Browsing Physics by Title

Now showing items 1-20 of 104

Analysis of energy resources - modelling a path towards the hydrogen value

Hanley, Emma Sarah (University of Limerick, 2015)

The world is transitioning to a decarbonised economy, less than 300 years after the emergence of the industrial revolution. There is widespread acceptance for this transition due to accelerating climate change, increasing ...
An analysis of germanium-silicon/silicon strained superlattice structure using convergent beam electron diffraction

Mogili, Naga Vishnu V; Tanner, David A.; Nakahara, S (Wiley & Sons, 2016)

Strained superlattices (SSLs) are typically found inside the p-n junction area of semiconductor devices and consist of very thin alternating layers of different material. There exists a small lattice mismatch between these ...
Analysis of skin recovery from mechanical indentation using diffuse lighting and digital imaging

Clancy, Neil T.; Leahy, Martin J.; Nilsson, Gert E.; Anderson, Chris (Society of Photo‑Optical Instrumentation Engineers, 2007)

Skin behaves as a viscoelastic material, having mechanical properties composed of elastic and fluid components. Upon indentation, the fibres are stretched and fluid displaced from the compressed region. The rate of recovery ...
Annealing environment effects on the electrochemical behavior of supercapacitors using Ni foam current collectors

Jadhav, Vijaykumar V.; Kore, Ronan M.; Thorat, Nanasaheb D.; Yun, Je Moon; Ho Kim, Kwang; Mane, Rajaram S.; O'Dwyer, Colm (IOP Publishing, 2018)

Nickel (Ni) foam-based symmetric/asymmetric electrochemical supercapacitors benefit from a randomly 3D structured porous geometry that functions as an active material support and as a current collector. The surface composition ...
Assembling ordered nanorod superstructures and their application as microcavity lasers

Liu, Pia; Singh, Shalini; Guo, Yina; Wang, Jian-Jun; Xu, Hongxing; Silien, Christophe; Liu, Ning; Ryan, Kevin M. (2017)

Herein we report the formation of multi-layered arrays of vertically aligned and close packed semiconductor nanorods in perfect registry at a substrate using electric field assisted assembly. The collective properties of ...
Capturing the embryonic stages of self-assembly - design rules for molecular computation

Nirmalraj, Peter N.; Thompson, Damien; Riel, Heike E. (Nature Publishing Group, 2015)

The drive towards organic computing is gaining momentum. Interestingly, the building blocks for such architectures is based on molecular ensembles extending from nucleic acids to synthetic molecules. Advancement in this ...
Collective electronic excitations in the ultra violet regime in 2-D and 1-D carbon nanostructures achieved by the addition of foreign atoms

Bangert, Ursel; Pierce, W.; Boothroyd, C.; Pan, C.-T.; Gwilliam, R. (Nature Publishing Group, 2016)

lasmons in the visible/UV energy regime have attracted great attention, especially in nano-materials, with regards to applications in opto-electronics and light harvesting; tailored enhancement of such plasmons is of ...
Communication-observation of arrhenius behavior of catholyte stability in vanadium flow batteries

Oboroceanu, Daniela; Quill, Nathan; Lenihan, Catherine; Ní Eidhin, Deirdre; Albu, Sergiu P.; Lynch, Robert P.; Buckley, Noel (Electrochemical Society, 2016)

The stability of typical vanadium flowbattery (VFB) catholytes with respect to precipitation of V2O5 was investigated at temperatures in the range 30–60◦C. In all cases a precipitate formed after an induction time, which ...
Complete synthesis of germanium nanocrystal encrusted carbon colloids in supercritical CO2 and their superhydrophobic properties

Barrett, Christopher A.; Singh, Ajay; Murphy, Joseph A.; O'Sullivan, Catriona; Buckley, D.N.; Ryan, Kevin M. (American Chemical Society, 2011)

Colloidal carbon spheres were synthesized by the carbonization of squalane, a nonvolatile hydrocarbon solvent, in supercritical carbon dioxide. Precise pressure modulation of the fluid medium led to size controlled growth ...
Compositional characterisation of metallurgical grade silicon and porous silicon nanosponge particles

Chadwick, Edward G.; Mogili, Naga Vishnu V.; O'Dwyer, Colm; Moore, Jimmy D.; Fletcher, John S.; Laffir, Fathima R.; Armstrong, Gordon; Tanner, David A. (Royal Society of Chemistry, 2013)

