Materials Literature
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Raman spectroscopy was employed as a fast and exact general method to determine the charge on BEDO-TTF (BO) in its complexes in any sample form such as single crystals, powders, and dispersed polymer films. Linear dependencies between the frequencies of two totally symmetric C C stretching modes and the charge on BO w…
Palladium multilayers deposited on Pt(111), Pt(100), and Pt(110) single-crystal electrodes have been characterized by using adsorbed nitric oxide as a probe molecule. Nitric oxide adlayers can be easily formed on the palladium-covered electrodes from nitrous acid or NO-saturated solutions and are stable under electroc…
The pathway and kinetics for the cylinder-to-sphere order−order transition in a mixture of a matched diblock and triblock copolymer of styrene and ethylene−butene-1 is reported. The microstructure transformation was monitored by viscoelastic measurements, and the structural assignments of the intermediate states were…
The adsorption of chicken egg white lysozyme at the functionalized silicon oxide−solution interface has been studied using the combined measurement of spectroscopic ellipsometry and neutron reflection. The solid oxide surface was modified by coating a self-assembled monolayer of pentadecyltrichlorosilane with terminal…
To design new polymers for use in vivo it is necessary to characterize the surface of the material to understand the interactions that occur when it is exposed to biological environments. Incorporation of phosphorylcholine (PC) into polymers has been shown to improve biocompatibility by suppressing unfavorable respons…
In the current work, sandwich composite structures with innovative constructions referred to as Z-pins, or truss core pins, are investigated. The Z-pin core sandwich construction offers enhanced transverse stiffness, high damage resistance, and multi-functional benefits. The present study deals with analysis of low-ve…
The saturation adsorption of octadecyltrichlorosilane (OTS) on two fumed silicas [Aerosil 380 (A380), Aerosil OX50 (OX50)] was investigated as a function of their hydration states. The amount of water adsorbed onto the fumed silica was in the order superhydrated A380 > as is A380 ∼ superhydrated OX50 > as is OX50. The…
Conditions for polymerizing ethylene terephthalate cyclic oligomers (ETCs) with the catalyst antimony trioxide were investigated with the ultimate goal in mind of using ETCs to produce high-performance poly(ethylene terephthalate) (PET) composites. The ETCs used were prepared both by a direct synthesis method and by c…
Tertiary amine dendrimers with both hydrophilic and hydrophobic chains on every end were synthesized from poly(propyleneimine) dendrimers DAB- dendr -(NH 2 ) n ( n = 8, 32, and 64) using sequential amidations and LiAlH 4 reductions. The tertiary amine dendrimers were quaternized completely with methyl iodide and conve…
The effect of reduction temperature on the hydrogen adsorption and Rh dispersion in a Rh/Ce 0.68 Zr 0.32 O 2 catalyst with texturally stable Ce 0.68 Zr 0.32 O 2 support was investigated. Rh dispersion data were also obtained from Rh particle size analyses made using high-resolution transmission electron microscopy (HR…
Various types of epoxide−amine networks based on diglycidyl ether of Bisphenol A (DGEBA), diglycidylaniline (DGA), or TGDDM were prepared, and the effect of the reaction mechanism on network formation, its structure, and properties was investigated. Structure evolution was followed, and fraction of the sol, equilibriu…
Two kinds of transitions involving a change in molecular assembly, lattice disordering/ordering transition (LDOT) and demicellization/micellization transition (DMT), in highly asymmetric polystyrene- block -polyisoprene (SI diblock) copolymers were investigated using oscillatory shear rheometry, transmission electron…
The achiral syn folded conformer (face-to-face) of the ethane-bridged bis(Zn porphyrin) gradually transforms into the chiral extended anti form in the presence of enantiopure guest molecules (alcohols or amines) upon lowering the temperature from 293 to 183 K. The mechanism of the supramolecular chirality induction is…
We have used the dissipative particle dynamics method (DPD) to simulate grafted polymer brushes in a pore geometry using two walls of tethered DPD particles to form the top and bottom boundaries of the simulation cell. The polymer density profiles show a parabolic shape in agreement with the SCF theory for brushes in…
Catalase-peroxidases have a predominant catalatic activity but differ from monofunctional catalases in exhibiting a substantial peroxidatic reaction which has been implicated in the activation of the antitubercular drug isoniazid in Mycobacterium tuberculosis. Hydroperoxidase I of Escherichia coli encoded by katG is a…
Diazo-resins (DAR) as polycation and poly(acrylic acid) (PAA) as polyanion were alternately assembled into a multilayer structure by using the layer-by-layer self-assembly technique. PAA as a weak polyelectrolyte was very sensitive to the pH value of the solution, and that pH could be used to tune the thickness of the…
We present results for physical aging of films made from a high free volume polymer (poly[1-(trimethylsilyl)-1-propyne], PTMSP). Aging was tracked by gas permeation measurements of He and N 2 . The intermediate and thin films (3 and 1 μm) showed a rapid loss of gas permeability with time while the thick film (85 μm) s…
A quasi-one-dimensional (quasi-1D) Au nanocolloids array has been fabricated on silicon by combining the techniques of atomic force microscopy (AFM)-based nanooxidation and chemical assembling of colloidal nanoparticles. The silicon substrate, modified with an octadecyltrichlorosilane (OTS) monolayer, was first subjec…
Single-walled carbon nanotubes were studied by (13)C nuclear magnetic resonance (NMR). Two types of (13)C nuclear spins were identified with different spin-lattice relaxation rates. The fast-relaxing component, assigned to metallic tubes, followed the relaxation behavior expected in metals, and the density-of-states a…
A perturbative study of the Holstein Molecular Crystal Model which accounts for lattice structure and dimensionality effects is presented. Antiadiabatic conditions peculiar of narrow band materials and an intermediate to strong electron-phonon coupling are assumed. The polaron effective mass depends crucially in all d…