Materials Literature
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High-cell-density fed-batch cultures of Pseudomonas putida were carried out for the production of medium-chain-length polyhydroxyalkanoates (PHAs) using oleic acid as a carbon source. By employing an optimal feeding strategy without the limitation of any nutrient, a high cell concentration of 173 g/L was achieved, but…
We have measured normal quasi-equilibrium forces between adsorbed layers formed on hydrophilic surfaces in aqueous solutions of telechelic poly(ethylene oxide) end-terminated with octadecyl groups. At low polymer concentrations, c pol, a monolayer adsorbs, which has properties similar to the monolayer of adsorbed nonh…
Mono- (3a,b) and binuclear (4a,b) tetradentate NiII complexes of a series of 26-membered macrocyclic salen dimers, [salen(CH2)]2, are prepared in good yield by solvent-controlled reaction with Ni(OAc)2. The mononuclear complex 3b crystallizes in the trigonal space group 3P1(#144), a = 18.2566(2) A, c = 15.9244(2) A, V…
New cyclic metalloporphyrin hosts, 6 and 7, have been prepared. At 0.33 mM in dichloromethane at 25 °C, they accelerate 65-fold and 840-fold respectively the reaction of diene 1 and dienophile 2 and also bind the hetero Diels−Alder product 3 very strongly. More importantly, small single crystals of solvated 6, 7, and…
The new heteronuclear iminodiacetic acid (H2L) complexes [LnCu6(mu 3-OH)3(HL)2(L)4](ClO4)(2).25H2O with Ln = La (1) and Tb (2) have been prepared in aqueous solution and characterized by single-crystal X-ray diffraction to be isomorphous (crystallographic data for 1 and 2: hexagonal, P63/m; a = b = 12.6425(14) A, c =…
Emulsion polymerization was used to prepare methylsilsesquioxane derivatives with an average particle size of 0.2−5.0 μm and various topological morphologies. Particles with an average particle size of 0.2−2.0 μm were prepared by emulsion polymerization using close to the critical micelle concentration of a nonionic e…
The structure of Ln 0.5 Sr 0.5 CoO 3 is rhombohedral ( R 3̄ c ) when Ln = La, Pr, or Nd, but orthorhombic ( Pnma ) when Ln = Gd. The Ln 0.5 Ba 0.5 CoO 3 compounds, except for Ln = La, are orthorhombic ( Pmmm ). The ferromagnetic Curie temperature, T C, of Ln 0.5 A 0.5 CoO 3 increases with the average size of the A-sit…
A novel liquid crystalline polyacrylate, exhibiting a nematic columnar and a nematic discotic phase, the latter not found in any polymer previously, has been synthesized using a polymer analogous reaction, substituting the discotic mesogens on a reactive polymer. The highly flexible concept of the polymer analogous re…
The reactions of alcohols and alkenes with hydrogen-terminated silicon surfaces have been investigated using infrared spectroscopy and deuterium labeling of the reagents and the surface termination. Transmission FTIR spectra were obtained on samples of electrochemically grown porous silicon or mechanically abraded sil…
X-ray scattering measurements on water confined in the cylindrical pores of MCM-41 with different pore sizes C10 (diameter = 21 Å) and C14 (28 Å) have been performed over a temperature range of 223−298 K. Both samples were sealed in glass capillaries at relative water vapor pressures p / p 0 = 0.3 and 0.6 under monola…
Carbonyl ruthenium(II) 5,10,15-tris(4-R-phenyl)-20-(4-hydroxyphenyl)porphyrins (R = Cl, Me) covalently attached to Merrifield's peptide resin were prepared. The catalyst with R = Cl was found to efficiently catalyze Cl 2 pyNO epoxidation of a wide variety of alkenes, including aromatic and aliphatic terminal alkenes,…
An FTIR study of CO adsorption and oxidation on Au/TiO 2 is reported. At 90 K different CO− 18 O 2 interactions have been performed, with preadsorbed carbon monoxide or preadsorbed isotopically labeled oxygen, with dry or wet carbon monoxide. From the experimental results it can be inferred that (i) at 90 K carbon mon…
trans-(1R,2R)-1,2-Cyclohexanedi(11-aminocarbonylundecylpyridinium) hexafluorophosphate (1) was synthesized. The sol−gel polymerization of Ti[OCH(CH3)2]4 using compound 1 as a self-assembled template afforded fibrous TiO2 materials with a “macaroni”-like structure. The unique structure of TiO2 could be created by the f…
High-cell-density fed-batch cultures of Pseudomonas putida were carried out for the production of medium-chain-length polyhydroxyalkanoates (PHAs) using oleic acid as a carbon source. By employing an optimal feeding strategy without the limitation of any nutrient, a high cell concentration of 173 g/L was achieved, but…
A variety of linear and cross-linked polysiloxanes are transformed into silicon oxide (SiO x ) through the application of a recently developed room-temperature UV/ozone conversion process. Ozone and atomic oxygen, produced by exposure of atmospheric oxygen to ultraviolet radiation, remove organic portions of the polym…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDetection of Fluorophosphonate Chemical Warfare Agents by Catalytic Hydrolysis with a Porous Silicon InterferometerHonglae Sohn, Sonia Létant, Michael J. Sailor, and William C. TroglerView Author Information Department of Chemistry and Biochemistry University of Califo…
We report an evaporation-induced self-assembly procedure to prepare poly(bridged silsesquioxane) thin-film and particulate mesophases that incorporate organic moieties ( 1−3 ) into periodic, mesostructured frameworks as molecularly dispersed bridging ligands. Capacitance−voltage measurements along with a variety of st…
The title reactions of ground-state lead atoms have been studied in isolation in an HTFFR (high-temperature fast-flow reactor) at pressures in the 10−150 mbar range. Pb consumption rate coefficients were determined using atomic resonance absorption spectrometry at 217.0 and 283.3 nm. The following results, in cm 3 mol…
Thermoreversible gelation of rodlike poly(γ-stearyl-α- l -glutamate) in n -dodecane has been studied by differential scanning calorimetry, polarized light microscopy, visual observations, and temperature ramped fluorescence photobleaching recovery. Solutions spanning a wide range of concentrations can produce gels. In…
The film structure, composition, and deposition kinetics of model Ziegler−Natta polymerization catalysts produced by chemical vapor deposition have been studied using temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and X-ray photoelectron spectroscopy (XPS). Redox reactions of metallic Mg a…