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Dr. Andrew Stewart

Biography

My research centres on the applications and development of high-resolution electron microscope techniques, in particular diffraction based electron microscopy, including:
3D-Electron Diffraction Techniques (3DED) Including MicroED
4 dimensional scanning transmission electron microscopy (4D-STEM)
Ptychography
Large Angle Rocking Beam Electron Diffraction (LARBED)
Digital-Electron Diffraction (D-ED)
With their application to characterisation electron beam sensitive materials such as pharmaceuticals organics, and in situ electron experiments.

Our technique development work includes the application of Machine Learning and Artificial Intelligence to electron microscopy, with a view to enabling TEM to become a more Metrological science, with high reproducibility and quantitative data for
measurements of the atomic and electronic structure of materials.

We develop methods and software which adheres to the FAIR principles, and enables TEM to become and more open science.

Research Interests

  • Transmission Electron Microscopy
  • Electron Diffraction
  • 3D Electron Diffraction
  • Nano Crystallography
  • Polymorphism
  • Automation of TEM
  • Phase Inverse Problems
  • In Situ TEM
  • CryoEM
  • Machine Learning
  • Metrology
  • Open Data Formats
  • Energy Dispersive X-ray spectroscopy (EDS)
  • 4D Scanning Transmission Electron Microscopy
  • Ptychography

Professional Activities

Education

  • 2003 University of Glasgow - PhD

Employment

  • Cornell University - Postdoctoral Researcher
  • Stony Brook University - Postdoctoral Researcher
  • University of Oxford - Research Fellow
  • Johannes Gutenberg University Mainz - Postdoctoral Researcher
  • University of Patras - Senior Research Fellow
  • University of Limerick - Senior Research Fellow

Association

  • Member, Institute of Physics
  • member, Royal Microscopy Society

Research Collaborators

  • A. Cavallo - Joint Publication - Certema -Italy
  • A. Gurlo - Joint Publication - Darmstadt University of Technology -Germany
  • Andras Kovacs - Joint Publication - Forschungszentrum Jülich -Germany
  • Christine Leidinger - Joint Publication - Forschungszentrum Jülich -Germany
  • Demie Kepatsogloub - Joint Publication - STFC Daresbury Laboratory -England
  • Ericvan Genderen - Joint Publication - Leiden University -Netherlands
  • Ervin Mehmedovic - Joint Publication - University of Duisburg Essen -Germany
  • F. Karavassili - Joint Publication - University of Patras -Greece
  • G. Lezzi - Joint Publication - University of Chieti-Pescara -Italy
  • G Bromiley - Joint Publication - University of Edinburgh -Scotland
  • Gustav Bihlmayer - Joint Publication - Forschungszentrum Jülich -Germany
  • H- J. Kleebe - Joint Publication - Darmstadt University of Technology -Germany
  • Hartmut Wiggers - Joint Publication - University of Duisburg Essen -Germany
  • I. Margiolaki - Joint Publication - University of Patras -Greece
  • Igor Nederlof - Joint Publication - Leiden University -Netherlands
  • Jan Pieter Abrahams - Joint Publication - Leiden University -Netherlands
  • Jonathan Wright - Joint Publication - ESRF - the European Synchrotron Radiation Facility -France
  • K. C. Barentsen - Joint Publication - Leiden University -Netherlands
  • M. Schwarz - Joint Publication - Darmstadt University of Technology -Germany
  • Maged Bekheet - Joint Publication - Darmstadt University of Technology -Germany
  • Martha Escarcega - Joint Publication - Institute of Chemical Research of Catalonia (ICIQ) -Spain
  • Martina Luysberg - Joint Publication - Forschungszentrum Jülich -Germany
  • Max Clabbers - Joint Publication - Leiden University -Netherlands
  • N. S. Pannu - Joint Publication - Leiden University -Netherlands
  • P artha Das - Joint Publication - Nanomegas SPRL -Belgium
  • P. Kroll - Joint Publication - Darmstadt University of Technology -Germany
  • Pengxiang Xu - Joint Publication - Forschungszentrum Jülich -Germany
  • Q. Portillo - Joint Publication - University of Barcelona -Spain
  • Quentin Rassmase - Joint Publication - STFC Daresbury Laboratory -England
  • Rafal E. Dunin- Borkowski - Joint Publication - Forschungszentrum Jülich -Germany
  • Reinhard Carius - Joint Publication - Forschungszentrum Jülich -Germany
  • Richard Beanland - External Examiner - University of Warwick -England
  • Robert Imlau - Joint Publication - Forschungszentrum Jülich -Germany
  • S. Lauterbach - Joint Publication - Darmstadt University of Technology -Germany
  • Stavros Nicolopoulos - Joint Publication - Nanomegas SPRL -Belgium
  • Tamir Gonen - Outgoing Visitor - Howard Hughes Medical Institute -USA
  • Tim Gruene - Joint Publication - Paul Scherrer Institute -Switzerland
  • Ute Kolb - Joint Publication - Johannes Gutenberg University of Mainz -Germany

