Materials Literature
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In this study, we report the ultrafast dissociation and recombination dynamics of I 2 enclosed in well-defined cages formed by the electroneutral host framework of the crystalline microporous SiO 2 modification decadodecasil 3R (DDR). In this composite, each cage is occupied by one guest molecule, corresponding to a h…
High Pure Wurtzite structure GaN has been synthesized by gas reaction method. Its structure was determined by powder X-ray diffraction using the Rietveld technique. The positions in the unit cell for Ga and N were refined to be (0, 0, 0) and (0, 0, 0.3814). The Debye temperature was determined as 586 K from the refine…
In off-equilibrium dynamics we define a dynamical correlation length that is proportional to the size of the region in which the atoms move in a correlated way. General arguments indicate that this dynamical correlation length diverges at large times in the glassy phase. Numerical simulations for binary mixtures are c…
The synthesis of a series of vinyl-substituted silphenylene siloxane polymers of high molecular weight is described. 29 Si NMR spectroscopy indicates that the polymers possess an exactly alternating microstructure of the silphenylene and siloxane moieties. The materials are completely amorphous with glass transition t…
Geraniol and its 1-methyl derivative (regiochemical probes) and a set of methyl- and tert-butyl-substituted chiral allylic alcohols (stereochemical probes) have been used to elucidate the mechanism of the MTO-catalyzed epoxidation of allylic alcohols. The regiochemical probes are preferentially epoxidized at the unfun…
α-CsPbBi 3 Se 6 ( I ), β-CsPbBi 3 Se 6 ( II ), RbPbBi 3 Se 6 ( III ), KPbBi 3 Se 6 ( IV ), CsPbBi 3 S 6 ( V ), and RbPbBi 3 S 6 ( VI ) were synthesized by the polychalcogenide flux method. α-CsPbBi 3 Se 6 was obtained at 720 °C and crystallizes in the space group Pnma (no. 62) with a = 23.564(6) Å, b = 4.210(2) Å, c =…
The effect of high pressure on lactate dehydrogenase (LDH) was studied using small-angle X-ray scattering (SAXS). The SAXS results are interpreted in terms of the dissociation and association of LDH within a compression and decompression cycle and its temperature dependence. LDH consists of four identical subunits. At…
The highly efficient photoluminescence (PL) from diamond nanoparticles of different size (diameter) D = 5, 100, 400, 700, and 1000 nm was observed. The PL was induced by laser pulsed ultraviolet (UV) light [λ exc = 354.7 nm (3.48 eV), τ = 10 ns] as well as by the infrared (IR) one [λ exc = 1064 nm (1.16 eV), τ = 10 ns…
The interaction of D 2 O with the CeO 2 (001) surface was studied with temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). It was found with TPD that D 2 O desorption occurs in three states with temperatures of 152, 200, and 275 K, which are defined as multilayer D 2 O, weakly bound sur…
In this paper, we investigate theoretically the structure of an ultrathin layer of diblock copolymers. It is assumed that one of the blocks is strongly adsorbed on a planar surface while the nonadsorbed block aggregates with the formation of surface micelles. We adopt a simple model in which the adsorbed blocks of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTCatalytic Cross-Dehydrocoupling Polymerization of 1,4-Bis(dimethylsilyl)benzene with Water. A New Approach to Poly[(oxydimethylsilylene)(1,4-phenylene)(dimethylsilylene)]Yuning Li and Yusuke KawakamiView Author Information Graduate…
Using numerical and analytical self-consistent field (SCF) calculations, we investigate the interactions between two closely spaced surfaces and the surrounding polymer melt, which contains a volume fraction of end-functionalized polymers. The functionalized polymers contain two reactive “stickers”, one at each end of…
The diffusion process in supercooled liquid water has been studied by a series of molecular dynamics simulations using systems of 216 ST2-model molecules in the temperature range between 255 and 360 K. In contrast to SPC/E water ( Phys. Rev. E 1996, 54, 6331), the ST2 liquid does not show the appearance of a kinetic g…
Corn zein has been investigated for fabrication of biodegradable packaging materials. Our objective was to investigate the effect of added plasticizers, oleic and linoleic acids, on tensile properties and water absorption of zein sheets. Moldable resins were precipitated from aqueous ethanol dispersions of zein and fa…
This paper describes the fabrication of microtubular biosensors and sensor arrays based on polyaniline with superior transducing ability. These sensors have been tested for the estimation of glucose, urea, and triglycerides. As compared to that of a macro sensor, the response of the microtubular sensor for glucose is…
Three isomers of manganese(III) 5,10,15, 20-tetrakis(N-methylpyridyl)porphyrin (MnTMPyP) were evaluated for their reaction with peroxynitrite. The Mn(III) complexes reacted with peroxynitrite anion with rate constants of 1.85 x 10(7), 3.82 x 10(6), and 4.33 x 10(6) M(-1) s(-1) at 37 degrees C for MnTM-2-PyP, MnTM-3-Py…
Electrochemical doping of bisulfate ions into single wall carbon nanotube (SWNT) bundles has been studied using coulometry, cyclic voltammetry, mass-uptake measurements, and Raman scattering experiments. A spontaneous charge-transfer reaction is observed prior to the application of an electrochemical driving force, in…
Diffractive optical elements are rapidly finding their way into many practical optical systems, and this has given rise to a spurt of research and developmental activities in this area. IN this paper, the history of these elements is first traced to get a perspective on their current state-of-the- art. The important f…
The concept of characteristic curves (CCs) for analysing the behaviour of limit cycles in elementary DC-DC switching converters is introduced. The CC is derived by considering opposite vector fields in the on and off configurations. Feedback regulated converters with PWM or hysteresis control are investigated using th…
Phosphorescence and optically detected magnetic resonance (ODMR) measurements are reported on four single-tryptophan mutants of lac repressor protein from Escherichia coli: H74W/Wless, W201Y, Y273W/Wless, and F293W/Wless, where Wless represents a protein background containing the double mutation W201Y/W220Y. The singl…