Chemical Information of Chitosan-Based Complex Extracted from Coincidence Doppler Broadening Spectra
Xingzhong Caoa, Rui Xia a, Jing Yang b, Minfeng Zeng c, Baoyi Wang a, Runsheng Yu a and Long Wei a
aMulti-discipline Research Center, Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China
bDepartment of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China
cZhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, China
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In recent years, coincidence Doppler broadening (CDB) of annihilation radiation measurement on polymeric system has been attracting special attention because of its unique elemental sensitivities in comparison to the traditional Doppler broadening measurement. In the present study, chitosan-Fe3O4 nanocomposite (CS-Fe3O4) and copper-chitosan (Cu-CS) complexes were prepared through a simple casting method from aqueous solution. The inclusion of Fe3O4 nanoparticles in the chitosan matrix is confirmed by X-ray diffraction. In order to obtain data about atomic composition of the annihilation site in the CS composites, CDB measurements were carried out. The normalized CDB ratio curve, which is related to the ratio between the momentum density distribution for the studied samples and pure CS, was displayed to illustrate the variation of ion cores of different elements present in the chitosan matrix. Our result confirms a contribution of active group available in chitosan molecules to the features in the high-momentum region of the CDB ratio curve. The findings show that the local chemical environment of the annihilation site in chitosan-based complexes could be estimated by such positron annihilation spectroscopic investigation.

DOI: 10.12693/APhysPolA.132.1535
PACS numbers: 78.70.Bj,, 82.30.Gg