Materials Literature
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Abstract A new synthetic approach to prepare Ag nanoparticles protected side‐chain liquid crystalline (LC) azobenzene polymers was reported. It is based on the reduction of silver ions in presence of a LC polymer polymerized by RAFT. The formation of Ag colloidal nanoparticles was confirmed by TEM and UV analysis. At…
A silicon (Si) nanowire grid ultraviolet (UV) transmission polarizer has been fabricated, and its performance was measured over the visible to deep UV range. A cylinder-forming polystyrene-b-poly(hexylmethacrylate) diblock copolymer was coated onto an amorphous Si layer supported on a fused silica substrate, then shea…
Dense hexagonal TmMnO3 ceramics were synthesized by solid-state reaction technique combined with high-pressure treatment which significantly increased the density of ceramic samples. The crystal structure of the hexagonal TmMnO3 oxide was refined by using Rietveld analysis based on powder x-ray diffraction experiment.…
The adhesion force between blood-compatible polymer (poly(2-methoxyethyl acrylate: PMEA) and proteins (fibrinogen and bovine serum albumin (BSA)) were measured by atomic force microscopy. The PMEA surface showed almost no adhesion to native protein molecules, whereas non-blood-compatible poly(n-butyl acrylate): PBA st…
Abstract This review presents firstly the synthesis of various dendritic hyperbranched polymers with well‐defined structures by generation‐based growth methodologies using living/controlled polymerization. Secondly, the synthesis of dendritic hyperbranched poly(methyl methacrylate)s (PMMAs) and their functionalized bl…
The axial orientation of molecular-beam-epitaxy (MBE)-grown Fe3Si(111)∕Ge(111) hybrid structures was investigated by Rutherford backscattering spectroscopy. We confirmed that during MBE above 300°C, the interdiffusion of Fe and Ge atoms results in a composition change and the epitaxial growth of FeGe in Fe3Si. Low-tem…
We report on the growth and structural properties of Ca3Co2O6 thin films deposited by pulsed laser ablation on SrTiO3 substrates heated at 700°C. In situ reflection high-energy electron diffraction and ex situ atomic force microscopy observations reveal that Ca3Co2O6 grows in a three-dimensional (3D) mode with a surfa…
We have performed a first-principles computational tensile test (FPCTT) on an Na-segregated Al grain boundary (GB) with an Si additive. We show that the Si additive in the GB greatly increases both the tensile strength and the toughness of the Na-segregated Al GB. We demonstrate that the final GB fracture is dominated…
Magneto-transport and magnetic studies carried out on the (1− x )Pr 2/3 Ba 1/3 MnO 3 + x Ag 2 O ( x = 0–30 mol%) composite system are reported here. Two transitions ( T P1 and T P2 ) are observed in the electrical resistivity of the pristine Pr 2/3 Ba 1/3 MnO 3 (PBMO) system. With addition of Ag 2 O electrical resisti…
We demonstrate that shadowing instabilities can dramatically alter the very early stages of growth of amorphous thin films on nominally smooth surfaces. These observations are made by comparing the porosity and morphological evolutions of thin films grown under conditions of normal and glancing incidences of the vapor…
Seamless, non-woven, bioresorbable vascular prosthetics composed of sub-micron fibers have been successfully created through electrospinning. These prosthetics have proven to be both bioactive and mechanically viable during in vitro testing, and hold great potential to be conducive to in situ tissue engineering/regene…
Summary Poly(lactide‐ co ‐glycolide) (PLGA) (50:50) films loaded with antioxidants, such as 2% α ‐tocopherol, or a combination of 1% butylated hydroxytoluene (BHT) and 1% butylated hydroxyanisole (BHA), were used in an antioxidant release study in water and oil at 4 and 25 °C, and to evaluate the stability of dry whol…
Orientation dependent electron phonon (EP) coupling on single wurtzite CdS nanowires with average diameter of 60nm has been studied using polarized Raman spectroscopy. The Raman spectra of nanowires are compared with those of bulk ribbon. Different from the bulk sample, the EP coupling of the nanowires is polarized al…
Oriented barium ferrite (BaM) and polycrystalline ferroelectric barium strontium titanate (BSTO) layered structures have been fabricated by pulsed laser deposition. The 0.5μm thick BaM layer has a saturation induction of 4kG, a uniaxial effective anisotropy field of 16kOe, and a relatively low ferromagnetic resonance…
Abstract In this study, we exclusively found that the exfoliated poly(vinyl acetate)‐montmorillonite (PVAc‐MMT) nanocomposite latices could be straightforwardly fabricated by soap‐free emulsion polymerization and cast into a film. The as‐fabricated films were transparent with the exfoliated MMT nanoplatelets in flat f…
Carbon nanotubes have very high potential for applications in nano-electromechanical devices, nano-optomechanical systems and nano-composites. However, their full exploitation depends upon knowledge of their mechanical, electrical and thermal properties. Several analytical, experimental, molecular mechanics (MM) and m…
Abstract This contribution reports on the synthesis of hyperbranched polylysines via thermal polymerization of L ‐lysine hydrochloride. Polymerization of L ‐lysine hydrochloride in the presence of one equivalent KOH at 150 °C resulted in polymers with a number‐average molecular weight of 4600 g/mol and a polydispersit…
The ultrafast photoluminescence dynamics of nitride-passivated silicon nanocrystals is investigated using the variable stripe length geometry with 200 femtosecond pump pulses. We find that the luminescence lifetimes are in the nanosecond range throughout the entire spectral range. However, no evidence for optical gain…
Abstract A novel in‐site H 2 O 2 strategy is proposed for the liquid‐phase epoxidation of propene catalyzed by titanium silicalite (TS‐1). Said in‐site H 2 O 2 strategy is based on the direct synthesis of H 2 O 2 from H 2 and O 2 under atmospheric pressure via nonequilibrium plasma reactions. Methanol is used to absor…
Abstract The thermal behavior and spherulitic morphologies of poly( L ‐lactic acid) (PLLA)/poly( D ‐lactic acid) (PDLA) 1/1 blend with weight‐molecular‐weight of 10 5 order, together with those of pure PLLA and PDLA, were investigated using differential scanning calorimetry and polarized optical microscopy. It was fou…