Corrosion behavior of AZ91 magnesium alloy under NaCl particle deposition condition was investigated by gravimetric method and surface analysis technique.It was found that the mass gain increased rapidly at the beginn...Corrosion behavior of AZ91 magnesium alloy under NaCl particle deposition condition was investigated by gravimetric method and surface analysis technique.It was found that the mass gain increased rapidly at the beginning of exposure and then slowly with time.The corrosion morphologies were observed and the results showed that NaCl deposition resulted in the occurrence of localized corrosion.The composition of corrosion product was analyzed using X-ray photo electron spectroscopy.It was suggested that the corrosion product was a mixture of oxide and hydroxide of magnesium and aluminum.展开更多
5,10,15,20-Tetrakis（4-amidinophenyl）porphyrin（Por 1）,its Zn complex（Por 2）and amidinophenyl bispophyrin（Por 3）interacting with calf thymus DNA were investigated by scanning electron microscopy（SEM）and the sh...5,10,15,20-Tetrakis（4-amidinophenyl）porphyrin（Por 1）,its Zn complex（Por 2）and amidinophenyl bispophyrin（Por 3）interacting with calf thymus DNA were investigated by scanning electron microscopy（SEM）and the shape and size of the porphyrin–DNA complexes were observed after photo irradiation.The results showed that the shape and size of DNA had signifcant differences with blank group by virtue of the interaction between the porphyrins and ct-DNA.This suggests the morphological characterization could be used to study the interaction and judge DNA photocleavage activity indirectly through the photo irradiation of porphyrins.展开更多
Two donor-σ-acceptor molecules containing tetrathiafulvalene(TTF)and carbazole moieties were synthesized bythe reactionof 9-(4-bromo-butyl)-carbazole(1)with 2,6-bis(hexylthio)-3-(2-cyanoethylthio)-7-(methylthio)-tetr...Two donor-σ-acceptor molecules containing tetrathiafulvalene(TTF)and carbazole moieties were synthesized bythe reactionof 9-(4-bromo-butyl)-carbazole(1)with 2,6-bis(hexylthio)-3-(2-cyanoethylthio)-7-(methylthio)-tetrathiafulvalene(2)or2,6-bis(2-cyanoethylthio)-3,7-bis(methylthio)tetrathiafulvalene(3)in the presence of CsOH·H_(2)O,respectively.The structures of the molecules were characterized by 1 H NMR,13 C NMR,MS,and elemental analyses.They showed negligible intramolecu-lar charge-transfer interaction in their ground states as indicated by their UV-Vis spectroscopics and cyclic voltammetry results.Compared with carbazole,their fluorescence was strongly quenched,which implied that a photo induced electron transfer(PET)interaction between TTF and carbazole moieties occurred.展开更多
基金Projects(50671005,50971093)supported by the National Natural Science Foundation of ChinaProject(2007CB613705)supported by the National Basic Research Program of China
文摘Corrosion behavior of AZ91 magnesium alloy under NaCl particle deposition condition was investigated by gravimetric method and surface analysis technique.It was found that the mass gain increased rapidly at the beginning of exposure and then slowly with time.The corrosion morphologies were observed and the results showed that NaCl deposition resulted in the occurrence of localized corrosion.The composition of corrosion product was analyzed using X-ray photo electron spectroscopy.It was suggested that the corrosion product was a mixture of oxide and hydroxide of magnesium and aluminum.
基金the fnancial supports of National Natural Science Foundation of China (No. 20902071)Scientifc Research Foundation of Wuhan Institute of Technology (No. 10122021)
文摘5,10,15,20-Tetrakis（4-amidinophenyl）porphyrin（Por 1）,its Zn complex（Por 2）and amidinophenyl bispophyrin（Por 3）interacting with calf thymus DNA were investigated by scanning electron microscopy（SEM）and the shape and size of the porphyrin–DNA complexes were observed after photo irradiation.The results showed that the shape and size of DNA had signifcant differences with blank group by virtue of the interaction between the porphyrins and ct-DNA.This suggests the morphological characterization could be used to study the interaction and judge DNA photocleavage activity indirectly through the photo irradiation of porphyrins.
基金This work was supported by National Natural Science Foundation of China(Grant No.20676036)the Key Project of Chinese Ministry of Education(No.03053).
文摘Two donor-σ-acceptor molecules containing tetrathiafulvalene(TTF)and carbazole moieties were synthesized bythe reactionof 9-(4-bromo-butyl)-carbazole(1)with 2,6-bis(hexylthio)-3-(2-cyanoethylthio)-7-(methylthio)-tetrathiafulvalene(2)or2,6-bis(2-cyanoethylthio)-3,7-bis(methylthio)tetrathiafulvalene(3)in the presence of CsOH·H_(2)O,respectively.The structures of the molecules were characterized by 1 H NMR,13 C NMR,MS,and elemental analyses.They showed negligible intramolecu-lar charge-transfer interaction in their ground states as indicated by their UV-Vis spectroscopics and cyclic voltammetry results.Compared with carbazole,their fluorescence was strongly quenched,which implied that a photo induced electron transfer(PET)interaction between TTF and carbazole moieties occurred.
