Materials Literature
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Although macromolecular crystallography is rapidly becoming largely routine owing to advances in methods of data collection, structure solution and refinement, difficult cases are still common. To remind structural biologists about the kinds of crystallographic difficulties that might be encountered, case studies of s…
Abstract Three methacrylate‐based copolymers [i.e., poly(methacrylic acid‐co‐methyl methacrylate), poly(ethyl acrylate‐co‐methyl methacrylate‐co‐trimethyl‐ammonioethyl methacrylate chloride), and poly(butyl methacrylate–co‐(2‐dimethylaminoethyl) methacrylate‐co‐methyl methacrylate)] were successfully electrospun into…
Abstract EVOH nanocomposites containing organically treated clays are unique systems in which the clay is strongly attracted to EVOH, thus affecting the morphology and the resultant thermal and mechanical properties. A strong effect of the processing conditions on morphology, thermal, and mechanical properties was obs…
A systematic density functional theory study has been carried out on the structure and stability of triangular molybdenum sulfide (MoS(x)()) models. On the basis of the structural and energetic comparison, the triangle Mo(28)S(84) (VII) cluster has been identified as a reasonable structure for triangular MoS(x)() mode…
Abstract Oxidative polymerization of bromoiron(III) meso ‐tetrakis(3‐thienyl)porphyrin gave a novel polymeric porphyrin complex randomly crosslinked at the 2,5‐positions of the peripheral thienyl groups. The electrical semiconductivity of ca . 10 −5 S/cm after I 2 doping indicated that the polymer had a π ‐conjugated…
Thermoreversible gels of poly(vinylidene fluoride) (PVF 2 ) in organic diesters [(CH 2 ) n −(COOEt) 2 ] were dried by replacing the high boiling diesters with a guest solvent cyclohexane and followed by leaching with methanol. The porosity of the samples was measured using mercury intrusion porosimetry (MIP) for pore…
The high-resolution soft x-ray photoelectron study of $\text{Heusler}(L{2}_{1})$-type ${({\mathrm{Fe}}_{2∕3}{\mathrm{V}}_{1∕3})}_{100\ensuremath{-}y}{\mathrm{Al}}_{y}$ $(y=23.8\ensuremath{-}25.8)$ alloys directly confirms the correlation between their thermoelectric properties and the electronic structures near the Fe…
A method is presented for generating computer models of biological tissues. The method uses properties of extracellular matrix proteins to predict the structure and physical chemistry of the elements that make up the tissue. The method begins with Protein Data Bank coordinate positions of amino acids as input into Tis…
The structure of crystalline porcine mitochondrial NADP-dependent isocitrate dehydrogenase (IDH) has been determined in complex with Mn2+-isocitrate. Based on structural alignment between this porcine enzyme and seven determined crystal structures of complexes of NADP with bacterial IDHs, Arg83, Thr311, and Asn328 wer…
Abstract The crystallization behavior of homogeneous and heterogeneous linear low‐density polyethylenes (LLDPE) was investigated by evaluating the characteristics of melting traces obtained by differential scanning calorimetry (DSC). Based on the isothermal experimental results, the concept of the effective nucleation…
Abstract Empirical formulas, which describe the air velocity and air temperature decays along the spinline of a dual slot die, are improved by introducing the influence of the ratio of die end width to air slot width. The thus‐improved empirical formulas include more die geometry parameters and are more accurate than…
The concepts of fracture mechanics that were derived prior to 1960 are applicable only to materials that obey Hooke’s law. Although corrections for small-scale plasticity were proposed as early as 1948, these analyses are restricted to structures whose global behavior is linear elastic.
The enzyme dienelactone hydrolase (DLH) has undergone directed evolution to produce a series of mutant proteins that have enhanced activity towards the non-physiological substrates alpha-naphthyl acetate and p-nitrophenyl acetate. In terms of steady-state kinetics, the mutations caused a drop in the K(m) for the hydro…
Abstract The crystallization behavior and morphology of polyoxymethylene (POM) and POM with polyamide (PA) were studied by polarized light microscopy (PLM), isothermal and nonisothermal differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The isothermal crystallization kinetics were analyze…
We have investigated the partial densities of states of Sr 2 FeMoO 6 by applying soft x-ray emission spectroscopy (XES) to the Fe L, the Mo M and the O K edges. We discuss the results in the light of complementary measurements of the valence band by means of x-ray photoelectron spectroscopy (XPS) and first-principles…
Abstract Crystal growth rates of paracetamol (4‐hydroxyacetanilide) have been determined by seeded isothermal desupersaturation experiments at 16 °C in 23 different solvent mixtures of water + acetone + toluene. Parameters of different growth rate equations have been estimated by direct nonlinear optimization. At equa…
Abstract An in‐line capillary rheometer nozzle equipped to a conventional reciprocating 55‐ton injection molding machine was used to study the viscosity of single phase low density polyethylene (LDPE)/chemical blowing agent (CBA) solutions under high shear rate in the concentration range of 0 to 5 wt%. The steady shea…
Overpoling phenomenon has been observed in flux-grown Pb(Mg1∕3Nb2∕3)O3–(31–32)%PbTiO3 single crystals when poled above 0.4kV∕mm at room temperature. This leads to increased property variations at intermediate poling fields (0.6–0.8kV∕mm) and to the degradation of piezoelectric properties at high poling fields (⩾1.0kV∕…
In this letter, we report on the study of nanoscale polarization relaxation phenomena in polycrystalline PbZr0.4Ti0.6O3 films. Piezoresponse force microscopy (PFM) images of the as-grown sample reveal grains with a range of contrast, from fully white to gray to fully black. It is shown that this local change in the co…
Photopyroelectric high resolution ac calorimetry has been used to study the nematic-isotropic phase transition in octylcyanobiphenyl liquid crystal incorporating an aerosil soft gel. We have found that the sample is not in thermodynamic equilibrium in the two phase coexistence region, as shown by the frequency depende…