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排序方式: 共有120条查询结果,搜索用时 31 毫秒
81.
82.
Akira Furukawa Yukio Imanishi Masao Tanihara 《Journal of polymer science. Part A, Polymer chemistry》2003,41(21):3227-3242
We designed a new type of styrenyl compound applicable to conventional photopolymerization systems, aiming at the production of polymers with improved mechanical properties, resistance to chemicals, and elevated glass‐transition temperatures (Tg's). A series of styrenyl monomers bearing 2,5‐dithio‐1,3,4‐thiadiazole groups were prepared, and their reactivity was studied in solid‐state photopolymerization initiated by 2‐(4′‐methoxystyryl)‐4,6‐bis(trichloromethyl)‐1,3,5‐triazine. These monomers exhibited much higher polymerization rates than usual, and the final conversion nearly reached completion, despite the relatively high Tg of the solid‐state photopolymerization system. Even at temperatures below Tg, the polymerization proceeded without a ceiling phenomenon. These features were explained by intermolecular interactions between the monomers that induced monomer alignments effective for solid‐state polymerization, large excess free volumes arising from rotation around the methylthio groups, and intramatrix radical migration leading to encounters with the remaining monomers. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 3227–3242, 2003 相似文献
83.
Matsui T Matsukawa N Iwahori K Sano K Shiba K Yamashita I 《Langmuir : the ACS journal of surfaces and colloids》2007,23(4):1615-1618
A two-dimensional hexagonally close-packed (2D-HCP) array of ferritin molecules with a nanoparticle core was fabricated directly on a carbonaceous solid substrate by genetically modifying the outer surface of the ferritin with carbonaceous materials-specific binding peptides. The displayed peptides endowed ferritins with a specific protein-substrate interaction and masked the strong nonspecific interaction. The specific interaction was weak enough to allow ferritins to be rearranged as well as an attractive protein-protein interaction that could be adjusted by selecting the buffer conditions. This method not only produced 2D-HCP arrays of ferritin but also 2D-ordered arrays of independent inorganic nanoparticles after protein elimination that can be applied to floating gate memories. 相似文献
84.
Visualization of the Heterogeneity of Cerium Oxidation States in Single Pt/Ce2Zr2Ox Catalyst Particles by Nano‐XAFS
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Dr. Nozomu Ishiguro Prof. Dr. Tomoya Uruga Dr. Oki Sekizawa Dr. Takuya Tsuji Dr. Motohiro Suzuki Dr. Naomi Kawamura Dr. Masaichiro Mizumaki Dr. Kiyofumi Nitta Prof. Dr. Toshihiko Yokoyama Prof. Dr. Mizuki Tada 《Chemphyschem》2014,15(8):1563-1568
The cerium oxidation states in single catalyst particles of Pt/Ce2Zr2Ox (x=7 to 8) were investigated by spatially resolved nano X‐ray absorption fine structure (nano‐XAFS) using an X‐ray nanobeam. Differences in the distribution of the Ce oxidation states between Pt/Ce2Zr2Ox single particles of different oxygen compositions x were visualized in the obtained two‐dimensional X‐ray fluorescent (XRF) mapping images and the Ce LIII‐edge nano X‐ray absorption near‐edge structure (nano‐XANES) spectra. 相似文献
85.
Yasushi Morihara Shin‐Ichi Ogata Masanobu Kamitakahara Chikara Ohtsuki Masao Tanihara 《Journal of polymer science. Part A, Polymer chemistry》2005,43(23):6048-6056
A triple‐helix‐forming collagen model peptide, (prolyl‐trans‐4‐hydroxyprolyl‐glycyl)10 [(Pro‐Hyp‐Gly)10], and a thermosensitive elastin‐derived pentapeptide, valyl‐prolyl‐glycyl‐valyl‐glycyl (Val‐Pro‐Gly‐Val‐Gly), were copolymerized in various mole ratios using 1‐ethyl‐3‐(3‐dimethylaminopropyl)‐carbodiimide hydrochloride and 1‐hydroxybenzotriazole in dimethyl sulfoxide at 20 °C. All of the obtained polypeptides have molecular weight higher than 103 and contain a triple‐helical structure, and showed an inverse phase transition from transparent solution to turbid suspension in response to a rise in temperature. The lower critical solution temperature of the polypeptide solution decreased upon increasing the content of Val‐Pro‐Gly‐Val‐Gly. Furthermore, polypeptides containing 82–86 mol % of Val‐Pro‐Gly‐Val‐Gly in composition showed reversible gel formation, suggesting that (Pro‐Hyp‐Gly)10 acts as a hydrated unit and Val‐Pro‐Gly‐Val‐Gly acts as a thermosensitive crosslinking point. These biodegradable thermosensitive polypeptides may be useful for biomedical applications, including, as a scaffold for tissue regeneration. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 6048–6056, 2005 相似文献
86.
Maity N Wattanakit C Muratsugu S Ishiguro N Yang Y Ohkoshi S Tada M 《Dalton transactions (Cambridge, England : 2003)》2012,41(15):4558-4565
A site-isolated SiO(2)-supported Ru-monomer complex, whose structure was characterized by means of solid-state NMR, XPS, UV/vis, and Ru K-edge EXAFS, was found to be efficient for sulfoxidation using an O(2)/aldehyde system. Significant enhancement of sulfoxidation rates was observed on the SiO(2)-supported Ru complex for various sulfide derivatives. 相似文献
87.
88.
A comparison of the stereochemistry of liver microsomal γ-hydroxylation of some cyclic α, β-unsaturated ketones with that of electrochemical γ-acetoxylation of the corresponding dienol esters and with that of peracid oxidation of the dienol esters has been carried out. 相似文献
89.
90.
Transient absorption spectra and decay profiles of HO2 have been measured using cw near-IR two-tone frequency modulation absorption spectroscopy at 297 K and 50 Torr in diluent of N2 in the presence of water. From the depletion of the HO2 absorption peak area following the addition of water, the equilibrium constant of the reaction HO2 + H2O <--> HO2-H2O was determined to be K2 = (5.2 +/- 3.2) x 10(-19) cm3 molecule(-1) at 297 K. Substituting K2 into the water dependence of the HO2 decay rate, the rate coefficient of the reaction HO2 + HO2-H2O was estimated to be (1.5 +/- 0.1) x 10(-11) cm3 molecule(-1) s(-1) at 297 K and 50 Torr with N2 as the diluent. This reaction is much faster than the HO2 self-reaction without water. It is suggested that the apparent rate of the HO2 self-reaction is enhanced by the formation of the HO2-H2O complex and its subsequent reaction. Results are discussed with respect to the kinetics and atmospheric chemistry of the HO2-H2O complex. At 297 K and 50% humidity, the concentration ratio of [HO2-H2O]/[HO2] was estimated from the value of K2 to be 0.19 +/- 0.11. 相似文献