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Electro-orientation and electrorotation of metal nanowires

Electro-orientation and electrorotation of metal nanowires
Electro-orientation and electrorotation of metal nanowires
The physical mechanisms responsible for the electrical orientation and electrical rotation of metal nanowires suspended in an electrolyte as a function of frequency of the applied ac electric field are examined theoretically and experimentally. The alignment of a nanowire in an ac field with a fixed direction is called electro-orientation. The induced constant rotation of a nanowire in a rotating electric field is called electrorotation. In both situations, the applied electric field interacts with the induced charge in the electrical double layer at the metal-electrolyte interface, causing rotation due to the torque on the induced dipole, and also from induced-charge electro-osmotic flow around the particle. First, we describe the dipole theory that describes electro-orientation and electrorotation of perfectly polarizable metal rods. Second, based on a slender approximation, an analytical theory that describes induced-charge electro-orientation and electrorotation of metal nanowires is provided. Finally, experimental measurements of the electro-orientation and electrorotation of metal nanowires are presented and compared with theory, providing a comprehensive study of the relative importance between induced-dipole rotation and induced-charge electro-osmotic rotation.
1539-3755
63018
Arcenegui, Juan J
a27fdd5c-f9ba-4a49-973e-c70c55940456
García-Sánchez, Pablo
905183cb-9aa4-4e26-97b9-1917d762739d
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559
Arcenegui, Juan J
a27fdd5c-f9ba-4a49-973e-c70c55940456
García-Sánchez, Pablo
905183cb-9aa4-4e26-97b9-1917d762739d
Morgan, Hywel
de00d59f-a5a2-48c4-a99a-1d5dd7854174
Ramos, Antonio
511ab594-f312-45ce-b7ff-ef348fd9b559

Arcenegui, Juan J, García-Sánchez, Pablo, Morgan, Hywel and Ramos, Antonio (2013) Electro-orientation and electrorotation of metal nanowires. Physical Review E, 88 (6), 63018. (doi:10.1103/PhysRevE.88.063018). (PMID:24483568)

Record type: Article

Abstract

The physical mechanisms responsible for the electrical orientation and electrical rotation of metal nanowires suspended in an electrolyte as a function of frequency of the applied ac electric field are examined theoretically and experimentally. The alignment of a nanowire in an ac field with a fixed direction is called electro-orientation. The induced constant rotation of a nanowire in a rotating electric field is called electrorotation. In both situations, the applied electric field interacts with the induced charge in the electrical double layer at the metal-electrolyte interface, causing rotation due to the torque on the induced dipole, and also from induced-charge electro-osmotic flow around the particle. First, we describe the dipole theory that describes electro-orientation and electrorotation of perfectly polarizable metal rods. Second, based on a slender approximation, an analytical theory that describes induced-charge electro-orientation and electrorotation of metal nanowires is provided. Finally, experimental measurements of the electro-orientation and electrorotation of metal nanowires are presented and compared with theory, providing a comprehensive study of the relative importance between induced-dipole rotation and induced-charge electro-osmotic rotation.

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PhysRevE.88.063018 - Version of Record
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Published date: 27 December 2013
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 368165
URI: https://eprints.soton.ac.uk/id/eprint/368165
ISSN: 1539-3755
PURE UUID: 75213cb1-8e86-45f1-81a4-f3af5a7f6ee9
ORCID for Hywel Morgan: ORCID iD orcid.org/0000-0003-4850-5676

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Date deposited: 19 Aug 2014 12:04
Last modified: 20 Jul 2019 00:59

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Contributors

Author: Juan J Arcenegui
Author: Pablo García-Sánchez
Author: Hywel Morgan ORCID iD
Author: Antonio Ramos

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