Materials Literature
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In a typical thermoelectric device, a junction is formed from two different conducting materials, one containing positive charge carriers (holes) and the other negative charge carriers (electrons). When an electric current is passed in the appropriate direction through the junction, both types of charge carriers move…
Various nanoscale semiconducting superlattices have been generated by direct templating in a lyotropic organic liquid crystal. These include superlattices of CdS, CdSe, and ZnS, templated in a liquid crystal formed by oligoethylene oxide oleyl ether amphiphiles and water. The semiconductor growth process copied the sy…
We present the analytic solution of the Mode III steady-state crack in a square lattice with piecewise linear springs and Kelvin viscosity. We show how the results simplify in the limit of large width. We relate our results to a model where the continuum limit is taken only along the crack direction. We present result…
To investigate surface free energy of rubbed polyimide surfaces as a function of the rubbing strength, we measured the contact angle of distilled water and methylene iodide on the polyimide surfaces. For this purpose, a main-chain-type and two side-chain-type polyimides were used. The dispersion force (γd) and the pol…
Prevulcanization of natural rubber latex was investigated as a function of maturation duration. The morphology of the film formed from these latexes was monitored using atomic force microscopy (AFM) as the film aged. The morphology is correlated with the cross-link density of the rubber molecules. Film formed from pre…
The lamellar structures in nylon 6,6 were characterized at several temperatures using synchrotron small-angle X-ray scattering (SAXS) to monitor the changes during the Brill transition at ∼160 °C ( T B ). The integrated intensity and the coherence length of the lamellar stacks increase during heating above T B . In co…
Dynamical experimental studies of the diffraction efficiency, birefringence, and surface relief modulation were carried out on functionalized azopolymer films of p(DR1M-co-MMA) with a 12% mole fraction of DR1M. The gratings were recorded using two linearly polarized pump beams (λ = 514.5 nm) either with a parallel con…
The effects of doping Co for the Ga site on the oxide ion conductivity of La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3 have been investigated in detail. It was found that doping Co is effective for enhancing the oxide ion conductivity. In particular, a significant increase in conductivity in the low-temperature range was observed.…
Accurate orthogonal tight-binding Hamiltonians are constructed for ferromagnetic SrRuO$_3$ and the layered perovskite superconductor, Sr$_2$RuO$_4$ by fitting to all-electron full-potential local density band structures obtained by the linearized augmented planewave method. These Hamiltonians allow the band structure…
In this work we first study the quantum diffusion in a volume of a crystalline solid at high interstitial concentrations when the effects of the short-range interactions between the diffusing particles are to be factors. Within the scope of the small-polaron formalism the transition rate depending on both the temperat…
Superparamagnetism is a unique feature of magnetic nanoparticles. Spinel ferrite nanoparticles provide great opportunities for studying the mechanism of superparamagnetic properties. CoFe 2 O 4 nanocrystallites have been synthesized with a microemulsion method. The neutron diffraction studies and the temperature-depen…
Light scattering has been used to investigate the effect of shear-induced demixing (SID) in polystyrene/poly(vinyl methyl ether) blends of diverse molecular weight distributions down to −30 K below the quiescent spinodal temperature of any blend. The early stage of the demixing process, observed along the vorticity di…
Thermally reversible organogels, comprised of a variety of organic liquids and low concentrations of relatively low molecular mass aza analogues of previously investigated ALS (i.e., aromatic linker steroid) molecules have been investigated. The aza-ALS gelators are derivatives of 3β-cholesteryl 4-(2-anthrylamino)buta…
The aim of this study is to determine the effects of plasticizer hydrogen bonding capability and chain length on the molecular structure of sodium caseinate (NaCAS), in NaCAS/glycerol and NaCAS/polyethylene glycol 400 (PEG) systems. Both solution and film phases were investigated. Glycerol and PEG reduced the viscosit…
The room-temperature reactions of excess Ti(O i Pr) 4 with the hydroxyl groups of a nonporous silica yield dinuclear surface complexes regardless of the degree of partial dehydroxylation of the silica. The surface reactions were studied by in situ IR transmission spectroscopy, 13 C CP/MAS NMR, GC/MS, and elemental ana…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Assembly of Aβ(10-35)-PEG Block Copolymer FibrilsTimothy S. Burkoth, Tammie L. S. Benzinger, Volker Urban, David G. Lynn, Stephen C. Meredith, and P. ThiyagarajanView Author Information Departments of Chemistry and Pathology The University of Chicago, Chicago, Ill…
Electron momentum density and Compton profiles in Lithium along $<100 >$, $<110>$, and $<111>$ directions are calculated using Full-Potential Linear Augmented Plane Wave basis within generalized gradient approximation. The profiles have been corrected for correlations with Lam-Platzman formulation using self-consisten…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPreparation of Structurally Well-Defined Polymer−Nanoparticle Hybrids with Controlled/Living Radical PolymerizationsTimothy von Werne and Timothy E. PattenView Author Information Department of Chemistry University of California at Davis One Shields Avenue, Davis, Calif…
Sapphire is an ideal visible-MWIR window due to its excellent optical and mechanical properties and its availability in large sizes up to 340-mm diameter boules. Anticipated applications for new, high performance optical systems call for even larger, 450-750 mm diameter, windows. The present effort has focused on prod…
We substituted neutral amino acids for some positively charged residues (R42, K107, K146, R148 and K229) that line the active site of aldolase A in an effort to determine binding sites for inositol 1, 4,5-trisphosphate. In addition, D33 (involved in carbon-carbon bond cleavage) was mutated. K229A and D33S aldolases sh…