Please use this identifier to cite or link to this item: https://nbn-resolving.org/urn:nbn:de:hbz:467-1452
Files in This Item:
File Description SizeFormat
bonaccurso.pdf2,59 MBAdobe PDFThumbnail
View/Open
Dokument Type: Doctoral Thesis
Title: Investigation of electrokinetic forces on single particles
Authors: Bonaccurso, Elmar 
Institute: Fachbereich 8, Chemie - Biologie 
Free keywords: hydrodynamics, electrokinetics, colloidal probe technique
Dewey Decimal Classification: 540 Chemie
GHBS-Clases: UZS
Issue Date: 2001
Publish Date: 2006
Abstract: 
This work shows that in many aspects of colloidal systems there exists a coupling between hydrodynamic and electrostatic interactions. For charged particles immersed in a polar medium, there is a pronounced influence of the electric field upon the motion of the particle in the fluid. Experimentally, this leads to electrokinetic effects , which may influence the coagulation of colloid particles and their adsorption at surfaces. These effects can be
described by extending the equations of motion by an additional electrostatic term.
This work also gives evidence of the existence of the hydrodynamic phenomenon of slip between hydrophilic bodies in an aqueous medium. Recently, more general boundary conditions, differing from the no-slip boundary condition , have been proposed. Due to the experiments presented here, the more general boundary conditions have to be considered only for shear stresses, which the liquid experiences in the vicinity of the solid interfaces.
In order to carry out these measurements using the colloidal probe technique , new types of rectangular tipless cantilevers have been designed and fabricated. These have the advantage, with respect to commercial triangular cantilevers, of affecting less the hydrodynamics of the microsphere in vicinity of the flat surface. These home made cantilevers have also a higher sensitivity in the specific range of forces of our interest (0.1 ÷ 10 nN).
URN: urn:nbn:de:hbz:467-1452
urn:nbn:de:hbz:467-1452
URI: https://dspace.ub.uni-siegen.de/handle/ubsi/145
License: https://dspace.ub.uni-siegen.de/static/license.txt
Appears in Collections:Hochschulschriften

This item is protected by original copyright

Show full item record

Page view(s)

95
checked on Oct 25, 2020

Download(s)

15
checked on Oct 25, 2020

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.