sc7b01462_si_001.pdf (1.36 MB)
Intermolecular Interactions of Isolated Bio-Oil Compounds and Their Effect on Bitumen Interfaces
journal contribution
posted on 2017-07-28, 00:00 authored by Albert
M. Hung, Masoumeh Mousavi, Farideh Pahlavan, Ellie H. FiniBio-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 self-assembly
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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Isolated Bio-Oil Compoundswaste biomasssurfactantsynthesizing bio-based additivesbitumen propertiesmixturemoisture resistancemorphologyplant-derived bio-oilschemical profilewax crystalsamide moleculesAFMIntermolecular InteractionsFTIR data showsolubilitysurface-modifying additivecompoundasphalt binderglass interfacehexadecanoic acidBitumen Interfaces Bio-oilsOther moleculesbinder compositionDFT-based studies
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