Positron Annihilation Mechanism Correlated with Microstructure of C60 -Contained Chitosan
DAI Yi-Qun1 , HE Chun-Qing1 , LI Shi-Qing1 , FANG Peng-Fei2 , CHEN Yuan-Yin2 , WANG Shao-Jie1
1 Department of Physics, 2 Department of Chemistry, Wuhan University, Wuhan 430072
Positron Annihilation Mechanism Correlated with Microstructure of C60 -Contained Chitosan
DAI Yi-Qun1 ;HE Chun-Qing1 ;LI Shi-Qing1 ;FANG Peng-Fei2 ;CHEN Yuan-Yin2 ;WANG Shao-Jie1
1 Department of Physics, 2 Department of Chemistry, Wuhan University, Wuhan 430072
关键词 :
78.70.Bj ,
61.41.+e
Abstract : Positron annihilation lifetime spectra measurements were performed on C60 -containing chitosan as a function of temperature ranging from 290 to 380K. Both the ortho-positronium annihilation lifetime т3 and its intensity I3 increase with increasing temperature, however, the values of I3 in C60 -containing chitosan are smaller than that in pure chitosan, and the slope of т3 with temperature is also suppressed after C60 linked. The existing three models for positron annihilation in polymer have been compared to analyze the experiment result. It is realized that only the spur reaction model, combined with the free volume model, can explain it satisfactorily. The ortho-positronium lifetime and intensity were affected by the local physicochemical environment of material, i.e., free-volume structure, electron scavenging and trapping sites, etc. The linked C60 that play a significant chemical inhibition and quenching role on positronium formation and annihilation is first observed. The microstructure change brought by C60 group has also been discussed.
Key words :
78.70.Bj
61.41.+e
出版日期: 2000-06-01
:
78.70.Bj
(Positron annihilation)
61.41.+e
(Polymers, elastomers, and plastics)
引用本文:
DAI Yi-Qun;HE Chun-Qing;LI Shi-Qing;FANG Peng-Fei;CHEN Yuan-Yin;WANG Shao-Jie. Positron Annihilation Mechanism Correlated with Microstructure of C60 -Contained Chitosan[J]. 中国物理快报, 2000, 17(6): 457-459.
DAI Yi-Qun, HE Chun-Qing, LI Shi-Qing, FANG Peng-Fei, CHEN Yuan-Yin, WANG Shao-Jie. Positron Annihilation Mechanism Correlated with Microstructure of C60 -Contained Chitosan. Chin. Phys. Lett., 2000, 17(6): 457-459.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2000/V17/I6/457
[1]
ZHANG Li-Juan;WANG Hua-Bin;. Investigation of the Elasticity of Polymer Nanoparticle by Vibrating Scanning Polarization Force Microscopy [J]. 中国物理快报, 2006, 23(8): 2315-2318.
[2]
CHEN Zhi-Quan;M. Maekawa;A. Kawasuso. Energy Variable Slow Positron Beam Study of Li+ -Implantation-Induced Defects in ZnO [J]. 中国物理快报, 2006, 23(3): 675-677.
[3]
PENG Cheng-Xiao;WENG Hui-Min;YANG Xiao-Jie;YE Bang-Jiao;CHENG Bin;ZHOU Xian-Yi;HAN Rong-Dian. Dependence of Intrinsic Defects in ZnO Films on Oxygen Fraction Studied by Positron Annihilation [J]. 中国物理快报, 2006, 23(2): 489-492.
[4]
HU Yi-Fan;SUN Jia-Ning;D. W. Gidley. Nanoporous Structure in Low-Dielectric Films with Positronium Annihilation Lifetime Spectroscopy [J]. 中国物理快报, 2005, 22(6): 1488-1491.
[5]
HU Yi-Fan;C. D. Beling;S. Fung. Variable Energy Positron Annihilation Spectroscopy of GaN Grown on Sapphire Substrates with MOCVD [J]. 中国物理快报, 2005, 22(5): 1214-1217.
[6]
HU Yi-Fan;SUN Jia-Ning;Gidley D.W.. Probing Cu Diffusion Barrier Layers on Porous Low-Dielectric-Constant Films by Posireonium Annihilation Lifetime Spectroscopy [J]. 中国物理快报, 2005, 22(11): 2906-2909.
[7]
XU Yong-Jun;FAN Zhi-Guo;LUO Qi;WANG Rong;ZHU Jia-Zheng;T. Iwata;T. Minamisono;K. Matsuta;M. Fukuda;M. Mihara;ZHU Sheng-Yun. Void Evolution in α-Al2 O3 Irradiated by En ≥1 MeV Neutrons of 3 x 1020 cm-2 [J]. 中国物理快报, 2001, 18(6): 808-809.
[8]
MAO Wei-Dong;WANG Shao-Jie;WANG Zhu;SUN Nie-Feng;SUN Tong-Nian;ZHAO You-Wen. Identification of Defects in Undoped Semi-insulating InP
by Positron Lifetime [J]. 中国物理快报, 2001, 18(4): 574-576.
[9]
HE Chun-Qing;DAI Yi-Qun;WANG Bo;WANG Shao-Jie;WANG Gui-You;HU Chun-Pu
. Temperature Dependence of Free Volume in Cross-linked Polyurethane Studied by Positrons
[J]. 中国物理快报, 2001, 18(1): 123-125.
[10]
WE Long;WANG Yun-Bo;WANG Hui-Yao;YUE Yong;WANG Tian-Min;ZHANG Tian-Bao;CAO Guo-Hui;. Influence of Fe in the local Structure of Perovskite Compound La2/3 Cal/3 Fel-x Mnx O3 [J]. 中国物理快报, 2000, 17(6): 446-447.
[11]
ZHU Jun;MA Li;WANG Shao-Jie;LUO Xi-Hui. Reaction of Positronium with Proton in Ultra-stable Y Zeolite Studied by Positrons [J]. 中国物理快报, 2000, 17(2): 134-136.
[12]
WANG Zhu;WANG Shao-Jie;CHEN Zhi-Quan. Observation of As-Grown Defects in Zn-Doped GaAs by Positron Lifetime Spectra [J]. 中国物理快报, 2000, 17(11): 841-843.
[13]
CHEN Zhi-quan;WANG Zhu;WANG Shao-jie. Interaction Between Dopants and Native Defects in Zn Doped p-InP Observed by Positron Annihilation [J]. 中国物理快报, 1999, 16(8): 586-588.
[14]
JI Yuan;CAO Guo-hui;;LI Yang;MA Qing-zhu;LI Shen;WANG Yun-bo;SHEN Bao-gen. Positron Annihilation Studies in the Sm2/3 Sr1/3 MnO3+δ [J]. 中国物理快报, 1998, 15(3): 226-227.
[15]
XU Jing-jun;FANG Qi-yin;MA Chao-li;ZHANG Guang-yin;SUN Qian;ZHANG Guo-quan;LIU Si-min;TIAN Guo-yun;WU Qiang;CHEN Xiao-bo
. Light Amplification in Non-photorefractive Doped Polymer Film at Red Light Wavelength [J]. 中国物理快报, 1997, 14(3): 179-182.