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Micromechanical investigations on films made of recombinant spider silk proteins and silk fibroin

: Junghans, F.; Conrad, U.; Heilmann, A.; Spohn, U.

Materials Research Society -MRS-:
Protein and peptide engineering for therapeutic and functional materials : November 26 - 30, 2007, Boston, Massachusetts, USA; 2007 MRS fall meeting; Symposium NN
Red Hook, NY: Curran, 2008 (Materials Research Society Symposium Proceedings 1062)
ISBN: 978-1-605-60836-5
ISSN: 0272-9172
Symposium NN "Protein and Peptide Engineering for Therapeutic and Functional Materials" <2007, Boston/Mass.>
Materials Research Society (Fall Meeting) <2007, Boston/Mass.>
Fraunhofer IWM ()

Films made of a recombinant spider silk protein and silk fibroin were prepared by spincoating and casting. Therefore the solubility of these substances was investigated in hexafluoroisopropa-nol, ionic liquids and concentrated salt solutions. The roughness and the thickness of the protein films were determined by the Atomic Force Microscopy (AFM) and by mechanical profilometry. The micromechanical behaviour was investigated by acoustic impedance analysis using a quartz crystal microbalance (QCMB) as well as by microindentation. Films with thickness less than 350 nm revealed an almost ideal elastic behaviour in the range of 5 to 75 MHz. At a higher film thickness the half-band-half width increases considerably and the films show a viscoelastic behaviour with a considerable dissipation. The relative humidity significantly influences the mechanical behaviour of protein films. Hence the microhardness and the ability of water adsorption were determined in dependence on the r elative humidity.