Materials Literature
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Blending porphyrins and calixpyrroles, the calix[n]phyrins 1 (n=4, 6, 8; x=1, 2, 3; Ar=C6H2(CH3)3) are easily prepared by condensing an appropriately functionalized dipyrromethane with acetone followed by oxidation with 4,5-dichloro-3,6-dioxo-1,2-benzenedinitrile. The structure of these molecules show a competition be…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDendritic Physical Gel: Hierarchical Self-Organization of a Peptide-Core Dendrimer to Form a Micrometer-Scale Fibrous AssemblyWoo-Dong Jang, Dong-Lin Jiang, and Takuzo AidaView Author Information Department of Chemistry and Biotechnology Graduate School of Engineering…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Nanocrystalline CuMS2 (M = In or Ga) through a Solvothermal ProcessQingyi Lu, Junqing Hu, Kaibin Tang, Yitai Qian, Guien Zhou, and Xianming LiuView Author Information Structure Research Laboratory and Department of Chemistry, University of Science and Technology of…
We employ a new method for studying compositionally disordered ferroelectric oxides. This method is based on the virtual crystal approximation (VCA), in which two or more component potentials are averaged into a composite atomic potential. In our method, we construct a virtual atom with the correctly averaged atomic s…
We describe the introduction of titanium centers to cubic MCM-48 and SBA-15 mesoporous silica by hydrothermal and postsynthetic grafting techniques. MCM-48 was hydrothermally prepared with a gemini surfactant that favors the cubic phase and leads to a high degree of long-range pore ordering. This phase was chosen due…
This paper presents a general method to prepare three-dimensionally ordered macroporous (3DOM) metal oxides or carbonates via templating with polystyrene (PS) spheres. The method is based on templated precipitation of metal salts (acetates, oxalates, oxides) within a colloidal crystal of PS spheres and subsequent chem…
Interfacial interaction is one of the most critical issues in carbon nanotube/polymer composites. In this paper the role of nonionic surfactant is investigated. With the surfactant as the processing aid, the addition of only 1 wt % carbon nanotubes in the composite increases the glass transition temperature from 63 °C…
Cdc42Hs is a member of the Ras superfamily of GTPases and initiates a cascade that begins with the activation of several kinases, including p21-activated kinase (PAK). We have previously used a 46 amino acid fragment of PAK (PBD46) to define the binding surface on Cdc42Hs [Guo et al. (1998) Biochemistry 37, 14030-1403…
The radius of gyration 〈 S 2 〉 1/2, hydrodynamic radius R H, intrinsic viscosity [ η ], and second virial coefficient A 2 for cellulose tris(phenyl carbamate) (CTC) in tetrahydrofuran (THF) at 25 °C were determined in a wide range of molecular weights, 1.91 × 10 4 to 392 × 10 4, by static and dynamic light scattering…
The method of self-consistent Brownian dynamics developed recently has been adapted to simulate the properties of bimodal polymer brushes under shear. Simulations of three systems with different compositions have been carried out for a range of shear rate values. In the absence of shear, the free ends of short and lon…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTToward Structural Biology in Supercooled WaterJack J. Skalicky, Dinesh K. Sukumaran, Jeffrey L. Mills, and Thomas SzyperskiView Author Information Department of Chemistry State University of New York at Buffalo Buffalo, New York 14260 Cite this: J. Am. Chem. Soc. 2000,…
Rice husk ash was incorporated into natural rubber (NR) using a laboratory size two-roll mill. Curing using a conventional vulcanization system (CV) was chosen, and cure studies were carried out on a Monsanto rheometer. Physical testing of the NR vulcanizates involved the determination of tensile, tear, and abrasion r…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSpin Alignment in Singly Oxidized Spin-Polarized Diradical Donor: Thianthrene Bis(nitronyl nitroxide)Akira Izuoka, Mayumi Hiraishi, Taro Abe, Tadashi Sugawara, Kazunobu Sato, and Takeji TakuiView Author Information Department of Basic Science Graduate School of Arts an…
An organic molecule containing cobalt phosphate (denoted CoPO-GIS) which is isostructural with the zeolite gismondine has been synthesized under solvothermal conditions by using [Co(en)3]Cl3 and phosphoric acid as the reactants and ethylene glycol as the solvent. CoPO-GIS ((H3NCH2CH2NH3)0.5.CoPO4) crystallizes in the…
Red-colored and solvent-free membranes based on the picket fence cobaltporphyrin (CoP) complexed with two or three kinds of polymer−ligands were prepared, and their visible absorbance responses to oxygen partial pressure were studied. The four CoP complexes with copolymers of 4- and 1-vinylimidazole and 4- and 2-vinyl…
Effects of the superconducting pair potential on the impurity scattering processes in metallic carbon nanotubes are studied theoretically. The backward scattering of electrons vanishes in the normal state. In the presence of the superconducting pair correlations, the backward scatterings of electron- and hole-like qua…
The information revolution would have been radically different, or impossible, without the use of the materials known generically as semiconductors. The properties of these materials, particularly the potential for doping with impurities to create transistors and diodes and controlling the local potential by gates, ar…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEpoxidation of Alkenes with Bicarbonate-Activated Hydrogen PeroxideHuirong Yao and David E. RichardsonView Author Information Center for Catalysis, Department of Chemistry University of Florida, Gainesville, Florida 32611-7200 Cite this: J. Am. Chem. Soc. 2000, 122, 13…
The structure of the title compound, C(11)H(13)NO(3), is characterized by a two-dimensional infinite network of intermolecular N-H.O and O-H.O hydrogen bonds.
The synthesis of new acrylate, methacrylate, and styrene with 4-(oxyethoxy)-4′-vinylbarbituratephenyl azobenzene chromophore are described. The monomers were well characterized (NMR, UV, and IR) for the structure. These were then homopolymerized and characterized for spectral responses and thermal properties. The stro…