The researchers used Scotch tape to create a tiny grasping claw that collects droplets of water, an innovation could be used to collect water samples for environmental testing. The material, seen here, becomes flexible when exposed to humidity and returns to its original shape when dry. (Manuel Ochoa, Purdue University) A publication-quality image is available at http://news.uns.purdue.edu/images/2012/ziaie-grippers.jpg
Credit: Manuel Ochoa, Purdue University
Writer: Emil Venere, 765-494-4709, firstname.lastname@example.org
Sources: Babak Ziaie, 765-494-0725, email@example.com
Manuel Ochoa, firstname.lastname@example.org
Babak Ziaie: https://engineering.purdue.edu/ECE/People/profile?resource_id=2839
IMAGE CAPTION:The graspers were coated with magnetic particles, which could allow researchers to retrieve the devices in the field by using a magnet. (Manuel Ochoa, Purdue University)
Laser-Micromachined Magnetically-Functionalized Hygroscopic Bilayer: A Low-Cost Smart Material
Manuel Ochoa 1,4, Girish Chitnis 2,4, and Babak Ziaie 1,3,4*
1School of Electrical and Computer Engineering, Purdue University
2School of Mechanical Engineering
3 Weldon School of Biomedical Engineering
4Birck Nanotechnology Center
In this paper, we describe the design, fabrication, and characterization of magnetically functionalized humidity-responsive bilayers. We investigated two different ferrofluid embedded material structures: 1) cellulose-acetate sheet bonded to an acetate-backed adhesive (3M Scotch® GiftWrap Tape) (CA/GWT) and 2) a commercially available acetate-backed adhesive (3M Scotch® MagicTape) (MT). Cantilevers and other mechanical structures such as grippers were fabricated using laser micro-machining and exposed to humidity and magnetic fields. Such bilayers take advantage of the hygroscopic properties of cellulose acetate for their humidity response while simultaneously allowing one to remotely manipulate the structure using a magnetic field. The maximum radius of curvature in a humidity saturated environment for a CA/GWT cantilever (2 mm × 19 mm × 157 µm) was measured to be 7 mm, whereas the MT showed a smaller radius of curvature (
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