle-IR region when the value of the electronic energy gap is…
Silver sulfide nanocrystals have been formed by the conversion of silver thiolate polymers with sodium sulfide in a dual-phase solution preparation. From transmission electron microscopy and laser desorption ionization mass spectrometry, the mean nanocrystalline diameter is estimated to be 5.4 nm. Large-angle X-ray di…
Two new one-dimensional (1-D) 3d-5d cyano-bridged bimetallic assemblies, ([Co(3)(II)(DMF)(12)][W(V)(CN)(8)](2)])(infinity) (1) and ([Mn(3)(II)(bipy)(2)(DMF)(8)][W(V)(CN)(8)](2))(infinity) (2), have been synthesized and characterized, where bipy stands for 2,2'-bipyridine and DMF represents N,N-dimethylformamide. The X…
We report on the synthesis of bimodal, structured silicas by a fully chemical, templating−scaffolding route that enables independent control over small and large mesopore sizes. Mesoporous MCM-41 nanoparticles, synthesized in a first step, are cross-linked in a second step, leading to a bimodal porous material. Triblo…
A nanowire−nanocable−nanotube scheme was designed for fabricating tubular ZnO in a microwave plasma system. Depending on optimal reaction conditions, diameters (from submicrometer to nanometer) and wall thicknesses of the tubular ZnOs can be controlled in the process. Data from morphology analyses, X-ray diffraction,…