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UV-Assisted Direct-Write Assembly of Scaffold-Templated Nanoclay Composites via Biotin-Streptavidin Interactions

[+] Author Affiliations
Hamid Dalir, Roohollah Dermanaki Farahani, Martin Lévesque, Daniel Therriault

École Polytechnique de Montréal, Montréal, QC, Canada

Paper No. IMECE2010-39103, pp. 899-904; 6 pages
doi:10.1115/IMECE2010-39103
From:
  • ASME 2010 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro and Nano Systems
  • Vancouver, British Columbia, Canada, November 12–18, 2010
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4447-2
  • Copyright © 2010 by ASME

abstract

Three-dimensional epoxy scaffolds with abundant active epoxy groups on surfaces were fabricated through UV-assisted direct-write manufacturing process. The prepared scaffolds composed of cylindrical filaments (diameter ∼100 μm) were aminated by reacting the epoxy groups with 1, 3-diaminopropane. The resulting aminated scaffolds were subsequently biotinylated and then successfully applied to immobilize biotinylated nanoclay conjugates via a specific, strong and rapid binding of biotin and streptavidin. In another approach, the same amount of nanoclays was properly dispersed in epoxy by three-roll mill machine inducing high shear mixing. The nanoclay-epoxy filaments were then deposited by a computerized-control robot in a 3D micro structure scaffold form. Tensile mechanical tests were performed with a dynamic mechanical analysis (DMA) using a film tension clamp on three microstructures: nanoclay-epoxy scaffolds, aminated-biotinylated nanoclays coated on unloaded epoxy scaffolds and finally unloaded epoxy scaffolds (used as a reference). DMA tensile measurements indicated a slight improvement in modulus (by ∼5%), but significant increase in strength (by ∼24%), fracture strain (by ∼21%) and fracture energy (by ∼38%) by introducing biotin-streptavidin strong bonds among epoxy scaffolds and nanoclays in comparison with those of mixed nanoclay-epoxy scaffolds. These mechanical improvements are attributed to the strong biotin and streptavidin bonds between the epoxy scaffolds and nanoclays.

Copyright © 2010 by ASME

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