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In situ ATR‐FTIR and SFM Studies on the Influence of Adsorption time on Deposition and Nanostructure of Poly(ethyleneimine)/Poly(acrylic acid) Multilayers
Author(s) -
Muller M.,
Paulik S.
Publication year - 2008
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200850509
Subject(s) - polyelectrolyte , adsorption , acrylic acid , fourier transform infrared spectroscopy , nanostructure , chemical engineering , materials science , deposition (geology) , cationic polymerization , ethyleneimine , polymer chemistry , analytical chemistry (journal) , chemistry , nanotechnology , chromatography , copolymer , organic chemistry , composite material , polymer , paleontology , sediment , engineering , biology
Summary: The deposition and the nanostructure of polyelectrolyte multilayers (PEM) of branched poly(ethyleneimine)/poly(acrylic acid) (PEI/PAC) was studied in dependence of the adsorption time (t ADS ) of the individual steps. PEM were reproducibly deposited applying up to z = 20 adsorption steps at the fixed pH combination of 10/4 and polyelectrolyte concentration c PEL = 0.005 M in a flow cell using an automated valve system. in situ ATR‐FTIR spectroscopy and SFM were used for quantitative determination of deposited amount and thickness, respectively. A linear relation between PEL band integrals and thickness of thin PEM films was found. Varying t ADS from 0.5 to 5 min in each of the adsorption steps resulted in a steep rise of the deposited PEM amount. For t ADS > 5 min the deposition did only marginally increase. Evidence for the release of outermost located PEI upon PAC immersion (even step) and of outermost PAC upon PEI immersion (odd step) was obtained. SFM images on consecutively deposited PEM‐6 showed a slight increase in structure size and roughness for increasing t ADS . These studies help to prepare polyelectrolyte based films with controlled thickness for the interaction with biofluids in the biomedical and food field.