Materials Literature
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Differential scanning calorimetry has been used to study the α -relaxation (glass transition) as well as β -relaxation (sub- T g relaxation) in both virgin polystyrene (PS) and PS−clay nanocomposite. The β -relaxations have been measured as a small endothermic peak that appears on heating of the samples previously ann…
We observe a dramatic enhancement of the fluorescence intensity from single core∕shell CdSe∕ZnS nanocrystals upon sudden exposure to air from an evacuated surrounding. Both the number of particles contributing to emission increases as well as the average emission intensity from a single particle, leading to an overall…
Mathematical model that allows for direct tracking of the homoepitaxial crystal growth out of the window etched in the solid, pre-deposited layer on the substrate is described. The growth is governed by the normal (to the crystal-vapor interface) flux from the vapor phase and by the interface diffusion. The model acco…
In this work we present a reliable technique for the production of large areas of high aspect-ratio patterns and describe their use as model super-hydrophobic systems. The high thickness and straight sidewalls possible with SU-8 were used to generate dense patterns of small pillars. These photoresist patterns could be…
We study Ni80Fe20-based permalloys with the relativistic spin-polarized Korringa-Kohn-Rostoker electronic structure method. Treating the compositional disorder with the coherent potential approximation, we investigate how the magnetocrystalline anisotropy, K, and magnetostriction, lambda, of Ni-rich Ni-Fe alloys vary…
We study numerically some discrete growth models belonging to the class of the nonlinear molecular beam epitaxy equation, or Villain-Lai-Das Sarma (VLDS) equation. The conserved restricted solid-on-solid model (CRSOS) with maximum heights differences H_m=1 and H_m=2 was analyzed in substrate dimensions d=1 and d=2. Th…
We use numerical simulation to investigate and analyze the way that rigid disks and spheres arrange themselves when compressed next to incommensurate substrates. For disks, a movable set is pressed into a jammed state against an ordered fixed line of larger disks, where the diameter ratio of movable to fixed disks is…
The synthesis of composite particles with original morphologies resulting from the combination of an inorganic silica seed and polymer nodules is reported. To promote association between both components, the silica seeds are previously functionalized with an appropriate coupling agent carrying polymerizable groups. Fo…
Ti K-edge x-ray absorption near-edge spectroscopy was used to explore the Ti valence and coordination in Ti-activated sodium alanate. An empirical relationship was established between the Ti valence and the Ti K-edge onset based on a set of standards. This relationship was used to estimate oxidation states of the tita…
We have studied the photoinduced transformation of small rings (3-membered) in amorphous silica by Car-Parrinello simulations. The process of ring opening leading to the formation of a couple of paramagnetic centers, namely an E' and a non-bridging-oxygen hole center (NBOHC), has been proposed experimentally to occur…
Based on a recent exchange--correlation kernel developed within Time--Dependent--Density--Functional Theory we derive a practical and general expression for the three--point vertex function. We show that excitonic effects in LiF strongly modifies the low--energy electron linewidths leading to linear scaling with quasi…
A combined experimental and theoretical investigation of the role of proton delivery in determining O2 reduction pathways catalyzed by cofacial bisporphyrins is presented. A homologous family of dicobalt(II) Pacman porphyrins anchored by xanthene [Co2(DPX) (1) and Co2(DPXM) (3)] and dibenzofuran [Co2(DPD) (2) and Co2(…
Red glow in daylight …︁ chemist's delight! An efficient transfer of excitation energy from the ligand to the luminescent states of the coordinated EuIII ion in 1 occurs from the singlet excited state of the ligand. The complex shows characteristic bright red Eu-centered emission with a quantum yield of 0.52 when sensi…
We report the synthesis of colloidal Mn(2+)-doped ZnO (Mn(2+):ZnO) quantum dots and the preparation of room-temperature ferromagnetic nanocrystalline thin films. Mn(2+):ZnO nanocrystals were prepared by a hydrolysis and condensation reaction in DMSO under atmospheric conditions. Synthesis was monitored by electronic a…
Composite materials composed of polymers blended with reinforcing fillers play a major role in various technologies. An important example, commercial rubber, incorporates carbon black fillers, which significantly enhance mechanical properties such as Young's modulus and ultimate strength. The carbon black fillers cons…
Two innovative anthracene bisimides were synthesized and their chemosensory behavior was evaluated. Under neutral or basic conditions, the luminescence of ABI−NH2 was nearly completely quenched via efficient intramolecular photoinduced electron transfer (PET). When exposed to acid or acid halides, the luminescence was…
Broadband dielectric spectroscopy (10 -2 −10 9 Hz) and temperature-modulated differential scanning calorimetry have been performed to study the molecular dynamics of monomer, dimer, and trimer of propylene glycol mono methyl ether (PGME) confined in a two-dimensional layer-structured Na-vermiculite clay. A slight spee…
Amphiphilic diblock copolymers with various block compositions were synthesized with monomethoxy-terminated poly(ethylene glycol) (MePEG) as the hydrophilic block and poly(5-benzyloxy-trimethylene carbonate) (PBTMC) as the hydrophobic block. When the copolymerization was conducted using MePEG as a macroinitiator and s…
Catalytic wet oxidation of phenol solutions at low temperatures of 80−130 °C and space velocities of 1−100 h -1 using Mn−Ce catalysts was studied with an emphasis on the reactive adsorption mechanism and total organic carbon (TOC) removal. Eight catalysts (Mn/Ce = 6:4) were activated under different conditions and pro…
In this work, the omega-amine alkanethiols, cysteamine (CA) and 11-amino-1-undecanethiol (11-AUT), were chemisorbed as self-assembled monolayers (SAMs) onto 250-microm gold microelectrodes that were microlithographically fabricated within eight-well cell culture plates and investigated as a means to improve neuron-to-…