Materials Literature
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Abstract This research is devoted to the development of theoretical foundations for identification of an essentially inhomogeneous prestressed state by analyzing the gain‐frequency characteristic of boundary points of the body. The proposed scheme to the reconstruction of inhomogeneous prestresses is constructed on th…
The fabrication and use of metal nanoparticles to influence electronic transitions in a given molecule is of growing interest; there is much to be gained by developing and exploiting methods to enhance weak optical signals. Singlet molecular oxygen, O 2 (a 1 ∆ g ), which is an important intermediate in many oxidation…
Until now, gels have been formed of multicomponent soft matter systems, consisting of a solvent and one or more macromolecular or colloidal species. Here we show that, for sufficient quench rates, the Girifalco model of C(60) can form gels which we identify by their slow dynamics and long-lived network structure. Thes…
Ethylene—acrylic ester—maleic anhydride (EAEM), as a compatibilizer, has been used to modify a new halogen-free flame retardant linear low-density polyethylene (LLDPE) in this article. Intumescent flame retardants (IFRs) consist of a charring—foaming agent (CFA), ammonium polyphosphate (APP), organic montmorillonite (…
Abstract The feasibility of using the conventional two‐step procedure involving the thermal imidization of a high‐molecular‐weight poly(amic acid) (PAA) for the preparation of self‐supporting polyimide (PI) films was studied. Synthesized PAA and PI were analyzed with respect to their molecular weights, chemical struct…
Abstract We report on the infrared (IR) and Raman studies of the three isostructural quasi‐one‐dimensional cation radical salts of 3,4‐dimethyl‐tetrathiafulvalene ( o ‐DMTTF) 2 X (X = Cl, Br, and I), which all exhibit metallic properties at room temperature and undergo transitions to a semiconducting state in two step…
We have prepared single-crystal, thin GaInN/ZnO solid-solution nanosheets by nitration of a single source Ga−In−Zn−O gel-like homogeneous precursor. The thickness of these nanosheets can be as low as about 2 nm. The In doping ratio typically was 1−2%. It is found that while indium plays an important role in the format…
Abstract Crosslinked polymer beads with tunable pore morphology were prepared by suspension polymerization of styrene (St) and divinylbenzene (DVB) with polypropylene in combination with toluene as co‐porogens. The effect of DVB content on the pore morphology was investigated by changing DVB amount in monomer mixture.…
The cross-linking of polymer brushes is studied using the bond-fluctuation model. By mapping the cross-linking process into a two-dimensional (2D) percolation problem within the lattice of grafting points, we investigate the gelation transition in detail. We show that the particular properties of cross-linked polymer…
High-energy x-ray diffraction data from a series of amorphous ZrW${}_{2}$O${}_{8}$ samples, recovered from a number of different pressures, have been measured and compared with similar data collected from a sample contained within a diamond anvil cell and measured in situ at high pressure. Samples at lower pressures a…
Abstract The spherical silica powders were prepared by using an oxygen–acetylene flame method. After spheroidization, a scanning electron microscope investigation revealed that the spheroidization efficiency of the powder was nearly 100%, XRD patterns indicated that the raw crystal silica became amorphous silica. In t…
A new and simple procedure to enhance the fluorescence of analytes on the surfaces of a solid substrate is demonstrated based on Ag@SiO(2) nanoparticles. Two kinds of silver-silica core-shell nanoparticles with shell thicknesses of around 3 and 15 nm have been prepared and used as enhancing agents, respectively. By si…
Serine dehydrogenase from Escherichia coli is a homotetrameric enzyme belonging to the short-chain dehydrogenase/reductase (SDR) family. This enzyme catalyses the NADP(+)-dependent oxidation of serine to 2-aminomalonate semialdehyde. The enzyme shows a stereospecificity for β-(3S)-hydroxy acid as a substrate; however,…
Abstract Styrene–butadiene rubber (SBR) composites filled with hemp hurd powder (HP) were prepared with bis(3‐triethoxysilylpropyl) tetrasulfide (Si69) as a coupling agent. The effects of the filler content and coupling agent on the curing characteristics and dynamic mechanical properties of the composites were studie…
Abstract Factorial design analysis was applied to optimize the synthesis, via a new route, of N , N , N ‐trimethylchitosan, based on dimethylsulfate as a methylating agent. The responses analyzed were weight yield, solubility and average degree of quaternization. Temperature was verified as the most important variable…
Modulation of plasmon transport between silver nanoparticles by a yellow fluorophore, tartrazine, is studied theoretically. The system is studied by combining a finite-difference time-domain Maxwell treatment of the electric field and the plasmons with a time-dependent parameterized method number 3 simulation of the t…
We report on the use of the self-organization process of sputtered gold nanoparticles on a self-assembled block copolymer film deposited by horizontal precipitation Langmuir-Blodgett (HP-LB) method. The morphology and the phase-separation of a film of poly-n-butylacrylate-block-polyacrylic acid (PnBuA-b-PAA) were stud…
Equivalent strains up to a value of ≈2.7 were determined by evaluation of the shape changes of the phases in a duplex α(fcc)/β(bcc) microstructure formed ahead of the pin tool extraction site during the friction stir processing (FSP) thermomechanical cycle in a cast NiAl bronze alloy. Correlation of the local strains…
Abstract Nanocomposites of blends of polymethylmethacrylate (PMMA) and poly(styrene‐ co ‐acrylonitrile) (SAN) with multi‐walled carbon nanotubes (MWCNTs) were prepared by melt mixing in a twin‐screw extruder. The dispersion state of MWCNTs in the matrix polymers was investigated using transmission electron microscopy.…
Abstract In this work, we present a detailed Raman scattering study to clarify the origin of the mode at 379 cm −1 which is observed in Raman spectra of the ZnO films grown on c‐sapphire substrates and generally attributed to the A 1 ‐transverse optical ( A 1 ‐TO) mode of ZnO. The studied ZnO films were deposited by m…