Materials Literature
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Polystyrene (PS)/layered silicate nanocomposites are prepared by the melt blending technique. Na-MMT is modified with stearyltrimethyl ammonium chloride to evaluate the effect of clay modification on the performance of the nanocomposites. A comparative account with the nanocomposites prepared using commercial clay clo…
The cryocooling of protein crystals to temperatures of around 100 K drastically reduces X-ray-induced radiation damage. The majority of macromolecular data collection is therefore performed at 100 K, yielding diffraction data of higher resolution and allowing structure determination from much smaller crystals. However…
A method and a device for the promotion of crystal growth by keeping the crystallization solution metastable during the growth process are described. This is achieved by controlled temperature variation of the crystallization solution using parameters determined in situ during the growth process. The technique finds a…
This work deals with a new strategy for the elaboration of macro- to nanoporous materials. The adopted scheme involves the in-situ generation of foaming agents (CO 2 and isobutene) during the thermal treatment of a poly(phenylquinoxaline) (PPQ) film bearing thermolabile ( tert -butyloxycarbonyl, i.e., Boc) groups (PPQ…
Various defects--either bright or dark triangular defects--are observed on the (001) titanium disulfide surface by ultrahigh vacuum scanning tunneling microscopy. The experimental interpretations of the images available in the literature suggest that a fraction of Ti atoms could be displaced from the octahedral site t…
Abstract The high‐pressure melt‐crystallization behaviors of poly( p ‐phenylene sulfide) (PPS) were investigated using WAXD, DSC, TEM and SEM. PPS extended‐chain crystals with c ‐axis thickness exceeding 4.5 µm were formed at high pressure. The DSC results showed that the melting temperature and melting enthalpy of hi…
The thermal degradation of blends of different percentages of low-density polyethylene (LDPE) in vacuum gas oil (VGO) has been carried out in a fluidized-bed reactor. A wide range of percentages of the polymer has been selected for the study, including 0, 5, 25, 75, and 100% LDPE by weight. The strategy of mixing plas…
A high-density polyethylene (HDPE) is compounded with surfacetreated mica in a twin-screw extruder, with filler weight fractions (ø f ) of 5, 10, and 15%. The tensile, flexural, impact, heat distortion temperature and melt flow properties of the composites are measured to identify the effect of mica loading on these p…
Abstract The new copper(II) 15‐metallacrown‐5 complexes with the central metal ions Pb II , Hg II , Ag I , Na I and Y III , with the formula [MCu 5 L 5 ]X n {H 2 L is 2‐picolinehydroxamic acid or ( S )‐phenylalaninehydroxamic acid and X – is NO 3 – or Cl – }, have been synthesised and characterised by NMR and UV/Vis s…
Recently, the hypothesis was advanced that protein crystallization could be driven by the inclusion of small molecules rich in hydrogen-bonding, hydrophobic and electrostatic bonding possibilities. Conventional organic and biologically active molecules would promote lattice formation by their mediation of intermolecul…
Abstract The effects of the dynamic polymerization method and temperature on the molecular aggregation structure and the mechanical and melting properties of thermoplastic polyurethanes (TPUs) were successfully clarified. TPUs were prepared from poly (ethylene adipate) glycol ( M n = 2074), 4,4′‐diphenylmethane diisoc…
Abstract Prolonged exposure (>90 days) of bovine β‐lactoglobulin (BLG) to subdenaturing concentrations of either urea or potassium thiocyanate resulted in the formation of ordered polymers in the form of fibrils. The fibrils obtained with each chaotrope showed major differences in morphology, surface properties, th…
The authors have studied the structural evolution of the fragile glass-forming liquid CaAl2O4 during supercooling from the stable liquid phase to the cold glass below Tg. The evolution is characterized by a sharpening of the first diffraction peak and a shortening of the average nearest-neighbor bond length around 1.2…
In situ transmission electron microscopy studies have been carried out to determine the effect of temperature and pressure on the growth of carbon nanotubes by the Ni-catalyzed chemical vapour deposition of acetylene. The temperature range explored was 450–650 °C and the acetylene pressure range was 0.8–20 mTorr. Our…
Elucidation of the molecular composition and physical properties of spider glue is necessary to understand its function in the mechanics of the web and prey capture. Previous reports have indicated that components of the adhesive coating contain inorganic molecules, phosphorylated glycoproteins, lipids, and organic lo…
The authors study the combination of two independent strategies that enhance the hyperpolarizability of ionic organic chromophores. The first molecular-level strategy is the extension of the conjugation path in the active chromophore. The second supramolecular-level strategy is the bottom-up nanoengineering of an incl…
Bis(benzofuranonyl)methanolate (BM4i4i) dye and croconate dyes (derivatives of oxyallyl molecules) in general are known to have intense transitions in the near-infrared (NIR) region, indicating small transition energies and large transition dipole moments. These molecules have been reported in the literature to have v…
We have recently proposed a mechanism for the epoxidation of cyclooctene by H2O2 catalyzed by iron(III) [tetrakis(pentafluorophenyl)]porphyrin chloride, (F20TPP)FeCl, in solvent containing methanol [Stephenson, N. A.; Bell, A.T. Inorg. Chem. 2006, 45, 2758-2766]. In that study, we found that catalysis did not occur un…
We have characterized a montmorillonite-based organoclay dispersed in three different nonaqueous solvents using a combination of x-ray scattering, small-angle neutron scattering (SANS), and ultrasmall angle neutron scattering (USANS), together with rheological measurements. Consistent with these measurements, we prese…
The adsorption of Pd-isolated atoms and dimers on the (110) surface of rutile TiO 2 has been investigated in a range of coverage using a periodic supercell approach within density functional theory using a generalized gradient approach and plane-wave basis sets. Pd atoms prefer to adsorb on the surface channels near t…