MAX IV is organising a series of scientific seminars that will take place on Mondays at 13.45h CET. Click below for dates. These Zoom talks will feature users discussing scientific results and possible future experiments at MAX IV beamlines. Future talks will be published on the MAX IV website when they are finalised.
Programme
Monday 28 March 2022, 13:45 CET
Speaker: Dr Jaanus Kruusma, Institute of Chemistry, University of Tartu, Estonia
Host: Dr Antti Kivimäki, FinEstBeAMS beamline manager
Kerwords: synchrotron in situ X-ray photoelectron spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, micro-mesoporous carbon, room-temperature ionic liquid
Room-temperature ionic liquids (RTILs) are known as “green” low volatility inflammable ionic solvents applied in organic chemistry, in the reduction and deposition of electrochemically active substances (metals and semi-metals) and as potential electrolytes in the electrical energy storage systems and electrochemical power sources due to their relatively high conductivity, low flammability and very wide range of ideal electrochemical polarisability. Due to their very low vapour pressure (ca. 10-8…10-9 mBar) at 20…25 °C, RTILs can be investigated in the high vacuum conditions. The XPS is used to measure the atoms inner core electrons binding energies that are influenced by the chemical nature of the atom(s) next and thus are characteristic. That enables us to make assumptions about the chemical origin of the photoelectron signal. Fine tuneable energy synchrotron X-rays provide a very high resolution and sensitivity for the XPS analysis and enable to detect and reduce the disturbance of various artefacts (e.g. charging effects, Auger peaks and shake-up phenomenon). Polarising the support (i.e. the working electrode material, e.g. micro-mesoporous carbon) electrochemically (electrically) in the XPS measurement chamber and then changing the support (i.e. the working electrode) electrochemical potential stepwise enables us to record in situ the X-ray photoelectron spectra for each electrochemical potential applied and for all chemical elements composing the RTIL. Thus, we can record the XPS vs. the electrochemical potential applied to the support (i.e. the working electrode). Constructing the inner core electrons binding energy vs. the electrochemical potential applied to the support material relationships we can make assumptions about the character of the adsorption of RTILs at the support material at various electrochemical potentials applied. The electrochemical measurements (i.e. cyclic voltammetry and electrochemical impedance spectroscopy measurements) were conducted to collect additional supporting information about the electrochemical behaviour of the RTIL | electrode material (support) system investigated.
Monday 11 April 2022, 13:45 CET
Speaker: Prof Ben Boyd, Department of Pharmacy, University of Copenhagen (Denmark) & Monash Institute of Pharmaceutical Sciences (Australia)
Host: Dr Selma Maric, Coordinator for Education and Training, User Office
Monday 18 April 2022, 13:45 CET
EASTER MONDAY
About ScientiFika
The initiative aims to share knowledge and stimulate enthusiastic discussions on synchrotron research and methods developed at MAX IV. These shall be a channel to learn more about our facility, strengthen collaborations, bring communities together and promote cooperation and interdisciplinarity.
The speakers will be MAX IV past, current and potential future users, as well as MAX IV staff; on the other hand, welcome attendees are members of the broad scientific community: scientists from the speaker´s home institution, of Swedish and international universities as well as MAX IV and other light sources staff.
Please reach us through the email of the useroffice@maxiv.lu.se in case you have any comments or suggestions regarding the series.
We look forward to seeing you online and hope you enjoy the talks!