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Selected Publication:

Iturri, J; Vianna, AC; Moreno-Cencerrado, A; Pum, D; Sleytr, UB; Toca-Herrera, JL.
(2017): Impact of surface wettability on S-layer recrystallization: a real-time characterization by QCM-D
BEILSTEIN J NANOTECH. 2017; 8: 91-98. FullText FullText_BOKU

Quartz crystal microbalance with dissipation monitoring (QCM-D) has been employed to study the assembly and recrystallization kinetics of isolated SbpA bacterial surface proteins onto silicon dioxide substrates of different surface wettability. Surface modification by UV/ ozone oxidation or by vapor deposition of 1H, 1H, 2H, 2H-perfluorododecyltrichlorosilane yielded hydrophilic or hydrophobic samples, respectively. Time evolution of frequency and dissipation factors, either individually or combined as the so-called Df plots, showed a much faster formation of crystalline coatings for hydrophobic samples, characterized by a phase-transition peak at around the 70% of the total mass adsorbed. This behavior has been proven to mimic, both in terms of kinetics and film assembly steps, the recrystallization taking place on an underlying secondary cell-wall polymer (SCWP) as found in bacteria. Complementary atomic force microscopy (AFM) experiments corroborate these findings and reveal the impact on the final structure achieved.
Authors BOKU Wien:
Iturri Jagoba
Moreno Cencerrado Alberto
Pum Dietmar
Sleytr Uwe B.
Toca-Herrera José Luis
Vianna Cintra Ana Carolina

Find related publications in this database (Keywords)
bacterial S-layers
Quartz crystal microbalance with dissipation monitoring (QCM-D)
recrystallization kinetics
surface wettability

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