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国家重点基础研究发展计划(2011CB606104)

作品数:3 被引量:9H指数:2
相关作者:田丰高学平王劼李秀宏李小芸更多>>
相关机构:山东大学中国科学院上海应用物理研究所更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
相关领域:理学机械工程化学工程更多>>

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Small angle X-ray scattering beamline at SSRF被引量:5
2015年
Beamline BL16B1 at Shanghai Synchrotron Radiation Facility(SSRF) is dedicated to studying the microstructure and dynamic processes of polymers, nanomaterials, mesoporous materials, colloids, liquid crystals,metal materials, etc. At present, SAXS, wide angle X-ray scattering(WAXS), simultaneous SAXS/WAXS,grazing incident SAXS, and anomalous SAXS techniques are available for end user to conduct diverse experiments at this beamline. The sample-to-detector distance is adjustable from 0.2 m to 5 m. The practicable q-range is 0.03–3.6 nm-1at incident X-ray of 10 ke V for conventional SAXS whilst a continuous q-region of0.06–33 nm-1can be achieved in simultaneous SAXS/WAXS mode. Time-resolved SAXS measurements in sub-second level was achieved by the beamline upgrating in 2013. This paper gives detailed descriptions about the status, performance and applications of the SAXS beamline.
田丰李秀宏王玉柱杨春明周平林金友曾建荣洪春霞滑文强李小芸缪夏然边风刚王劼
关键词:小角X射线散射光束线SAXSWAXSSSRF
WAXS/SAXS,SAXS二维全谱拟合研究PAN基炭纤维预氧化、炭化过程中微观结构演变(英文)被引量:4
2017年
利用广角(WAXD)和小角散射(SAXS)的方法,对PAN基炭纤维制备过程不同阶段纤维的微晶和微孔进行研究。WAXD结果表明,在炭化过程中,微晶尺寸变大,并沿着纤维轴方向取向。SAXS结果表明,制备过程过,新微孔进一步形成,微孔逐渐沿纤维轴排列,微孔的平均长度增大。基于传统分析方法,确立微孔为具有择优取向的圆柱状,其尺寸大小成log正态函数分布的散射模型,对二维散射图进行全谱拟合分析。将此方法运用于炭纤维,得出该模型可以准确描述微孔的相关特征。
李小芸田丰高学平边风刚李秀宏王劼
关键词:小角散射炭纤维
Quantitative evaluation of equatorial small-angle X-ray scattering for cylindrical fibers
2013年
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 the 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.
李小芸李秀宏杨春明滑文强赵镍缪夏然田丰王玉柱边风刚王劼
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