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Title: Plant-based torsional actuator with memory

Source: Smart Mater. Struct. 22, 072001, 2013; p. 7.

Author(s)Plaza, Nayomi; Zelinka, Samuel L.; Stone, Don S.; Jakes, Joseph E.

Publication Year: 2013  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4707-2B  FPL-4723-1B

Abstract: A bundle of a few loblolly pine (Pinus taeda) cells are moisture-activated torsional actuators that twist multiple revolutions per cm length in direct proportion to moisture content. The bundles generate 10 N m kg􀀀1 specific torque during both twisting and untwisting, which is higher than an electric motor. Additionally, the bundles exhibit a moisture-activated, shape memory twist effect. Over 70% of the twist in a wetted bundle can be locked-in by drying under constraint and then released by rewetting the bundle. Our results indicate that hemicelluloses dominate the shape fixity mechanism and lignin is primarily responsible for remembering the bundle’s original form. The bundles demonstrate proof of a high specific torque actuator with large angles of rotation and shape memory twist capabilities that can be used in microactuators, sensors, and energy harvesters.

Keywords: shape memory; wood; twist

Publication Review Process: Formally Refereed

File size: 1,042 kb(s)

Date posted: 08/26/2013

This publication is also viewable on Treesearch:  view
RITS Product ID: 64948
Current FPL Scientists associated with this product (listed alphabetically)
Jakes, Joseph
Research Materials Engineer
Zelinka, Samuel L.
Materials Research Engineer
 

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