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Article: A High-Performing, Visible-Light-Driven Actuating Material Responsive to Ultralow Light Intensities
Title | A High-Performing, Visible-Light-Driven Actuating Material Responsive to Ultralow Light Intensities |
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Authors | |
Keywords | actuators cobalt hydroxide cobalt oxide low light intensity visible‐light actuation |
Issue Date | 2019 |
Publisher | John Wiley & Sons. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2365-709X |
Citation | Advanced Materials Technologies, 2019, v. 4 n. 12, p. article no. 1900746 How to Cite? |
Abstract | Light‐driven actuating materials are highly desirable for miniaturized, untethered devices and microrobots. However, current light actuators require high light intensity or the use of UV or IR light to operate, which greatly increase the cost and difficulty for real‐life applications. Here, a significant visible (vis)‐light‐driven actuation effect in cobalt oxides/hydroxides (C–O–H), inducible at low intensities from ≈3 mW cm−2 (≈0.03 sun), is reported. In the form of bilayered films, the actuators can curl into loops at 70–180 ms per loop, corresponding to a high intrinsic strain of more than 1% at strain rate 0.6% s−1, and actuating stress exceeding 60 MPa, at ≈50 mW cm−2 (≈0.5 sun). Linear actuators made from actuating hinges of C–O–H can weightlift objects ≈200 times heavier than the active material. A chemo‐mechanics model describes the actuation well, showing that the mechanism is light‐induced volume shrinkage assisted by diffusion, and C–O–H exhibits outperforming chemical driving force per unit light‐intensity stimulation. |
Persistent Identifier | http://hdl.handle.net/10722/284073 |
ISSN | 2021 Impact Factor: 8.856 2020 SCImago Journal Rankings: 2.184 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Kwan, KW | - |
dc.contributor.author | Ngan, AHW | - |
dc.date.accessioned | 2020-07-20T05:55:52Z | - |
dc.date.available | 2020-07-20T05:55:52Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Advanced Materials Technologies, 2019, v. 4 n. 12, p. article no. 1900746 | - |
dc.identifier.issn | 2365-709X | - |
dc.identifier.uri | http://hdl.handle.net/10722/284073 | - |
dc.description.abstract | Light‐driven actuating materials are highly desirable for miniaturized, untethered devices and microrobots. However, current light actuators require high light intensity or the use of UV or IR light to operate, which greatly increase the cost and difficulty for real‐life applications. Here, a significant visible (vis)‐light‐driven actuation effect in cobalt oxides/hydroxides (C–O–H), inducible at low intensities from ≈3 mW cm−2 (≈0.03 sun), is reported. In the form of bilayered films, the actuators can curl into loops at 70–180 ms per loop, corresponding to a high intrinsic strain of more than 1% at strain rate 0.6% s−1, and actuating stress exceeding 60 MPa, at ≈50 mW cm−2 (≈0.5 sun). Linear actuators made from actuating hinges of C–O–H can weightlift objects ≈200 times heavier than the active material. A chemo‐mechanics model describes the actuation well, showing that the mechanism is light‐induced volume shrinkage assisted by diffusion, and C–O–H exhibits outperforming chemical driving force per unit light‐intensity stimulation. | - |
dc.language | eng | - |
dc.publisher | John Wiley & Sons. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2365-709X | - |
dc.relation.ispartof | Advanced Materials Technologies | - |
dc.rights | This is the peer reviewed version of the following article: Advanced Materials Technologies, which has been published in final form at https://doi.org/10.1002/admt.201900746. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. | - |
dc.subject | actuators | - |
dc.subject | cobalt hydroxide | - |
dc.subject | cobalt oxide | - |
dc.subject | low light intensity | - |
dc.subject | visible‐light actuation | - |
dc.title | A High-Performing, Visible-Light-Driven Actuating Material Responsive to Ultralow Light Intensities | - |
dc.type | Article | - |
dc.identifier.email | Kwan, KW: kwan15@hku.hk | - |
dc.identifier.email | Ngan, AHW: hwngan@hku.hk | - |
dc.identifier.authority | Ngan, AHW=rp00225 | - |
dc.description.nature | postprint | - |
dc.identifier.doi | 10.1002/admt.201900746 | - |
dc.identifier.scopus | eid_2-s2.0-85074670384 | - |
dc.identifier.hkuros | 311242 | - |
dc.identifier.volume | 4 | - |
dc.identifier.issue | 12 | - |
dc.identifier.spage | article no. 1900746 | - |
dc.identifier.epage | article no. 1900746 | - |
dc.identifier.isi | WOS:000492086500001 | - |
dc.publisher.place | Hong Kong | - |
dc.identifier.issnl | 2365-709X | - |