Dynamics and Structure of a Bitumen Emulsion as Studied by 1 H NMR Diffusometry.
| Autor: | Filippov A; Chemistry of Interfaces, Department of Civil and Environmental Engineering, Luleå University of Technology, Luleå SE-97187, Sweden., Soenen H; Nynas N.V., 171 Groenenborgerlaan, Antwerp 2020, Belgium., Blom J; Faculty of Applied Engineering, EMIB-Research Group, University of Antwerp, 171 Groenenborgerlaan, Antwerp 2020, Belgium., Antzutkin ON; Chemistry of Interfaces, Department of Civil and Environmental Engineering, Luleå University of Technology, Luleå SE-97187, Sweden. |
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| Jazyk: | angličtina |
| Zdroj: | ACS omega [ACS Omega] 2023 Sep 21; Vol. 8 (39), pp. 36534-36542. Date of Electronic Publication: 2023 Sep 21 (Print Publication: 2023). |
| DOI: | 10.1021/acsomega.3c05492 |
| Abstrakt: | Self-diffusion in a bitumen emulsion was studied by 1 H NMR. The emulsion forms two phases: continuous and dispersed. The continuous aqueous phase contains mainly water, with the energy of activation of the diffusion process equal to that of bulk water, while its diffusivity is smaller than that of bulk water by a factor of 2. The dispersed phase consists of bitumen droplets containing confined water, whose dynamics is characterized by a fully restricted diffusion regime in cavities with sizes of ∼0.11 μm. Therefore, the studied bitumen emulsion can be described by a model of a complex multiple emulsion of the water/oil/water (WOW) type. The suggested model does agree well with data from 1 H NMR spectroscopy and diffusometry of the bitumen emulsion doped with paramagnetic MnSO Competing Interests: The authors declare no competing financial interest. (© 2023 The Authors. Published by American Chemical Society.) |
| Databáze: | MEDLINE |
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