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Title: Layer-by-layer construction of ultrathin hybrid films with proteins and clay minerals
Authors: Szabo, Tama S ×
Szekeres, Marta
Dekany, Imre
Jackers, Carine
De Feyter, Steven
Johnston, Cliff T
Schoonheydt, Robert #
Issue Date: Aug-2007
Publisher: American Chemical Society
Series Title: Journal of Physical Chemistry C vol:111 issue:34 pages:12730-12740
Abstract: Mono- and multilayered clay mineral-protein films were constructed with the layer-by-layer deposition technique. The clay mineral saponite and three proteins (protamine, lysozyme, and papain) were tested. Multilayers with up to 15-15 alternating layers of saponite and protein were built up on glass, quartz, and ZnSe. In some cases these supports were primed with the poly(diallyldimethylammonium) cation before clay/protein deposition. The deposition process can be followed by UV and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and by atomic force microscopy (AFM). X-ray diffraction (XRD) patterns confirm the regular ordering of the layers. The "average" protein layer has the thickness of single molecules. The thickness of the "average" saponite layer is proportional to the positive charge density of the protein and varies between 0.6 and 3 elementary saponite sheets. The layers of protamine and lysozyme are stable. However, a small amount of papain is lost upon deposition of the subsequent saponite layer. H-D exchange of proteins in the films is fast and reversible.
URI: 
ISSN: 1932-7447
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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