In this paper,the HRTEM lattice fringe micrograph of Caocun No.2 coal was extracted by ArcGIS,the length and orientation of the fringes were calculated,and the rose diagram for the lattice fringe micrograph was drawn ...In this paper,the HRTEM lattice fringe micrograph of Caocun No.2 coal was extracted by ArcGIS,the length and orientation of the fringes were calculated,and the rose diagram for the lattice fringe micrograph was drawn by Matlab.By controlling the segmentation points of each lattice fringe,the coordinates of the segmentation points were processed by a self-programmed Python program,and then a series of curvature characterizations including segmentation angle,cumulative angle and tortuosity were performed for lattice fringes with different lengths.The results show that Caocun No.2 coal is mainly composed of short naphthalene fringes.Lattice fringes with the length ranging from 0.3 nm to 1.14 nm account for more than 90%of the total number of fringes,and the number of polynuclear aromatic rings was 2-4.The direction of lattice fringes is concentrated between 110°and 120°,which indicates well structural orientation of lattice fringes.The number of segment angles ranging from 0°to 20°account for about half of the total,which reflects the structural orientation further.For fringes with the length ranging from 0.3 nm to 1.14 nm,the cumulative angles are mainly concentrated at 4°to 160°.Fringes with the tortuosity in the range of 1.0-1.1 are more than 92%of the total number of fringes.In addition,short fringes have large curvature,which shows significant effects on the placement and frequency of non-six-membered rings and lattice imperfection in the aromatic structure.展开更多
基金Supported by the National Natural Science Foundation of China(41602177,41802191,41702175)
文摘In this paper,the HRTEM lattice fringe micrograph of Caocun No.2 coal was extracted by ArcGIS,the length and orientation of the fringes were calculated,and the rose diagram for the lattice fringe micrograph was drawn by Matlab.By controlling the segmentation points of each lattice fringe,the coordinates of the segmentation points were processed by a self-programmed Python program,and then a series of curvature characterizations including segmentation angle,cumulative angle and tortuosity were performed for lattice fringes with different lengths.The results show that Caocun No.2 coal is mainly composed of short naphthalene fringes.Lattice fringes with the length ranging from 0.3 nm to 1.14 nm account for more than 90%of the total number of fringes,and the number of polynuclear aromatic rings was 2-4.The direction of lattice fringes is concentrated between 110°and 120°,which indicates well structural orientation of lattice fringes.The number of segment angles ranging from 0°to 20°account for about half of the total,which reflects the structural orientation further.For fringes with the length ranging from 0.3 nm to 1.14 nm,the cumulative angles are mainly concentrated at 4°to 160°.Fringes with the tortuosity in the range of 1.0-1.1 are more than 92%of the total number of fringes.In addition,short fringes have large curvature,which shows significant effects on the placement and frequency of non-six-membered rings and lattice imperfection in the aromatic structure.
