Materials Literature
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The effects of molecular structure on the electronic structure and redox properties of a series of 22 systematically designed conjugated polyquinolines and polyanthrazolines are explored by cyclic voltammetry and spectroelectrochemistry on thin films. The measured electrochemical bandgap of the series of conjugated po…
-position have been prepared as modular components for building block applications. These dyes are stable, accessible, and have suitable spectroscopic features for use as porphyrin accessory pigments in light-harvesting arrays.
The modeling of processes involving multiple length scales is an area of pressing concern, especially in problems such as nanoidentation and crack tip dislocation activity. In these cases, there is more than one characteristic dimension with the nanometer scale arising due to the presence of extended defects such as d…
Conjugated conducting polymers constitute a subject of research lying at the interface between solid-state physics and molecular science. Electronic absorption and vibrational spectroscopies of doped conjugated polymers, whose ground states are nondegenerate, are reviewed from a viewpoint of molecular spectroscopy. Ra…
The experimentally observed asymptotic scaling φ ( L / D ) = constant, for the random packing volume fraction ( φ ) of rods with high aspect ratio ( L / D ), is shown to be the consequence of uncorrelated rod−rod contacts, the constant being equal to 〈 c 〉 = 5.4 ± 0.2 contacts per rod. The weak dependence of 〈 c 〉 on…
A series of bis(2-(3,4-ethylenedioxy)thiophene)-based monomers have been synthesized and fully characterized; specifically ( E )-1,2-bis(2-(3,4-ethylenedioxy)thienyl)vinylene (BEDOT-V), 1,4-bis(2-(3,4-ethylenedioxy)thienyl)benzene (BEDOT-B), 4,4‘-bis(2-(3,4-ethylenedioxy)thienyl)biphenyl (BEDOT-BP), 2,5-bis(2-(3,4-eth…
An FTIR and quadrupole mass spectroscopic study of CO adsorption and oxidation with 16 O 2 and 18 O 2 on copper supported on ZnO and TiO 2 is presented. The experimental results indicate that CO is adsorbed on the metallic particles dispersed on both oxides on two kinds of sites, on the normal terrace sites and on sit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Reactions at Well-Defined Oxide SurfacesMark A. BarteauView Author Information Center for Catalytic Science and Technology, Department of Chemical Engineering, University of Delaware, Newark, Delaware 19716 Cite this: Chem. Rev. 1996, 96, 4, 1413–1430Publication Date…
This book documents the proceedings of the Fourth International Symposium on Polymer Surface Modification: Relevance to Adhesion held under the auspices of MST Conferences, LLC in Orlando, FL, June 9-11, 2003. Polymers are used for a variety of purposes in a host of technological applications and even a cursory look a…
Time-resolved fluorescence and absorption techniques have been used to investigate energy and photoinduced electron transfer in a covalently linked free-base porphyrin−fullerene dyad and its zinc analog. In toluene, the porphyrin first excited singlet states decay in about 20 ps by singlet−singlet energy transfer to t…
Interfacial effects play a major role in the formation of organic polymer−smectite clay nanocomposites. As little 2 mol % Na+ cations on the exchange sites of a short-chain alkylammonium smectite clay completely inhibits exfoliation of the silicate nanolayers in an epoxy matrix.
The properties of dendrimers (“starburst” molecules) under varying solvent conditions are studied using molecular dynamics simulations. The dendrimers are found to have a compact (space filling) structure under all solvent conditions, with a radius of gyration which scales with the number of monomers as R G ∝ N 1/3 .…
Many processes have been considered over the years to explain the origin of breakdown in cable insulation. Such effects as space charge build-up, tree growth, charge injection, etc. have all been discussed. Various techniques are now available to measure, in a nondestructive way, space charge distributions in insulato…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTEvidence of a Novel Side Chain Structure in Regioregular Poly(3-alkylthiophenes)T. J. Prosa, M. J. Winokur, and R. D. McCulloughView Author Information Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 Departm…
High chromium white irons are ferrous based alloys containing 11–30 wt-% chromium and 1.8–3.6 wt-% carbon, with molybdenum, manganese, copper, and nickel sometimes added as additional alloying elements. The microstructure of these alloys typically consists of hard primary and/or eutectic carbides in a matrix of austen…
Abstract This paper presents a critical review of the basic data concerning the physics and chemistry of low pressure SiH 4 glow discharges used to deposit hydrogenated amorphous silicon films (a‐Si:H). Starting with an updated table of thermochemical data, we analyze the gas‐phase elementary processes consisting of i…
Differences between the surface chemical properties of hydrogen- and nitrogen-treated samples of an activated carbon were quantified using several complementary techniques. Calorimetric studies conducted at 303 K revealed that the sample treated in N 2 at 1223 K adsorbs a great deal of oxygen with unusually high diffe…
To study the role of oligosaccharides on the properties of glycoproteins, five glycoproteins (yeast external invertase, bovine serum fetuin, glucoamylase from Aspergillus niger, and chicken egg white ovotransferrin and avidin) of previously established glycan patterns were purified to homogeneity and deglycosylated wi…
Modification of the polyol process has enabled the synthesis of nanometre-sized silver particles with a narrow size distribution. Dispersions of colloidal silver have been prepared by the reduction of silver nitrate in ethylene glycol in the presence of a polymeric protective agent, namely polyvinylpyrrolidone (PVP).…
A new class of chromophores has been fabricated that features both electron-releasing and electron-withdrawing groups fused via an intervening ethynyl moiety to the carbon framework of a (porphinato)metal complex. These species possess large molecular first-order hyperpolarizabilities (β). We report herein the synthes…