TY  - JOUR
AU  - Guenther, Jens-Uwe
AU  - Ahrens, Heiko
AU  - Helm, Christiane A.
AU  - DESY
TI  - Two-Dimensional Lamellar Phase of Poly(styrene Sulfonate)Adsorbed Onto an Oppositely Charged Lipid Monolaye
JO  - Langmuir
VL  - 25
SN  - 0743-7463
CY  - Washington, DC
PB  - ACS Publ.
M1  - PHPPUBDB-7403
SP  - 1500-1508
PY  - 2009
N1  - (c) American Chemical Society. Post referee full text in progress (embargo 1 year from January 6, 2009).
AB  - 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.
KW  - Adsorption
KW  - Alkylation
KW  - Electrolytes
KW  - Lipids: chemistry
KW  - Polystyrenes: chemistry
KW  - Quaternary Ammonium Compounds: chemistry
KW  - X-Ray Diffraction
KW  - Electrolytes (NLM Chemicals)
KW  - Lipids (NLM Chemicals)
KW  - Polystyrenes (NLM Chemicals)
KW  - Quaternary Ammonium Compounds (NLM Chemicals)
KW  - dimethyldioctadecylammonium (NLM Chemicals)
KW  - polystyrene sulfonic acid (NLM Chemicals)
LB  - PUB:(DE-HGF)16
C6  - pmid:19125602
UR  - <Go to ISI:>//WOS:000262827400036
DO  - DOI:10.1021/la802987k
UR  - https://bib-pubdb1.desy.de/record/87266
ER  -