Materials Literature
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We experimentally establish a phase diagram of thin films of concentrated solutions of a cylinder forming polystyrene-block-polybutadiene-block-polystyrene triblock copolymer in chloroform. During annealing the film forms islands and holes with energetically favored values of film thickness. The thin film structure de…
The properties of reduced rutile TiO2(110) surfaces, as well as the adsorption, diffusion, and dissociation of molecular oxygen are investigated by means of density functional theory. The O2 molecule is found to bind strongly to bridging oxygen vacancies, attaining a molecular state with an expanded O-O bond of 1.44 A…
Because of their high aspect ratio, nanosize in diam-eter, very low density, and, more importantly, excellent physical properties (such as extremely high mechanical strength, high electrical and thermal conductivity),1 carbon nanotubes (CNTs) have been considered as ideal reinforcing fillers in polymer nanocomposites…
The in situ ATRP (atom transfer radical polymerization) "grafting from" approach was successfully applied to graft poly(methyl methacrylate) (PMMA) onto the convex surfaces of multiwalled carbon nanotubes (MWNT). The thickness of the coated polymer layers can be conveniently controlled by the feed ratio of MMA to prel…
Dynamic properties, derived from dielectric relaxation spectra of glass-formers at variable temperature and pressure, are used to characterize and classify any resolved or unresolved secondary relaxation based on their different behaviors. The dynamic properties of the secondary relaxation used include: (1) the pressu…
Steam reforming of methane taking place in a Catalytic Plate Reactor (CPR) having as heat source catalytic methane combustion is studied. The CPR thermal behaviour is maintained in an operating range that provides maximum conversions and at the same time is not detrimental to the catalyst. A non-uniform catalyst distr…
Various types of tunable lasing in dye-doped liquid crystals with one dimensional periodic structure have been demonstrated. An electrical tuning of lasing wavelength has been demonstrated in a dye-doped chiral smectic liquid crystal mixture with a short pitch helical structure which is so-called ferroelectric liquid…
In a one-dimensional liquid crystal optical phased array (LCOPA), a liquid crystal layer is electrically addressed by an array of long, narrow electrodes. A spatially periodic voltage profile can be applied to the liquid crystals in order to induce a sawtooth-shaped index of refraction variation in the liquid crystal…
Self-assembled thin films containing an inner monolayer of N,N′-bis(2-phosphonoethyl)-1,4,5,8-naphthalenetetracarboxylic diimide (PNDI) and an outer monolayer of the cationic protein cytochrome c (cyt c) were prepared on the surface of non-porous silica gel particles. Silica particles modified with PNDI alone or with…
Two new lanthanum antimony oxides, LaSb3O9 and LaSb5O12, have been synthesized as bulk phase powders and single crystals by solid state reactions using La2O3 (or La(NO3)3·xH2O), Sb2O3 and Sb2O5 as reagents. The structures of LaSb3O9 and LaSb5O12 were determined by single crystal X-ray diffraction. LaSb3O9 contains exc…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Eric S. G. Shaqfeh, Gareth H. McKinley, Nathanael Woo, D. A. Nguyen, Tam Sridhar; On the polymer…
In the last decade, the progress of protein crystallography allowed several protein structures to be solved at a resolution higher than 0.9 A. Such studies provide researchers with important new information reflecting very fine structural details. The signal from these details is very weak with respect to that corresp…
The reaction between Mn(6)L(12) and Mg(6)L(12) (L = N,N-diethylcarbamate) results in isolation of heteronuclear complexes Mn(n)Mg(6)(-)(n)L(12). A series was prepared with different doping factors n by varying the Mn/Mg ratio in the crystallization solutions. Single-crystal X-ray diffraction shows that MnMg(5)L(12) is…
Layered birnessite-type manganese oxide inserts alkylamines (decylamine–octadecylamine) by ion-exchange and intercalation mechanisms and the concomitant expansion is compatible with formation of a head-to-tail layer of interdigitated amine. The structural arrangement of the MnO2–alkylamine mesophases is sensitive to t…
The common classification of twinning into the four categories of twinning by merohedry (complete and exact overlap of the lattices of the twinned crystals), pseudomerohedry (complete but approximate overlap), reticular merohedry (partial but exact overlap) and reticular pseudomerohedry (partial and approximate overla…
In this paper we describe the facile synthesis of gold nanocrystals of variable morphology using aqueous foam as a template. The aqueous foams are formed by bubbling an aqueous solution of AuCl−4 ions electrostatically complexed with the surfactant cetyltrimethylammonium bromide (CTAB). The gold ions in the stable foa…
The stability of alumina-pillared montmorillonite clays, prepared at various Al/clay ratios, was investigated by compaction at various pressures. The physical properties of the pillared clays, before and after compaction, were studied by powder XRD and nitrogen sorption. We found that the Al/clay ratio used to prepare…
For poly(ethylene oxide) (PEO) melts containing lithium perchlorate (LiClO 4 ), angular frequency ω dependence of the dynamic dielectric properties under steady shear flow was measured using a rheodielectric instrument. The instrument also enabled measurements of the dielectric properties in the quiescent state as wel…
Comb polymers were produced in a two-step synthesis from a bacterial poly[3-hydroxyalkanoate- co -3-hydroxyalkenoate] (PHOU, 1 ) containing 25 mol % terminal side-chain double bonds. The radical addition reaction of 11-mercaptoundecanoic acid to the side-chain alkenes of 1 produced derivative 2 containing thioether bo…
Smectic montmorillonite clay was modified via cation exchange with ammonium salts of poly(oxypropylene)−polyamines (400, 3000, and 5000 M w ). Unusually wide silicate basal spacing (up to 80 Å) and high organic contents (up to 75 wt %) were observed when a 5000 M w amine was used as the intercalating agent. Moreover,…