Materials Literature
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High-quality epitaxial ZnO layers grown on facet-controlled epitaxial lateral overgrown (FACELO) GaN/sapphire templates were achieved by an evaporation−physical transport−condensation method. The ZnO/FACELO GaN heterostructures showed a substantial improvement in the crystalline quality with a lower defect density and…
Abstract Nitrogen-linked aromatic carbazole polymers were prepared by palladium-catalyzed amination reactions. They are classified as a partially annulated poly(m-aniline), and show a bathochromic shift of absorption maxima as well as reversible redox responses in solutions.
A simple procedure has been developed for the preparation of highly fluorinated poly(arylene alkylene ether sulfone)s using a nucleophilic polycondesation reaction of decafluorodiphenyl sulfone (DPSO) with a series of fluorinated linear or branched alkylene diols containing 4−12 carbon atoms. The reactions are activat…
The reducing property of an organically soluble conducting polymer (poly(o-methoxyaniline), POMA) is used to prepare monodisperse, size-controlled, highly populated, and highly stable silver nanoparticles in an organic medium through an interfacial redox process with an aqueous AgNO3 solution. The transition of emeral…
We prepared water dispersions of poly(n-butyl methacrylate-st-butyl acrylate) crosslinked core-shell nanoparticles functionalized with different amounts of trimethoxisilane (TMS) groups in the outer shell. The purpose of the TMS groups is to chemically bind the rubbery particles to a nanostructured silica network, usi…
Lamellar structure of poly(Ala-Gly) or (AG)n in the solid was examined using 13C solid-state NMR and statistical mechanical approaches. Two doubly labeled versions, [1-13C]Gly14[1-13C]Ala15- and [1-13C]Gly18[1-13C]Ala19 of (AG)15 were examined by two-dimensional (2D) 13C spin diffusion NMR in the solid state. In addit…
X-shaped rigid methylthio arylethynes (MTA) have been demonstrated to mediate the assembly of gold nanoparticles. The structural attributes of MTAs include molecular rigidity, π-conjugation, and importantly the tunability in terms of size, shape, and binding strength. The size, kinetics, optical, and spectroscopic pro…
Block copolymers constitute an important class of soft material capable of self-assembling into nanoscale microdomains with well-defined geometries. The cylindrical domains thus formed have been found to pack almost exclusively in hexagonal lattice. In this study, we disclose how the mesomorphic molecular order can me…
The critical adsorption point (CAP) of self-avoiding walks (SAW) interacting with a planar surface with surface disorder or sequence disorder has been studied. We present theoretical equations, based on ones previously developed by Soteros and Whittington [ J. Phys. A.: Math. Gen. 2004, 37, R279−R325], that describe t…
Tb-doped SiO 2 nanowires have been synthesized through a vapor−liquid−solid (VLS) mechanism. The morphology and compositional characteristics of the doped nanowires have been investigated by various microscopy techniques. The prepared nanowires have amorphous characteristics with a diameter distribution range from 15…
The threading behavior of a zinc analogue of a previously reported processive manganese porphyrin catalyst onto a series of polymers of different lengths is reported. It is demonstrated that the speed of the threading process is determined by the opening of the cavity of the toroidal porphyrin host, which can be tuned…
Radiolabeling studies were employed to investigate the influence of structure on the efficiency of surface functionalization for poly(acrylic acid)-coated shell crosslinked nanoparticles (SCKs) with two types of amine-terminated DOTA chelators. An intricate interplay between the chemical and physical properties of bot…
Zn1-xCuxAl2O4 (0 < or = x < 0.30) compounds have been synthesized by polyesterification using metallic salts and annealing at low temperatures as well as by conventional solid state. XRD-powder data refinements (Rietveld method) have demonstrated that both compound series crystallize in the spinel structure (Fd3m) and…
Three novel polyphosphazene-functionalized diaminobutane poly(propyleneimine) dendrimers have been prepared and investigated for their properties as prospective hydrophobic drug delivery systems. The solubilization and release properties of these functionalized dendrimers have been investigated by absorption and fluor…
The structural aspects of a soft chemical route 1 employed to obtain nitrogen-doped brookite, rutile, or anatase fine crystallite powders are revealed by total X-ray diffraction and atomic pair distribution function analysis. It is found that the route first passes through a heavily disordered phase consisting of nano…
We report on the synthesis of telechelic poly( N -isopropylacrylamides) (PNIPAM) via nitroxide-mediated controlled polymerization, putting a focus on the introduction of defined end group moieties into telechelic poly( N -isopropylacrylamide) and poly( n -butyl acrylates). Various functional groups, linked to the cent…
The genome of Pseudomonas putida KT2440 encodes five proteins of the phosphoenolpyruvate-carbohydrate phosphotransferase system. Two of these (FruA and FruB) form a dedicated system for fructose intake, while enzyme I(Ntr) (EI(Ntr); encoded by ptsP), NPr (ptsO), and EII(Ntr) (ptsN) act in concert to control the intrac…
We found that the topology of cleavable polymer from linear to hyperbranched can be tuned simply by varying the polymerization temperature: linear polymers were produced at temperatures ≤ 40 °C, hyperbranched polymers were obtained at elevated temperatures (≥ 48 °C); the degree of branching (DB) of hyperbranched polym…
The temperature dependence of the fluorescence of trace levels of pyrene was employed to measure the glass transition temperatures ( T g s) of polystyrene (PS) domains within ultrathin films of poly(styrene- block -methyl methacrylate) (P(S- b -MMA)) and poly(styrene- block -2-vinylpyridine) (P(S- b -2VP)) diblock cop…
A new diamine containing a pyridine heterocyclic group and a pyrene substituent, 4-(1-pyrene)-2,6-bis(4-aminophenyl)pyridine ( PBAPP ), was synthesized and used in a preparation of poly(pyridine−imide) by direct polycondensation with 4,4‘-hexafluoroisopropylidenediphathalic anhydride (6FDA) in N -methyl-2-pyrrolidinon…