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 quantum Hall (QH) effect in two-dimensional electrons and holes in high quality graphene samples is studied in strong magnetic fields up to 45 T. QH plateaus at filling factors $\ensuremath{\nu}=0,\ifmmode\pm\else\textpm\fi{}1,\ifmmode\pm\else\textpm\fi{}4$ are discovered at magnetic fields $B>20\text{ }\text{…
Modification of the surface chemistry of nanocrystalline VN yields a new class of supercapacitors that deliver an impressive specific capacitance. The creation of surface nanolayers of VOx (poor electronic conductivity) on the electronically conductive nanocrystalline VN shown in the figure and on the cover gives rise…
We use self-consistent mean-field theory to investigate a system of A homopolymer, AB copolymer, and C homopolymer, where there are attractive interactions between the B and C components. We calculate volume fraction profiles and chemical potentials of formation for unswollen micelles, swollen micelles, and flat inter…
Abstract Modification of chitosan (CTN), a natural biomaterial, leading to improved physical and chemical properties makes the polymer overcome the limitations on its application in biomedical fields. We have modified CTN using polyvinylpyrrolidone (PVP) in three ways, i.e., by blending (CTN : PVP), by graft copolymer…
The onset of softening in the glass transition dispersion of the gelatin/cosolute system at 78% solids was examined using the stress relaxation modulus and dynamic oscillatory data on shear. Measurements were made between 5 and -70 degrees C, and isothermal runs were reduced to a master curve covering 21 orders of mag…
Few examples of magnetic systems displaying a transition to pure dipolar magnetic order are known to date. As was recently shown, within the newly discovered class of single-molecule magnets, quite attractive examples of dipolar magnetism may be found. The molecular cluster spins and thus their dipolar interaction ene…
OBJECTIVE: Neointimal and medial thickening play a critical role in late vein graft failure following CABG. Previous ex vivo experiment suggested that perivenous application of fibrin glue may reduce the damage in the circular smooth muscle cell layer of the media of the vein graft shortly after exposing to arterial p…
Abstract The polymerization of 1,3‐dioxolane catalyzed by Maghnite‐H +; (Mag‐H + ), a montmorillonite sheet silicate clay exchanged with protons, was investigated. The cationic ring‐opening polymerization of 1,3‐dioxolane was initiated by Mag‐H + at different temperatures (20, 30, 50, and 70°C) in bulk and in a solven…
Abstract Thin films of various half‐metallic ferromagnets, such as chromium dioxide (CrO 2 ) and Heusler alloys (Co 2 Cr 0.6 Fe 0.4 Al, Co 2 MnSi) have been investigated by ferromagnetic resonance (FMR) technique. It is demonstrated that FMR is a very efficient method to study the nanoscale magnetic properties, in par…
Confocal scanning laser microscopy has been used to quantitatively analyze the structure and dynamics of concentrated suspensions of spherical colloids in which the magnitude of the short-range attractive potential is increased by adding nonadsorbing polymers. These systems undergo a reentrant glass transition upon in…
Abstract Summary: Aliphatic dithiol‐diacid type polythioesters were first enzymatically prepared by the direct polycondensation of hexane‐1,6‐dithiol and diacid diesters using the immobilized lipase from Candida antarctica (lipase CA). As a typical example, diethyl sebacate and hexane‐1,6‐dithiol were polymerized usin…
We use conductive-probe atomic force microscopy (CP-AFM) to characterize and image hybrid electrode structures comprising mesoporous manganese oxide (MnO2) ambigel nanoarchitectures coated with an ultrathin (<10 nm) electrodeposited layer of poly(o-phenylenediamine), PPD. Native MnO2 ambigel films, supported on indium…
Abstract New toughened poly(butylene terephthalate) (PBT)/bisphenol A polycarbonate (PC) blends were obtained by melt blending with ethylene–butylacrylate–glycidyl methacrylate copolymer (PTW) and ethylene‐1‐octylene copolymer (POE) in a twin‐screw extruder. The mechanical properties of PBT/PC blends were investigated…
The tensile properties of kraft cooked Norway spruce were studied by tensile testing with in situ X-ray diffraction (XRD). Samples were of earlywood, cooked for varying times. The total lignin content of the samples was between 21.7% and 9.3%. Tensile tests with XRD were performed on wet samples, without XRD on dry sa…
The enzyme phosphomannomutase/phosphoglucomutase (PMM/PGM) from Pseudomonas aeruginosa catalyzes the reversible conversion of 1-phospho to 6-phospho-sugars. The reaction entails two phosphoryl transfers, with an intervening 180 degrees reorientation of the reaction intermediate (e.g. glucose 1,6-bisphosphate) during c…
Regular arrays of rectangular gold nanoparticles on glass substrates are characterized by using linear extinction spectroscopy (in the wavelength range of $450--950\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$) and nonlinear scanning optical microscopy, in which two-photon photoluminescence (TPL) excited with a strongly foc…
Abstract Summary: A new route that combines graft pre‐treatment and drawing techniques with melt mixing to prepare nanoparticle‐filled thermoplastic polymer composites is reported. Nano‐SiO 2 particles are first modified by graft polymerization and then the grafted nanoparticles are melt‐compounded with poly(propylene…
We employ fully atomistic molecular modeling to investigate the concentration dependence of the electro-optic coefficient of two guest-host polymer composites. Using classical molecular dynamics, we record the time-evolution of the guest-host system under the application of an external electric field. Through analysis…
The tuning of the bending stiffness of structural elements is of interest for, among other things, the suppression of vibrations related to resonance phenomena. For a given cross-sectional area and geometry, the variation of the elastic properties of the material composing the structure provides a viable approach to t…
Abstract A new modified electrode having multiwall carbon nanotube (MWNT) grafted with polydiphenylamine (PDPA) as electrocatalytic layer is fabricated. FESEM image of the modified electrode shows a different morphology indicating the grafting of PDPA over MWNT. This morphology is in quite contrast from the convention…