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Comparative study of flocculation and adsorption behavior of Moringa peregrina and Moringa oleifera seed proteins for water treatment
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.ORCID iD: 0000-0002-5203-8057
Namibia University of Science and Technology.
Institut Laue - Langevin, France.ORCID iD: 0000-0002-7412-8571
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
(English)In: Article in journal (Refereed) Submitted
National Category
Earth and Related Environmental Sciences Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-362073OAI: oai:DiVA.org:uu-362073DiVA, id: diva2:1252139
Available from: 2018-09-30 Created: 2018-09-30 Last updated: 2018-10-17Bibliographically approved
In thesis
1. Structure formation at solid/liquid interfaces: Understanding self-assembly and environmental challenges
Open this publication in new window or tab >>Structure formation at solid/liquid interfaces: Understanding self-assembly and environmental challenges
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work described in the present dissertation has explored the structure of particles and molecules at solid/liquid interfaces, aiming to understand the physics of self-organizing systems and use this knowledge to address some environmental issues. Surface-sensitive neutron scattering techniques, such as reflectometry and grazing incidence small angle scattering, have been used as the primary tool to investigate structures in proximity to an interface. Some of the challenges in the interpretation of neutron scattering data are discussed, and new methods for analyzing the signal have been proposed.

It was shown that charged stabilized colloidal particles can self-assemble and form large areas (20 cm2) of crystalline structures, close to a smooth solid surface extending to depths of several micrometers, while orienting themselves into smaller crystallites in the bulk of the suspension. The adsorption of proteins from the seeds of different species of Moringa trees on alumina, silica and polystyrene surfaces was studied, as a means for using proteins from different sources and with different properties, for the water clarification step in the purification process. The seed proteins also showed to enable locking the structure of colloidal particles at the solid/liquid interface, acting as a molecular glue.

Perfluorinated surfactants (PFASs), widely used in industrial, pharmaceutical and food packing products, have been identified as emerging pollutants, raising a global concern for the environment and wildlife. The present study has shown how PFASs molecules of different fluorocarbon chain length and with different functional groups, create defects in model membranes by partitioning and removing phospholipids from the bilayer, making the bilayer thin and less dense.

The effect of interface roughness was studied on the lamellar structure of a non-ionic surfactant. Concentrated solutions of the surfactant have been shown to form well-ordered and well-aligned structures at a smooth interface, which could be modified further by simply heating the sample. However it was found that even small roughness, of the same order as the bilayer thickness, can distort the structure to a depth of several micrometers from the interface. Heating the sample could improve the alignment but not as much as that formed at a smooth surface.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 64
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1732
Keywords
Solid/liquid interface, neutron scattering, colloidal particles, self-assembly, perfluoroalkyl substance, Moringa seed proteins, adsorption, lamellar disorder, thermal fluctuations.
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-362075 (URN)978-91-513-0475-5 (ISBN)
Public defence
2018-12-14, Å80127, Ångströmlaboratoriet, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2018-11-19 Created: 2018-10-13 Last updated: 2018-11-30

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Nouhi, ShirinRennie, A. R.

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