Materials Literature
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Abstract A water‐soluble cationic copolymer dispersion was prepared by the polymerization of the cationic monomer (2‐methacryloyloxyethyl)trimethyl ammonium chloride and acrylamide initiated with 60 Co γ‐rays. The polymerization was carried out in a salt solution that did not dissolve the resulting copolymer and in th…
Abstract This study investigated some relevant structure/properties relationships in shear‐controlled orientation in injection molding (SCORIM) of high‐density polyethylene (HDPE). SCORIM was used to deliberately induce a strong anisotropic character in the HDPE microstructure. Three grades with different molecular we…
Vegetable tannins are widely distributed in the plant kingdom. In many cases, it is necessary to remove tannins from natural beverages and medicinal plant extracts due to their physiological toxicity. In the present work, an adsorbent for this purpose was prepared on the basis of hide collagen fibers. Its adsorption s…
Abstract The miscibility, crystallization behavior, tensile properties, and environmental biodegradability of poly(β‐hydroxybutyrate) (PHB)/cellulose acetate butyrate (CAB) blends were studied with differential scanning calorimetry, scanning electron microscopy, wide‐angle X‐ray diffraction, and polarizing optical mic…
A complex atomic relaxation pattern for hydrogen-saturated Ge and Si nanocrystallites with diameters between 10 and 25 \AA{} has been found by means of ab initio calculations. While the bonds at the center of the nanocrystals expand beyond their length in the corresponding bulk material, the bonds near the surface are…
Motivated by a collection of experimental results indicating the strongly correlated nature of the ferromagnetic metallic state of CrO2, we present results based on a combination of the actual band structure with dynamical-mean-field theory for the multiorbital case. In striking contrast to LSDA(+U) and model many-bod…
Gold and silver colloids display strong colors as a result of electron oscillations induced by incident light, which are referred to as the plasmon absorption. This absorption is dependent on colloid-colloid proximity, which has been the basis of absorption assays using colloids. We now describe a new approach to opti…
The formation of MoO(3) and its spontaneous spread over an Au (111) surface have been studied by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). Metallic Mo clusters grown by Mo(CO)(6) chemical vapor deposition (CVD) have a constant size independent of the Mo coverage. Molecular oxygen…
HisH-hisF is a multidomain globular protein complex; hisH is a class I glutamine amidotransferase that hydrolyzes glutamine to form ammonia, and hisF is a (beta/alpha)8 barrel cyclase that completes the ring formation of imidizole glycerol phosphate synthase. Together, hisH and hisF form a glutamine amidotransferase t…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPoly(salphenyleneethynylene)s: A New Class of Soluble, Conjugated, Metal-Containing PolymersAlfred C. W. Leung, Jonathan H. Chong, Brian O. Patrick, and Mark J. MacLachlanView Author Information Department of Chemistry, University o…
The effect of hydrostatic pressure ($P$) on closed-loop phase behavior of deuterated polystyrene-block-poly($n$-pentyl methacrylate) copolymers [dPS-PnPMA] was investigated by using small-angle neutron scattering and birefringence. For $P<20.7\text{ }\mathrm{b}\mathrm{a}\mathrm{r}$, dPS-PnPMA exhibited a lower diso…
Abstract In this study, emeraldine base (EB)‐form polyaniline (PANI) powder was chemically prepared in 1 M HNO 3 aqueous solution. The thermal characteristics and chemical structures of this powder were studied by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared spe…
Mn 2+ -doped ZnSe nanoparticles were synthesized from molecular cluster precursors. Four ZnSe nanoparticle samples, one with low Mn 2+ concentration (A), one with an intermediate Mn 2+ concentration (B), one with a high Mn 2+ concentration (C), and one with no Mn 2+, were prepared and characterized using UV−vis, lumin…
The CO + NO reaction (2CO + 2NO --> N(2) + 2CO(2)) on small size-selected palladium clusters supported on thin MgO(100) films reveals distinct size effects in the size range Pd(n) with n < or = 30. Clusters up to the tetramer are inert, while larger clusters form CO(2) at around 300 K, and this main reaction mechanism…
Nickel titanium (NiTi) shape memory alloys have been investigated for several years with regard to biomedical applications. However, little is known about the influences of surface modifications on the biocompatibility of these alloys. The effects of a range of surface treatments were investigated. Cytotoxicity and cy…
The method of rapid expansion of a supercritical solution into a liquid solvent (RESOLV) was applied to the preparation of bovine serum albumin protein-conjugated silver sulfide nanoparticles. The conjugate samples were characterized by using a series of instrumental techniques. The results show that the monodispersed…
The platinum diimine bis(acetylide) chromophore was utilized to explore photoinduced intramolecular reductive quenching with phenothiazine donors in chromophore-donor dyad complexes. Compounds of the general formula Pt(X(2)-bpy)(C triple bond C-p-C(6)H(4)CH(2)(D))(2) (where D = phenothiazine (PTZ) or trifluromethylphe…
The characteristic properties of a new class of long chain branched isotactic polypropylene (LCB-iPP) polymers and the effects of its molecular architecture on the nature of orientation-induced crystallization precursor structures and crystallization kinetics in flow were investigated. In these polymers, long chain br…
Using DSC scans and NMR line-shape analysis we have investigated the thermal properties of orientationally disordered crystal forming cyclohexane and benzene confined in highly ordered mesoporous materials MCM-41 and SBA-15. Phase transition temperatures and nature of the phases as a function of temperature were deter…
We have measured the heat capacities of $δ-$Pu$_{0.95}$Al$_{0.05}$ and $α-$Pu over the temperature range 2-303 K. The availability of data below 10 K plus an estimate of the phonon contribution to the heat capacity based on recent neutron-scattering experiments on the same sample enable us to make a reliable deduction…