- EaStCHEM Colloquia
- Physics and Astronomy Colloquia
- Irvine Lectures
- Photonics Seminar
- Special Seminars
- Synthesis Seminars
- Cond Mat Seminars
- Organic Semiconductor Centre
- Theoretical Physics Discussion Group
- ScotCHEM Colloquia
- History of Mathematics
- RSC Award Lectures
- Toy List
- Special Mini-Symposium - Structural Chemistry at Central Facilities
- Strong coupling seminars
- Materials and Energy Special Seminars
- ScotCHEM Polymer and Soft Materials Conference
Viewing upcoming talks containing the keyword: 19
Physics and Astronomy Colloquia
Noninvasive spectrophotometry and a phototherapy as a section of the modern medical and physics research in Moscow Regional Research and Clinical Institute "MONIKI"
Speaker: Dr D A Rogatkin (Moscow Regional Research and Clinical Institute "MONIKI")
Modern semiconductor lasers as well as LEDs are widely used in medicine today. One of the biggest areas of their application are noninvasive (in vivo, in situ) diagnostics, based on principles of spectrophotometry and laser spectral analysis, and a phototherapy. This presentation is a review of selected studies in this field carried out in one of the oldest and largest Russian medical research and practical center – Moscow Regional Research and Clinical Institute (MONIKI) named after M. F. Vladimirskiy. All studies were aimed at the development and application of combined noninvasive spectrophotometry diagnostic technique in real clinical practice and in different fields of medicine, in phototherapy, for example. The specially devised multifunctional laser diagnostic system “LAKK-M” was used as a noninvasive diagnostic tool in the majority of these studies, allowing a combination of several diagnostic methods such as laser fluorescence spectroscopy, laser Doppler flowmetry, tissue reflectance oximetry, etc. in a single experiment. It allows for physicians a complex examination of the so-called blood microcirculation system - one of the primary object, which is affected in tissues at a phototherapy. All these diagnostic methods, for example, didn’t confirm the stimulation effect on the blood microcirculation in skin or mucosa at a Low Level Laser Irradiation (LLLI) with the power density below 50 mW/cm2 and irradiation time up to 5-6 minutes. Above this threshold the heating on 0,8…1 0C of tissue in the field of irradiation and the corresponding synchronous increase of all parameters of microhemodynamics were observed. The report also discusses the problems and prospects of development of researches on the blood microcirculation with the use of the non-invasive spectrophotometry.
On: April 1, 2016 From: 10h00 To: 11h00View talk
Speaker: Daniel Leznoff (Simon Fraser University, Canada)
The spectroscopic and redox properties of metallophthalocyanines (MPcs) are active areas of research. MPc complexes can be successively reduced using chemical, electrochemical, or photochemical methods to give rise to species containing reduced Pc3-, Pc4-, Pc5-, or Pc6-ligands. These species are usually generated and characterized in situ and have only very rarely been isolated for structural characterization, likely due to the extreme air and moisture sensitivity of these complexes. In particular, there are few examples of phthalocyanines with early-transition metals - despite their rich reactivity in organometallic chemistry - and thus we focused on this underdeveloped area of the periodic table with respect to new PcM complexes.
Using rigorously air- and moisture-free conditions, the isolation and structural characterization of highly reduced Pcn- (n=3,4,5) complexes – among the first ever reported - with early transition-metals, including Sc, Zr, Nb and Cr, will be described. The electronic structure of these materials will also be examined, using a combination of UV-vis-NIR and ESR spectroscopies, X-ray diffraction studies and DFT calculations.
Our efforts to prepare and characterize very rare mononuclear PcAu(II) complexes based on a prior report[2a] will also be discussed, in which we present the first synthesized and structurally characterized gold-containing phthalocyanines.[2b]
1. E.W.Y. Wong, C.J. Walsby, T. Storr, D.B. Leznoff, Inorg. Chem., 2010, 49, 3343-3350; E.W.Y. Wong, D.B. Leznoff, J. Porph. Phthalo., 2012, 16, 154-162; R. Platel, W. Zhou, T.T. Tasso, T. Furuyama, N. Kobayashi, D.B. Leznoff, Chem. Commun., 2015, 5986-89; W. Zhou, R. Platel, T.T. Tasso, T. Furuyama, N. Kobayashi, D.B. Leznoff, Dalton Trans., 2015, 44, 13955.
