期刊
JOURNAL OF SYNCHROTRON RADIATION
卷 20, 期 -, 页码 741-748出版社
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0909049513017871
关键词
electrospun nano-Bi2O3/PLA nanofibre mat; electrospun micro-Bi2O3/PLA nanofibre mat; nano-Bi2O3/PLA thin films; micro-Bi2O3/PLA thin films; X-ray attenuation; porosity
The characteristics of the X-ray attenuation in electrospun nano(n)- and micro(m)-Bi2O3/polylactic acid (PLA) nanofibre mats with different Bi2O3 loadings were compared as a function of energy using mammography (i.e. tube voltages of 22-49 kV) and X-ray absorption spectroscopy (XAS) (7-20 keV). Results indicate that X-ray attenuation by electrospun n-Bi2O3/PLA nanofibre mats is distinctly higher than that of m-Bi2O3/PLA nanofibre mats at all energies investigated. In addition, with increasing filler loading (n-Bi2O3 or m-Bi2O3), the porosity of the nanofibre mats decreased, thus increasing the X-ray attenuation, except for the sample containing 38 wt% Bi2O3 (the highest loading in the present study). The latter showed higher porosity, with some beads formed, thus resulting in a sudden decrease in the X-ray attenuation.
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