排序方式: 共有34条查询结果,搜索用时 46 毫秒
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Romero-Cano MS Martín-Rodríguez A de las Nieves FJ 《Journal of colloid and interface science》2000,227(2):329-333
An experimental desorption study of Triton X-100 from latices with different functionality is presented. Two different strategies to follow the desorption experiment have been used: first, a discontinuous method based on the wash step (centrifugation-removal-redispersion); and second, a continuous method based on the replacement of the disperse media. The desorption results show that in all cases a residual amount of Triton X-100 remains adsorbed, indicating irreversibility of the surfactant adsorption. Finally, the effect of desorption on the colloidal stability of one type of latex-surfactant complex has been analyzed. Copyright 2000 Academic Press. 相似文献
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Kenji Sasaki Osamu Tokuda Takashi Hirota Jiann-Kuan Luo Ronald F. Federspiel Raymond N. Castle 《Journal of heterocyclic chemistry》1997,34(6):1829-1832
The polycyclic heterocyclic compound with a novel ring system, 15-chloro[1]benzothieno[2″,3″:3′,4′]-naphtho[1′,2′:4,5]thieno[2,3-c]quinoline was synthesized via photocyclization of 3-chloro-N-phenyl[1]-benzothieno[2′,3′:3,4]naphtho[2,1-b]fhiophene-2-carboxamide followed by chlorination with phosphorus oxychloride. The assignment of its 1H and 13C nmr spectra was accomplished by utilizing two-dimensional nmr methods. 相似文献
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Jiann‐Kuan Luo Maria P. Cabal Ronald F. Federspiel Raymond N. Castle 《Journal of heterocyclic chemistry》2000,37(4):997-1001
Photocyclization of 3‐chloro‐N‐(9‐phenanthryl)benzo[b]‐thiophene‐2‐carboxamide ( 3 ) and 3‐chloro‐N‐(9‐phenanthryl)‐naphtho[1,2‐b]thiophene‐2‐carboxamide ( 10 ) yielded dibenzo[f,h]benzothieno[2,3‐c]‐quinolin‐10(9H)‐one ( 4 ) and dibenzo[f,h]naphtho[2′,1′:4,5]thieno[2,3‐c]quinolin‐10(9H)‐one ( 11 ), respectively. Further elaboration of the lactams provided three novel unsubstituted new ring systems. 相似文献
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Camenen Y Bortolon A Duval BP Federspiel L Peeters AG Casson FJ Hornsby WA Karpushov AN Piras F Sauter O Snodin AP Szepesi G 《Physical review letters》2010,105(13):135003
The first experimental evidence of parallel momentum transport generated by the up-down asymmetry of a toroidal plasma is reported. The experiments, conducted in the Tokamak à Configuration Variable, were motivated by the recent theoretical discovery of ion-scale turbulent momentum transport induced by an up-down asymmetry in the magnetic equilibrium. The toroidal rotation gradient is observed to depend on the asymmetry in the outer part of the plasma leading to a variation of the central rotation by a factor of 1.5-2. The direction of the effect and its magnitude are in agreement with theoretical predictions for the eight possible combinations of plasma asymmetry, current, and magnetic field. 相似文献
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Jiann-Kuan Luo Ronald F. Federspiel Raymond N. Castle Lyle W. Castle 《Journal of heterocyclic chemistry》1996,33(1):185-189
The synthesis of two previously unknown novel polycyclic heterocyclic ring systems via photocyclization is described. The structural assignment of the isomeric ring systems, 4 and 5 , was achieved by the total assignment of their 1H and 13C nmr spectra by the concerted usage of two-dimensional nmr methods. 相似文献
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Jiann-Kuan Luo Ronald F. Federspiel Raymond N. Castle 《Journal of heterocyclic chemistry》1996,33(3):923-926
The synthesis of two previously unknown polycyclic ring systems, benzo[h]naphtho[1′2′:4,5]-thieno[2,3-c]quinoline ( 1 ) and benzo[h]naphtho[1′,2′:4,5]thieno[2,3-c][1,2,4]triazolo[4,3-a]quinoline ( 2 ), was achieved via oxidative photocyclization of 1-chloro-N-(1-naphthyl)naphtho[2,1-b]thiophene-2-carboxamide ( 5 ). The total assignment of their 1H and 13C nmr spectra was determined by the concerted use of two-dimensional nmr methods. 相似文献
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