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Holmes, Justin D. O'Callaghan, John M. Science Foundation Ireland 2010-06-02T12:01:59Z 2010-06-02T12:01:59Z 2010 2010-04 2010-04 The work described in this thesis reports the structural changes induced on micelles under a variety of conditions. The micelles of a liquid crystal film and dilute solutions of micelles were subjected to high pressure CO2 and selected hydrocarbon environments. Using small angle neutron scattering (SANS) techniques the spacing between liquid crystal micelles was measured in-situ. The liquid crystals studied were templated from different surfactants with varying structural characteristics. Micelles of a dilute surfactant solution were also subjected to elevated pressures of varying gas atmospheres. Detailed modelling of the in-situ SANS experiments revealed information of the size and shape of the micelles at a number of different pressures. Also reported in this thesis is the characterisation of mesoporous materials in the confined channels of larger porous materials. Periodic mesoporous organosilicas (PMOs) were synthesised within the channels of anodic alumina membranes (AAM) under different conditions, including drying rates and precursor concentrations. In-situ small angle x-ray scattering (SAXS) and transmission electron microscopy (TEM) was used to determine the pore morphology of the PMO within the AAM channels. PMO materials were also used as templates in the deposition of gold nanoparticles and subsequently used in the synthesis of germanium nanostructures. Polymer thin films were also employed as templates for the directed deposition of gold nanoparticles which were again used as seeds for the production of germanium nanostructures. A supercritical CO2 (sc-CO2) technique was successfully used during the production of the germanium nanostructures. Not peer reviewed Accepted Version application/pdf O'Callaghan, J.M., 2010. Small angle scattering characterisation of micellar systems and templated architectures. PhD Thesis, University College Cork. https://hdl.handle.net/10468/177 en University College Cork O'Callaghan JM, Copley MP, Hanrahan JP, Morris MA, Steytler DC, Heenan RK, Staudt R, Holmes JD, 2008. Supercritical fluid swelling of liquid crystal films. Langmuir, 24(13), pp.6959-64. doi: 10.1021/la800073t John M. O'Callaghan, Nikolay Petkov, Mark P. Copley, Donna C. Arnold, Michael A. Morris, Heinz Amenitsch, and Justin D. Holmes, 2010. Time-resolved SAXS studies of periodic mesoporous organosilicas in anodic alumina membranes. Microporous and Mesoporous Materials 130, (1-3), pp. 203-207. doi:10.1016/j.micromeso.2009.11.007 John M. O'Callaghan, Hugh McNamara, Mark P. Copley, John P. Hanrahan, Michael A. Morris, David C. Steytler, Richard K. Heenan and Justin D. Holmes, 2010. Swelling of Ionic and Nonionic Surfactant Micelles by High Pressure Gases. Langmuir 26 (11), pp 7725–7731. doi: 10.1021/la904464k http://library.ucc.ie/record=b1999321~S0 ©2010, John M. O'Callaghan http://creativecommons.org/licenses/by-nc-nd/3.0/ Small-angle neutron scattering Mesoporous silica Surfactant liquid crystals Small-angle x-ray scattering Micelles Mesoporous materials Liquid crystals Small angle scattering characterisation of micellar systems and templated architectures Doctoral thesis Doctoral PhD. Scienceinfo:eu-repo/semantics/openAccess