Materials Literature
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We use atomistic simulations with an empirical potential (EAM) to study the elastic effects of heteroepitaxial islands on adatom diffusion. We measure the diffusion barrier on pure stressed substrate and near a misfit island, as well as the detachment barrier from islands of different size.
This Comment concerns the effective dielectric constant for 2D photonic crystal. We show that even in the limit of very high dielectric constant of photonic crystal's "atoms", static and quasistatic approaches give the same results, unlike it was claimed by Nicorovichi et al, PRL, 75, 1507 (1995).
The dynamics of block copolymer micelles, with a glassy polystyrene core and polyisoprene corona, in a matrix of linear entangled polyisoprene (PI) chains, has been investigated by forced Rayleigh scattering (FRS), dynamic mechanical measurements, and dielectric relaxation spectroscopy. The concentration of micelles h…
Mass transport of six food aroma components, D-limonene, n-decane, ethyl caproate, phenylethanol, 1-hexanol, and hexanal, through three sealable polymer films suitable for direct food contact, ultra-low-density polyethylene (ULDPE), ionomer (ION), and modified polyester (mPET), was analyzed by permeation experiments.…
The enhancement of the NO/carbon reduction reactions by carbon monoxide has been demonstrated for carbons of widely varying nature (coal char, phenolic resin-derived char and graphite). The evidence supports enhancement of NO reduction via a carbon-surface-catalyzed reaction such as NO + CO → 1/2N 2 + CO 2 . This reac…
The synthesis, spectral and structural characterization of meso -aryl sapphyrins and rubyrins containing heteroatoms such as S, O, Se in addition to pyrrole nitrogens are reported. The synthesis of the desired expanded porphyrins has been achieved using a single precursor, the modified tripyrranes containing heteroato…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOn−Off Control of Enzymatic Activity Synchronizing with Reversible Formation of Supramolecular Assembly from Enzyme and Charged Block CopolymersAtsushi Harada and Kazunori KataokaView Author Information Department of Materials Science, Graduate School of Engineering, T…
We report the design of polymer/lipid composite films on polarizable indium−tin−oxide (ITO) electrodes and the characterization of their electrical properties by impedance spectroscopy. The polymer films separating the solid surfaces and the lipid membranes were composed of “ hairy-rod ” macromolecules and provided a…
Poly(vinyl chloride- co -vinyl acetate- co -maleic acid) (vinyl chloride 83%, vinyl acetate 13%, carboxylated 1%) was found to be a substrate favoring the deposition of vaterite crystals from stable supersaturated solutions at pH 8.50 and 25 °C. Induction times preceding calcium carbonate precipitation were inversely…
Deprotonated and protonated forms of L-tyrosine or L-phenylalanine were intercalated by Zn-Al hydrotalcite (HT) and Na-montmorillonite (Na-mont), respectively. The intercalated materials were characterized by powder X-ray diffraction, BET measurements, and FT-IR spectroscopy. Intercalation was successful as the increa…
Radical solution polymerization of triallyl isocyanurate was conducted in methyl benzoate or hexyl benzoate as good or poor solvent, respectively, using AIBN as initiator at 60°C. An increased rate of polymerization, enlarged primary chain length, and promoted gelation were observed in the poor solvent. The actual gel…
A design method is presented that enables the realization of a novel type of incoupling waveguide hologram (IWGH) that simultaneously focuses the incoupled light to any desired positions in the waveguide. IWGH's, or grating couplers, are gratinglike structures etched into the waveguide surface. They couple the light i…
Charge trapping induced by hot carriers in a metal–oxide–semiconductor capacitor was studied with a scanning capacitance microscope (SCM). The local charge trapping/detrapping and the readout of the trapped charge in SiO2 was performed using a SCM combined with an atomic force microscope. When applying a voltage betwe…
Using tight-binding molecular dynamics, we have constructed structural models of amorphous carbon surfaces, by imposing tensile strain on computer generated networks containing 512 carbon atoms until fracture is produced and two surfaces are formed. Different tensile strains are applied along different directions, in…
We demonstrate the existence of intrinsic gap states in bare and capped semiconductor nanocrystals within multiband effective mass theory. These states originate from Shockley-like surface states which, in small nanocrystals, extend over the entire crystal volume, facilitating their observation in absorption as well a…
Leakage conduction of (Pb, La)(Zr, Ti)O3 (PLZT) films grown on Pt bottom electrode, with Pt and Pt/SrRuO3 (Pt/SRO) top electrodes is studied. It is found that the conduction behavior of the ferroelectric capacitors strongly varies depending on the degree of interdiffusion from the electrode into the ferroelectric mate…
We observed the quantum-confined band edge emission from ZnSe quantum dots and the size dependence of the energy states, spin-orbit interaction, and Stokes shift. The band edge emission occurs in the ultraviolet blue. The energy gap=Eg+C/dn where d is the diameter and n is 1.19±0.13 and 1.21±0.13 for the first and sec…
We directly show the evolution of the electronic structure of semiconductor quantum dots (QDs) with QD size in the strong confinement regime by employing low-temperature tunneling current–voltage spectroscopy to individual electrodeposited CdSe QDs. From the spectra we measure the values of Eg, map discrete energy lev…
We present new results on the zero-field magnetic relaxation in a single crystal of M${\mathrm{n}}_{12}$ acetate. We find three relaxation regimes. Above 2.8 K, the relaxation is exponential. Below this temperature, deviations are observed. These deviations are more pronounced when temperature decreases between 2.4 an…
The luminescence characteristics of laser-created bubbles in water have been studied for pressures between 1 and 15 bars. A fast peak in the luminescence is correlated with the first collapse point of the bubble. The width of the light pulse is several nanoseconds, and increases with the bubble size. With increasing p…