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Viewing upcoming talks containing the keyword: 19
Speaker: Dr Alexey Ganin (University of Glasgow)
Solid state electrocatalysts fo r hydrogen evolution from water Dr. Alexey Ganin, School of Chemistry, University of Glasgow, United Kingdom Abstract Production of hydrogen by electrochemical water splitting is an attractive sol ution for utilizing the excess of electrical energy from green sources and storing the electricity that otherwise would be wasted as chemical fuels for later use on demand. However, realistic current densities in water splitting systems coupled to renewabl e sources (such as solar cells) are low. At such low current densities operation demands high -surface area electrodes and high catalyst loading. The choice of electrocatalysts at the electrode is critical as this will affect the efficiency, lifetime and co st of the water splitting apparatus. Therefore, search for electrocatalysts composed of earth -abundant elements is important if we aim to produce hydrogen cost effectively.
In this talk I will present three approaches used in my research group to improve t he efficiency and stability of hydrogen evolution electrocatalysts. The first approach will describe the way to maximise the durability of the highly active molecular catalyst by immobilizing it at the surface of the glassy carbon electrode. This will be i llustrated by metal -chalocoxides compounds and will also contain a comprehensive explanation (backed by DFT calculations) on how catalytic activity can be altered for achieving even better performance. The second part of the talk will deal with an approach which utilizes the ability of MoTe2 to change its reactivity depending on polymorphic transition. Furthermore, I will demonstrate that the metallic polymorph can be activated by the use of physical stimulus consisting of number of short cycles, leading to a dramatic improvement in catalytic performance. Finally, by example of novel nitride -based catalysts I will demonstrate the role of non - metal on improving catalysts stability. Download PDF
On: October 2, 2019 From: 15h30 To: 16h30View talk
Speaker: Prof Paul Pringle (Bristol)
Hydrophosphination: an old reaction with some new twists Consultation of any textbook on organometallic chemistry or homogeneous catalysis would reveal how important tertiary phosphine ligands have been to the development of both of these fields over that last half century. The enormous variety of tertiary phosphines that are accessible means that the properties of the metal complexes and catalysts that they form can be controlled and finessed to an unparalleled degree. The synthesis of tertiary phosphines typically involves the use of highly reacti ve phosphorus nucleophiles or electrophiles in reactions that are stoichiometric, produce salt waste and are not amenable to the incorporation of reactive functionalities in the product ligands. Hydrophosphination offers an attractive alternative since it is 100% atom efficient and, when Pt(0) -catalysed, is tolerant of many functional groups including esters, nitriles or amides. Surprisingly, we have found that this catalysis is also applicable to the synthesis of diphosphines despite the potential for cata lyst inhibition by the powerfully chelating products. The functionalised diphosphines that we have produced via hydrophosphination can be bioconjugated to peptides or carbohydrates to give radiolabelled complexes suitable for medical imaging. Download PDF
On: October 9, 2019 From: 14h00 To: 15h00View talk
Physics and Astronomy Colloquia
Speaker: Prof. Martin Hendry (University of Glasgow)
Gravitational waves are ripples in spacetime, produced by the most
violent events in the cosmos: exploding stars, colliding black holes, perhaps even the Big Bang itself. Since September 2015, when the twin LIGO (Laser Interferometer Gravitational-Wave Observatory) instruments made the first-ever direct detection of gravitational waves from the merger of two massive black holes more than a billion light years distant, the LIGO Scientific Collaboration and the Virgo Collaboration have reported the confirmed detection of ten further compact binary mergers - including the merger of two neutron stars detected in August 2017 that was also observed across the entire electromagnetic spectrum. Moreover since April 2019 the LIGO and Virgo detectors have been engaged in their third observing run, with enhanced sensitivity, and during the first four months of “O3” they reported a further 22 candidate detections. The gravitational-wave window on the cosmos is now well and truly open!
In this lecture I will review the latest LIGO and Virgo observations of the mergers of binary black holes and neutron stars – and how these observations are shaping and improving our understanding of strong gravity, cosmology and fundamental physics. I will then outline the gravitational-wave “roadmap” for the coming decades, including the planned LIGO and Virgo observing runs and upgrades, the addition of KAGRA and LIGO India to the ground-based network, the “ third generation” ground-based interferometers proposed for the 2030s and the enormous potential of spaceborne detectors that will probe the lower frequency gravitational-wave spectrum. I will describe how these observations should provide a much deeper and more complete view of the Gravitational Universe over the next two decades, offering new and complementary insights into a wide range of astrophysical questions – from the origin of black holes and the evolution of galaxies to the nature of dark matter and dark energy and perhaps even the fundamental properties of spacetime itself.
On: October 11, 2019 From: 10h00 To: 11h00View talk
Speaker: Prof Kyoko Nozaki (University of Tokyo)
Homogeneous Catalysis for Organic Synthesis and Polymer Synthesis Kyoko Nozaki Department of Chemistry and Biotechnology, The University of Tokyo Hongo 7 -3-1, Bunkyo -ku , Tokyo 113 -8656 Japan Email: nozaki @ chembio.t.u -tokyo.ac.jp
In order to avoid the formation of undesired by -products, development of catalytic reactions affording the desired compound as a sole product is highly desired. We have developed catalysts applicable for small molecules and macromolecules. The former is recognized as organic synthesis which finds its applications as intermediates for fine chemicals while the latter are widely used in bulk material synthesis. The catalysts we studied are organometallic complexes consist of metals with catalytic activities and ligands with ability to control the reactions. Three examples are shown as below. (1) Asymmetric synthesis of chir al polymers 1,2 Two examples are presented for the synthesis of optically active polymers with main -chain chirality from achiral monomers using chiral metal -complexes as catalysts. Asymmetric alternating copolymerization of α-olefins with carbon monoxide provided optically active polyketones with high enantioselectivity .
