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Tailoring the mechanical properties of starch-containing layer-by-layer films
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8622-0386
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
Abstract [en]

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.
Keyword [en]
Cationic starch, Anionic starch, Nanofibrillated cellulose, Silica nanoparticles, Layer-by-layer assembly, Young's modulus
National Category
Materials Chemistry Paper, Pulp and Fiber Technology Nano Technology
Identifiers
URN: urn:nbn:se:kth:diva-41020DOI: 10.1016/j.colsurfa.2011.11.017ISI: 000300867800003Scopus ID: 2-s2.0-84855285311OAI: oai:DiVA.org:kth-41020DiVA: diva2:443042
Note

QC 20120326

Available from: 2011-09-23 Created: 2011-09-23 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Molecular Interactions in Thin Films of Biopolymers, Colloids and Synthetic Polyelectrolytes
Open this publication in new window or tab >>Molecular Interactions in Thin Films of Biopolymers, Colloids and Synthetic Polyelectrolytes
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The development of the layer-by-layer (LbL) technique has turned out to be an efficient way to physically modify the surface properties of different materials, for example to improve the adhesive interactions between fibers in paper. The main objective of the work described in this thesis was to obtain fundamental data concerning the adhesive properties of wood biopolymers and LbL films, including the mechanical properties of the thin films, in order to shed light on the molecular mechanisms responsible for the adhesion between these materials.

LbLs constructed from poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA), starch containing LbL films, and LbL films containing nanofibrillated cellulose (NFC) were studied with respect to their adhesive and mechanical properties. The LbL formation was studied using a combination of stagnation point adsorption reflectometry (SPAR) and quartz crystal microbalance with dissipation (QCM-D) and the adhesive properties of the different LbL films were studied in water using atomic force microscopy (AFM) colloidal probe measurements and under ambient conditions using the Johnson-Kendall-Roberts (JKR) approach. Finally the mechanical properties were investigated by mechanical buckling and the recently developed SIEBIMM technique (strain-induced elastic buckling instability for mechanical measurements).

From colloidal probe AFM measurements of the wet adhesive properties of surfaces treated with PAH/PAA it was concluded that the development of strong adhesive joints is very dependent on the mobility of the polyelectrolytes and interdiffusion across the interface between the LbL treated surfaces to allow for polymer entanglements.

Starch is a renewable, cost-efficient biopolymer that is already widely used in papermaking which makes it an interesting candidate for the formation of LbL films in practical systems. It was shown, using SPAR and QCM-D, that LbL films can be successfully constructed from cationic and anionic starches on silicon dioxide and on polydimethylsiloxane (PDMS) substrates. Colloidal probe AFM measurements showed that starch LbL treatment have potential for increasing the adhesive interaction between solid substrates to levels beyond those that can be reached by a single layer of cationic starch. Furthermore, it was shown by SIEBIMM measurements that the elastic properties of starch-containing LbL films can be tailored using different nanoparticles in combination with starch.

LbL films containing cellulose I nanofibrils were constructed using anionic NFC in combination with cationic NFC and poly(ethylene imine) (PEI) respectively. These NFC films were used as cellulose model surfaces and colloidal probe AFM was used to measure the adhesive interactions in water. Furthermore, PDMS caps were successfully coated by LbL films containing NFC which enabled the first known JKR adhesion measurements between cellulose/cellulose, cellulose/lignin and cellulose/glucomannan. The measured adhesion and adhesion hysteresis were similar for all three systems indicating that there are no profound differences in the interaction between different wood biopolymers. Finally, the elastic properties of PEI/NFC LbL films were investigated using SIEBIMM and it was shown that the stiffness of the films was highly dependent on the relative humidity.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. ix, 56 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2011:50
Keyword
Polyelectrolyte multilayers, Layer-by-Layer assembly, Adhesion, Adsorption, Young's modulus, Mechanical buckling, AFM, JKR, SPAR, QCM-D, SIEBIMM, PAH, PAA, Starch, NFC, Nanocellulose
National Category
Materials Chemistry Paper, Pulp and Fiber Technology Nano Technology
Identifiers
urn:nbn:se:kth:diva-41023 (URN)978-91-7501-098-4 (ISBN)
Public defence
2011-10-14, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20110923

Available from: 2011-09-23 Created: 2011-09-23 Last updated: 2014-10-03Bibliographically approved

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Wågberg, Lars

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