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Measurement of stability and size of colloidal particles in aqueous suspension
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
2019 (English)Student paper other, 5 HE creditsStudent thesis
Abstract [en]

This project focused on the study of self-assembling systems that can be inuenced by an external magnetic field, following the PhD research of Hauke Carstensen.

My role was to study the behavior of beads and to optimize the tunable parameters so that the main force driving the dynamics of the system is the magnetic dipolar interaction between beads. To make sure that no other force plays an important role, we checked a number of things, the most problematic of which is flocculation in the colloid, which may happen if some beads get stuck to each other; to prevent them from aggregating we have to make sure that they have a large zeta potential, which will result in an electrically repulsive force between beads and will thus increase the stability of the colloid. We also have to make sure that other forces in the sample do not exceed the magnitude of magnetic forces between particles; examples of such forces can be the drag experienced while moving in the viscous ferrofluid, the gravity force or the random thermal movement of the molecules in the fluid. In order to study these efects, I measured the zeta potential of the magnetic and non-magnetic beads and later I added a surfactant compound (SDS) to our sample in order to increase said potential.

Place, publisher, year, edition, pages
2019. , p. 14
Series
FYSAST ; FYSPROJ1142
Keywords [en]
Self-assembling systems, colloid, zeta potential, SDS
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-394083OAI: oai:DiVA.org:uu-394083DiVA, id: diva2:1356884
Educational program
Master Programme in Physics
Supervisors
Examiners
Available from: 2019-10-09 Created: 2019-10-02 Last updated: 2019-10-09Bibliographically approved

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