X-ray diffraction （XRD） was used to study the structure of the organic crystallite unit （La, Lo doo2） in coals collected from Henan and Shanxi Provinces. XRD patterns of coal were collected in a step-scan mode （0...X-ray diffraction （XRD） was used to study the structure of the organic crystallite unit （La, Lo doo2） in coals collected from Henan and Shanxi Provinces. XRD patterns of coal were collected in a step-scan mode （0.1 °/step） over an angular range of 2-90° （20）, allowing 8 s at each step. The structure of the crystallite unit was determined from the Scherrer equation and peak parameters deduced from whole pattern fitting. The results show that the structure of the crystallite unit in coal is mainly controlled by the coal rank. As the coal rank increases the average diameter of a coal crystallite unit （La） increases, the interlayer spacing （doo2） decreases slightly, and the average height of a coal crystallite unit （Lc） increases at first but then decreases. A new diffraction peak from the crystallite unit in coal was found at a low scattering angle in the XRD pattern （2-10~）. This suggests a structure with an inter-layer spacing from 1.9 to 2.8 nm exists in coal crystallites.展开更多
探讨马蔺纤维的性能。从马蔺叶中提取纤维素纤维,观察了马蔺纤维的外观形态,并测试了马蔺束纤维的长度、细度、回潮率、强伸性能、摩擦因数、染色性能。对比了水煮脱胶和碱煮脱胶制得的马蔺纤维的X射线衍射图谱和热重分析图。试验结果表...探讨马蔺纤维的性能。从马蔺叶中提取纤维素纤维,观察了马蔺纤维的外观形态,并测试了马蔺束纤维的长度、细度、回潮率、强伸性能、摩擦因数、染色性能。对比了水煮脱胶和碱煮脱胶制得的马蔺纤维的X射线衍射图谱和热重分析图。试验结果表明:马蔺纤维平均长度100 mm^300 mm,细度80 dtex,断裂强力100 c N^300 c N,断裂伸长率1%~2%,回潮率10.24%,动摩擦因数较棉略小,活性染料上染率较低;水煮脱胶得到的马蔺纤维属于纤维素Ⅰ晶型,残胶量较大;碱煮脱胶得到的马蔺纤维属于纤维素Ⅱ晶型,残胶量相对较小。认为:应通过进一步改善马蔺纤维脱胶方法,提高马蔺纤维性能,使其可应用于纺织和复合材料领域。展开更多
基金supported in part by Program for New Century Excellent Talents in University of China (No. NCET-10-0133)Innovation Scientists and Technicians Troop Construction Projects of Henan Province (No. 114100510004)
文摘X-ray diffraction （XRD） was used to study the structure of the organic crystallite unit （La, Lo doo2） in coals collected from Henan and Shanxi Provinces. XRD patterns of coal were collected in a step-scan mode （0.1 °/step） over an angular range of 2-90° （20）, allowing 8 s at each step. The structure of the crystallite unit was determined from the Scherrer equation and peak parameters deduced from whole pattern fitting. The results show that the structure of the crystallite unit in coal is mainly controlled by the coal rank. As the coal rank increases the average diameter of a coal crystallite unit （La） increases, the interlayer spacing （doo2） decreases slightly, and the average height of a coal crystallite unit （Lc） increases at first but then decreases. A new diffraction peak from the crystallite unit in coal was found at a low scattering angle in the XRD pattern （2-10~）. This suggests a structure with an inter-layer spacing from 1.9 to 2.8 nm exists in coal crystallites.
文摘探讨马蔺纤维的性能。从马蔺叶中提取纤维素纤维,观察了马蔺纤维的外观形态,并测试了马蔺束纤维的长度、细度、回潮率、强伸性能、摩擦因数、染色性能。对比了水煮脱胶和碱煮脱胶制得的马蔺纤维的X射线衍射图谱和热重分析图。试验结果表明:马蔺纤维平均长度100 mm^300 mm,细度80 dtex,断裂强力100 c N^300 c N,断裂伸长率1%~2%,回潮率10.24%,动摩擦因数较棉略小,活性染料上染率较低;水煮脱胶得到的马蔺纤维属于纤维素Ⅰ晶型,残胶量较大;碱煮脱胶得到的马蔺纤维属于纤维素Ⅱ晶型,残胶量相对较小。认为:应通过进一步改善马蔺纤维脱胶方法,提高马蔺纤维性能,使其可应用于纺织和复合材料领域。