Porous silicon is generally achieved through electro-chemical etching or chemical etching of bulk silicon in hydrofluoric acid based solutions. The work presented here explores the effect of a chemical etching process on ...
Concept mapping in physics in an Irish university: an investigation into the application of the tool with particular reference to its relevance to problem solving and the use of scientific language

Broggy, Joanne (University of Limerick, 2010)

Irish students’ interest and enjoyment of science deteriorates as they progress through formal education and subsequently enrolments in the physical sciences at second and third level education are low. Research in science ...
Controlling protein surface orientation by strategic placement of oligo-histidine tags

Wasserberg, Dorothee; Cabanas-Danés, Jordi; Prangsma, Jord; O'Mahony, Shane; Cazade, Pierre-Andre; Tromp, Eldrich; Blum, Christian; Thompson, Damien; Huskens, Jurriaan; Subramaniam, Vinod; Jonkheijm, Pascal (American Chemical Society, 2017)

We report oriented immobilization of proteins using the standard hexahistidine (His6)-Ni2+:NTA (nitrilotriacetic acid) methodology, which we systematically tuned to give control of surface coverage. Fluorescence microscopy ...
Controlling the direction of rectification in a molecular diode

Yuan, Li; Nerngchamnong, Nisachol; Cao, Ling; Hamoudi, Hicham; del Barco, Enrique; Roemer, Max; Sriramula, Ravi K.; Thompson, Damien; Nijhui, Christian A. (Nature Publishing Group, 2018)

A challenge in molecular electronics is to control the strength of the molecule–electrode coupling to optimize device performance. Here we show that non-covalent contacts between the active molecular component (in this ...
Core materials for high frequency VRM inductors

Kelly, Sean; Collins, Christina; Duffy, Meave; Rhen, Fernando M.F.; Roy, Saibal (IEEE Computer Society, 2007)

The application of PCB integrated electroplated cores for VRM inductors is proposed, where the motivation is to increase frequencies beyond 1 MHz so that VRM transient response can be improved. It is shown that electroplated ...
Defocus image contrast in hexagonally-ordered mesoporous material

Nakahara, S; Tanner, David A.; Hudson, D.A; Magner, S; Redington, E; Hodnett, Benjamin K. (Royal Society of Chemistry, 2011)

A transmission electron microscope was used to characterize a powder form of hexagonally-ordered mesoporous silica material. The structural symmetry built into this amorphous material allowed one to obtain three characteristic ...
Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Rhen, Fernando M.F.; Roy, Saibal (American Institute of Physics, 2008)

The magnetic properties of electrodeposited CoNiFe films with thicknesses varying from 0.20 to 10 µm were studied. The films show a single face-centered-cubic CoNiFe phase with grain sizes ranging from 23 to 29 nm. The ...
Design & development of a galvanometer inspired dual beam optical coherence tomography system for flow velocity quantification of the microvasculature

McElligott-Daly, Susan; Jonathan, E.; Leahy, Martin J. (Society of Phyto-Optical Instrumentation Engineering, 2011)

This paper reports initial experimentation of a dual beam flow velocity estimation setup based on optical coherence tomography (OCT) for biomedical applications. The proposed work incorporates a low cost switching mechanism ...
The design and implementation of a peer learning programme in physics utilising undergraduate peer leaders: an in-depth investigation into the effect of participation and the experience of the peer leaders

McClelland, George; Johnston, Jennifer (University of Limerick, Department of Physics, 2010)

Physics Education Research (PER) has shown that students leave the physics classroom holding the same misconceptions about physics they had when they entered. PER has demonstrated that these misconceptions are often deeply ...
The design, development and application of a dual-beam spectral-domain optical coherence tomography system for the non-invasive assessment of vascular dynamics by statistical means

McElligott-Daly, Susan (University of Limerick, 2013)

This assertion underscores the importance of haematological dynamic assessment, which can benefit greatly from non-invasive high-resolution imaging of blood flow especially at the microvascular level. This importance is ...
Development of a workable radiopaque rare earth doped nitinol

Butler, James (University of Limerick, 2011)

This thesis details the results obtained from an extensive study on the development of a workable radiopaque rare earth doped NiTi alloy through a traditional ingot melting (IM) route and a powder metallurgy (PM) route. ...

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