Layer-by-layer construction of ultrathin hybrid films with proteins and clay minerals

Tamás Szabó, Márta Szekeres, Imre Dékány, Carine Jackers, Steven De Feyter, Cliff T. Johnston, Robert A. Schoonheydt

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42 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)12730-12740
Number of pages11
JournalJournal of Physical Chemistry C
Volume111
Issue number34
DOIs
Publication statusPublished - Aug 30 2007

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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