Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 356, Issue -, Pages 129-134Publisher
ELSEVIER
DOI: 10.1016/j.nimb.2015.04.075
Keywords
Ion irradiation; High density polyethylene (HDPE); Small-angle X-ray scattering (SAXS); Ion track
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Funding
- National Basic Research Program of China [2010CB832903]
- National Natural Science Foundation of China [10675157, 10875161, 11175235]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA02030200]
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Semi-crystalline high density polyethylene (HDPE) samples were irradiated with 1.157 GeV Fe-56 ion beams to fluences ranging from 1 x 10(11) to 6 x 10(12) ions/cm(2). The radiation induced changes in nano/microstructure were investigated with small angle X-ray scattering (SAXS) technique. The scattering contributions from HDPE matrix and ion tracks are successfully separated and analyzed through tilted SAXS measurements with respect to the X-ray beam direction. Lorentz correction, one-dimensional correlation function calculation, fractal nature analysis of the isotropic scattering pattern reveal that HDPE long period polymeric structures are damaged and new materials, possibly clusters of carbon-rich materials, are formed inside the ion tracks. Least square curve fitting of the scattering contribution from the ion track reveals that the track is composed of a core of about 5.3 nm in radius, characterized by a significant density deficit compared to the virgin HDPE, surrounded by a shell of about 4.3 nm in thickness with less density reduction. (C) 2015 Elsevier B.V. All rights reserved.
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