(2) Copolymeriz ation of ethylene or propylene with polar vinyl monomers 3,4,5 Aiming to expand the application range of polyolefins, metal -catalyzed copolymerization of olefins with easily available polar vinyl monomers has been intensively studied in the last decades. Here in this presentation, our contribution to the development o f coordination –insertion copolymerization of ethylene or propylene with polar vinyl monomers by palladium catalysts will be presented.
(3) Organic synthesis with polymerization catalyst 6 Propylene polymerization catalyst was successfully used for the total s ynthesis of a natural product endowed with deoxypropionate unit.
References  Review and accounts articles: (a) Nozaki,K. J. Polym. Sci., Part A: Polym. Chem ., 2004 , 42 , 215 - 221. (b) Nozaki, K. Pure Appl. Chem ., 2004 , 76 , 541 -546.  Recent publicatio ns: Nakamura, A.; Kageyama, T.; Goto, H.; Carrow, B. P.; Ito, S.; Nozaki, K. J. Am. Chem. Soc ., 2012 , 134 , 12366 -12369.  Review and accounts articles: (a) Nakamura, A.; Anselment, T. M. J.; Claverie , J.; Goodall, B.; Jordan, R. F.; Mecking, S.: Rieger, B.; Sen, A.; van Leeuwen, P. W. N. M.; Nozaki, K. Acc. Che. Res . 2013 , 46 , 1438 -1449. (b) Nakamura, A.; Ito, S.; Nozaki, K. Chem. Rev ., 2009 , 109 , 5215 - 5244. (c) Carrow, B. P.; Nozaki, K. Macromolecul es , 2014 , 47 , 2541 -2555  Recent publications: (a) Carrow, B. P.; Nozaki, K. J. Am. Chem. Soc. 2012 , 134 , 8802 –8805. (b) Nakano, R.; Nozaki, K. J. Am. Chem. Soc ., 2015 , 137 , 10934 -10937. (c) Ota, Y.; Ito, S.; Kobayashi, M.; Kitade, S.; Sakata, K.; Tayano, T.; Nozaki, K. Angew. Chem. Int. Ed ., 2016 , 55 , 7505 -7509. (d) H. Yasuda, R. Nakano, S. Ito, K. Nozaki , J. Am. Chem. Soc. 2018 , 140 , 1876 – 1883 .  X. Wang, K. Nozaki , J. Am. Chem. Soc. , 2018 , 140 , 15635 –15640 .  (a) Ota, Y.; Murayama, T.; Nozaki, K. Proc. Natl. Acad. Sci. USA , 2016 , 113 , 2857 -2861. (b) T. Murayama, K. Nozaki , Angew. Chem. Int. Ed. , 2018 , 57 , 11394 –11398 . Download PDF
On: October 16, 2019 From: 15h30 To: 16h30View talk
History of Mathematics
Speaker: Prof Deborah Kent (Drake University, )
The second half of the nineteenth century brought the golden age of eclipse expeditions. Equipped with the latest technology and dreams of glory, international observing parties trekked around the globe to find astronomical results in the solar darkness. North American eclipse paths in 1860, 1869, and 1878 especially played into the scientific agenda articulated by mid-century mathematical practitioners in the United States. As developments in photography fueled a race to capture an image of the solar corona, scientists also hoped for insight about both the size of the universe and the chemical composition of the Sun. Novel spectroscopic results from an 1868 British eclipse expedition to India further excited American hopes for ground-breaking results. In 1869, convoys travelled west on newly-completed railroad to the prairies of Iowa. Their work capitalized on new technologies and deployed legions of U.S. government mathematicians and scientists in a coordinated effort. The success and attendant publicity laid a foundation for the 1878 eclipse mania and its eventual contribution to American science.
On: October 16, 2019 From: 16h00 To: 17h00View talk
Physics and Astronomy Colloquia
Speaker: Dr Silvia Picozzi (CNR, Chieti)
The discovery of novel properties, effects or phenomena in modern materials science is often driven by the quest for the coexistence and/or coupling of several functional properties into a single system. Within this framework, I will focus on the microscopic mechanisms leading to the interplay between spin and dipolar degrees of freedom, along with their theoretical modelling. I will first address the coupling of long-range magnetic and electric dipolar orders in multiferroics, in particular in electronic ferroelectrics, where the spin/charge/orbital order induces an electric polarization. Second, I will discuss (non-magnetic) ferroelectric semiconductors, where the spin-orbit interaction leads to a tight link between Rashba spin-splitting in the electronic structure, spin-texture and electric polarization. The common denominator is to achieve the electric-field control of magnetism and, therefore, the long-sought integration of spintronics with ferroelectricity.
On: October 18, 2019 From: 10h00 To: 11h00View talk