Materials Literature
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The synthesis and both spectroscopic and electrochemical studies of a bis-porphyrinic tweezer are reported, as well as the insertion of Lewis base guests into the host bis-porphyrinic cavity, monitored through physico-chemical characteristics.
Rhamnolipids and poly(beta-hydroxyalkanoic acids) (PHAs) are important fermentation products of Pseudomonas aeruginosa. Both contain beta-hydroxyalkanoic acids as main constituents. To investigate the possible relationship between their syntheses, we studied the n-hexadecane fermentation by P. aeruginosa (ATCC 10145).…
Studies have been made of the addition of cyclohexane (CHX) to O2 + tetramethylbutane (TMB) mixtures between 673 and 773 K in aged boric-acid-coated Pyrex vessels to obtain kinetic data for the reaction of HO2 radicals with CHX. The contribution by OH radicals to the removal of CHX is minimised by the use of a total p…
Alkyd resins of 40% (I), 50% (II), and 60% (III) oil length (OL) were prepared with rubber seed oil (RSO), phthalic anhydride (PA), and glycerol (GLY), employing the two-stage alcoholysis method. Changes in the physical characteristics of the reaction medium were monitored by determination of the acid value and the nu…
Well-stereocomplexed 1:1 fiber and film were prepared from poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) by the melt-spinning and hot-drawing and the solution-casting methods, respectively, and their hydrolysis in phosphate-buffered solution (pH 7.4) at 37°C was investigated. The decrease rates of weight remaining…
The molecular and crystal structure of one of the crystalline modifications of Bombyx mori, silk I, was determined by x-ray diffraction method. Cell dimensions are essentially the same as those found in the synthetic model peptide poly(L-Ala-Gly). The (straight phi, psi) values of L-Ala and Gly in the repeating unit a…
Natural fiber based composites have the potential to improve the mechanical properties of plastics while reducing the cost and weight. This study shows a practical method of blending natural-fiber with polypropylene to form a mat and then consolidated into a sheet by hot pressing. The natural fibers assessed were Pinu…
フルオロアルキル基が末端に導入されたアクリル酸オリゴマーさらにはスルホン酸オリゴマーが形成する分子集合体は, エイズウイルスと相互作用し, 高選択的な抗エイズウイルス活性を示した. カチオンセグメントを有するフルオロアルキル基含有オリゴマー類においては, フッ素に起因した高い界面活性な性質以外に抗菌活性をも示すことがわかった. アミドセグメントを有する一連のフルオロアルキル基含有オリゴマーが形成する分子集合体は, カルシウムイオンをゲスト分子として効率よく捕捉することができた. 一方, フルオロアルキル基含有N- (1, 1-ジメチル-3-オキソブチル) アクリルアミドオリゴマーが形成する分子集合体は親水性のアミノもしくはN, N…
We have studied the stereospecificities of various pyridoxal 5'-phosphate dependent enzymes for the hydrogen transfer between the C-4' of a bound coenzyme and the C-2 of a substrate in the transamination catalyzed by the enzymes. Prior to our studies, pyridoxal enzymes so far studied were reported to catalyze the hydr…
Magnesia-supported bimetallic Pt–Sn catalysts with various metal contents and Pt/Sn atomic ratios were prepared using the bimetallic complex cis-[PtCl(SnCl3)(PPh3)2] or the monometallic complex cis-[PtCl2(PPh3)2] and SnCl2 as metal precursors. Catalysts were characterised by X-ray diffraction, transmission electron mi…
Upon oxidative dimerization of pale yellow Ar2C=CHPh 1 (Ar = 4-Me2NC6H4), deep blue 1,4-dication 2(2+) was obtained as a stable salt, which was transformed into 1 by reductive C-C bond fission; deprotonation of 2(2+) gave intense yellow diene 3, which was interconvertible with violet dication 4(2+) by two-electron tra…
Nucleation effects of two silicate nucleating agents, attapulgite and diatomite, on the crystallization of polyoxymethylene (POM), were studied by means of differential scanning calorimetry and polarized optical microscopy. The crystallization kinetics of POM with and without nucleating agents was analyzed by means of…
The heptadentate, ‘tritopic’ ligand 2poapH2 reacts with Cu(NO3)2 in the presence of Gd(NO3)3 to give a novel, self-assembled, ferromagnetically coupled, alkoxide bridged octanuclear Cu(II) cluster in the shape of a pin-wheel, with a central Cu4[μ-O4] core, and isolated Curie-like [Gd(NO3)4(H2O)2]− anions.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEquilibrium Elasticity of Diblock Copolymer Micellar LatticeHiroshi Watanabe, Toshiji Kanaya, and Yoshiaki TakahashiView Author Information Institute for Chemical Research, Kyoto University, Uji, Kyoto 611, Japan; and Center for Integrated Research in Science and Engineering, N…
Compared with piezoelectric ceramics and magnetostrictive materials, the shape memory materials possess larger recoverable strain and recovery stress but slower response to external field. It is expected that the magneto shape memory materials may develop considerable strain as well as rapid and precise shape control.…
(2001). Environmental Behavior of Magnesium and Magnesium Alloysd. Materials Technology: Vol. 16, No. 2, pp. 110-126.
A prototype transformer has been designed and built which is novel in its combination of high voltage (50 kV), high frequency (20 kHz) and high power (25 kVA) specifications. The design technique utilized a spreadsheet approach which facilitated an iterative design procedure. The transformer used a ferrite core, nylon…
Abstract The oxidation of cyclohexane with molecular oxygen in the presence of isobutyraldehyde catalyzed by nanostructured iron and cobalt oxides and iron oxide supported on titania has been studied. Nanostructured cobalt oxide on MCM-41 is found to be efficient for catalytic aerobic epoxidation of olefins.
Polyaniline (PANI) films were prepared by electroless surface polymerization of the aniline on an aniline–silane (C6H5NHC3H6Si(OMe)3) modified (aniline primed) ITO electrode. Dense, smooth and strongly adhered films with thickness in the range of 100 nm to 1 µm were isolated. The polyaniline films deposited on aniline…
In this work, filter paper was coated with plasma depositions of hexamethyldisilazane (HMDS), and double layers of HMDS and n-hexane, and HMDS and tetraethyl orthosilicate (TEOS). In the case of double layers of HMDS and TEOS, TEOS deposition times of 2, 4 and 6 minutes were studied. The double layers were interfaced…