Electrochemical Synthesis of Nanostractured porous materials using Liquid Crystal and Colloidal Templates and their Magnetic and Optical properties
Electrochemical Synthesis of Nanostractured porous materials using Liquid Crystal and Colloidal Templates and their Magnetic and Optical properties
The objective of this thesis is to synthesise new classes of nanostructured porous materials that have ordered pore structures on multiple and vastly different length scales for improved catalytic, magnetic and optical properties. This is achieved by electrochemical deposition using two different templating approaches, lyotropic liquid crystalline and colloidal templates. In the first approach, nanostructured metals such as cobalt, copper and lead with high degrees of mesoscopic ordering and different phase structures, were prepared by the electrochemical reduction of the metal ions dissolved on the aqueous domain of the hexagonal (H), cubic (I) or lamella (Lα) liquid crystalline phases of Brij 56 and Brij 78 surfactants. The perodicities and pore diameters of the resulting mesoporous meals are varied in a controlled way over the range from 5 to 11 nm. This was achieved by changing the alkyl chain length of the surfactant or by the addition of an hydrophobic agent. The resulting nanostructured mesoporous cobalt film was shown to behave as a hard magnet in comparison to bulk polycrystalline cobalt.
In the second templating approach, materials such as gold, platinum, cobalt, palladium, lead, nickel, nickel iron alloy, lead oxides and conducting polymer films with highly ordered macroporous structures were prepared by the electrochemical deposition within the interstitial spaces between polystyrene latex spheres assembled on conducting substrates. After removing the sphere templates, the resulting films show well-formed, regular, two- and three-dimensional macroporous networks consisting of spherical pores arranged in a highly ordered face centred cubic (fcc) structure. The spherical voids are interconnected by a series of smaller windows that form an open porous structure embedded in the material framework.
University of Southampton
2001
Ghanem, Mohamed Ali M.A
(2001)
Electrochemical Synthesis of Nanostractured porous materials using Liquid Crystal and Colloidal Templates and their Magnetic and Optical properties.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The objective of this thesis is to synthesise new classes of nanostructured porous materials that have ordered pore structures on multiple and vastly different length scales for improved catalytic, magnetic and optical properties. This is achieved by electrochemical deposition using two different templating approaches, lyotropic liquid crystalline and colloidal templates. In the first approach, nanostructured metals such as cobalt, copper and lead with high degrees of mesoscopic ordering and different phase structures, were prepared by the electrochemical reduction of the metal ions dissolved on the aqueous domain of the hexagonal (H), cubic (I) or lamella (Lα) liquid crystalline phases of Brij 56 and Brij 78 surfactants. The perodicities and pore diameters of the resulting mesoporous meals are varied in a controlled way over the range from 5 to 11 nm. This was achieved by changing the alkyl chain length of the surfactant or by the addition of an hydrophobic agent. The resulting nanostructured mesoporous cobalt film was shown to behave as a hard magnet in comparison to bulk polycrystalline cobalt.
In the second templating approach, materials such as gold, platinum, cobalt, palladium, lead, nickel, nickel iron alloy, lead oxides and conducting polymer films with highly ordered macroporous structures were prepared by the electrochemical deposition within the interstitial spaces between polystyrene latex spheres assembled on conducting substrates. After removing the sphere templates, the resulting films show well-formed, regular, two- and three-dimensional macroporous networks consisting of spherical pores arranged in a highly ordered face centred cubic (fcc) structure. The spherical voids are interconnected by a series of smaller windows that form an open porous structure embedded in the material framework.
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Published date: 2001
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Local EPrints ID: 464519
URI: http://eprints.soton.ac.uk/id/eprint/464519
PURE UUID: fa9d2224-9037-4b32-9312-dececb3154fe
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Date deposited: 04 Jul 2022 23:43
Last modified: 04 Jul 2022 23:43
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Author:
Mohamed Ali M.A Ghanem
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