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Université de Fribourg

In vivo deployment of mechanically adaptive nanocomposites for intracortical microelectrodes

Harris, J. P. ; Hess, Andreas E. ; Rowan, Stuart J. ; Weder, Christoph ; Zorman, C. A. ; Tyler, D. J. ; Capadona, Jeffrey R.

In: Journal of Neural Engineering, 2011, vol. 8, no. 4, p. 046010

We recently introduced a series of stimuli-responsive, mechanically adaptive polymer nanocomposites. Here, we report the first application of these bio-inspired materials as substrates for intracortical microelectrodes. Our hypothesis is that the ideal electrode should be initially stiff to facilitate minimal trauma during insertion into the cortex, yet become mechanically compliant to match the...

Université de Fribourg

Self-assembly and alignment of semiconductor nanoparticles on cellulose nanocrystals

Padalkar, Sonal ; Capadona, Jeff R. ; Rowan, Stuart J. ; Weder, Christoph ; Moon, Robert J. ; Stanciu, Lia A.

In: Journal of Materials Science, 2011, vol. 46, no. 17, p. 5672-5679

The synthesis of cadmium sulfide (CdS), zinc sulfide (ZnS), and lead sulfide (PbS) nanoparticle chains on cellulose nanocrystal (CNC) templates can be accomplished by the reaction of the precursor salts. The use of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), was critical for the synthesis of well-defined semiconductor nanoparticle chains on the surface of the CNCs. The...

Université de Fribourg

Development of a stimuli-responsive polymer nanocomposite toward biologically optimized, MEMS-based neural probes

Hess, Andreas E. ; Capadona, Jeffrey R. ; Shanmuganathan, Kadhiravan ; Hsu, L. ; Rowan, Suart J. ; Weder, Christoph ; Tyler, D. J. ; Zorman, C. A.

In: Journal of Micromechanics and Microengineering, 2011, vol. 21, no. 5, p. 054009

This paper reports the development of micromachining processes and mechanical evaluation of a stimuli-responsive, mechanically dynamic polymer nanocomposite for biomedical microsystems. This nanocomposite consists of a cellulose nanofiber network encased in a polyvinyl acetate matrix. Micromachined tensile testing structures fabricated from the nanocomposite displayed a reversible and switchable...

Université de Fribourg

Natural biopolymers: novel templates for the synthesis of nanostructures

Padalkar, Sonal ; Capadona, Jephrey R. ; Rowan, Suart J. ; Weder, Christoph ; Won, Yu-Ho ; Stanciu, Lia A. ; Moon, Robert J.

In: Langmuir, 2010, vol. 26, no. 11, p. 8497–8502

Biological systems such as proteins, viruses, and DNA have been most often reported to be used as templates for the synthesis of functional nanomaterials, but the properties of widely available biopolymers, such as cellulose, have been much less exploited for this purpose. Here, we report for the first time that cellulose nanocrystals (CNC) have the capacity to assist in the synthesis of metallic...

Université de Fribourg

Review: current international research into cellulose nanofibres and nanocomposites

Eichhorn, S. J. ; Dufresne, A. ; Aranguren, M. ; Marcovich, N. E. ; Capadona, J. R. ; Rowan, S. J. ; Weder, Christoph ; Thielemans, W. ; Roman, M. ; Renneckar, S. ; Gindl, W. ; Veigel, S. ; Keckes, J. ; Yano, H. ; Abe, K. ; Nogi, M. ; Nakagaito, A. N. ; Mangalam, A. ; Simonsen, J. ; Benight, A. S. ; Bismarck, A. ; Berglund, L. A. ; Peijs, T.

In: Journal of Materials Science, 2010, vol. 45, no. 1, p. 1-33

This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections dealing with processing and characterisation of cellulose nanocomposites and new developments...

Université de Fribourg

Biomimetic mechanically adaptive nanocomposites

Shanmuganathan, Kadhiravan ; Capadona, Jeffrey R. ; Rowan, Stuart J. ; Weder, Christoph

In: Progress in Polymer Science, 2010, vol. 35, no. 1-2, p. 212–222

The development of a new class of mechanically adaptive nanocomposites has been inspired by biological creatures such as sea cucumbers, which have the ability to reversibly change the stiffness of their dermis. Several recent studies have related this dynamic mechanical behaviour to the distinctive nanocomposite architecture of the collagenous tissue, in which interactions among rigid collagen...

Université de Fribourg

Bio-inspired mechanically-adaptive nanocomposites derived from cotton cellulose whiskers

Shanmuganathan, Kadhiravan ; Capadona, Jeffrey R. ; Rowan, Stuart J. ; Weder, Christoph

In: Journal of Materials Chemistry, 2010, vol. 20, p. 180-186

A new series of biomimetic, stimuli-responsive nanocomposites, which change their mechanical properties upon exposure to physiological conditions, was investigated. The materials were produced by introducing percolating networks of cellulose whiskers isolated from cotton into poly(vinyl acetate). Below the glass-transition temperature (Tg∼ 63 °C), the tensile storage moduli...

Université de Fribourg

Stimuli-responsive mechanically adaptive polymer nanocomposites

Shanmuganathan, Kadhiravan ; Capadona, Jeffrey R. ; Rowan, Stuart J. ; Weder, Christoph

In: ACS Applied Materials & Interfaces, 2009, vol. 2, no. 1, p. 165–174

A new series of biomimetic stimuli-responsive nanocomposites, which change their mechanical properties upon exposure to physiological conditions, was prepared and investigated. The materials were produced by introducing percolating networks of cellulose nanofibers or “whiskers” derived from tunicates into poly(vinyl acetate) (PVAc), poly(butyl methacrylate) (PBMA), and blends of these...