Materials Literature
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Biodegradable polymers based on star-shaped poly(ethylene oxide) (PEO)−poly( l -lactide) (PLA) and PEO−poly(ε-caprolactone) (PCL) block copolymers were synthesized by a divergent synthetic method. Multiarm PEOs with various numbers of arms with a fixed molecular weight (MW ∼ 10 000) were synthesized by anionic polymer…
In this paper we report the observation of curent induced change of resistance of thin metallic oxide films. The resistance changes at a very low current (current density $J \geq 10^{3}$ A/cm$^{2}$). We find that the time dependence associated with the processes (increase of resistance) show a streched exponential typ…
Novel boron(III) subphthalocyanines (SubPcs) soluble in organic solvents containing a variety of donor and acceptor substituent groups have been synthesized by boron trihalide-induced cyclotrimerization of adequately substituted derivatives of phthalonitrile in 1-chloronaphthalene. The choice of the substituents on th…
Using neutron reflectometry we have resolved to high resolution the internal structure of self-assembled polyelectrolyte multilayer films and have developed a detailed molecular picture of such systems by analyzing the data with a composition-space refinement technique. We show that such surface films consist of strat…
Chemistry of polythiophenes, R. McCullough electronic properties of polythiophenes S. Hotta chemistry of oligothiophenes, P. Beuerle oligothiophene thin films and crystals, D. Fichou transport phenomena in semiconducting oligothiophenes, G. Horowitz theoretical models of oligo- and polythiophenes, J.-L. Bredas nonline…
Abstract This comprehensive and systematic text is the first of its kind to deal with the fundamental physics underlying the remarkable structural and dynamical properties of block copolymers. It provides the polymer scientist and technologist with a firm grounding in the principles underlying the wide applications of…
A variety of trinuclear complexes [M(3)(H(-)(3)L)(2)](3+) [M = Y, La, Eu, Gd, Dy; L = 1,3,5-triamino-1,3,5-trideoxy-cis-inositol (taci) and 1,3,5-trideoxy-1,3,5-tris(dimethylamino)-cis-inositol (tdci)] was prepared as solid materials of the composition M(3)(H(-)(3)L)(2)X(3).pH(2)O.qEtOH (X = Cl, NO(3); 2.5 </= p </= 9…
Dielectric spectroscopy in the frequency range from 10 -2 to 10 6 Hz and in the temperature range from 190 to 430 K is employed to analyze the temperature dependence of the relaxation rates of the α and δ relaxation of liquid-crystalline polymethacrylates having derivatives of ( p -alkoxyphenyl)benzoate as mesogenic u…
The relationship between coverage of hydrophobic groups on modified glass bead surfaces and macroscopic properties such as wettability or dispersion ability has been demonstrated. The glass bead surfaces modified by trimethylsilyl (TMS) groups were obtained by the chemical reaction between trimethylchlorosilane molecu…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Aqueous Solution Characterization of Catalytically Active Block Copolymers Containing ImidazoleMartin R. Simmons and Costas S. PatrickiosView Author Information Department of Chemical Engineering, University of Manchester Institute of Science and Technology (UMIST…
Poly(vinylidene flouride) (PVF 2 ) gels in diethyl adipate (DEA) with fibrillar morphology. The gels are transparent. The Wide-angle X-ray scattering pattern and FT-IR spectra of the gel indicate the presence of solvated α-phase PVF 2 crystallites in the gel. The intensities of the X-ray diffraction peaks of the gel a…
A new method for the surface derivatization of gold colloidal particles is reported. The method is based on the aqueous solubilization of aliphatic thiols by α-cyclodextrin, which effectively binds to the aliphatic chains and carries the hydrophobic thiol molecules to the surface of the gold particles, where they unde…
The backbone 15 N− 1 H 1 J values have been measured for oxidized and reduced cytochrome b 5 at 500 and 800 MHz. Their field dependence, due to increasing partial orientation of the molecule in solution at high magnetic fields, provides structural constraints relative to the orientation of the NH bond vector with resp…
The Kolmogorov-Johnson-Mehl-Avrami (KJMA) theory for the time evolution of the order parameter in systems undergoing first-order phase transformations has been extended by Sekimoto to the level of two-point correlation functions. Here, this extended KJMA theory is applied to a kinetic Ising lattice-gas model, in which…
We present a theoretical prediction of a new mechanism for carrier population inversion in semiconductors under an applied electric field. The mechanism is originated from a coherent capture-emission type inelastic scattering of resonant states. We support our theory with concrete calculations for shallow acceptor res…
We consider a tight-binding Hamiltonian defined on the quasiperiodic Ammann-Beenker tiling. Although the density of states (DOS) is rather spiky, the integrated DOS is quite smooth and can be used to perform spectral unfolding. The effect of unfolding on the integrated level-spacing distribution is investigated for va…
The absorptive and emissive behavior of four highly fluorescent bisalkyl-substituted poly( p- phenyleneethynylenes) (R = hexyl, dodecyl, 2-(ethyl)hexyl, and 3,5,5-trimethylhexyl) was examined. Aggregate and excimer formation was seen in solution and in the solid state by a combination of absorption and fluorescence sp…
Sp3-hybridized semiconductors (including InP, GaAs, CdSe, and Si) are remarkable from the perspective of physical chemistry. A single electron created by HOMO-LUMO promotion moves rapidly in response to an applied
Three generations of ester-terminated dendrimers have been constructed from (1 R,2 S )-2-amino-1-phenyl-1,3-propanediol, 1, as the central core. The chiroptical properties of the dendrimers were measured revealing that the molar rotations [Φ] of the dendrimers decreased with increasing dendrimer generation. Comparison…
19 F NMR measurements on lithium perfluorononanoate [LiPFN] in D 2 O and in solutions of D 2 O with poly(vinylpyrrolidone) [PVP] at different molecular weights have been carried out. A careful study of literature data and COSY maps allowed the full assignment of the 19 F resonances as a function of concentration and c…