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- Rojas, Orland J.KTH,Kemi (author)
Coadsorption and surface forces for selective surfaces in contact with aqueous mixtures of oppositely charged surfactants and low charge density polyelectrolytes
- Article/chapterEnglish2004
Publisher, publication year, extent ...
- 2004-02-27
- American Chemical Society (ACS),2004
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:kth-23317
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-23317URI
- https://doi.org/10.1021/la035752wDOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-27175URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- QC 20100525
- A1656
- The coadsorption of a positively charged polyelectrolyte (with 10% of the segments carrying a permanent positive charge, AM-MAPTAC-10) and an anionic surfactant (sodium dodecyl sulfate, SDS) on silica and glass surfaces has been investigated using optical reflectometry and a noninterferometric surface force technique. This is a selective coadsorption system in the sense that the polyelectrolyte does adsorb to the surface in the absence of surfactant, whereas the surfactant does not adsorb in the absence of polyelectrolyte. It is found that the total adsorbed amount goes through a maximum when the SDS concentration is increased. Maximum adsorption is found when the polyelectrolyte/surfactant complexes formed in bulk solution are close to the charge neutralization point. Some adsorption does occur also when SDS is present in significant excess. The force measured between AM-MAPTAC-10-coated surfaces on approach in the absence of SDS is dominated at long range by an electrostatic double-layer force. Yet, layers formed by coadsorption from solutions containing both polyelectrolyte and surfactant generate long-range forces of an electrosteric nature. On separation, adhesive interactions are found only when the adsorbed amount is low, i.e., in the absence of SDS and in a large excess of SDS. The final state of the adsorbed layer is found to be nonhysteretic, i.e., independent of the history of the system. The conditions for formation of long-lived trapped adsorption states from mixed polymer-surfactant solutions are discussed.
Subject headings and genre
- NATURVETENSKAP Kemi hsv//swe
- NATURAL SCIENCES Chemical Sciences hsv//eng
- sodium dodecyl-sulfate
- nonionic cellulose polymers
- cetyltrimethylammonium bromide
- cationic polyelectrolyte
- integral-equations
- anionic surfactant
- adsorption
- silica
- mica
- interfaces
Added entries (persons, corporate bodies, meetings, titles ...)
- Claesson, Per M.RISE,KTH,Kemi,YKI – Ytkemiska institutet(Swepub:kth)u15tzvsb (author)
- Berglund, K. D. (author)
- Tilton, R. D. (author)
- KTHKemi (creator_code:org_t)
Related titles
- In:Langmuir: American Chemical Society (ACS)20:8, s. 3221-32300743-74631520-5827
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- Royal Institute of Technology
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