Materials Literature
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Non-equilibrium molecular dynamics (NEMD) simulations play a major role in characterizing the rheological properties of fluids undergoing shear flow. However, all previous studies of flows in molecular fluids either use an ‘atomic’ thermostat which makes incorrect assumptions concerning the streaming velocity of atoms…
The structure of L-ribulose-5-phosphate 4-epimerase from E. coli has been solved to 2.4 A resolution using X-ray diffraction data. The structure is homo-tetrameric and displays C(4) symmetry. Each subunit has a single domain comprised of a central beta-sheet flanked on either side by layers of alpha-helices. The activ…
Two-dimensional binary diffraction gratings can be used in wearable display applications as exit-pupil expanders (EPEs) (or numerical-aperture expanders) to increase the size of the display exit pupil. In retinal scanning displays the EPE is placed at an intermediate image plane between the scanners and the display ex…
A simple chemical method to assemble peptide nanotubes and simultaneously arrange them into macroscopic bundles is reported. The peptide nanotubes, self-assemblies of the bolaamphiphilic peptide monomer bis( N -α-amido-glycylglycine)-1,7-heptane dicarboxylate, appeared in acidic solution within 1 week. In the presence…
The objective of this research was to prepare colorless photosensitive polyimides for optical applications. In the first approach to these materials two new photosensitive end-capping agents, i.e., 6-(4-aminophenoxy)hexyl methacrylate and di[2-(methacryloyloxyethyl)] 5-aminoisophthalate, for polyimides were prepared.…
A facile concept to prepare nano-objects based on self-organizing polymeric supramolecules (also called supramolecular block copolymers) is demonstrated using one particular shape, i.e., nanorods or nanofibers. Cylindrical aggregates consisting of a polystyrene (PS) core and a thin corona of poly(4-vinylpyridine) (P4V…
Sorption mechanisms of 1,3- and 1,4-dinitrobenzene, 1,3,5-trinitrobenzene (TNB), dinitro-o-creasol, and 6-sec-butyl-2,4-dinitrophenol (DINOSEB) on smectite were investigated using FTIR spectroscopy and HPLC methods. A quantitative method was developed that established a direct link between the HPLC and the FTIR data.…
Synthesis of mixed monolayer-protected Au clusters (MPCs) from unsymmetrical disulfides (HO(CH 2 ) 11 SS(CH 2 ) 11 CH 3 ) yields clusters with a 1:1 composition of HO(CH 2 ) 11 S− and CH 3 (CH 2 ) 11 S− thiolates, whereas products from reaction of a 1:1 mixture of thiols (HO(CH 2 ) 11 SH and CH 3 (CH 2 ) 11 SH) contai…
Reactions of the LCr(III) unit with an in situ prepared M(PyA)(3)(n-) ion, where L represents 1,4,7-trimethyl-1,4,7-triazacyclononane and PyA(-) is the monoanion of pyridine-2-aldoxime, yield heterodinuclear complexes of general formula [LCr(III)(PyA)(3)M](2+/3+) as perchlorate salts, where M = Cr(II) (1), Mn(II) (2),…
Dielectric relaxation measurements on water mixtures of propylene glycol across the entire concentration range were carried out using time domain reflectometry at 25°C over the frequency range from 10 MHz to 4 GHz. For all the mixtures, only one dielectric loss peak was observed in this frequency range. The relaxation…
The order−disorder transition in a melt of asymmetric micelle-forming diblock copolymers is studied analytically in the strong segregation limit. In contrast to previous calculations by Semenov and by self-consistent mean-field theory, both the translational entropy of the micelles in a disordered micelle regime and t…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTThemoreversible Cross-Linking Rubber Using Supramolecular Hydrogen-Bonding NetworksKeisuke Chino and Makoto AshiuraView Author Information Research & Development Center, The Yokohama Rubber, Co. Ltd., 2-1 Oiwake, Hiratsuka, Kanagawa 254-8601, Japan Cite this: Macromolecules 200…
Regenerated cellulose (RC) films having various viscosity-average molecular weights ( M η ) ranging from 2.2 × 10 4 to 8.2 × 10 4 g/mol were prepared from cotton linters in 6 wt % NaOH/4 wt % urea aqueous solution by coagulation with 2 M acetic acid and 2% H 2 SO 4 aqueous solution. The dissolution of cellulose and th…
We study the behavior of water droplets confined in a carbon nanotube by means of parallel molecular dynamics simulations. We report radial density profiles, radial hydrogen bond distributions, and contact angles for tube radii ranging from 12.5 to 37.5 Å and for droplets containing up to 4632 water molecules. Our res…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSubstituent Effects on Microstructure and Polymerization of PolyalkylsilsesquioxanesHie-Joon Kim, Jin-Kyu Lee, Jin-Bum Kim, Eun Su Park, Sung-Jun Park, Dae Young Yoo, and Do Y. YoonView Author Information School of Chemistry, Seoul National University Seoul 151-747, Ko…
Abstract Ten model coatings, selected and obtained from a family of fluorinated resins synthesized by the reaction of perfluoroether oligomeric diols of different molecular weights with polyisocyanurates of hexamethylenediisocyanate (HDI) and isophoronediisocyanate (IPDI), were characterized with differential scanning…
Ytterbium metal reacts with PhEEPh (E = S, Se, Te) and elemental Se in pyridine to give (pyridine)(8)Yb(4)(SeSe)(2)(Se)(2)(mu(2)-SPh)(2)(SPh)(2), (py)(8)Yb(4)Se(SeSe)(3)(SeSeSePh)(Se(0.38)SePh), and (py)(8)Yb(4)Se(SeSe)(3)(SeSeTePh)(SeTePh), respectively. The SePh and TePh compounds contain a square array of Ln(III) i…
The electrodeposition of polysiloxane precursor polymers to form cross-linked conjugated polythiophene ultrathin films is described. The precursor polymer contains a polysiloxane backbone with pendant electroactive thiophene monomer units synthesized via a hydrosilylation reaction. The thiophene units were electropoly…
Geranylgeranylglyceryl diphosphate synthase (GGGP synthase) catalyzes alkylation of (S)-glyceryl phosphate [(S)-GP] by geranylgeranyl diphosphate (GGPP) to produce (S)-geranylgeranylglyceryl phosphate [(S)-GGGP]. This reaction is the first committed step in the biosynthesis of ether-linked membrane lipids in Archaea.…
Electrochromic devices composed of laminated polymer layers, as the working electrode, and vanadium pentoxide, as the counter electrode, were prepared and evaluated. Three different laminate systems were investigated using various combinations of poly(3,4-ethylenedioxythiophene), poly( N -methylpyrrole), and polyanili…