Materials Literature
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First-principles calculations are performed to study the adsorption and dehydrogenation of ethylene on PdAu(001) bimetallic surfaces. The activation energies for C-H bond breaking of ethylene strongly depend on the ensemble effect. Particularly, ethylene is unlikely to decompose on the most popular ensembles of PdAu(0…
We demonstrate that quantum dots injected into two model tumors rapidly migrate to sentinel lymph nodes. PEG-coated quantum dots having terminal carboxyl, amino, or methoxyl groups all migrated from the tumor to surrounding lymph nodes similarly. Passage from the tumor through lymphatics to adjacent nodes could be vis…
We report our discovery of ferroelectricity in the spiral-magnetic state in the quantum quasi-one-dimensional (1D) S=1/2 magnet of LiCu2O2. Electric polarization (P) emerges along the c direction below the spiral-magnetic order temperature, but changes from the c to a axis when magnetic fields (H) are applied along th…
Nanocrystals of metal phosphides, which can have useful catalytic, electronic, and magnetic properties, are known to be accessible by using trioctylphosphine (TOP) as a highly reactive phosphorus source. Here we report a general strategy for synthesizing transition metal phosphides, including those with 4d and 5d tran…
This paper is concerned with the free vibration problem for micro/nanobeams modelled after Eringen's nonlocal elasticity theory and Timoshenko beam theory. The small scale effect is taken into consideration in the former theory while the effects of transverse shear deformation and rotary inertia are accounted for in t…
We present a detailed study of the vibrational properties of single wall carbon nanotubes (SWNTs). The phonon dispersions of SWNTs are strongly shaped by the effects of electron-phonon coupling. We analyze the separate contributions of curvature and confinement. Confinement plays a major role in modifying SWNT phonons…
Preface / Crystallography / Crystal Bonding / Crystal Imperfections / Lattice Vibrations / Free Electrons of Metals / Band Theory, Semiconductors and Devices / Dielectric Properties / Magnetic Properties of Materials / Superconductivity / Table of Physical Constants / References / Subject Index.
We study the dynamics of shock-tracking probe particles in driven diffusive systems and also in equilibrium systems. In a driven system, they induce a diverging timescale that marks the crossover between a passive scalar regime at early times and a diffusive regime at late times; a scaling form characterizes this cros…
The hydroisomerization of n -octane over Ni−WO x /silica−alumina based catalysts has been investigated in a down flow fixed-bed quartz reactor by changing operating conditions such as time on stream, reaction temperature, SiO 2 /Al 2 O 3 and H 2 / n -octane ratio, andspace velocity. This study aims to understand the a…
Acid-catalyzed silica polymerization was carried out under gravity conditions varied from 0.01 g aboard a reduced gravity aircraft to 70 g in a centrifuge. The silicate connectivity of the final xerogels was analyzed using solid state 29 Si NMR and the porosity using nitrogen adsorption. Gravity was found to have an i…
Abstract Several novel kinds of bis‐quaternary ammonium peroxotungstates and peroxomolybdates, such as PhCH 2 N(CH 2 CH 2 ) 3 NCH 2 Ph[W 2 O 3 (O 2 ) 4 ], PhCH 2 N(CH 2 CH 2 ) 3 NCH 2 Ph [Mo 2 O 3 (O 2 ) 4 ], [PhCH 2 (CH 3 ) 2 NCH 2 ] 2 [W 2 O 3 (O 2 ) 4 ] and [PhCH 2 (CH 3 ) 2 NCH 2 ] 2 [Mo 2 O 3 (O 2 ) 4 ], have bee…
The present work reports a direct glycoprotein immobilization protocol where the protein is chemically modified with disulfide groups which act as anchor molecules able to chemisorb spontaneously onto clean gold surfaces. The specificity of the chemical reaction, for disulfide introduction, toward carbohydrate moietie…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Abstract Bicyclo[2.2.2]oct‐7‐ene‐2,3,5,6‐tetracarboxylic dianhydride (BCDA)‐based polyimide–clay nanocomposites were prepared from their precursor, namely polyamic acid, by a solution‐casting method. The organoclay was prepared by treating sodium montmorillonite (Kunipia F) clay with dodecyltrimethylammonium bromide a…
The electronic properties of isolated single-walled carbon nanotubes (SWNTs) adsorbed onto n- and p-doped hydrogen-passivated Si(100) surfaces are studied by ultrahigh vacuum scanning tunnelling spectroscopy and ab initio density-functional methods. SWNTs identified as semiconductors (s-SWNTs) have well-defined conduc…
Abstract Enzymatic grafting of caprolactone was carried out from poly[styrene‐ co ‐(4‐vinylbenzyl alcohol)] containing 10% hydroxyl functional monomer and compared with the grafting of vinyl acetate. A molecular weight increase due to the grafting of polycaprolactone was observed by size exclusion chromatography. Clos…
Free-standing porous objects were made by the electrophoretic deposition and slip casting of Pickering emulsions stabilized with alumina and titanium powder. By controlling the emulsion parameters, the pore size can be controlled from a few micrometers to a few millimeters. Both open and closed porosity were obtained…
Abstract Magnetic nanoadsorbents using Fe 3 O 4 nanoparticles as cores and poly(methyl acrylic acid) (PMAA) as ionic exchange groups were prepared through our novel approach. Two steps were involved in this approach: the first was to functionalize the magnetic nanoparticles (MNPs) with methacrylate double bonds via th…
Multilayer thin film coatings were prepared on silicon substrates. Poly(vinyl alcohol) was adsorbed from aqueous solution to propyldimethylsilyl-modified silicon wafers. This thin semicrystalline coating was chemically modified using acid chlorides to form thicker, hydrophobic coatings. The products of the modificatio…
A radar window for a re-entry vehicle should process critical mechanical properties. Fused silica, BN and Si3N4 ceramics are the three popular materials for such applications, but are limited in some fields for their intrinsic disadvantages. In the present study, 2.5 dimensional silica fiber reinforced Si3N4-BN matrix…