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。
The transition between four- and six-coordinate structures in CdSe nanocrystals displays simple transition kinetics as compared with the extended solid, and we determined activation volumes from the pressure dependence of the relaxation times. Our measurements indicate that the transformation takes place by a nucleati…
We propose a heuristic explanation for the numerous non-close-packed crystal structures observed in various colloidal systems. By developing an analogy between soap froths and the soft coronas of fuzzy colloids, we provide a geometrical interpretation of the free energy of soft spheres. Within this picture, we show th…
The synthetic routes and materials properties of polypropylene/montmorillonite nanocomposites are reviewed. The nanocomposite formation is achieved in two ways: either by using functionalized polypropylenes and common organo-montmorillonites, or by using neat/unmodified polypropylene and a semi-fluorinated organic mod…
The influence of modifications at the benzylidene protection group on the gelation ability of 1-O-methyl-4,6-O-benzylidene-monosaccharides was investigated. For α-D-glucose and α-D-mannose the ability for self-aggregation was found to be significantly extended by the introduction of a p-nitro-substituent. As a result,…
Equilibrium solubility, the profile and the rate of ibuprofen dissolution in solutions of sodium dodecyl sulfate, Tween 60 and Brij 35 were studied. It was found that the solubility of ibuprofen was enhanced by the formed micellar system. The size and shape of formed micelles depended on the used particular surfactant…
Infrared reflection-absorption spectra of ${\mathrm{TiO}}_{2}$ thin films deposited by plasma-enhanced chemical vapor deposition onto aluminum and by a sol-gel process onto platinum were obtained using s- and p-polarized light and oblique incidence angles. Prominent bands with variable reflection minima position and l…
Surface Brillouin scattering technique has been used to study the elastic properties of superhard amorphous carbon, synthesized from ${\mathrm{C}}_{60}$ under high pressure (13--13.5 GPa) and temperature $(900\ifmmode\pm\else\textpm\fi{}100\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}).$ This is the first reliable det…
“Aerosol catalysis” is shown to be a powerful tool for investigating the catalytic properties of freshly formed nanoparticles in situ and without substrate interference. The method is first outlined conceptually, followed by an illustrative application to the catalytic formation of methane on a nickel nanoaerosol. Rea…
Polarized absorption and emission spectra of trigonal single crystals of an Er(III) complex coordinated to a heptadentate tripodal ligand are reported at temperatures between 8 and 298 K. The assigned energy levels below the onset of ligand absorption (< 25 000 cm(-1)) are fitted to a parametrized electronic Hamiltoni…
Multicomponent arrays based on a central iridium(III) bis-terpyridine complex (Ir) used as assembling metal and free-base, zinc(II) or gold(III) tetraaryl-porphyrins (PH(2), PZn, PAu) have been designed to generate intramolecular photoinduced charge separation. The rigid dyads PH(2)-Ir, PZn-Ir, PAu-Ir, and the rigid a…
Fluorescence “blinking” kinetics of isolated colloidal InP quantum dots (QDs) are investigated via confocal single molecule microscopy. Analysis of fluorescence trajectories reveals inverse power law behavior (∝ 1/τ m ) in on/off time probability densities with m on ≈ 2.0(2) and m off ≈ 1.5(1). Such an inverse power l…
Valence-band dispersions in ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Mn}}_{x}\mathrm{As}$ along the $\ensuremath{\Gamma}\ensuremath{-}\ensuremath{\Delta}\ensuremath{-}X$ line $(k\ensuremath{\Vert}[001])$ are obtained by angle-resolved photoemission spectroscopy. Compared with the spectra of GaAs, a small energy shift…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSol−Gel Derived Nitric-Oxide Releasing Materials that Reduce Bacterial AdhesionBrian J. Nablo, Ta-Yung Chen, and Mark H. SchoenfischView Author Information Department of Chemistry University of North Carolina Chapel Hill, North Carolina 27599-3290 Cite this: J. Am. Che…
A phenomenological coupled exciton model is proposed in order to characterize optical excitations in extended dendrimers. An onsite exciton state is assigned at each phenyl rings and a nearest neighbor hopping integral which obeys the Gaussian distribution is considered between the exciton states. The decreasing optic…
Antiferromagnetism in stacked nanographite is investigated with using the Hubbard-type model. The A-B stacking is favorable for the hexagonal nanographite with zigzag edges, in order that magnetism appears. Next, we find that the open shell electronic structures can be origins of the decreasing magnetic moment with th…
The paper presents discussion on up to date results on MgB2 conductors from the point of view of their future dc and ac applications. Basic physical parameters of MgB2 compound relevant to conductors are introduced. Different conductor preparation methods and conductor architectures are presented and attainable critic…
We report on a numerical study of quantum diffusion over $\ensuremath{\mu}\mathrm{m}$ lengths in defect-free multiwalled nanotubes. The intershell coupling allows the wave packet spreading over several shells, and when their periodicities along the nanotube axis are incommensurate, electronic propagation is shown to f…
We examine and identify magnetoresistance mechanisms in 2D system containing a sizable concentration of magnetic ions. We argue that some of these mechanisms can serve as a tool to measure spin polarization. Lack of spin degeneracy and enhanced localization make it possible to detect an additional QHE plateau associat…
Abstract The synthesis of boron‐modified polysilazanesof general type {B[C 2 H 4 Si(R)NR′] 3 } n [R = CH 3 , (NR′) 0.5 ; R′ = H, CH 3 ] by dehydrogenative coupling of tris(hydridosilylethyl)boranes B[C 2 H 4 Si(CH 3 ) n H 3− n ] 3 (C 2 H 4 = CHCH 3 , CH 2 CH 2 ; n = 0, 1) and ammonia or methylamine is reported. Deta…
Abstract The dynamic mechanical properties of hybrids of chlorinated polyethylene (CPE) and 3,9‐bis[1,1‐dimethyl‐2{β‐(3‐ tert ‐butyl‐4‐hydroxy‐5‐methylphenyl)propionyloxy}ethyl]‐2,4,8,10‐tetraoxaspiro[5,5]‐undecane (AO‐80) were investigated. The CPE/AO‐80 hybrids showed a novel relaxation in addition to the glass tran…