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Dorset DL. Electron crystallography of the polymethylene chain. 5. Three-dimensional structure of a Fischer-Tropsch wax. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zkri.216.4.234.23258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The crystal structure of a Fischer-Tropsch wax, Shell Callista 158, has bee determined in three dimensions from electron diffractio intensity data. Although there is an orthorhombic layer arrangement with apparent dimensions, a = 7.42, b = 4.96, c = 94.50 Å, true lamellae cannot form, due to a ‘nematocrystalline’ arrangement of very long chain components,generating a continuous chain direction through adjacent chain layer clusters. The structure is actually a superlattice of the Pnam cell observed for high molecular weight polyethylene.
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Electron crystallography of organic materials. Ultramicroscopy 2006; 107:453-61. [PMID: 17240070 DOI: 10.1016/j.ultramic.2006.03.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2005] [Accepted: 03/09/2006] [Indexed: 11/30/2022]
Abstract
The application of electron crystallography to the study of organic materials is reviewed, mainly in context of the author's own experience. Direct methods for crystallographic phase determination have been shown to be very effective for ab initio structure analyses with electron diffraction intensities, permitting the elucidation of previously uncharacterized crystal structures. Fruitful applications areas have included chain-folded linear polymers, pigments, polydisperse linear chain arrays and, surprisingly, the subgroup assembly of certain proteins.
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Luo C, Guardala NA, Price JL, Chodak I, Zimerman O, Weiss RG. Structural and Dynamic Investigations of Unstretched and Stretched Ultrahigh Molecular Weight Polyethylene Films. 1-Pyrenyl Attachment by Bombardment with 4.5 MeV Protons and Irradiation with eV Range Photons. Macromolecules 2002. [DOI: 10.1021/ma020235q] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chuping Luo
- Department of Chemistry, Georgetown University, Washington, D.C., 20057-1227; Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817; and Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic
| | - Noel A. Guardala
- Department of Chemistry, Georgetown University, Washington, D.C., 20057-1227; Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817; and Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic
| | - Jack L. Price
- Department of Chemistry, Georgetown University, Washington, D.C., 20057-1227; Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817; and Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic
| | - Ivan Chodak
- Department of Chemistry, Georgetown University, Washington, D.C., 20057-1227; Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817; and Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic
| | - Oscar Zimerman
- Department of Chemistry, Georgetown University, Washington, D.C., 20057-1227; Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817; and Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic
| | - Richard G. Weiss
- Department of Chemistry, Georgetown University, Washington, D.C., 20057-1227; Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, Maryland 20817; and Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic
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Rademeyer M, Dorset DL. Crystal Structure of Wax Lamellar InterfacesA Residual Petroleum Fraction Characterized by Electron Crystallography. J Phys Chem B 2001. [DOI: 10.1021/jp004233o] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Melanie Rademeyer
- Department of Chemistry and Biochemistry, Rand Afrikaans University, P.O. Box 524, Auckland Park 2006, South Africa
| | - Douglas L. Dorset
- Electron Crystallography Laboratory, Hauptman-Woodward Medical Research Institute, Inc., 73 High Street, Buffalo, New York 14203-1196
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