Journal Article

PHPPUBDB-7403

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Two-Dimensional Lamellar Phase of Poly(styrene Sulfonate)Adsorbed Onto an Oppositely Charged Lipid Monolaye

Guenther, J.-U.Extern* ; Ahrens, H.Extern* ; Helm, C. A. (Corresponding author)Extern* ; DESY

2009
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/la802987k

Abstract: Polystyrene sulfonate (PSS 77 kDa) adsorbed onto oppositely charged dioctadecyldimethylammonium bromide (DODA) monolayers at the air/water interface is investigated with X-ray reflectivity and grazing incidence diffraction. The alkyl tails of DODA in the condensed phase form an oblique lattice with large tilts and intermediate azimuth angle. On PSS adsorption, the alkyl tail structure is maintained; only the tilt angle changes. Bragg peaks caused by flatly adsorbed, aligned PSS chains are observed, when DODA is in the fluid and also when it is in the condensed phase. The two-dimensional lamellar phase is only found at intermediate PSS bulk concentrations (0.001-1 mmol/L). In this phase, the PSS coverage can be varied by a factor of 3, depending on DODA molecular area and polymer bulk concentration. Charge compensation in the lamellar phase is almost achieved at 1 mmol/L. At larger bulk concentrations, PSS adsorbs flatly yet without chain alignment. Presumably, a necessary condition for a two-dimensional lamellar phase is a pronounced electrostatic force which causes a large persistence length as well as repulsion between the aligned chains.

Keyword(s): Adsorption (MeSH) ; Alkylation (MeSH) ; Electrolytes (MeSH) ; Lipids: chemistry (MeSH) ; Polystyrenes: chemistry (MeSH) ; Quaternary Ammonium Compounds: chemistry (MeSH) ; X-Ray Diffraction (MeSH) ; Electrolytes ; Lipids ; Polystyrenes ; Quaternary Ammonium Compounds ; dimethyldioctadecylammonium ; polystyrene sulfonic acid

Note: (c) American Chemical Society. Post referee full text in progress (embargo 1 year from January 6, 2009).

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Contributing Institute(s):

1. Experiments with synchrotron radiation (HASYLAB(-2012))

Research Program(s):

1. DORIS Beamline BW1 (POF1-550) (POF1-550)
2. FS-Proposal: II-20080134 (II-20080134) (II-20080134)

Experiment(s):

1. DORIS Beamline BW1 (DORIS III)

Appears in the scientific report 2009
Notes: (c) American Chemical Society. No copyright permission for full text.

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Database coverage:
; JCR ; No Author Disambiguation ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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