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Title: Actuation and locomotion driven by moisture in paper made with natural pollen
Authors: Zhao, Ze
Hwang, Youngkyu
Yang, Yun
Fan, Tengfei
Song, Juha
Suresh, Subra
Cho, Nam-Joon
Keywords: Engineering::Materials
Issue Date: 2020
Source: Zhao, Z., Hwang, Y., Yang, Y., Fan, T., Song, J., Suresh, S. & Cho, N. (2020). Actuation and locomotion driven by moisture in paper made with natural pollen. Proceedings of the National Academy of Sciences of the United States of America, 117(16), 8711-8718.
Project: NRF-CRP10-2012-07
Journal: Proceedings of the National Academy of Sciences of the United States of America
Abstract: Here we describe the development of a humidity-responsive sheet of paper that is derived solely from natural pollen. Adaptive soft material components of the paper exhibit diverse and well-integrated responses to humidity that promote shape reconfiguration, actuation, and locomotion. This mechanically versatile and nonallergenic paper can generate a cyclically high contractile stress upon water absorption and desorption, and the rapid exchange of water drives locomotion due to hydrodynamic effects. Such dynamic behavior can be finely tuned by adjusting the structure and properties of the paper, including thickness, surface roughness, and processing conditions, analogous to those of classical soapmaking. We demonstrate that humidity-responsive paper-like actuators can mimic the blooming of the Michelia flower and perform self-propelled motion. Harnessing the material properties of bioinspired systems such as pollen paper opens the door to a wide range of sustainable, eco-friendly, and biocompatible material innovation platforms for applications in sensing, actuation, and locomotion.
ISSN: 0027-8424
DOI: 10.1073/pnas.1922560117
Rights: © 2020 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles
SCBE Journal Articles

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