The Structure of Dodecanamide Monolayers Adsorbed on Graphite

Bhinde, Tej; Arnold, Thomas; Clarke, Stuart M.

doi:10.1007/978-3-642-13461-6_2

Cited by 4 publications

(10 citation statements)

References 27 publications

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“…We have recently reported the structure of dodecanamide (C 12 amide) adsorbed on graphite at submonolayer coverage determined by diffraction. 25 The structure was found to contain hydrogen-bonded dimers which assemble to form extended chains in the monolayer, consistent with the bulk crystal structure and also with the previous microscopy work. 23 Characteristics of the hydrogen bonds present in the layer were reported with a resolution greater than that obtainable by microscopy.…”

Section: Introductionsupporting

confidence: 87%

“…This appears to be so even though the two patterns are at different temperatures, suggesting minimal thermal expansion in the layer. Identical structures were also found to fit the X-ray and neutron data for dodecanamide (C 12 amide) …”

Section: Resultsmentioning

confidence: 75%

“…One sample, C 12 amide, was heated from 10 K until the melting point in the neutron experiments, and no structural changes were observed, as discussed previously …”

Section: Resultsmentioning

confidence: 99%

“…Identical structures were also found to fit the X-ray and neutron data for dodecanamide (C 12 amide). 25 The lowest angle reflections in the diffraction patterns, viz. (1,0) or (2,0), correspond to the relatively longest interplanar spacings (d-spacings) in the unit cell.…”

Section: Resultsmentioning

confidence: 99%

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Crystalline Structures of Alkylamide Monolayers Adsorbed on the Surface of Graphite

Bhinde¹,

Clarke²,

Phillips³

et al. 2010

Langmuir

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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 be in close agreement with those present in the bulk materials.

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Section: Introductionsupporting

confidence: 87%

Section: Resultsmentioning

confidence: 75%

“…One sample, C 12 amide, was heated from 10 K until the melting point in the neutron experiments, and no structural changes were observed, as discussed previously …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Crystalline Structures of Alkylamide Monolayers Adsorbed on the Surface of Graphite

Bhinde¹,

Clarke²,

Phillips³

et al. 2010

Langmuir

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“…Despite an extensive controversy over the contribution and predominance of different conformers proposed for the asphaltene molecular structure, there is a consensus on the presence of a variety of asphaltene molecular structures in the bitumen matrix varying from “continental” to “archipelago”. , A continental is an asphaltene structural motif with a single large core of highly condensed poly aromatic rings surrounded by dangling peripheral chains. Unlike continentals, archipelagoes do not have a uniform aromatic core.…”

Section: Resultsmentioning

confidence: 99%

Intermolecular Interactions of Isolated Bio-Oil Compounds and Their Effect on Bitumen Interfaces

Hung

Mousavi

Pahlavan

et al. 2017

ACS Sustainable Chem. Eng.

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Bio-oils derived from low-value or waste biomass have been shown to be useful as low-cost, sustainable additives to improve the adhesion or moisture resistance of bituminous asphalt binder. The chemical profile of bio-oil is complex, and identifying the most active compounds in the mixture and understanding how they work to modify bitumen properties is essential for synthesizing bio-based additives with desired characteristics and performance. Hexadecanamide and hexadecanoic acid, two surfactants prevalent in both animal-and plant-derived bio-oils, are notable candidates as active compounds responsible for altering the colloidal or interfacial properties of bitumen. In this study, pure forms of these surfactants were mixed into bitumen to examine their effects on binder composition and morphology. AFM and FTIR data show that the amide strongly separated from the mixture, much of it crystallizing at the exposed surface. The DFT-based studies indicate that selfassembly of amide molecules is energetically preferred to adsorption of amides to asphaltenes or wax crystals in bitumen. The acid seemed to mix in well but induced the growth of a unique morphology at the glass interface. However, in combination, the amide and acid improve each other's solubility without strongly interacting with each other. Other molecules in bio-oil may similarly work to improve the solubility of the total mixture and make it an effective surface-modifying additive.

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Adsorption of Unsaturated Amides on a Graphite Surface: trans-Unsaturated Amides

et al. 2011

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The Structure of Dodecanamide Monolayers Adsorbed on Graphite

Cited by 4 publications

References 27 publications

Crystalline Structures of Alkylamide Monolayers Adsorbed on the Surface of Graphite

Crystalline Structures of Alkylamide Monolayers Adsorbed on the Surface of Graphite

Intermolecular Interactions of Isolated Bio-Oil Compounds and Their Effect on Bitumen Interfaces

Adsorption of Unsaturated Amides on a Graphite Surface: trans-Unsaturated Amides

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