Electron Microscope Studies of Organic Pigments

[摘要] Organic Pigments form a large and commercially important group of materials. Crystal structure analysis of these compounds has, in general, been hampered by the small crystallite size exhibited by these materials, which precludes the use of standard single crystal x-ray diffraction techniques. The results of using an electron microscope for the crystallographic analysis of an organic pigment provides one aspect of the work recorded in this thesis. Electron microscope studies of organic crystals suffer a major, resolution limiting factor in the susceptibility of the crystals to damage on exposure to the electron beam. Computer processing of electron microscope images of organic pigments has been applied to overcome the radiation damage problem. The installation of an image processing system and the results obtained from this are described. An organic pigment, Pigment Red 57, exhibits a colour shade change, brought about by a crystallographic change, on altering the crystal water content. One of the main aims of the project was to provide an interpretation for this shade variation.

[发布机构] University:University of Glasgow

[关键词] Organic chemistry