2. (a) A. MacCragh and W.S. Koski, J. Am. Chem. Soc., 1965, 87, 2496. (b) E.W.Y. Wong, A. Miura, M.D. Wright, Q. He, C.J. Walsby, S. Shimizu, N. Kobayashi and D.B. Leznoff Chem. Eur. J. 2012, 18, 12404.
On: April 6, 2016 From: 15h30 To: 16h30View talk
Physics and Astronomy Colloquia
Speaker: Prof Cait MacPhee (University of Edinburgh, Biomolecular Physics)
Janus particles are micro- or nano-scale particles whose surfaces have two or more distinct physical properties. Such asymmetry results in interesting self-assembly properties, but homogeneous Janus particles can be difficult to synthesize. The protein BslA (Bacterial Surface Layer A) is a small (~4 nm) protein produced by the bacterium acillus subtilis that has a hydrophilic ‘body’ to which is appended a surface-exposed hydrophobic ‘cap’. These properties allow the ellipsoidal protein to partition to oil- and air-water interfaces where it self-assembles to form a robust, elastic, and highly hydrophobic film. We have investigated the behaviour of BslA using a combination of biophysical experiments and multiscale simulations. I will describe how BslA provides an intriguing example of a colloidal particle with switchable, environmentally-responsive physical features that have potential applications in nanoscale self-assembly.
On: April 8, 2016 From: 10h00 To: 11h00View talk
Speaker: David Wales (Cambridge)
The potential energy landscape provides a conceptual and computational framework for investigating structure, dynamics and thermodynamics in atomic and molecular science. This talk will summarise new approaches for global optimisation, quantum dynamics, the thermodynamic properties of systems exhibiting broken ergodicity, and rare event dynamics. Applications will be presented that range from prediction and analysis of high-resolution spectra, to coarse-grained models of mesoscopic structures. Selected Publications: D.J. Wales, Curr. Op. Struct. Biol., 20, 3-10 (2010) D.J. Wales, J. Chem. Phys., 130, 204111 (2009) B. Strodel and D.J. Wales, Chem. Phys. Lett., 466, 105-115 (2008) D.J. Wales and T.V. Bogdan, J. Phys. Chem. B, 110, 20765-20776 (2006) D.J. Wales, Int. Rev. Phys. Chem., 25, 237-282 (2006) D.J. Wales, "Energy Landscapes", Cambridge University Press, Cambridge, 2003
On: April 13, 2016 From: 15h30 To: 16h30View talk
Physics and Astronomy Colloquia
Speaker: Prof Tim Harries (University of Exeter)
Massive stars (those greater than 20 solar masses) are hugely important in galactic ecology, enriching them chemically and providing strong feedback effects via radiation, stellar winds and supernovae. However, the process by which massive stars form is less well understood than that of lower-mass stars, both observationally, because massive protostars are rare and difficult to observe, and theoretically because radiation feedback has a much stronger influence on the dynamics than it does for solar-mass objects.
I present new radiation-hydrodynamical (RHD) simulations of massive star formation that treat the radiation feedback with unprecedented microphysical detail. The simulations following the collapse of a molecular cloud into a protostar with a circumstellar disc and a bipolar outflow. I show that by computing synthetic observables directly from the RHD models it is possible to
test the simulations against a variety of diagnostics, from molecular lines to interferometry.
On: April 15, 2016 From: 10h00 To: 11h00View talk
Speaker: Peter Skabara (Strathclyde)
Well-defined and monodisperse oligomers can be considered to be intermediate of conjugated ‘small molecules’ and polymers, and can feature the best of both sets of attributes. Precise HOMO/LUMO energy levels, high thermal stability, good solubility and excellent film-forming properties are common features that can be achieved in such materials. Moreover, the precise structure of the material is known (compared with polydisperse systems) and this makes our understanding of structure-property relationships much easier to establish.
The synthesis and properties of some monodisperse conjugated star-shaped and linear structures will be presented in this talk, along with their application in organic lasers, sensors, electrogenerated chemiluminescence, light emitting diodes and LiFi communications.
On: April 20, 2016 From: 15h30 To: 16h30View talk