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Full-Text Articles in Physical Sciences and Mathematics
Promoting Learning Through Peer Group Work, Christine O'Connor, Renli Ma
Promoting Learning Through Peer Group Work, Christine O'Connor, Renli Ma
Conference Papers
The session aimed to help the Summer School participants develop tasks and assessment strategies of peer group work in their own teaching.
The Determination Of Environmentally Important Metals In Marine Sediments, Linda Tyrrell
The Determination Of Environmentally Important Metals In Marine Sediments, Linda Tyrrell
Masters
Surface sediment samples were collected at sites within the Rockall Through at water depth ranges from 700 – 2774 metres. The study area was predefined by the availability of samples. Samples were collected by the British Geological Survey during their gravity core survey undertaken in 1998. Methods were optimised and validated for lead, cadmium, chromium, copper, nickel, zinc, lithium and aluminium using atomic absorption spectroscopy following total digestion, and for mercury, using cold vapour atomic fluorescence spectroscopy following partial digestion. The measured metal concentration were normalised to Li to compensate for the influence of natural variability in the concentration of …
Photocontrol Of Upper And Lower Rim Complexation Of Neutral And Cationic Species By P-Tert-Butylcalix[4]Arene Tetraethyl Ester, Mary Deasy, Bernadette Creaven, Brian A. Murray, Catherine Mckenna, Darren Tobin
Photocontrol Of Upper And Lower Rim Complexation Of Neutral And Cationic Species By P-Tert-Butylcalix[4]Arene Tetraethyl Ester, Mary Deasy, Bernadette Creaven, Brian A. Murray, Catherine Mckenna, Darren Tobin
Articles
A number of sodium salt complexes of p-tert-butylcalix[4]arene tetraethyl ester, 1, were isolated both with and without upper-rim encapsulated solvent. Selective decomplexation of lower rim bound sodium cations and upper rim encapsulated solvent molecules could be successfully achieved using low pressure light sources. Oxidation of the counter anion at the lower rim of p-tert-butylcalix[4]arene tetraethyl ester triggered both the upper and lower rim decomplexation process. The extent of decomplexation at both rims is controlled both by the nature of the counter-anionic species at the lower rim and by the fate of the photoproducts generated. The calixarene host …
Optimization Of An Acrylamides-Based Photopolymer For Reflection Holographic Recording, Raghavendra Jallapuram
Optimization Of An Acrylamides-Based Photopolymer For Reflection Holographic Recording, Raghavendra Jallapuram
Doctoral
Photopolymers have been the subject of special attention in the last two decades. The advantage of being self-developing makes them a practical alternative to silver halide photographic emulsions in holographic interferometry applications. This thesis is aimed at understanding diffusion properties and optimization of an acrylamide-based green sensitized photopolymer material for reflection holographic recording. The composition of the photopolymer includes a green sensitive dye (erythrosine B), acrylamide (monomer), electron donor (triethanolamine) a cross linking monomer (NN’methylenebisacrylamide) and a binder (polyvinyl alcohol). On illumination with light of the appropriate wavelength the dye absorbs a photon and enters into an excited state. The …
Identification And Recovery Of An Asymmetric Calix[4]Arene Tetranitrile Derivative Using Liquid Chromatography And Mass Spectrometry, Benjamin Schazmann, Dermot Diamond
Identification And Recovery Of An Asymmetric Calix[4]Arene Tetranitrile Derivative Using Liquid Chromatography And Mass Spectrometry, Benjamin Schazmann, Dermot Diamond
Articles
A simple analytical LC-MS (Liquid Chromatography Mass Spectrometry) method and associated instrumentation has been adapted for use by the organic chemist to yield mg quantities of target compound from a reaction mixture. Calix[4]arene 3 was identified as representing 51% of total peak area of a reaction mixture containing no less than 10 components, using LC-MS. This peak corresponded to a mass of 878.8, equivalent to a complex of 3 and an ammonium cation. Molecular models further rationalise this observation by showing that the asymmetric binding cavity of 3 is suitable for binding tetrahedral guests like the ammonium ion. By scaling …