Tailoring the mechanical properties of starch-containing layer-by-layer films
2012 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 394, 14-22 p.Article in journal (Refereed) Published
The Young's modulus of layer-by-layer (LbL) films containing starch was determined using the recently developed SIEBIMM (strain-induced elastic buckling instability for mechanical measurements) technique. By using cationic starch (CS) in combination with anionic starch (AS), silica nanoparticles (SNP), and nanofibrillated cellulose (NFC), the mechanical properties of these sub-micrometer starch-containing LbL films could be tailored. At 50% relative humidity (RH), the Young's modulus of CS/AS, CS/SNP, and CS/NFC was 0.6 GPa, 0.9 GPa, and 1.8 GPa, respectively, in the 25-85-nm thickness range. As expected for these hygroscopic starch-containing LbL films, the mechanical properties depended on RH. At 0% RH, the Young's modulus was 2-4.5 times higher than at 50% RH. The LbL buildup on polydimethylsiloxane (PDMS) was studied in situ using quartz crystal microgravimetry with dissipation (QCM-D), and atomic force microscopy (AFM) was used to characterize the surface morphology and thickness of the films.
Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 394, 14-22 p.
Cationic starch, Anionic starch, Nanofibrillated cellulose, Silica nanoparticles, Layer-by-layer assembly, Young's modulus
Materials Chemistry Paper, Pulp and Fiber Technology Nano Technology
IdentifiersURN: urn:nbn:se:kth:diva-41020DOI: 10.1016/j.colsurfa.2011.11.017ISI: 000300867800003ScopusID: 2-s2.0-84855285311OAI: oai:DiVA.org:kth-41020DiVA: diva2:443042
QC 201203262011-09-232011-09-232016-04-26Bibliographically approved