Materials Literature
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OBJECTIVES: Autologous vein grafts are still widely used, but their long-term patency is suboptimal. The objective of the current study was to determine whether wrapping a vein graft in gelatin hydrogel sheet incorporating basic fibroblast growth factor improves their mechanical and physiological properties. METHODS A…
p‐Xylylene diazide (XDA) and dipropargyl ether of bisphenol A (DPEBPA) were synthesized and then a novel polytriazole, poly(4,4′‐(propane‐2,2‐diyl) diphenyl‐oxy‐methylene‐1,5 (and 1,4)‐(1,2,3‐triazole)‐p‐xylene), was prepared from XDA and DPEBPA by 1,3‐dipolar cycloaddition polymerization and characterized by FTIR, 1H…
A novel chemical modification method of acrylic fiber was employed by grafting of casein—a natural polymer, onto the surface of acrylic fiber. The effects of reaction conditions, such as chlorination time, chlorination temperature, grafting time and temperature, and pH value on grafting efficiency were investigated sy…
Modified fumed silica-epoxy nanocomposites were obtained by refluxing epoxy molecule with fumed silica using imidazole as catalyst. The modified fumed silica was then used as filler in epoxy resin with amine as curing agent. The properties of the surface modified silica and their effect as fillers in bulk epoxy compos…
A comprehensive treatment of the limitations and possibilities for single-pulse selection in synchrotron operating modes with approximately 150 ns bunch separation, as occurs in the standard operating mode at the Advanced Photon Source, is presented. It is shown that the strength of available materials and allowable k…
C 70 peapods (C 70 @SWCNT) have been studied for the first time under chemical and electrochemical doping by in situ Raman spectroelectrochemistry. The bleaching of Raman features of single-walled carbon nanotubes (SWCNT) and the downshift of the frequency of their tangential mode confirmed the strong chemical doping…
The equilibrated grain boundary groove shapes for commercial purity pyrene (PY) were directly observed by using a temperature gradient stage. From the observed grain boundary groove shapes, the Gibbs-Thomson coefficient and solid-liquid interfacial energy of PY have been determined to be (8.9±0.9)×10−8Km and (21.9±3.3…
Chitosan is a natural based polymer obtained by alkaline deacetylation of chitin, exhibiting excellent properties such as non‐toxicity, biocompatibility and biodegradability. N‐Methylenephenyl phosphonic chitosan (NMPPC) is synthesized from chitosan by reacting with phenyl phosphonic acid using formaldehyde. The NMPPC…
Abstract New photocrosslinkable maleimide copolymers have been synthesized by the attachment of a tricyanopyrrolidene‐based chromophore. The 2‐(3‐cyano‐4‐(2‐{4‐[hexyl‐(6‐hydroxy‐hexyl)‐amino]‐phenyl}‐vinyl)‐5‐oxo‐1‐{4‐[4‐(3‐oxo‐3‐phenyl‐propenyl)‐ phenoxy]‐butyl}‐1,5‐dihydro‐pyrrol‐2‐ylidene)‐malononitrile chromophore…
Recent research progress using X-ray cryo-crystallography with the photon beams from third-generation synchrotron sources has resulted in recognition that this intense radiation commonly damages protein samples even when they are held at 100 K. Other structural biologists examining thin protein crystals or single part…
Understanding how impurities such as nitrogen are included in diamond nanoparticles is expected to be important for use in future nanodevices, such as qubits for quantum computing. Most commercial diamond nanoparticles contain approximately 2-3% nitrogen, but it is difficult to determine experimentally whether it is l…
X-ray exposure during crystallographic data collection can result in unintended redox changes in proteins containing functionally important redox centers. In order to directly monitor X-ray-derived redox changes in trapped oxidative half-reaction intermediates of Paracoccus denitrificans methylamine dehydrogenase, a c…
New conjugated thiopheno azomethines using a stable 2,5-diamino thiophene precursor are presented. The spectroscopic and photophysical studies of these compounds confirm they dissipate their excited state energy predominately by internal conversion and not by intersystem crossing. Crystallographic data show the thermo…
We apply time-dependent density-functional quadratic response theory to investigate the static and dynamic second-order polarizabilities (first hyperpolarizability) beta. A new implementation using Slater-type basis functions, numerical integration, and density fitting techniques is reported. The second order coupled…
Abstract The presence of citric acid in decontamination waste can cause complexation of radioactive cations, resulting in interferences in their removal by various treatment processes such as chemical precipitation and ion exchange, and may pose a potential danger to the environment. Mesoporous Fe‐MCM‐41 molecular sie…
Ti O 2 nanoparticles doped with 1%, 5%, and 10% M (M=Co, Fe, and Ni) were prepared by microwave irradiation and characterized using x-ray diffraction, transmission electron microscopy, and magnetometry. The as-prepared samples are found to be paramagnetic at room temperature, with the magnetic susceptibility following…
We have investigated the growth of BiSbTe3 films by metal organic vapor phase epitaxy on (001) GaAs vicinal substrates. A detailed experimental study of the surface morphologies of BiSbTe3 films grown on GaAs (001) vicinal surfaces was carried out and is discussed in this paper with a view to understanding the step-st…
Submerged Arc Welding (SAW) is one of method for welding process which used for the extensions of heavy construction, for example bridge construction. Broadness usage of SAW caused by welding process can be done automatically and have high reliability. Microstructure and toughness properties of weld metal were influen…
Materials have very important influence on the environmental impact of the product life cycle from production to disposal and recycling. The environmental factors should be considered when product materials are selected, in order to improve the environmental friendliness of products. Due to the complexity of product m…
Nonlinear fitness–space–structure adaptation and principal component analysis in genetic algorithms: an application to x-ray reflectivity analysis, Tiilikainen, J, Tilli, J-M, Bosund, V, Mattila, M, Hakkarainen, T, Airaksinen, V-M, Lipsanen, H