Efficient and stable electrorheological fluids based on chestnut-like cobalt hydroxidecoupled with surface-functionalized carbon dots

Liang, Y; Liu, Y; Zhou, Y; Shi, Q; Zhang, M; Li, Y; Wen, W; Feng, L; Wu, J

Efficient and stable electrorheological fluids based on chestnut-like cobalt hydroxidecoupled with surface-functionalized carbon dots

Liang, Y Liu, Y Zhou, Y Shi, Q Zhang, M Li, Y

Wen, W Feng, L Wu, J

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Publisher:: Royal Society of Chemistry
Publication Type:: Journal Article
Citation:: Soft Matter, 2022, 18, (20), pp. 3845-3855
Issue Date:: 2022-04-04

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Field	Value	Language
dc.contributor.author	Liang, Y
dc.contributor.author	Liu, Y
dc.contributor.author	Zhou, Y
dc.contributor.author	Shi, Q
dc.contributor.author	Zhang, M
dc.contributor.author	Li, Y https://orcid.org/0000-0002-6720-8493
dc.contributor.author	Wen, W
dc.contributor.author	Feng, L
dc.contributor.author	Wu, J
dc.date.accessioned	2023-03-23T03:06:03Z
dc.date.available	2023-03-23T03:06:03Z
dc.date.issued	2022-04-04
dc.identifier.citation	Soft Matter, 2022, 18, (20), pp. 3845-3855
dc.identifier.issn	1744-683X
dc.identifier.issn	1744-6848
dc.identifier.uri	http://hdl.handle.net/10453/168179
dc.description.abstract	Intrinsically polarized electrorheological fluids (ERFs) have better thermal stability than ERFs with polar molecules, so they have a broader application prospect. However, the electrorheological efficiency of the common intrinsically polarized ERF is still lower than 1500, which is related to the poor wettability between polarized materials and the continuous phase. Carbon dots (CDs) exhibit good stability, semiconductor properties and low toxicity. We prepared biomimetic chestnut-like cobalt hydroxide coupled with surface-functionalized CD particles (Co(OH)2@CDs) by a simple hydrothermal method. Then we prepared an ERF by mixing Co(OH)2@CDs with silicone oil and studied the effect of CDs on its rheology and electrorheology properties. The synergistic effect of the lipophilic groups on the surface of CDs and the biomimetic chestnut-like structure makes Co(OH)2@CDs exhibit good wettability with silicone oil, and the optimal zero-field viscosity of Co(OH)2@CDs-ERF is only 0.46 Pa s (particle mass fraction of 40%). Exceptional electrorheological efficiency (about 10 000, shear rate 0.1 s-1, 5 kV mm-1) and dynamic shear stress stability of optimal Co(OH)2@CDs-ERF can be attributed to the dielectric enhancement of the biomimetic chestnut-like structure coupled with the semiconductor properties of CDs. In addition, Co(OH)2@CDs-ERF has excellent anti-settling performance, outstanding thermal stability and low current density.
dc.format	Electronic
dc.language	eng
dc.publisher	Royal Society of Chemistry
dc.relation.ispartof	Soft Matter
dc.relation.isbasedon	10.1039/d2sm00176d
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	02 Physical Sciences, 03 Chemical Sciences, 09 Engineering
dc.subject.classification	Chemical Physics
dc.subject.mesh	Carbon
dc.subject.mesh	Cobalt
dc.subject.mesh	Hydroxides
dc.subject.mesh	Silicone Oils
dc.subject.mesh	Hydroxides
dc.subject.mesh	Carbon
dc.subject.mesh	Cobalt
dc.subject.mesh	Silicone Oils
dc.subject.mesh	Carbon
dc.subject.mesh	Cobalt
dc.subject.mesh	Hydroxides
dc.subject.mesh	Silicone Oils
dc.title	Efficient and stable electrorheological fluids based on chestnut-like cobalt hydroxidecoupled with surface-functionalized carbon dots
dc.type	Journal Article
utslib.citation.volume	18
utslib.location.activity	England
utslib.for	02 Physical Sciences
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
pubs.consider-herdc	true
dc.date.updated	2023-03-23T03:06:00Z
pubs.issue	20
pubs.publication-status	Accepted
pubs.volume	18
utslib.citation.issue	20

Abstract:

Intrinsically polarized electrorheological fluids (ERFs) have better thermal stability than ERFs with polar molecules, so they have a broader application prospect. However, the electrorheological efficiency of the common intrinsically polarized ERF is still lower than 1500, which is related to the poor wettability between polarized materials and the continuous phase. Carbon dots (CDs) exhibit good stability, semiconductor properties and low toxicity. We prepared biomimetic chestnut-like cobalt hydroxide coupled with surface-functionalized CD particles (Co(OH)2@CDs) by a simple hydrothermal method. Then we prepared an ERF by mixing Co(OH)2@CDs with silicone oil and studied the effect of CDs on its rheology and electrorheology properties. The synergistic effect of the lipophilic groups on the surface of CDs and the biomimetic chestnut-like structure makes Co(OH)2@CDs exhibit good wettability with silicone oil, and the optimal zero-field viscosity of Co(OH)2@CDs-ERF is only 0.46 Pa s (particle mass fraction of 40%). Exceptional electrorheological efficiency (about 10 000, shear rate 0.1 s-1, 5 kV mm-1) and dynamic shear stress stability of optimal Co(OH)2@CDs-ERF can be attributed to the dielectric enhancement of the biomimetic chestnut-like structure coupled with the semiconductor properties of CDs. In addition, Co(OH)2@CDs-ERF has excellent anti-settling performance, outstanding thermal stability and low current density.

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http://hdl.handle.net/10453/168179