Materials Literature
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Synthetic vascular grafts do not spontaneously endothelialize in humans and require some form of anticoagulation to maintain patency. Preseeding synthetic graft materials such as expanded polytetrafluoroethylene (ePTFE) and polyethylene terephthalate (PET) with endothelial cells (EC) has been examined in various in vi…
Abstract An efficient grid search procedure successfully applied to the solution of three unknown molecular structures from X-ray and neutron powder diffraction data is presented.
The electronic structure and bond properties of a lattice defect in silicon formed by the incomplete recombination of a vacancy-interstitial pair are described by combining tight-binding molecular-dynamics and ab initio Hartree-Fock calculations. The defect structure consists of a large nuclear distortion nearly perfe…
The morphology and crystallography of α(hcp) precipitates formed in the β(bcc) matrix were examined in the Ti–Mo binary alloys with various Mo contents below the currently proposed monotectoid temperature by means of transmission electron microscopy.In the Ti-10, 20 and 30 mass%Mo alloys, α precipitates form on β grai…
This report presents the design of an undulator beamline at SPring-8 to be used for soft X-ray spectroscopy focused on radioactive materials. Photoemission spectroscopy experiments are carried out in a radioisotope (RI)-controlled area where actinide compounds as well as unsealed radioactive materials are usable. Intr…
Abstract In modelling electron backscattering from solids using Monte Carlo simulations, knowledge of mean atomic number, mean atomic weight, and density of the bulk material are required. We studied four different ways in common useforthe calculation of mean atomic number. An alternative and improved approach is to c…
The hydrothermal reactions of CuCN and Cu(NO3)2·2.5H2O with the appropriate organonitrogen ligand in water yielded a one-dimensional chain, [Cu4(CN)4(biquin)] 1, and a material with a two-dimensional anionic honeycomb network and interpenetrating binuclear cations, [{Cu2(bpy)2(CN)}Cu5(CN)6] 2.
Thin films of silica-alkyltrimethylammonium (alkyl=decyl, dodecyl, tetradecyl, hexadecyl and octadecyl) chloride mesostructured materials are synthesized by spin coating the precursor solutions containing prehydrolyzed tetramethoxysilane and alkyltrimethylammonium salts. The films have been converted to transparent po…
Novel lactide-based poly(ethylene glycol) (PEG) polymer networks (GL9-PEGs) were prepared by UV copolymerization of a glycerol-lactide triacrylate (GL9-Ac) with PEG monoacrylate (PEG-Ac) to use as scaffolds in tissue engineering, and the surface properties and biocompatibility of these networks were investigated as a…
An exact analytic formula is presented for the magnetostatic field produced by a three-dimensional array of uniformly magnetized rectangular prisms. It is derived from the volume integration of a point-function demagnetizing tensor. The values of the point-function demagnetizing tensor at the centers of rectangular pr…
Electrochemical oxidation of [5,15-bis(3,5-di-tert-butylphenyl)porphyrinato]zinc(II) 1, [5,15-bis(4-methoxycarbonylphenyl)porphyrinato]zinc(II), [5,15-bis(pentafluorophenyl)porphyrinato]zinc(II) or [10-bromo-5,15- diphenylporphyrinato]zinc(II) in benzonitrile using a platinum net as the working electrode afforded the…
In the presence of NBun4Br acting as phase-transfer reagent, organophosphonic acids RPO(OH)2 reacted in acetonitrile with the trivacant tungstophosphate sodium salt β-A-Na8[HPW9O34]·24H2O to give hybrid organophosphoryl polyoxotungstate derivatives α-A-[NBun4]3Na2[PW9O34(RPO)2] (R = Et 1, Bun 2, But 3, allyl 4 or Ph 5…
Manganese-exchanged MCM-41 modified with a chiral salen is an effective enantioselective heterogeneous epoxidation catalyst for cis-stilbene.
Recent developments in the functionalisation of tetrathiafulvalene (TTF) have enabled TTF units to be covalently linked into macromolecular systems. Convergent syntheses of dendrimers containing TTF units are presented, including a (TTF)13 system in which TTF units are emplaced at all layers of the structural hierarch…
Photochemical phase transition behavior of polymer liquid crystals (LCs) with donor−acceptor azobenzene moieties which contain both electron-donating and -accepting substituents at the 4,4‘-positions has been explored. Polymer azobenzene LCs were prepared which show nematic (N) LC behavior in the trans form but no LC…
Introduction and Overviews: Structure and Composition of Interfaces in Ceramics and Ceramic Composites M. Ruhle, et al. Microstructures and Interfaces: Near Atomic Scale Nanochemistry and Structure: Ceramic Grain Boundaries and Interfaces R.W. Carpenter, W. Braue. Sintering and Grain Growth: Microdesigned Interfaces:…
A small-diameter vascular prosthesis with potential for clinical use was prepared from a Dacron prosthesis coated with nonthrombogenic polymeric materials. As a coating material, segmented poly(etherurethane) (SPU; Tecoflex 60) was blended with a phospholipid polymer, 2-methacryloyloxyethyl phosphorylcholine (MPC) pol…
Cube-octameric polyhedral silsesquioxanes (R8Si8O12) react with strong acids (HX) to produce R8Si8O11X2 frameworks resulting from selective cleavage of one Si–O–Si linkage; subsequent hydrolysis affords R8Si8O11(OH)2 frameworks derived from the net hydrolysis of one Si–O–Si linkage in R8Si8O12; these results demonstra…
Strong metal-based emission with [TbL1] in aqueous media occurs in the absence of protons and oxygen; dissolved molecular oxygen quenches the phenanthridyl triplet (1/KSV = 58 Torr O2) but back-energy transfer to the organic triplet occurs efficiently only with the excited protonated complex (pKa″ = 5.7).
The absolute configuration of the four stereoisomeric α-substituted derivatives of dota has been defined; in their Eu complexes, 2D-NMR methods have revealed that in solution ring inversion is independent of pendant arm rotation and the (RRRR)-[EuL1a] complex which in the solid state crystallises as a square antiprism…