Materials Literature
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Three double hydrophilic block copolymers were used as crystal-growth modifiers of DL-alanine to generate amorphous precursor nanoparticles that undergo subsequent mesoscopic transformation to core-shell mesostructures and hollow tubes with quadratic cross-sections. The growth sequence can be stopped at various stages…
Enzyme I (EI) is the phosphoenolpyruvate (PEP)-protein phosphotransferase at the entry point of the PEP-dependent sugar phosphotransferase system, which catalyzes carbohydrate uptake into bacterial cells. In the first step of this pathway EI phosphorylates the heat-stable phospho carrier protein at His-15 using PEP as…
Abstract A mesogenic‐type curing agent was synthesized to introduce a mesogenic group not only into epoxy resin backbones but also into the crosslink units. In the mesogenic curing agent system, the domain size became larger, and the network arrangement in each domain existed to a greater extent than that in a system…
The present study applies the power spectral analysis technique to understand the diffusional anomaly in liquid silica, modeled using the Beest-Kramer-van Santen (BKS) potential. Molecular-dynamics simulations have been carried out to show that power spectrum of tagged particle potential energy of silica shows a regim…
Abstract The effects of molecular characteristics and processing conditions on melt‐drawing behavior of ultrahigh molecular weight polyethylene (UHMW‐PE) are discussed, based on a combination of in situ X‐ray measurement and stress–strain behavior. The sample films of metallocene‐ and Ziegler‐catalyzed UHMW‐PEs with a…
The electrothermal simulator developed in this work uses an iterative procedure that self-consistently couples a Monte Carlo electronic trajectory simulation with a fast Fourier series solution of the heat diffusion equation. Results presented in this paper are obtained from the simulation of In0.15Ga0.85As/Al0.28Ga0.…
In this letter, the radio-frequency (RF) transmission properties of single-walled carbon nanotubes (CNTs) have been characterized up to the frequency of 12 GHz in a carbon nanotube field-effect transistor (CNFET) configuration using a two-port S-parameter method for the first time. The RF characteristics of the CNTs w…
Vibrational spectra of BH(4)(-) and its isotopic analogues in a crystalline environment of alkali metals cations (K(+), Rb(+), Cs(+)) have been investigated beyond the harmonic approximation using a variational approach supported by computations of B3LYP type anharmonic force fields. From the comparison of the observe…
Metal catalyzed, CVD-grown silicon nanowires decorated by chemical assembly of closely spaced Ag nanocrystals were modified with the well-known "silver mirror" reaction and investigated as substrates for surface-enhanced Raman (SERS) and hyper-Raman (SEHRS) spectroscopy. Four chromophores were examined: Rhodamine 6G,…
Abstract The crystal unit‐cell structures and the isothermal crystallization kinetics of poly( L ‐lactide) in biodegradable poly( L ‐lactide)‐ block ‐methoxy poly(ethylene glycol) (PLLA‐ b ‐MePEG) diblock copolymers have been analyzed by wide‐angle X‐ray diffraction and differential scanning calorimetry. In particular…
Aggregation in coordinating solvents: A giant oxido cluster [Bi38O45(hfac)24] (hfac=hexafluoroacetylacetonate), formed in solutions of bismuth oxido diketonate [Bi9O7(hfac)13], has been isolated and fully characterized. The [Bi38O45]24+ core (see picture: orange Bi, red O; central Bi6O9 unit is highlighted) is capped…
Tissue engineering requires the delivery and survival of cells to organ sites needing repair. Previously, we showed that an active laminin peptide (AG73: RKR-LQVQLSIRT)-conjugated chitosan membrane promoted cell adhesion and spreading in vitro. Here, we seeded human keratinocytes onto AG73-chitosan membranes and found…
Abstract The work details the electrocatalysis of oxygen reduction reaction (ORR) in 0.5 M H 2 SO 4 medium on a modified electrode containing a film of polyaniline (PANI) grafted multi‐wall carbon nanotube (MWNT) over the surface of glassy carbon electrode. We have fabricated a novel modified electrode in which conduc…
In this letter, the authors report on the high-frequency (HF) performance of self-assembled carbon nanotube field-effect transistors. HF device structures including a large number of single-wall carbon nanotubes have been designed and optimized in order to establish a new state of the art. The device exhibits a curren…
Nonthermal RF plasma modification has been applied to alumina-supported Pd catalysts for selective hydrogenation of acetylene in the presence of ethylene. High ethylene selectivity and good acetylene conversion activity were obtained at low temperatures on the H 2 plasma-treated catalyst without the in situ reduction…
We report a calibration-free method for the determination of chiral indices $(n,m)$ of single-walled carbon nanotubes from their electron diffraction patterns based on Bessel function analysis of the diffracted layer lines. An approach has been developed for confident identification of the orders of the Bessel functio…
The well-defined one-electron steps in the voltammetry of solutions of the nanoparticles Au38(SC2Ph)24 and Au140(SC6)53 (SC2Ph = phenylethanethiolate; SC6 = hexanethiolate) enable preparation of solutions containing, for example, Au38(SC2Ph)24 and Au38(SC2Ph)24+(ClO4)- nanoparticles in known relative proportions. From…
We report pump-probe transient absorption spectroscopy on carbon nanotubes with a high initial excitation density. We find that the recovery of the ground state optical absorption is well described by a $1∕\sqrt{t}$ relaxation, indicating that the long time population relaxation is controlled by one-dimensional diffus…
The anion-exchange properties of second-stage [Zn 2 Cr(OH) 6 ]Cl 0.5 (succinate) 0.25 · n H 2 O (Zn 2 Cr-Succ/Cl) and [Zn 2 Cr(OH) 6 ]Cl 0.5 (tartrate) 0.25 · n H 2 O (Zn 2 Cr-Tart/Cl) materials were investigated by means of time-resolved in situ energy-dispersive X-ray diffraction (EDXRD). Selective anion-exchange re…
Eines nach dem anderen: Dünne Filme der [Fe(pyrazin){M(CN)4}]-Koordinationspolymere (M=Ni, Pd oder Pt) wurden sequenziell durch koordiniertes Binden an Goldoberflächen erhalten (siehe Schema). Diese Multischichten zeigen bei Raumtemperatur Spin-Crossover-Phänomene mit Hysterese.