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Instruments / Technical Area	Publication Details	Published
I11-High Resolution Powder Diffraction	Adsorption of Unsaturated Amides on a Graphite Surface: trans-Unsaturated Amides Tej Bhinde , Adam Brewer , Stuart Clarke , Tamsin Phillips , Tom Arnold , Julia Parker Journal Of Physical Chemistry C 115 (14) DOI: 10.1021/jp1121257 Show Abstract ▼ Abstract: The adsorption of three unsaturated amides on graphite is investigated using a combination of synchrotron X-ray diffraction and differential scanning calorimetry (DSC). In this work unsaturated amides with chain lengths of six and nine carbons have been studied with one trans double bond in the alkyl chain at different positions. The structure of each unsaturated amide has been separately determined using synchrotron X-ray diffraction at submonolayer coverages. These monolayer structures are compared with the structure of the saturated amide of the same chain length. The hydrogen bond geometries in these structures are discussed, and these indicate that the position of the double bond relative to the amide headgroup has an important influence on the stability of the monolayer, a finding also supported by the DSC results. Binary mixtures of saturated and trans-unsaturated amides have also been studied using DSC and the behavior discussed using the monolayer structures of the individual species.	Mar 2011
	Phase Behavior of Heptanamide Adsorbed on a Graphite Substrate Tej Bhinde , Tamsin Phillips , Stuart Clarke , Tom Arnold , Julia Parker Langmuir 27 (1), 15-18 DOI: 10.1021/la1041053 Show Abstract ▼ Abstract: In this letter, the phase behavior of a saturated alkylamide, heptanamide (C7), adsorbed on the surface of graphite using synchrotron X-ray diffraction is presented. The diffraction patterns indicate that heptanamide undergoes a solid−solid phase transition in the monolayer at 330 K from pgg symmetry at lower temperatures to p2 symmetry at high temperatures. Other alkylamides with similar carbon chain lengths do not show this phase change, making the C7 homologue unusual.	Jan 2011
I11-High Resolution Powder Diffraction	Adsorption of aldehydes on a graphite substrate: Combined thermodynamic study of C6-C13 homologues with a structural and dynamical study of dodecanal Tamsin Phillips , Tej Bhinde , Stuart Clarke , Seung Lee Journal Of Physical Chemistry C 114 (13), 6027-6034 DOI: 10.1021/jp911069t Diamond Proposal Number(s): [3532] Show Abstract ▼ Abstract: In this work we present a study on the adsorption of linear alkyl aldehydes physisorbed from their bulk liquid onto a graphite substrate combining calorimetry for all homologues from C6 to C13, with more detailed diffraction, incoherent neutron scattering, and scanning tunneling microscopy techniques for one (C12) representative member. We identify solid monolayer formation for some of these species for alkyl chain lengths of 6 to 13 carbons at high surface coverages. The C12 monolayer structure is determined to be most likely Pgg and this structure is discussed in terms of the importance of dipolar interactions.	Mar 2010
I11-High Resolution Powder Diffraction	Crystalline Structures of Alkylamide Monolayers Adsorbed on the Surface of Graphite Tej Bhinde , Stuart Clarke , Tamsin Phillips , Tom Arnold , Julia Parker Langmuir 26 (11) DOI: 10.1021/la904587u PMID: 20095530 Show Abstract ▼ Abstract: Synchrotron X-ray and neutron diffraction have been used to determine the two-dimensional crystalline structures of alkylamides adsorbed on graphite at submonolayer coverage. The calculated structures show that the plane of the carbon backbone of the amide molecules is parallel to the graphite substrate. The molecules form hydrogen-bonded dimers, and adjacent dimers form additional hydrogen bonds yielding extended chains. By presenting data from a number of members of the homologous series, we have identified that these chains pack in different arrangements depending on the number of carbons in the amide molecule. The amide monolayers are found to be very stable relative to other closely related alkyl species, a feature which is attributed to the extensive hydrogen bonding present in these systems. The characteristics of the hydrogen bonds have been determined and are found to he in close agreement with those present in the bulk materials.	Jan 2010

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