Materials Literature
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Solid-state properties of the stoichiometric complexes formed by sodium poly(α, l -glutamate) and oppositely charged low molecular weight surfactants (alkyltrimethylammonium bromides) were examined by circular dichroism, infrared, and X-ray diffraction techniques. The polypeptide chains in the complexes were shown to…
Core and valence level photoemission and electron energy loss (EELs) spectra of MoO2 and WO2 have been measured. Metal–metal bonding in these distorted rutile dioxides splits the metal 4d or 5d conduction band into two components, with a significantly bigger splitting for WO2 than MoO2. The O 2p bandwidth is also foun…
The kinetics of hydrogen plasma in an afterglow region has been simulated to distinguish remote plasma treatment from conventional (direct) plasma treatment. A simulation shows the possibility that remote hydrogen plasma treatment can enhance interaction reactions with hydrogen radicals relative to those with electron…
A series of homo- and heterotrinuclear complexes containing three face-sharing octahedra has been synthesized by using the pendent arm macrocyclic ligands 1,4,7-tris(3,5-dimethyl-2-hydroxybenzyl)-1,4,7-triazacyclononane, L 0 H 3, and 1,4,7-tris(4- tert -butyl-2-mercaptobenzyl)-1,4,7-triazacyclononane, LH 3: [{L 0 Ni I…
The synthesis, optical spectroscopy, photophysical properties, electrochemistry, and X-ray photoelectron spectroscopy of a series of [5,10,15,20-tetrakis(perfluoroalkyl)porphinato]zinc(II) complexes and their free base analogs are reported. The title compounds were prepared by a condensation methodology that utilizes…
A new polyurethane structure with a hemicyanine dye attached to the polymer side chain was synthesized by the step growth polymerization in a reaction between ( E )- N -butyl-4-[2-[4-[bis(2-hydroxyethyl)amino]phenyl]ethenyl]pyridinium tetraphenylborate and 2,4-toluene diisocyanate. The molecular weight of the final pr…
Hydrothermal treatment of V2O5 with H2NCH2CH2CH2NH2 in H2O yields (H3N(CH2)3NH3)[V4O10], a layered mixed-valence vanadium oxide with protonated diaminopropane dications in the interlamellar space. The oxide layers are constructed from V5+O4 tetrahedra and pairs of edge-sharing V4+O5 square pyramids. This compound exhi…
Electrochemical quartz crystal microbalance (EQCM) data combined with cyclic voltammetry were used to study the ionic exchange process in polypyrrole films prepared in sulfuric acid solution. A quantitative analysis of the results indicates a doping degree of 33% after polymerization and a high polymerization efficien…
The folding kinetics have been determined for hen egg white lysozyme and two mutants in which Trp-62 and Trp-108 have been individually replaced by tyrosine (Tyr-62-lysozyme and Tyr-108-lysozyme, respectively). An earlier study of wild-type lysozyme [Denton, M. E., Rothwarf, D. M., & Scheraga, H. A. (1994) Biochemistr…
Time-resolved infrared difference spectra have been acquired for a series of Re(I) complexes by step-scan Fourier transform infrared spectroscopy, the first application of the step-scan technique to transient inorganic photochemistry. Shifts in ν(CO) following laser flash excitation at 354.7 nm in CH3CN at room temper…
The ring-opening vibrations of the spherosilasesquioxanes of the general formula (HSiO 3/2 ) 2 n, n = 2, 3, 4, etc., are normal modes in which all Si−O stretching and/or O−Si−O bending displacements of the considered ring are in phase. We have investigated the vibrational structure of the experimentally well-known H 8…
Coadsorption of polymers and surfactants is a poorly understood process that occurs in a variety of complex fluid applications. In single-component solutions, the cationic polyelectrolyte polylysine and the cationic surfactant cetyltrimethylammonium bromide (CTAB) both adsorb to negatively charged silica surfaces. Her…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionOrganic Mixed-Valence Systems: Intervalence Transition in Partly Oxidized Aromatic Polyamines. Electrochemical and Optical StudiesJacques Bonvoisin, Jean-Pierre Launay, Mark Van der Auweraer, and Frans Carl De SchryverCite this: J. Phys. Chem. 1996, 100, 45, 18006Pub…
This paper demonstrates that self-assembled monolayers (SAMs) formed by chemisorption of alkanethiols on the surface of obliquely deposited, 10 nm-thick, films of gold are useful in studies of the anchoring of liquid crystals (LCs) on surfaces. Self-assembled monolayers supported on obliquely deposited gold permit uni…
We have studied the ordering behavior of a (diblock copolymer, poly(styrene- d 8 )−poly(2-vinylpyridine) (dPS−PVP), in a confined geometry by neutron reflectivity, transmission electron microscopy, and atomic force microscopy. The diblock copolymer was confined between a silicon substrate (Si) on one side and a glassy…
We investigate the development of mesophase order in compositionally asymmetric (13 wt % styrene) polystyrene−polyisoprene (SI) diblock and SIS triblock copolymers. The equilibrium ordered morphology of these polymers is a body-centered-cubic (bcc) lattice of spherical S microdomains. The ordering kinetics are measure…
We present a theoretical study of polymer−polymer reaction kinetics at an interface separating two immiscible polymer phases. Such reactions are widely employed in reactive blending of incompatible species. When functional groups are weakly reactive, the rate constant k obeys mean field theory: k ∝ h, where h is the i…
Rheo-optical methods are used to examine the combined effect of shear frequency, strain amplitude, and temperature on the direction and kinetics of flow-induced alignment in lamellar block copolymers. The development of shear-induced alignment in a nearly symmetric polystyrene−polyisoprene diblock (ODT ≃ 164 °C) is re…
In this study, we report the use of surface plasmon spectroscopy (SPS) to investigate the self-assembly polymer solution adsorption process in situ . A sealed sample cell made of Teflon was assembled with the substrate initially coated with a positively charged surface using the Langmuir−Blodgett−Kuhn (LBK) deposition…
Two mixed-valence Mn(III)Mn(II) complexes and a homo-valence Mn(II) trinuclear manganese complex of stoichiometry Mn(III)Mn(II)Mn(III)(5-Cl-Hsaladhp)(2)(AcO)(4)(MeOH)(2).4CH(3)OH (1a), Mn(III)Mn(II)Mn(III) (Hsaladhp)(2)(AcO)(2)(5-Cl-Sal)(2)(thf)(2) (3a) and Mn(II)Mn(II)Mn(II) (AcO)(6)(pybim)(2) (1b) where H(3)saladhp…