Quantitative evaluation of equatorial small-angle X-ray scattering for cylindrical fibers

doi:10.1088/1674-1056/22/4/046102

Abstract Elongated microvoids, internal fibrillar structure, and edge scattering from both surface refraction cause an equatorial streak in small angle X-ray scattering. A model for analyzing edge scattering of fibers is proposed. Simulation results indicate that the intensity of edge scattering from surface refraction of a cylindrical fiber is strong and makes an important contribution to the equatorial streak. Two factors influence edge scattering intensity. One is the sample-to-detector distance (D); edge scattering intensity increases with increasing D. The equatorial streak becomes weak when D is shortened. The other factor is the refraction index. Edge scattering intensity increases as the real component of the refraction index decreases. In experiment, weak or even no equatorial streaks were found for samples measured in a roughly index-matching fluid. Edge scattering can be eliminated or weakened, and it can be calculated by comparing the intensities of a cylindrical fiber when it is measured in air and in index-matching fluid. The simulation data are basically in agreement with the experimental data.

Keywords: fiber edge scattering small angle scattering equatorial streak

Received: 03 September 2012
Revised: 31 October 2012
Accepted manuscript online:

PACS:	61.05.cf	(X-ray scattering (including small-angle scattering))
	41.60.Ap	(Synchrotron radiation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50903089, 10979073, 11005143, and 10979006) and the National Basic Research Program of China (Grant Nos. 2010CB934501, 2011CB606104, and 2011CB605604).

Corresponding Authors: Wang Jie
E-mail: wangjie@sinap.ac.cn

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Li Xiao-Yun (李小芸), Li Xiu-Hong (李秀宏), Yang Chun-Ming (杨春明), Hua Wen-Qiang (滑文强), Zhao Nie (赵镍), Miao Xia-Ran (缪夏然), Tian Feng (田丰), Wang Yu-Zhu (王玉柱), Bian Feng-Gang (边风刚), Wang Jie (王劼) Quantitative evaluation of equatorial small-angle X-ray scattering for cylindrical fibers 2013 Chin. Phys. B 22 046102

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Quantitative evaluation of equatorial small-angle X-ray scattering for cylindrical fibers

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