Materials Literature
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Hybrid copolymers with dendritic−linear blocks are shown to exhibit many of the classic microphase-separated structures of linear−linear block copolymers. Transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS) were used to evaluate the morphology of a six…
Normal state conductivity and superconductivity together with bulk magnetic susceptibility and magnetization measurements have been measured for two molecular charge-transfer salts: beta' '-(ET)4[(H3O)Ga(C2O4)3]G (ET = bis(ethylenedithio)tetrathiafulvalene, G = pyridine for compound I and nitrobenzene for compound II)…
In situ UV−vis absorption spectroscopy is used to probe the extent of dissociation of a weak polycarboxylic acid incorporated within a polyelectrolyte multilayer. The effective acid dissociation constant is shown to depend on the nature of the multilayer. Salt counterion and proton populations within the multilayer ar…
Three novel 4,7-bis(n-pyridylethynyl)-2,1,3-benzothiadiazoles (n = 2, 3, and 4) were synthesized by using the Sonogashira cross-coupling reaction of 4,7-dibromo-2,1,3-benzothiadiazole with the corresponding ethynylpyridines in the presence of a Pd(II) catalyst. The viologen analogues were also prepared by methylation…
In the present work we report a detailed spectroscopic analysis of diffusive relaxation and vibrational properties of water in bulk and confined in nanopores of Gelsil glass, at different temperatures and different hydration percentages, performed by incoherent quasi-elastic and inelastic neutron scattering, IQENS and…
A "CBABC"-type pentablock coupling polymer, mesylMPEO, was designed and synthesized to promote human endothelial cell growth on the surfaces of polyurethane biomaterials. The polymer was composed of a central 4,4'-methylenediphenyl diisocyanate (MDI) coupling unit and poly(ethylene oxide) (PEO) spacer arms with methan…
The absorption spectra of zinc porphyrin, zinc meso -tetraphenylporphyrin, and their β-halogenated derivatives are calculated and analyzed using time-dependent density functional theory (TDDFT) and time-dependent Hartree−Fock theory based on the intermediate neglect differential overlap/spectroscopic approximation (TD…
Pt(0)-catalyzed ring-opening precipitation copolymerization of [1]silaferrocenophanes fcSiMe(2) (3) and the spirocyclic cross-linker fcSi(CH(2))(3) (4) (fc = Fe(eta(5)-C(5)H(4))(2)) was used to prepare polyferrocenylsilane microspheres (PFSMSs) under mild conditions. By varying the reaction conditions, a wide variety…
Both cubic and hexagonal phases of ZnS are modeled using interatomic potential based simulations and density functional theory. A new set of potential parameters is derived, showing improved behavior compared with the previous ones. Results obtained with this new potential model show very good agreement with those obt…
A novel approach for the potentiometric detection of saccharides using poly(aniline boronic acid) is presented. A model is described in which the electrochemical potential is sensitive to the change in the pK(a) of the conducting polymer as a result of boronic acid-diol complexation. In this system, boronic acid compl…
Polystyrene nanocomposites with functionalized single-walled carbon nanotubes (SWNTs), prepared by the in-situ generation and reaction of organic diazonium compounds, were characterized using melt-state linear dynamic viscoelastic measurements. These were contrasted to the properties of polystyrene composites prepared…
We have investigated the electronic, structural, and dielectric properties of the ferroelectric ${\mathrm{Sn}}_{2}{\mathrm{P}}_{2}{\mathrm{Se}}_{6}$ using the local density approximation of the density functional theory. The charge density analysis reveals the existence of isolated $[{\mathrm{P}}_{2}{\mathrm{Se}}_{6}]…
[reaction: see text] The synthesis and biochemical reactivity of the first photoactivated mitosene-based DNA interstrand cross-linking agent is described.
Hildebrand solubility parameters ( δ ) of a series of linear low-density polyethylenes (LLDPE) were measured at several elevated temperatures by the inverse gas chromatography (IGC) method of DiPaola-Baranyi and Guillet [ Macromolecules 1978, 11, 228−235] with the incorporation of a compressible regular solution model…
Dynamical instabilities are discussed for strongly interacting colloidal suspensions which are driven into nonequilibrium by an external field in the limit where hydrodynamic interactions can be neglected. Brownian dynamics computer simulations indicate that stripe-like patterns of particles driven alike are spontaneo…
7,8-diaminopelargonic acid (DAPA) synthase (EC 2.6.1.62) is a pyridoxal phosphate (PLP)-dependent transaminase that catalyzes the transfer of the alpha-amino group from S-adenosyl-L-methionine (SAM) to 7-keto-8-aminopelargonic acid (KAPA) to form DAPA in the antepenultimate step in the biosynthesis of biotin. The wild…
Peptide nanotubes have been self-assembled from the peptide monomers with polycarbonate membranes in solution to control the diameter of the nanotubes by using the membranes as templates. The diameters of self-assembled peptide nanotubes can be controlled by the pore sizes of the polycarbonate membrane templates, wher…
Periodic submicroscale diamond-cylinder arrays were fabricated on diamond surfaces using two-dimensionally ordered arrays of SiO 2 particles. For the preparation, the diamond surface was etched by means of reactive ion etching with oxygen plasma through two-dimensionally ordered arrays as masks. The etching time has a…
The measurement of an acoustic emission, or scatter, from a bubble is not difficult. However, an accurate interpretation of that signal in terms of the bubble dynamics may require careful consideration. The study presented here is at first sight relatively simple: comparison of the predicted and measured quality facto…
A modified embedded atom model of gallium has been developed. This simple atomic level model is able to reproduce the unusual behavior of this complex element. The calculated energetics and volumes of many allotropic phases of gallium are found to be in close agreement with first principles calculations and experiment…