Chemistry and Forensic Science Colloquium

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Seminars

As part of the School of Science and Technology Chemistry and Forensic Science Colloquium Dr Bob Baker, University College Dublin presents: To Uranium and Beyond: Plumbing the depths of the Periodic Table.

  • From: Wednesday 6 February 2019, 1 pm
  • To: Wednesday 6 February 2019, 2 pm
  • Location: CTLP 006, Clifton Teaching and Learning Building, Nottingham Trent University, Clifton Campus, Clifton Lane, Nottingham, NG11 8NS

Past event

Event details

As part of the School of Science and Technology Chemistry and Forensic Science Colloquium Dr Bob Baker, University College Dublin presents: To Uranium and Beyond: Plumbing the depths of the Periodic Table.

Abstract

The chemistry of the actinides has seen tremendous development over the past decade and the advancement of our understanding of the participation of the 5f and 6d orbitals in bonding has grown. To fully understand these sometimes subtle effects, advanced spectroscopic techniques must be employed. In this presentation I will detail our work in two areas where we have used such techniques.

The coordination chemistry of thorium and uranium thiocyanates has been reported [1], and I will discuss how the templating effects of cations significantly influences the electronic structure of [A]4[U(NCS)8] (A = R4N or Cs), where magnetic measurements, Inelastic Neutron Scattering and ultralow temperature X-ray and neutron crystallography at 4K, along with theoretical chemistry, have been utilised to understand this. Some related neptunium compounds will also be described.

Storage of Spent Nuclear Fuels (SNF) in geological repositories is the favoured method for disposal in a number of EU countries, but a full understanding of what happens over 106 years is required to make a robust safety case. UO2 will likely oxidise to uranyl compounds via a number of phase changes [2] and these phases can sorb radionuclides such as neptunium and therefore alter the migration rates into the near-field. I will present our work on the characterisation of a series of minerals using solid-state electrochemistry, [3] magnetic measurements and X-ray spectroscopy [4] (Figure); both techniques have the potential to give important information on the electronic structure of actinide complexes but are not currently well utilised. I will discuss the use of Eu(III) as a model for Am(III) in the sorption onto the surface of selected minerals, which has directed our efforts in 241Am(III) incorporations on tracer scales [5]. Finally the reactions of 237Np(V) with selected mineral phases have been studied by multi-element X-ray spectroscopy (Figure). Pu is a challenge to work with but I will present our recent results in this area.

This seminar is hosted by Professor John Wallis

All welcome.

For any queries please contact Dr Matthew Addicoat

Location details

Room/Building:

CTLP 006, Clifton Teaching and Learning Building

Address:

Nottingham Trent University
Clifton Campus
Clifton Lane
Nottingham
NG11 8NS

Past event

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