Materials Literature
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Abstract The Raman spectra of a tubular halloysite originating from Matauri Bay, New Zealand, have been obtained using a Renishaw 1000 Raman microscope system. The Raman microprobe enables the Raman spectra of crystals as small as 0.8 μm diameter to be obtained over the complete wavelength range and allows spectral va…
The interactions of various pyrimidines (1,3-dimethylthymine, DMT, 1,3-bis( N 4, N 4 -dimethylcytosin-1-yl)propane, DMC) and their corresponding cis - syn cyclobutane dimers (DMTD and DMCD) with a series of excited-state electron donors were examined with the goal of understanding the energetics and mechanism of UV re…
Three-dimensional solution structures for three engineered, synthetic CBDs (Y5A, Y31A, and Y32A) of cellobiohydrolase I (CBHI) from Trichoderma reesei were studied with nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy. According to CD measurements the antiparallel beta-sheet structure of the C…
Generations 1−5 of poly(amidoamine) (PAMAM) dendrimers were peripherally modified with cationically substituted naphthalene diimides. Reduction with sodium dithionite in water or formamide formed anion radicals on the diimide moieties. Evaporation of water under argon produced powders of the reduced dendrimers that we…
The interface between the (110) crystal face of cellulose Iβ and water was studied by molecular dynamics simulation with cellulose coordinates refined from electron diffraction data as a starting point. Potential energies, pucker parameters, torsion angles, and hydrogen bonding have been used for the characterization.…
The effect of barium (Ba) and strontium (Sr) additions on the electrical properties of lead lanthanum zirconate stannate titanate (PLZST) ceramics and their electrically induced phase change behavior was examined. Sr additions decreased both the ferroelectric (FE) ↔ antiferroelectric (AFE) transition temperature ( T A…
The influence of laser light irradiation at the surface plasmon frequency of the gold nanoparticles suspended in 2-propanol is examined by the UV−vis absorption spectral measurement and also by a transmission electron microscope. It has been found that the laser light irradiation on the colloidal suspension causes coa…
A detailed derivation of the extended Jones matrix representation for twisted nematic liquid crystal displays at oblique incidence (which was previously published by the author) is given. It is shown that this representation reduces to the well-known ordinary Jones matrix representation at normal incidence.
Using a special technique for measuring the saturation magnetization at temperatures close to the Curie point, we demonstrate that in ${\mathrm{La}}_{0.7}$${\mathrm{Sr}}_{0.3}$${\mathrm{MnO}}_{3}$ the magnetic phase transition is continuous.
A series of unsymmetric π-donor−acceptor (D/A) bis(phenylethynyl)benzenes was prepared in a two-step sequence via Pd/Cu catalyzed cross-coupling reactions of 1,4-diiodobenzene and the corresponding 4-p-R-phenylethynes. Related unsymmetric D/A platinum trans-bis(acetylide) complexes were also prepared in a stepwise fas…
The density distribution of geometrically necessary dislocations, which accompany the gradient of plastic slip strain on slip systems, is evaluated by a finite-element technique. As a numerical example, the bending of a single-crystal plate is analysed. The result obtained for the density distribution of dislocations…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTUltrathin Polymer Films near the Glass Transition: Effect on the Distribution of α-Relaxation Times As Measured by Second Harmonic GenerationDavid B. Hall, Jacob C. Hooker, and John M. TorkelsonView Author Information Department of…
A heat-labile beta-lactamase has been purified from culture supernatants of Psychrobacter immobilis A5 grown at 4 degrees C and the corresponding chromosomal ampC gene has been cloned and sequenced. All structural and kinetic properties clearly relate this enzyme to class C beta-lactamases. The kinetic parameters of P…
Abstract This study investigates the mechanical properties of wood‐fiber/toughened PP composite modified by physical blending with an EPDM rubber to improve impact toughness. Wood‐fiber thermoplastic composites were prepared with a modified PP matrix resin, employing high shear thermokinetic compounding aided with mal…
Viscosity curves were measured for polydimethyl siloxane (PDMS) melts swollen with dissolved carbon dioxide at 50 and 80°C for shear rates ranging from 40 to 2300 s−1, and for carbon dioxide contents ranging from 0 to 21 wt %. The measurements were performed with a capillary extrusion rheometer modified for sealed, hi…
The electroactivity of zeolite-encapsulated redox-active transition metal complexes, {M(L)}Z, was explored for Co(salen) and [Fe(bpy) 3 ] 2+ formed in NaY zeolite (where salen = N, N‘ -bis(salicylidene)ethylenediamine and bpy = 2,2‘-bipyridine). The zeolite boundary was characterized via X-ray photoelectron spectrosco…
The distribution of yttrium and lanthanum dopants has been mapped in yttrium‐ and lanthanum‐doped polycrystalline aluminas using imaging secondary‐ion mass spectrometry (imaging‐SIMS). Both dopants segregate to grain boundaries and pore surfaces. On average, yttrium occupies 7.1%–9.0% of the available grain‐boundary c…
π-Conjugate polymers, polyanilines and polypyrroles, served as catalysts in dehydrogenative oxidation reactions of benzylamines, 2-phenylglycine, and 2,6-di- tert -butylphenol under oxygen. The catalytic activity was controlled by protonic acid doping. The reversible redox of the polyaniline catalyst under oxygen was…
The synthesis of low molecular weight ( M̄ n (NMR) < 27 000 g/mol) lactic acid polymers by condensation polymerization of l -lactic acid was investigated. All polymerizations were carried out in the melt, using different catalysts and polymerization temperatures. The products were characterized by DSC, GPC, titrimetri…
Single crystals of bacterial poly[( R )-3-hydroxybutyrate] (P(3HB)) with different molecular weights ( M n = 2500 and M n = 48 000) were prepared in a mixture of chloroform and ethanol. The enzymatic degradation of P(3HB) single crystals with extracellular PHB depolymerase purified from Pseudomonas stutzeri YM1006 was…