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Application of small‐angle scattering to the study of graphite‐adsorbed hydrocarbons
Author(s) -
Gilbert E.,
Reynolds P.,
White J.
Publication year - 2000
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889800099866
Subject(s) - graphite , orthorhombic crystal system , adsorption , small angle x ray scattering , melting point , scattering , alkane , crystallography , diffraction , intensity (physics) , materials science , analytical chemistry (journal) , chemistry , crystal structure , hydrocarbon , optics , organic chemistry , physics
The structure of graphite‐adsorbed n ‐alkanes for 10 ≤ n ≤ 20 has been investigated by SAXS. Below the bulk melting point, T m , and for alkanes with even n , two distinct diffraction peaks are observed, one associated with the bulk and the other with the surface structure. For alkanes with odd n , only one peak is observed below T m ; above T m a significant reduction in intensity is found, indicating melting of the bulk, but a peak remains. The intensity at T m increases with n and correlates with previous pyknometric and calorimetric measurements. The surface‐adsorbed structure has a repeat corresponding to the orthorhombic spacing of the bulk alkane crystal.