Physics (Theses and Dissertations): Recent submissions
Now showing items 301-320 of 458
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Local investigations of switchable rotaxane molecules at interfaces using atomic force microscopy
(Trinity College (Dublin, Ireland). School of Physics, 2008)Rotaxane molecules (interlocked molecules consisting of two parts bonded mechanically) have an inherent multi-stability. The relative positions of the submolecular components can be altered through external stimuli, a ... -
Stability and motion of foams and films in confined geometries
(Trinity College (Dublin, Ireland). School of Physics, 2005)The last 20 years of research in the physics of foams display the development of a thorough understanding of dry and static foams. In the realm of wet and dynamic foams, however, many interesting and puzzling effects have ... -
Nonlinear optical extinction in organic and inorganic nanomaterials
(Trinity College (Dublin, Ireland). School of Physics, 2007)This thesis will focus on the nonlinear optical dissipation of high intensity nanosecond laser irradiation by polymer-phthalocyanine films and nano-structured dispersions. The nonlinear optical investigation of a selection ... -
Radioactivity from building materials in the Republic of Ireland
(Trinity College (Dublin, Ireland). School of Physics, 2006)This thesis presents the findings of a study undertaken to determine the radioactivity present in building materials in the Republic of Ireland. A total of 70 samples of commonly used building materials was collected from ... -
Characterisation of laser produced plasmas
(Trinity College (Dublin, Ireland). School of Physics, 2006)This thesis describes the apphcation of planar Langmuir probes in laser produced plasmas. The influence of the ion flow on the probe behaviour and its effect on the measured plasma parameters has been investigated for ... -
Near-infrared luminescent polymer amplifiers and microlasers
(Trinity College (Dublin, Ireland). School of Physics, 2008)Near-infrared optical gain in luminescent polymeric slab asymmetric waveguides has been investigated by use of amplified spontaneous emission. Upon nanosecond photopumping, the waveguides have shown a small-signal gain ... -
Computational studies of the structure and dynamics of packings of grain and bubbles
(Trinity College (Dublin, Ireland). School of Physics, 2006)Since the dawn of civilization people have been intrigued by packing problems. They have a great significance in the practicalities of our everyday lives, with people always seeming to try to find more efficient ways of ... -
The influence of the laser induced plasma in the pulsed laser depositon of ZnO
(Trinity College (Dublin, Ireland). School of Physics, 2005)The thesis is divided in three main sections, two of them Chapter 2 and 3 are devoted to the study and analysis of the laser produced plasma. Finally in the third section (Chapter 4) the conclusions obtained in the first ... -
Ultrafast spectroscopy of DNA binding systems
(Trinity College (Dublin, Ireland). School of Physics, 2004)Ultrafast transient spectroscopy was used to investigate the properties of various systems which bind to DNA. Visible and IR pump and probe was employed to elucidate excited state process of the DNA binding complexes. Ultra ... -
Rheological and local fluid dynamics in foams
(Trinity College (Dublin, Ireland). School of Physics, 2005)This thesis explores the physics of foams, particularly those that are wet (i.e. have a high liquid fraction). The properties which are measured here relate to structure, drainage and rheology. We have performed the first ... -
Star formation : the generation and propagation of jets from young stars
(Trinity College (Dublin, Ireland). School of Physics, 2006)While much progress has been made in recent decades, there are many outstanding questions about the star formation process, including how jets/outflows from young stars are launched and travel away from their source. This ... -
Applications of statistical physics to economics : distributions of wealth and correlations of financial data
(Trinity College (Dublin, Ireland). School of Physics, 2009)Over the last decade the study of economic and financial problems by the physics community has become very popular. Econophysics describes the application of tools from statistical physics to the study of problems in ... -
A study of spin polarization in potential half-metals
(Trinity College (Dublin, Ireland). School of Physics, 2006)The study presented in this thesis has been concerned with measuring spin polarisation in magnetic materials using two methods: i) measurement of magnetoresistance in room temperature point contacts and ii) Point Contact ... -
STM study of the (001) and (110) surfaces of magnetite
(Trinity College (Dublin, Ireland). School of Physics, 2005)In this thesis the surface of single crystals and thin films of magnetite (001) and (110) have been studied by scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS), Auger electron spectroscopy (AES) and ... -
Nanopatterning magnetic materials - Cr/Mo(110) epitaxial system and Fe3O4(111) surface
(Trinity College (Dublin, Ireland). School of Physics, 2006)This thesis presents the investigation of the Cr/Mo(110) epitaxial interface. The study combines experimental techniques in the form of scanning tunneling microscopy (STM), low energy electron diffraction (LEED), and Auger ... -
Understanding DNA dispersed single-walled carbon nanotube systems
(Trinity College (Dublin, Ireland). School of Physics, 2008)HiPCO Single-walled carbon nanotubes (SWNTs) have been dispersed in water using a variety of different nucleic acids. An extensive study of the factors controlling the quality of the DNA-SWNT dispersions was carried out, ... -
Optical investigations of the magnetic properties of iron nanostructures grown on tungsten(110)
(Trinity College (Dublin, Ireland). School of Physics, 2007)The structural and magnetic properties of ultra-thin Fe films and Fe nanostripes grown on vicinal W(110) are studied using Reflectance Anisotropy Spectroscopy (RAS), and the non-linear optic techniques of Second Harmonic ... -
Mechanical properties of biopolymers reinforced with carbon nanotubes
(Trinity College (Dublin, Ireland). School of Physics, 2008)Three biopolymers; poly(methyl methacrylate) (PMMA); poly(L-lactic acid) (PLLA); poly(vinyl alcohol) (PVA) and an engineered spider silk (Biosteel ®) have been independently doped with carbon nanotubes. PM MA was functionalised ... -
Preparation and characterisation of carbon nanotube films and composites
(Trinity College (Dublin, Ireland). School of Physics, 2008)A simple method of carbon nanotube (NT) composite preparation has been demonstrated that produces wide ranging and extremely high carbon nanotube mass fraction, mf, composites with minimal reagregation of the nanotubes (up ... -
Dispersions and solutions of single walled carbon nanotubes
(Trinity College (Dublin, Ireland). School of Physics, 2008)Large scale exfoliation of single walled carbon nanotubes (SWNTs) has been shown in various media. Debundling of SWNTS has been demonstrated by dilution of nanotube dispersions. On making the initial dispersions, large ...
