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úterý, 13. července 2021

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New method of electronic doping to the most stubborn fluoride insulators

úterý, 13. července, 10.00 » 11.30
Globální událost
In its part addressed to chemistry community the lecture will be focused on charge transfer (redox) reactions and on compounds which show mixed or intermediate valence, in particular on electronically doped systems. Their selected applications as well as related technological breakthroughs in the XX and XXI centuries will be discussed. Stubborn resistance of metal fluorides, notably AgF2 [1] to doping, will be described. The new concept of continuous doping (charge injection) will be introduced, based on spatial separation of oxidizer and reducing agent in nanoscale [2]. The relationship of such setup to electrochemical cells, capacitors and n/p junctions will be discussed [3].

In its part addressed to physics community, consequences will be described of a novel nano-device called chemical capacitor [2] for metallization of electronic insulators and particularly for obtaining of room-TC superconductors without external pressure. Families of superconductors, including hydrides, as well as doping methods and (p,T) regimes, will be presented [3]. Metastable character of high-TC superconductors [4], in light of maximum hardness principle (from Pearson), i.e. inverse susceptibility, will be emphasized.

Literature

[1] J. Gawraczynski et al., PNAS 116(5): 1495-1500 2019.

[2] A. Grzelak, J. Lorenzana, W. Grochala, Angew. Chem. Int. Ed. Engl., 60(25): 13892-13895 2021.

[3] W. Grochala, Wiadom. Chem. (Chem. News, in Polish) 75(5-6): 755-769 2021.

[4] W. Grochala, M. Derzsi, J. Mol. Model. 24: 233 2018.

Bio

Professor Wojciech Grochala’s (ur. 1972) career has been linked to the University of Warsaw (M.Sc. 1995, Ph.D. 1998, D.Sc. 2005, prof. extraord. UW 2011, prof. titular 2014, prof. ord. UW 2016). Since 2004 r. he leads the Laboratory of Technology of Novel Functional Materials. He spent postdoctoral stays in the USA (with Roald Hoffmann at Cornell Univ.) and in the UK (with prof. Peter P. Edwards at Univ. of Birmingham). He was visiting professor at Geophysical Lab, Carnegie Institution of Washington and Cornell University. Prof. Grochala coauthors ca. 180 papers and book chapters as well as 3 international patents. He has promoted twelve PhD and lectured one hundred times at scientific institutes worldwide; he coauthored over two hundred conference contributions. His scientific interests are in materials, inorganic, physical and computational chemistry (particularly for solids) and more recently also organic chemistry. He explores new materials for hydrogen storage, atypical compounds of divalent silver, magnetic materials and compounds of noble gases (particularly the lightest ones). For several years he has been teaching to the students of humanities at Artes Liberales College. Growing exotic plants is his hobby, so is prose and poetry writing.

https://orcid.org/0000-0001-7317-5547

místnosti A243 (zasedačka ÚOCH)