Materials Literature
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The degradation kinetics of polycarbonate [poly(bisphenol A carbonate)] in benzene catalyzed by commercial (rutile) TiO 2 (BET surface area = 11 m 2 /g), anatase TiO 2 (156 m 2 /g), and 1 atom % Pt/TiO 2 (111 m 2 /g), prepared by the solution combustion technique, was investigated at various temperatures (230−280 °C)…
With a highly encumbered manganese porphyrin as catalyst, significant improvements in regioselectivity towards less substituted C-C double bond in diene epoxidation were attained by simply adding organic bases as axial ligand.
We study the nonequilibrium diffusion dynamics of supersonic lattice solitons in a classical chain of atoms with nearest-neighbor interactions coupled to a heat bath. As a specific example we choose an interaction with cubic anharmonicity. The coupling between the system and a thermal bath with a given temperature is…
Adsorption (binding) isotherms of three cationic surfactants (hexadecyl trimethylammonium bromide, dodecyl trimethylammonium bromide, and decyl trimethylammonium bromide) bound to poly(acrylic acid) brushes were determined by means of optical reflectometry. The adsorption occurs reversibly. The shape of the isotherms…
Compared with a monolayer culture, hepatocyte spheroids are known to maintain liver function for long periods. We found that hepatocytes formed spheroids when cultured on polyamidoamine dendrimers modified with fructose. Because galactose is a ligand for the asialoglycoprotein receptor on the hepatocyte cytoplasmic me…
A Comment on the Letter by A. Böker et al., Phys. Rev. Lett. 89, 135502 (2002). The authors of the Letter offer a Reply.Received 21 October 2002DOI:https://doi.org/10.1103/PhysRevLett.90.049601©2003 American Physical Society
Reversible photochemical phase transition behavior of some alkoxy-cyano-substituted diphenylbutadiene liquid crystals has been studied. The EE isomers of these derivatives were found to undergo photoisomerization to yield thermally stable EZ and ZE isomers, which could be transformed back to the EE isomer using light…
The cyclic liquid crystalline trimer TPB-(c)9(3) was investigated by optical retardation and Fréedericksz techniques within a few tens of millikelvins of the superheating limit of the nearly second-order nematic-isotropic phase transition. Both the optical retardation and the Fréedericksz bend threshold voltage are in…
Strong blue upconversion emission has been observed from Y 2 O 3:Tm 3+ phosphors under 632.8-nm excitation, in addition to weaker green and red emissions. All of these emissions, including the red, showed a two-photon intensity dependence on the incident 632.8-nm laser power. The emissions that showed only a one-photo…
Abstract For Abstract see ChemInform Abstract in Full Text.
The cationic [Ln(EDTA-PA2)]+ complexes (EDTA-PA2 = EDTA-bispropylamide) have been characterised by a multinuclear NMR study. 89Y and 13C NMR data indicate the formation of 1 ∶ 1 and 1 ∶ 2 (Ln ∶ ligand) complexes in aqueous solution. The stability constants of these complexes, as determined by potentiometric measuremen…
The nematic order parameter S = 〈P2(cosθ)〉 was calculated from the dielectric relaxation time characterizing the molecular rotation around the short axes using formulae derived by Coffey et al. (W. T. Coffey, Yu. P. Kalmykov and J. P. Waldron, Liq. Cryst., 1995, 18, 677; W. T. Coffey, D. S. F. Crothers, Yu. P. Kalmyko…
Here we study the line defect in a hyperswollen lamellar phase of lyotropic liquid crystal by applying a laser trapping method. We have succeeded in directly measuring the tension of a single isolated line defect and the adhesion energy between two defects. We demonstrate a new possibility of intentional patterning of…
A novel highly ordered layered superlattice multibilayer film is prepared by casting the chloroform solutions of ionic complex between a polyoxotungstoeuropate anion EuW10O369− (EuW10) and a hexadecyltrimethylammonium cation (C16TA) on hydrophilic substrates. A variety of techniques, including FT-IR and UV–vis spectro…
Abstract An ultrasonic irradiation route (USI route) is developed to synthesize whisker-like copper sulfide (Cu9S8) nanocrystals via the reaction between copper sulfate pantahydrate (CuSO4·5H2O) and thioacetamide (CH3CSNH2) in an aqueous solution at room temperature under ambient pressure. XRD, TEM, UV–vis and PL spec…
Abstract The local spin formalism ( Clark, A. E.; Davidson, E. R. J Chem Phys 2001, 115, 7382–7392 ) for computing expectation values 〈 S A · S B 〉 that appear in the Heisenberg spin model has been extended to semiempirical single determinant wave functions. An alternative derivation of expectation values in restricte…
Thermodynamically, polymer crystallization is a first-order transition that involves overcoming an energy barrier. Building a molecular kinetic model that links this macroscopic concept with experimental observations has been and still remains a difficult issue. It requires a physical picture that can show how a three…
The effect of frozen storage (-10 and -30 degrees C), formaldehyde, and fish oil on collagen, isolated from cod muscle, was investigated. Salt- and acid-soluble collagen fractions as well as insoluble collagen indicated changes in solubility on frozen storage. Differential scanning calorimetry (DSC) showed a highly co…
The novel five- and seven-membered ring appended aminoporphyrazines 3 and 12 have been prepared via mixed Linstead macrocyclization. The structures of both have been unequivocally established by X-ray crystallographic studies. Reductive deselenation of selenadiazole 3 in the presence of 9,10-phenanthrenequinone or 2,3…
The structure of a crystal of Sr(0.61)Ba(0.39)Nb(2)O(6) has been solved and refined as an incommensurate structure in five-dimensional superspace. The structure is tetragonal, superspace group P4bm(pp1/2,p - p1/2), unit-cell parameters a = 12.4566 (9), c = 7.8698 (6) A, modulation vectors q(1) = 0.3075 (6) (a* + b*),…