Materials Literature
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A phenylethynyl terminated imide (PETI) oligomer from the reaction of 3,3',4,4'-biphenyltetracarboxylic dianhydride, an 85:15 molar ratio of 3,4'-oxydianiline and 1,3-bis(3-aminophenoxy)benzene and 4-phenylethynylphthalic anhydride as the end-capper at a theoretical number average molecular weight (Mn) of - 5,000 g/mo…
New molecules with dimesitylboron as the acceptor group and bithiophene as the unsaturated chain have been synthesized and their non-linear optical properties investigated. The theoretical first hyperpolarizabilities determined by calculations are compared with experimental results.
Four crystal structures of the title complexes have been analyzed by X-ray crystallography. 1: C 80 H 68 N 17 Nd, a = 17.0545(6) Å, c = 22.807(3) Å, tetragonal, P 4/ ncc, Z = 4. 2: C 80 H 68 N 17 Gd, a = 17.399(8) Å, c = 11.377(6) Å, tetragonal, P 42 1 2, Z = 2. 3: C 80 H 70 N 17 OHo, a = 18.096(5) Å, c = 11.079(6) Å,…
The breakdown of benzene, ethylbenzene, styrene, and o -chlorotoluene in aqueous solution by 520 kHz ultrasonic waves was studied at various initial concentrations in the millimolar range. First-order reaction rates depend upon both initial concentration and sonication time. These variations can be explained by a mode…
Thin films of monophasic crystalline hexagonal ZnO were deposited from solutions of zinc acetate in presence of ethane-1,2-diamine and sodium hydroxide onto glass microscope slides and tin oxide coated glass. At least two distinct morphologies of ZnO were observed, depending on the deposition conditions, by scanning e…
Electron transfer (eT) rate constants are determined, in part, by the magnitude of donor (D)/acceptor (A) electronic coupling, {vert_bar}V{vert_bar}. When the D and A are separated beyond van der Waals contact, the intervening medium may mediate {vert_bar}V{vert_bar}. Herein, we report (1) electronic coupling mediated…
Interaction of hydrogen with a series of mixed oxides CeMx(M = Cu, Ni; 0 < x⩽ 5) precursors of catalysts for hydrogenation reactions has been studied in the 300–1073 K temperature range. In situ XRD, XPS, EPR and thermogravimetric techniques have been used to characterize the processes occurring during the hydrogen tr…
On the basis of the available high-resolution structures of mandelate racemase (MR) from Pseudomonas putida [Landro, J.A., Gerlt, J.A., Kozarich, J.W., Koo, C.W., Shah, V.J., Kenyon, G.L., Neidhart, D.J., Fujita, J., & Petsko, G.A. (1994) Biochemistry 33, 635-643], Lys 166 and His 297 are positioned appropriately to p…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTβ-Silyl Organocuprates: The Grail of Organocuprate Chemistry?1aSteven H. Bertz, Magnus Eriksson, Guobin Miao, and James P. SnyderView Author Information Complexity Study Center Mendham, New Jersey 07945 Department of Organic Chemistry Chalmers University of Technology…
A semiempirical mathematical model has been developed to predict inhibitor efficiency for barium sulfate scale control in industrial processes. This model can be used for selecting effective inhibitors and determining the minimal effective concentration needed for a given system. The model incorporates experimental da…
The method of time-resolved dynamic nonradiative excitation energy transfer (ET) was used to analyze the proposed domain closure in adenylate kinase (AK). A highly active mutant of Escherichia coli AK, (C77S, V169W, A55C)-AK, was prepared, in which the solvent- accessible residues valine 169 and alanine 55 were replac…
An abnormally strong negative magnetization has been found in the metamagnetic extended structure derived from assembled [Mn(CN)6]3- and [Mn(5-Clsalen)]+ in a two dimensional array of Mn(III) ions, which contains the repeating cyclic octameric unit.
The pillaring of Mg(3)Al layered double hydroxides (LDHs) by the title polyoxometalates (POMs) was accomplished by ion exchange reaction of the LDH-hydroxide and -adipate precursors with the POM anion at ambient or refluxing temperatures. The structural, thermal and textural properties of the LDH-POM intercalates were…
The quantity and chemical nature of carbonaceous impurities remaining on polycrystalline Ag surfaces after preparation depend on the protocol used for cleaning. The effectiveness of several preparation protocols was investigated in this study: mechanical polishing with successively finer grades of alumina, Ar + sputte…
Using recently calculated rate coefficients for reactive coupling of chains at polymer−polymer interfaces, we describe the diffusion-controlled growth of diblock copolymer at the interface between dissimilar molten homopolymer films. The growth exhibits several regimes, successively controlled by (1) the quasilocal re…
A model composed of a synthesis of the nonlinear Cahn−Hilliard and Flory−Huggins theories for spinodal decomposition (SD) and a second-order rate equation for the self-condensation of a trifunctional monomer is presented and used to analyze polymerization-induced phase separation (PIPS). The numerical results replicat…
We describe laboratory experiments on millimeter-sized drops of liquid in air which indicate that both thermocapillary and isothermal shear flows are able to prevent the coalescence of bodies of liquid which would occur readily in the absence of such flows. We have also carried out molecular dynamics computer simulati…
Phosphatidylcholine vesicles provide reaction compartments for synthesis of size-quantized CdS nanocrystals of dimension predicted to within 2.5 Å on the basis of initial encapsulated CdCl 2 concentration and vesicle diameter. Vesicle formation by detergent dialysis of phosphatidylcholine/hexylglucoside mixed micelles…
The melting behavior of three representative semirigid polymers, poly(aryl ether ether ketone), poly(ethylene terephthalate), and poly(ethylene naphthalenate), has been studied. Analysis of experimental results indicates that the melting process is morphologically the reverse of the isothermal crystallization process…
We have studied the conformation of a polymer brush in equilibrium with a solvent that is subject to a shear flow. The interplay between the polymer brush and the hydrodynamic flow of the solvent has been modeled, with simple but largely justifiable approximations. The main technique used in our study is a Monte-Carlo…