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Adsorption characteristics of brush polyelectrolytes on silicon oxynitride revealed by dual polarisation interferometry
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
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2010 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 348, 189-197 p.Article in journal (Refereed) Published
Abstract [en]

Adsorption properties of bottle-brush polyelectrolytes have been investigated using dual polarization interferometry (DPI), which provides real time monitoring of adsorbed layer thickness and refractive index. The adsorption on silicon oxynitride was carried out from aqueous solution with no added inorganic salt, and the adsorbed polyelectrolyte layer was subsequently rinsed with NaCl solutions of increasing concentration. The bottle-brush polyelectrolytes investigated in this study have different ratios of permanent cationic charged segments and uncharged PEO side chains. Both the cationic groups and the PEO side chains have affinity for silica-like surfaces, and thus contribute to the adsorption process that becomes rather complex. Adsorption properties in water, responses to changes in ionic strength of the surrounding medium, adsorption kinetics and the layer structure are all strongly dependent on the ratio between backbone charges and side chains. The results are interpreted in terms of competitive adsorption of segments with different chemical nature. The adsorption kinetics is relatively fast, taking only tens to hundreds of seconds when adsorbed from dilute 100 ppm solutions. The DPI technique was found to be suitable for studying such rapid adsorption processes, including determination of the initial adsorption kinetics. We expect that the effects observed in this study are of general importance for synthetic and biological polymers carrying segments of different nature.

Place, publisher, year, edition, pages
2010. Vol. 348, 189-197 p.
Keyword [en]
Bottle-brush polyelectrolyte, Dual polarization interferometry, Adsorption, Desorption, Adsorption mechanism, Adsorption kinetics, Silicon oxynitride
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-12951DOI: 10.1016/j.jcis.2010.03.067ISI: 000278924600024PubMedID: 20403606Scopus ID: 2-s2.0-77953620714OAI: oai:DiVA.org:kth-12951DiVA: diva2:319829
Note
QC 20100520Available from: 2010-05-20 Created: 2010-05-20 Last updated: 2011-05-16Bibliographically approved
In thesis
1. Interfacial properties of bottle-brush polyelectrolytes and lipids
Open this publication in new window or tab >>Interfacial properties of bottle-brush polyelectrolytes and lipids
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2010:21
Identifiers
urn:nbn:se:kth:diva-12953 (URN)978-91-7415-658-4 (ISBN)
Presentation
2010-06-04, 10:00 (English)
Opponent
Supervisors
Note
QC 20100520Available from: 2010-05-20 Created: 2010-05-20 Last updated: 2012-03-19Bibliographically approved
2. Polyelectrolyte complexes of bottle brush copolymers: Solution and adsorption properties
Open this publication in new window or tab >>Polyelectrolyte complexes of bottle brush copolymers: Solution and adsorption properties
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this thesis work was to systematically investigate the physico-chemical properties of polyelectrolyte complexes (PECs) formed by bottle brush and linear polyelectrolytes in solution and at solid / liquid interfaces. Electrostatic self-assembly of oppositely charged macromolecules in aqueous solution is a versatile strategy to construction of functional nanostructures with easily controlled properties. Bottle brush architecture, introduced into the PEC, generates a number of distinctive properties of the complexes, related to a broad range of application, such as colloidal stability and protein repellency to name a few. To utilize these materials in a wide range of applications e.g. drug delivery, the understanding of the effects of polymer architecture and solution parameters on the properties of bottle brush PECs is of paramount importance. This thesis constitutes a systematic investigation of PECs formed by a series of cationic bottle-brush polyelectrolytes and a series of anionic linear polyelectrolytes in aqueous solution. The focus of the first part of the thesis was primarily on formation and characterization of PECs in solution, whereas the adsorption properties and adsorption kinetics of bottle-brush polyelectrolytes and their complexes was investigated in the second part of the thesis work. In particular, effects of the side-chain density of the bottlebrush polyelectrolyte, concentration, mixing ratio and molecular weigh of the linearpolyelectrolyte on formation, solution properties, stability and adsorption of PECs were addressed.

The pronounced effect of the side-chain density of the bottle-brush polyelectrolyte on the properties of stoichiometric and nonstoichiometric PECs was demonstrated. Formation of PECs by bottle-brush copolymers with high density of side-chains results in small, watersoluble, molecular complexes having nonspherical shape, independent of concentration. Whereas formation of PEC-aggregates was revealed by bottle-brush polyelectrolytes with low side chain density, the level of aggregation in these complexes is controlled by polyelectrolyte concentration. The structure of the PECs formed with low molecular weight polyanions is consistent with the picture that several small linear polyelectrolyte molecules associate with the large bottle-brush. In contrast, when complexation occurs between polyanions of high molecular weigh and the bottle-brush polymers considerably larger PECs are formed, consistent with several bottle-brush polymers associating with one high molecular weight polyanion.

Place, publisher, year, edition, pages
Stockholm: KTH-Royal Institute of Technology, 2011. xiii, 62 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2011:37
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-33666 (URN)978-91-7415-998-1 (ISBN)
Public defence
2011-06-01, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Swedish)
Opponent
Supervisors
Funder
Swedish Research Council
Note
QC 20110516Available from: 2011-05-16 Created: 2011-05-13 Last updated: 2012-03-12Bibliographically approved

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