Materials Literature
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Using a first-principles method, we study field emission properties of double-wall carbon nanotubes with various end geometries and combinations of inner and outer walls. The open double-wall nanotubes exhibit substantial contribution to the emission current from the extended π states. These states are insensitive to…
In this work we investigate the variation of the local structure around ${\mathrm{Cu}}^{2+}$ as well as the crystal structure in ${\mathrm{Rb}}_{2}{\mathrm{CuCl}}_{4}{({\mathrm{H}}_{2}\mathrm{O})}_{2}$ through x-ray absorption spectroscopy (XAS) and x-ray diffraction (XRD) as a function of pressure. We show that the a…
We have investigated the structure and morphology of the tenfold surface of decagonal ${\mathrm{Al}}_{71.8}{\mathrm{Ni}}_{14.8}{\mathrm{Co}}_{13.4}$ by highly surface sensitive He atom scattering (HAS), high resolution low energy electron diffraction(SPA-LEED), and low temperature scanning tunneling microscopy (STM).…
The chemical preparation of structurally well-defined biodegradable amphiphilic block copolymers is now of great interest for biomedical applications and the fundamental mimetic study of biomacromolecule self-assembly. For this purpose, in this study, (R,R)-N,N'-bis(3-tert-butylsalicylidene)-1,2-cyclohexanediamine 2 a…
Abstract Random and block copolymerizations of L ‐ or D ‐lactide with ε‐caprolactone (CL) were performed with a novel anionic initiator, (C 5 Me 5 ) 2 SmMe(THF), and they resulted in partial epimerization, generating D , L ‐ or meso ‐lactide polymers with enhanced biodegradability. A blend of PLLA‐ r ‐PCL [82/18; PLLA…
We report a metastable bcc phase that intervenes between a disordered micellar suspension and an fcc crystal in a block copolymer solution. Upon heating, the metastable bcc phase nucleates first, and then transforms over the course of hours to the stable fcc phase. At still higher temperatures, the fcc phase transform…
Polyaniline (PANI) composite microwires containing CdS nanoparticles were synthesized guided by poly(acrylic acid) (PAA). It was found that the morphology of the composite microwires was affected by the concentration of PAA. When the concentration of PAA was lower than 0.1 mg ml −1 , the PANI/CdS composite was wires.…
Abstract Monosubstituted and disubstituted 3,4‐propylenedioxythiophenes were synthesized and polymerized by both chemical and electrochemical methods. All the monomers were characterized for their molecular structures, and the polymers were characterized for their electrochemical properties. The disubstituted derivati…
Abstract Summary: Polycarbonate (PC)/high density polyethylene (HDPE) in situ microfibrillar blends were fabricated by a slit die extrusion, hot stretching, and quenching process. Despite PC and HDPE having a high viscosity ratio, which is usually disadvantageous to fibrillation, the morphological observation indicate…
Transparent polycrystalline ZnS nanobelts have been grown by chemical bath deposition within the pores of polyvinyl alcohol on glass and Si substrates. Zinc acetate and sodium sulphide, dissolved in an alkaline medium, were taken as the source of zinc and sulfur respectively. X-ray diffraction and transmission electro…
To improve the performance of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx), gelatin was blended with PHBHHx at different ratios. With increasing gelatin content, the weight loss of gelatin/PHBHHx blend in simulated body fluid at 37 degrees C was accelerated. After 2 months, there was about 15% weight loss in…
Abstract Summary: Inclusion complexes (ICs) between α ‐cyclodextrin ( α ‐CD) and three kinds of biodegradable aliphatic polyesters with different sequence lengths of the monomeric repeating units poly(3‐hydroxypropionate) [P(3HP)], poly(4‐hydroxybutyrate) [P(4HB)] and poly( ε ‐caprolactone)(PCL) were prepared by mixin…
Ultra-thin alumina films with self-ordered cylindrical vertical pores were fabricated on a p-type silicon substrate by anodization of Al films with thickness in the range of 30–500 nm in sulfuric or oxalic acid aqueous solutions. In both cases the pores were arranged in hexagonal cells in a close-packed structure and…
Catalysts of Ni/SiO 2 and Ni−La/SiO 2 were prepared using the incipient-wetness impregnation method. The prepared catalysts were used to produce syngas from a combined reaction of CO 2 reforming and partial oxidation of methane in a fluidized-bed reactor. Ni/SiO 2 exhibited excellent resistance to carbon deposition an…
The ellipsometry measurements (in the energy range $E=0.5--5.0\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$) on cleavage surfaces of single crystals, the measurements of the absorption and reflectance spectra $(E=0.04--0.8\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$, electrical resistivity, and magnetic susceptibility were carr…
We consider a model of self-avoiding walk on a lattice with on-site repulsion and an attraction for every vertex of the walk visited on the surface to study force-induced desorption of a linear polymer chain adsorbed on an attractive surface and use the exact enumeration technique for analyzing how the critical force…
Abstract Summary: We have prepared waterborne polyurethane (WBPU) thin films containing gold nanoparticles by casting WBPU/Au solutions. The effect of the Au nanoparticle contents on the microstructure and properties of the composite films was investigated by thermogravimetric analysis (TGA), differential scanning cal…
An explanation of the glasslike anomaly observed in the low-temperature specific heat of incommensurate phases is proposed. The key point of this explanation is to properly account for the phason damping when computing the thermodynamic magnitudes. The low-temperature specific heat of the incommensurate phases is disc…
Antimony glasses based on the composition Sb2O3–SbPO4 were prepared and characterized. The samples present high refractive index, good transmission from 380to2000nm, and high thermal stability. The nonlinear refractive index, n2, of the samples was studied using the optical Kerr shutter technique at 800nm. The third-o…
Abstract Summary: A series of regioselectively dendronized cellulose derivatives has been prepared by the treatment of cellulose in a N , N ‐dimethylacetamide/LiCl solvent system with dendrons possessing isocyanate focal substituents. These new materials were characterized using FT‐IR and 13 C NMR spectroscopies, and…