Materials Literature
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Robust multilayer patterns have been created via layer-by-layer self-assembly using a photochemical linking process that involves aromatic azo group cleavage and coupling with carbonyl oxygens from an adjacent polymer strand. The patterning is based on the solubility difference of the photoreactive multilayer before a…
Aldehyde dehydrogenases are isolated as dimers or tetramers but have essentially identical structures. The homotetramer (ALDH1 or ALDH2) is a dimer of dimers (A-B + C-D). In the tetrameric enzyme, Ser500 from subunit "D" interacts with Arg84, a conserved residue, from subunit "A". In the dimeric ALDH3 form, the intera…
A practical and efficient epoxidation of aromatic olefins using Oxone in a two-phase system (ethyl acetate−water) is described. The reported method is suitable for large-scale synthesis and does not require phase transfer catalyst (PTC) or pH control.
Nanosized TiO2 particles are incorporated into pore channels of mesoporous silica thin films (MSTFs) by a simple constituent-template displacement process, consisting of depositing MSTF on quartz slides, treatment with Ti(OBu)4, and heating. Ti is present in two coordination states, an anatase-like nanosized TiO2 phas…
The adsorption of proteins on surfaces with grafted polymers is studied using a molecular mean-field theory. The effects of changing the protein−surface interactions, the polymer−surface interactions, the polymer segment volume, and the type of possible protein conformations adsorbed are studied. The main results of t…
Phosphoglucomutases catalyze the interconversion of D-glucose 1-phosphate and D-glucose 6-phosphate, a reaction central to energy metabolism in all cells and to the synthesis of cell wall polysaccharides in bacterial cells. Two classes of phosphoglucomutases (alpha-PGM and beta-PGM) are distinguished on the basis of t…
A cation exchange membrane formed via the polymerization of a cobaltabisdicarbollide unit with pyrrole is presented. The cobalt doping agent is covalently bound directly to the pyrrole unit (see Figure); no supporting electrolyte is necessary. An improved overoxidation resistance over the non-covalently linked counter…
Multiaddressable organogelators are 3,3-diphenyl-3 H -naphtho[2,1-b]pyrans covalently linked to sodium N -acyl-11-aminoundecanoate. These molecules have been designed to respond to changes to their environment. They are shown to act as efficient gelators for polar organic fluids, and obviously they exhibit a thermosen…
Luminescence intensity autocorrelation (LIA) is employed to investigate coupling dynamics between (In,Ga)As QDs and a high-Q (~7000) resonator with ultrafast time resolution (150 fs), below and above the lasing threshold at T = 5 K. For QDs resonant and non-resonant with the cavity we observe both a six-fold enhanceme…
The use of microbes as producers of semiconductor nanocrystals is demonstrated. When torulopsis yeast is challenged with lead, it builds intracellular spherical crystallites of PbS, 2–5 nm in diameter (see Figure for an HR-TEM image) and pure by X-ray diffraction. The crystals, which can be isolated by freeze-thawing,…
A simple organic amine-assisted hydrothermal process has been proposed to simultaneously realize the synthesis and assembly of copper sulfide nanoparticles at low temperature (90 ∼ 110 °C). Nanowire-like aggregates (average diameter of 120 nm and length of 2 μm) assembled by digenite phase copper sulfide nanoparticles…
Progress reports are a new type of article in Advanced Materials, dealing with the hottest current topics, and providing readers with a critically selected overview of important progress in these fields. It is not intended that the articles be comprehensive, but rather insightful, selective, critical, opinionated, and…
A compressible random-phase approximation (cRPA) study is performed for a molten UCOT diblock copolymer of incompatible pairs to suggest an effective Flory-type interaction parameter χ cRPA through mean-field spinodals. The compressible nature of a given copolymer system is carried by χ cRPA, which is further divided…
The enantiomeric excesses obtained during the epoxidation reactions of p-chlorostyrene or 1,2-dihydronaphthalene catalysed by two different series of chiral porphyrins are reported. An attempt is made to correlate the enantioselectivity with the steric hindrance generated by the straps of these catalysts. It is shown…
The behavior of chiral-nematic and isotropic phases of helical kappa-carrageenan in aqueous solution of sodium iodide was compared with that of the anisotropic biphasic phase that contains both these phases. On the basis of birefringence, rheology, chemical analysis, average molecular weight, and polydispersity index…
A main-chain nonracemic chiral liquid crystalline polymer was synthesized from ( R )-(−)-4‘-{ω-[2-( p -hydroxy- o -nitrophenyloxy)-1-propyloxy]-1-decyloxy}-4-biphenylcarboxylic acid. This polymer contained 10 methylene units in each chemical repeating unit and was abbreviated PET( R *-10). On the basis of differential…
Protonated forms of layered perovskites were derived from Aurivillius phases, Bi 2 ANaNb 3 O 12 (A = Sr or Ca), by the substitution of bismuth oxide sheets with protons via acid treatment. The conversion into the protonated forms was achieved easily using 6 M HCl at room temperature. Preservation of the structure of t…
The effect of γ-radiation on a perfluoroalkoxy (PFA) resin was examined using solid-state high-speed magic angle spinning (MAS) 19 F NMR spectroscopy. Samples were prepared for analysis by subjecting them to γ-radiation in the dose range 0.5−3 MGy at either 303, 473, or 573 K. New structures identified include new sat…
An investigation of side chain microphase separation within a single comb copolymer molecule containing chemically different A and B side chains has been carried out. Expressions for the transition point in a good ( ∼ N -3/8 ), marginal ( ∼ N -1/2 ), θ ( ∼ N -2/3 ), and poor ( ∼ N -1 ) solvent are derived both by a me…
Abstract A novel preparation approach for high‐performance polyimide gels that are swollen or have a jungle‐gym‐type structure is proposed. A new rigid and symmetric trifunctional amine, 1,3,5‐tris(4‐aminophenyl)benzene (TAPB), was synthesized as a crosslinker. Three different kinds of amic acid oligomers derived from…