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Article: Chemo-mechanical instability of light-induced humidity responsive bilayered actuators

TitleChemo-mechanical instability of light-induced humidity responsive bilayered actuators
Authors
KeywordsBilayered actuator
Instability
Cobalt oxides/hydroxides
Light-induced actuation
Issue Date2020
PublisherElsevier BV. The Journal's web site is located at JournalsCustomerServiceEMEA@elsevier.com
Citation
Extreme Mechanics Letters, 2020, v. 39, p. article no. 100801 How to Cite?
AbstractRecently discovered light-induced bilayered actuators comprising a light-responsive actuating layer supported by a passive layer are versatile in miniaturized robotics applications, owing to their simple, compact construction and wireless, self-contained mode of actuation. However, the chemo-mechanics and quantitative description of their actuation mechanisms are not sufficiently understood. Here, based on a chemo-mechanics model, a novel instability phenomenon leading to extraordinarily large magnitudes of the bending actuation of bilayered actuators is found and experimentally proven. At specific ratios of the elastic moduli and thicknesses of the active and passive layers, and activation volume of the actuation mechanism, the actuation of the active layer will be put into a positive feedback mode where the actuation-induced bending of the cantilever structure triggers a compressive stress in a surface region of the active layer which enhances further contractive actuation of the latter by means of light-induced water de-intercalation. The beneficial instability is observed and analyzed for two active material systems that exhibit such a light-induced water de-intercalation mechanism, namely, cobalt-oxides/hydroxides (C-O-H) and nickel hydroxide/oxyhydroxide (N-H-O). Experimental results agree well with predictions of the chemo-mechanics model, thus verifying its applicability to design high-performing actuation systems.
Persistent Identifierhttp://hdl.handle.net/10722/284075
ISSN
2019 Impact Factor: 4.806
2015 SCImago Journal Rankings: 0.720

 

DC FieldValueLanguage
dc.contributor.authorMA, W-
dc.contributor.authorKwan, KW-
dc.contributor.authorWU, R-
dc.contributor.authorNgan, AHW-
dc.date.accessioned2020-07-20T05:55:53Z-
dc.date.available2020-07-20T05:55:53Z-
dc.date.issued2020-
dc.identifier.citationExtreme Mechanics Letters, 2020, v. 39, p. article no. 100801-
dc.identifier.issn2352-4316-
dc.identifier.urihttp://hdl.handle.net/10722/284075-
dc.description.abstractRecently discovered light-induced bilayered actuators comprising a light-responsive actuating layer supported by a passive layer are versatile in miniaturized robotics applications, owing to their simple, compact construction and wireless, self-contained mode of actuation. However, the chemo-mechanics and quantitative description of their actuation mechanisms are not sufficiently understood. Here, based on a chemo-mechanics model, a novel instability phenomenon leading to extraordinarily large magnitudes of the bending actuation of bilayered actuators is found and experimentally proven. At specific ratios of the elastic moduli and thicknesses of the active and passive layers, and activation volume of the actuation mechanism, the actuation of the active layer will be put into a positive feedback mode where the actuation-induced bending of the cantilever structure triggers a compressive stress in a surface region of the active layer which enhances further contractive actuation of the latter by means of light-induced water de-intercalation. The beneficial instability is observed and analyzed for two active material systems that exhibit such a light-induced water de-intercalation mechanism, namely, cobalt-oxides/hydroxides (C-O-H) and nickel hydroxide/oxyhydroxide (N-H-O). Experimental results agree well with predictions of the chemo-mechanics model, thus verifying its applicability to design high-performing actuation systems.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at JournalsCustomerServiceEMEA@elsevier.com-
dc.relation.ispartofExtreme Mechanics Letters-
dc.subjectBilayered actuator-
dc.subjectInstability-
dc.subjectCobalt oxides/hydroxides-
dc.subjectLight-induced actuation-
dc.titleChemo-mechanical instability of light-induced humidity responsive bilayered actuators-
dc.typeArticle-
dc.identifier.emailKwan, KW: kwan15@hku.hk-
dc.identifier.emailNgan, AHW: hwngan@hku.hk-
dc.identifier.authorityNgan, AHW=rp00225-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.eml.2020.100801-
dc.identifier.scopuseid_2-s2.0-85085644340-
dc.identifier.hkuros311244-
dc.identifier.volume39-
dc.identifier.spagearticle no. 100801-
dc.identifier.epagearticle no. 100801-
dc.publisher.placeNetherlands-

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