Materials Literature
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We have studied the dependence of the electro-optical properties of polymer dispersed liquid crystals (PDLC) on the ultraviolet (UV) cure of the solution of monomer and liquid crystal. The kinetics of UV polymerization and its effect on the morphology of the phase separated droplets of liquid crystal determine the swi…
Multicomponent Ga2O3–In2O3 films have been prepared by dc magnetron sputtering using targets with a Ga content [Ga/(In+Ga) atomic ratio] of 0–60 at. %. Transparent conducting thin films prepared with Ga contents up to about 40 at. % were identified as Ga-doped In2O3 (In2O3:Ga). A minimum resistivity of 5.8×10−4 Ω cm a…
A simple equation suitable for predicting the growth rate of a vapor bubble in uniformlysuperheated pure liquids and in binary solutions with a non-volatile solute was developed. The equation also improves on the popular pure-liquid bubble growth expression of Mikić et al. (International Journal of Heat and Mass Trans…
The readily available permanganate, KMnO 4, was successfully utilized in the synthesis of manganese oxide octahedral molecular sieve (OMS-1) with the todorokite type structure. The magnesium concentration in the starting materials was systematically varied to study the synthetic chemistry of Mg−OMS-1. The techniques s…
The analytic Polymer Reference Interaction Site Model (PRISM) theory of structurally and interaction symmetric Gaussian diblock copolymer fluids is reformulated, extended, and applied to make predictions for experimentally observable equilibrium properties of the disordered state. These include the temperature, degree…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTThe Remarkable Catalytic Activity of Alkali-Metal Alkoxide Clusters in the Ester Interchange ReactionMatthew G. Stanton and Michel R. GagnéView Author Information Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599 Ci…
The structures of fast ion conducting glasses in the system (AgI${)}_{\mathrm{x}}$-(${\mathrm{Ag}}_{2}$O-${2\mathrm{B}}_{2}$${\mathrm{O}}_{3}$${)}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ have been investigated using x-ray- and neutron-diffraction techniques. The contrasting scattering cross sections of the two technique…
Some new results on thermodynamic interactions in blends of model polyolefins are reported, including more examples of the anomalous attraction found earlier for polyisobutylene (PIB) blends. Small-angle neutron scattering (SANS) data demonstrate a significant suppression of concentration fluctuations in two polypropy…
Abstract Living cationic ring‐opening polymerization of ϵ‐caprolactone (CL), δ‐valerolactone (VL) and 1,3‐dioxepane‐2‐one ( 6 ) was achieved at room temperature by using zirconocene borate complex catalysts. Respective block copolymerization of CL with VL or with cyclic carbonate 6 was also successfully performed. The…
Abstract An analytical solution for the distribution of molecular weight, long chain branching and chemical composition of polyolefins produced under steady‐state conditions with the mechanism of terminal branching is derived. The model predictions agree well with Monte‐Carlo simulation results. This detailed descript…
Abstract Na2W4O13 with a layered structure possessed an energy gap between those of bulky WO3 and polyacid [Si(W3O10)4]4− photocatalysts and was active for photocatalytic hydrogen and oxygen evolution reactions in the presence of sacrificial reagents.
Abstract By using geometry optimizations with local density functional theory and double‐π plus polarization basis sets, an extensive study has been carried out on the molecular structures and stabilities of free‐base and metal‐complexed corrole isomers. The optimized structures of normal metallocorroles have been fou…
Structural modifications to photochromic 3H-naphtho[2,1 -b]pyrans and 2H-naphtho[1,2-b]pyrans have produced compounds that have found utility in plastic ophthalmic lens applications. The influence of substituents on color, optical density, and fade rate are reported. Synthetic routes to products and key intermediates…
The structure of vitreous boron trioxide (${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$) has been investigated by reverse Monte Carlo modeling using reported neutron and x-ray diffraction data. Structural models with different amounts of borons in boroxol rings were created using coordination and bonding constraints. The struc…
The adsorption and reaction of NO on a model catalyst composed of Rh supported on ceria has been studied. CeO2 films were grown epitaxially by laser ablation onto SrTiO3(001) substrates. X-ray diffraction and transmission electron microscopy indicate the films are single crystalline with (001) orientation. Comparison…
The diffuse phase transition in ferroelectrics with mesoscopic heterogeneity has been discussed within the context of a superparaelectric model by using the Ginzburg-Landau formalism. In the Curie region ferroelectrics with mesoscopic heterogeneity are treated as 'superparaelectrics' consisting of a mass of polar clus…
Novel biodegradable and biocompatible polyesters have been prepared by random copolymerization of ε-caprolactone (ε-CL) and 1,4,8-trioxaspiro[4.6]-9-undecanone (TOSUO) initiated by Al(O i Pr) 3 . Copolyesters of molecular weight ( M̄ n ) up to 10 4 and containing up to 90 mol % TOSUO repeating units have been prepared…
Dedensification (up to 10% of the theoretical density in some instances) occurs at temperatures of .1320°C during the sintering of commercial undoped BaTiO 3 powders. The expansion of the rigid, interconnected network of large, rounded grains that grow by the Ostwald ripening effect can explain the dedensification tha…
This work was conducted as part of our continuing effort to determine the factors that affect cation formation for organometallic aluminum complexes. In this study, the interactions of R(2)AlX (where R = Me, (i)Bu, (t)Bu; X = Cl, Br, I) with the monodentate bases thf, pyridine, NEt(3), HN(i)Pr(2), H(2)N(i)Bu, H(2)N(t)…
A new series of ferroelectric liquid crystal materials containing a lateral methyl group on the aromatic ring of the alkoxybenzoate unit has been synthesized and investigated. These materials exhibit a wide temperature range of ferroelectric SmC* phase on cooling (including supercooling) with a very high spontaneous p…