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Probing sub-nano level molecular packing and correlated positron annihilation characteristics of ionic cross-linked chitosan membranes using positron annihilation spectroscopy
Xia, R; Cao, XZ; Gao, MZ; Zhang, P; Zeng, MF; Wang, BY; Wei, L; Cao XZ(曹兴忠); Zhang P(张鹏); Wang BY(王宝义); Wei L(魏龙)
2017
Source PublicationPHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN1463-9076
EISSN1463-9084
Volume19Issue:5Pages:3616-3626
SubtypeArticle
AbstractChitosan, CS, cross-linked with bivalent palladium has shown enhanced mechanical and thermal properties depending on the transformation of the structure at a microscopic scale. In the present study, CS directly cross-linked by palladium cation membranes (CS-cr-PM) was prepared through a solution-casting method. Mobility of chitosan chains were greatly reduced after crosslinking, making a great reduction in the swelling ratio studied by a water-swelling degree measurement, which led to an improvement in molecular chain rigidity. In order to investigate the chain packing at the molecular level in the ionic cross-linked CS system, the structure of chemically-crosslinked CS is investigated by means of the combined use of wide angle X-ray diffraction (WAXD) and infrared measurements, and a combination of positron annihilation lifetime spectroscopy (PALS) and simultaneous coincidence Doppler broadening (CDB) spectroscopy offers coherent information on both the free-volume related sub-nano level molecular packing and the chemical surrounding of free volume nanoholes in CS-cr-PM as a function of palladium salt loading. The variations in the free volume size and size distribution have been determined through the ortho-positronium (o-Ps) lifetime and its lifetime distribution. The studies showed that a strong interaction between CS molecules and palladium cations results in the change in crystallinity in formed CS-cr-PM leading to variational chain packing density. Meanwhile, significant inhibition effects on positronium formation due to doping are observed, which could be interpreted in terms of the existence of chloride ions. Applications of positron annihilation spectroscopy to study the microstructure and correlated positron annihilation characteristics of an ionic cross-linked CS system are systematically discussed.
DOI10.1039/c6cp07434k
WOS KeywordDOPPLER-BROADENING SPECTROSCOPY ; FREE-VOLUME ; NANOCOMPOSITES ; LIFETIME ; TRANSPORT ; CATALYST ; FILMS ; PMMA
Indexed BySCI ; ADS ; PUBMED ; SCOPUS
Language英语
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS IDWOS:000395328100021
ADS Bibcode2017PCCP...19.3616X
ADS URLhttps://ui.adsabs.harvard.edu/abs/2017PCCP...19.3616X
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2017PCCP...19.3616X/citations
Citation statistics
Cited Times:13 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285128
Collection多学科研究中心
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Xia, R,Cao, XZ,Gao, MZ,et al. Probing sub-nano level molecular packing and correlated positron annihilation characteristics of ionic cross-linked chitosan membranes using positron annihilation spectroscopy[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2017,19(5):3616-3626.
APA Xia, R.,Cao, XZ.,Gao, MZ.,Zhang, P.,Zeng, MF.,...&魏龙.(2017).Probing sub-nano level molecular packing and correlated positron annihilation characteristics of ionic cross-linked chitosan membranes using positron annihilation spectroscopy.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,19(5),3616-3626.
MLA Xia, R,et al."Probing sub-nano level molecular packing and correlated positron annihilation characteristics of ionic cross-linked chitosan membranes using positron annihilation spectroscopy".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19.5(2017):3616-3626.
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