Materials Literature
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The dynamical transition between the anomalous single file diffusion of highly confined fluids and bulk normal diffusion can be described by a phenomenological model involving a particle hopping time tau(hop). We suggest a theoretical formalism that will be useful for the calculation of tau(hop) for a variety of syste…
Abstract Biodegradable hollow microfibres containing particles loaded with specific active agents can be potentially employed to produce a special kind of substrate for tissue engineering, able to function as a scaffold and at the same time to act as a drug‐releasing system. Biodegradable hollow microfibres based on p…
The radical cation of the redox active ligand 3,4-dimethyl-3',4'-bis-(diphenylphosphino)-tetrathiafulvalene (P2) has been chemically and electrochemically generated and studied by EPR spectroscopy. Consistent with DFT calculations, the observed hyperfine structure (septet due to the two methyl groups) indicates a stro…
We have examined the effect of ordered silver nanocluster substrates on the surface-enhanced Raman spectrum of rhodamine 6G (R6G). Triangular shaped silver nanocluster arrays with order on the approximately 100 mum range were prepared using nanosphere lithography. Direct comparisons of R6G surface-enhanced Raman spect…
A functionalized poly(ethylene glycol) (PEG) layer possessing a reactive aldehyde group at the free end of the tethered PEG chain was constructed by simple coating on the substrate, using the acetal-PEG/poly(DL-lactide) block copolymer, followed by the hydrolysis of the acetal end group by an acid treatment. The react…
We describe a wide-gap multichannel cylindrical deflection electron energy analyzer suitable for measuring the weak signals characteristic of electronically inelastic electron energy loss spectra. The analyzer has nearly ideal fringing field termination, and its resolution and energy dispersion were characterized as a…
Abstract Nanocomposite latex with nano‐silica of varying particle sizes was prepared via in situ polymerization and investigated by submicron particle size analysis, transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier‐transform infrared spectrometry (FTIR) and Raman spectrometry. It was…
Abstract For Abstract see ChemInform Abstract in Full Text.
A semirigid conjugated polyaniline (PANI) was complexed with a ω-methoxy poly(ethylene oxide) phosphate (PEOPA) through ionic bonding to yield a supramolecular hairy rod polymer comprised of an ionic PANI backbone and nonionic PEO side chains. The strong backbone−side chain repulsion resulted in a microphase-separated…
Off-lattice Monte Carlo simulations in the canonical ensemble are used to study polymer-particle interactions in nanocomposite materials. Specifically, nanoscale interactions between long polymer chains (N=550) and strongly adsorbing colloidal particles of comparable size to the polymer coils are quantified and their…
Abstract In this comparative study, the effect of carbon black (CB) on the UV aging characteristics of poly(ethylene‐co‐vinyl acetate) (EVA) was investigated. EVA, containing 13% vinyl acetate (VA), and poly(ethylene‐co‐vinyl acetate)/carbon black mixture (EVA/CB), containing 13% VA and 1% CB, were aged by means of UV…
We report on a photoemission study of the electronic structure of metallic ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{VO}}_{3}$, with $x=0.4$ and 0.5, using monochromatized He I, He II, and Al $K\ensuremath{\alpha}$ radiations. He II spectra obtained using monochromatic source exhibit large intensity f…
Abstract A series of new o ‐phenylenediamine (OPD)/ o ‐phenetidine (PHT) copolymers with partly phenazine‐like structures has been successfully synthesized at three polymerization temperatures by chemically oxidative polymerization in four different polymerization media. The molecular structures and properties of the…
Semiconducting nanocrystals, or quantum dots (QDs), have emerged as a new tool in physiological imaging, combining high brilliance, photostability, broad excitation but very narrow emission spectra, and surface chemistry compatible with biomolecular conjugation. In this review, we demonstrate the power of QDs in diver…
Nanocrystalline Bi 2 O 3 has been prepared by a ball milling process. The particle size of the ball-milled Bi 2 O 3 powder has been determined by the x-ray powder diffraction method and transmission electron microscopy. The absorption spectra, in the spectral range 300–1300 nm, indicate an increase of the optical band…
The crystal structure of Escherichia coli PdxY, the protein product of the pdxY gene, has been determined to a 2.2-A resolution. PdxY is a member of the ribokinase superfamily of enzymes and has sequence homology with pyridoxal kinases that phosphorylate pyridoxal at the C-5' hydroxyl. The protein is a homodimer with…
Abstract Utilizing anionic waterborne polyurethane (WPU) as a plasticizer, for the first time, we prepared new soy protein isolate (SPI) plastics. The WPU was prepared by using the emulsion‐extending‐chain method, and mixed with soy protein in aqueous dispersion. The mixture was cast, cured, pickled and hot‐pressed to…
We report a conventional ab initio and density functional theory study of the polarizability (alpha(alphabeta)/e(2)a(0) (2)E(h) (-1)) and hyperpolarizability (gamma(alphabetagammadelta)/e(4)a(0) (4)E(h) (-3)) of the sodium dimer. A large [18s14p9d2f1g] basis set is thought to yield near-Hartree-Fock values for both pr…
Polystyrene- block -poly(methyl methacrylate) copolymers containing [4π + 4π] anthracene photodimer at the junction point between the blocks (PS-AA-PMMA) can be cleaved to the parent homopolymer blocks upon heating above 130 °C or by UV irradiation at 280 nm. PS-AA-PMMA was characterized and then used in thin films to…
We present an ab initio molecular orbital theoretical approach to the origin of nonlinear optical (NLO) properties in the $\mathrm{Te}{\mathrm{O}}_{2}$-based materials from the viewpoint of ``electron pairs'' assigned to the individual chemical bond. Localized static dipole moments, linear polarizabilities, and hyperp…