Publications

Peer Reviewed Journals

2019

Dissolution of Indomethacin Crystals into a Polymer Melt: Role of Diffusion and Fragmentation
Moseson D.;Parker A.;Gilpin C.;Stewart A.;Beaudoin S.;Taylor L.
(2019) Dissolution of Indomethacin Crystals into a Polymer Melt: Role of Diffusion and Fragmentation
In Crystal Growth & Design;
DOI: 10.1021/acs.cgd.9b00200

2018

Nanometer-Scale Residual Crystals in a Hot Melt Extruded Amorphous Solid Dispersion: Characterization by Transmission Electron Microscopy
Moseson, DE;Mugheirbi, NA;Stewart, AA;Taylior, LS
(2018) Nanometer-Scale Residual Crystals in a Hot Melt Extruded Amorphous Solid Dispersion: Characterization by Transmission Electron Microscopy
In Crystal Growth & Design; WASHINGTON : AMER CHEMICAL SOC pp. 7633-7640
DOI: 10.1021/acs.cgd.8b01435

2018

MRCZ - A file format for cryo-TEM data with fast compression
McLeod, RA,Righetto, RD,Stewart, A,Stahlberg, H
(2018) MRCZ - A file format for cryo-TEM data with fast compression
In Journal Of Structural Biology; pp. 252-257
DOI: 10.1016/j.jsb.2017.11.012

2017

Ion-beam modification of 2-D materials - single implant atom analysis via annular dark-field electron microscopy
Bangert, U. and Stewart, A. and O'Connell, E. and Courtney, E. and Ramasse, Q. and Kepaptsoglou, D. and Hofsäss, H. and Amani, J. and Tu, J.-S. and Kardynal, B.
(2017) Ion-beam modification of 2-D materials - single implant atom analysis via annular dark-field electron microscopy
In Ultramicroscopy; pp. 31-36
DOI: 10.1016/j.ultramic.2016.12.011

2017

Ion-beam modification of 2-D materials - single implant atom analysis via annular dark-field electron microscopy
Bangert, U,Stewart, A,O'Connell, E,Courtney, E,Ramasse, Q,Kepaptsoglou, D,Hofsass, H,Anioni, J,Tu, JS,Kardynal, B
(2017) Ion-beam modification of 2-D materials - single implant atom analysis via annular dark-field electron microscopy
In Ultramicroscopy; pp. 31-36
DOI: 10.1016/j.ultramic.2016.12.011

2016

Ab initio structure determination of nanocrystals of organic pharmaceutical compounds by electron diffraction at room temperature using a Timepix quantum area direct electron detector
van Genderen, E,Clabbers, MTB,Das, PP,Stewart, A,Nederlof, I,Barentsen, KC,Portillo, Q,Pannu, NS,Nicolopoulos, S,Gruene, T,Abrahams, JP
(2016) Ab initio structure determination of nanocrystals of organic pharmaceutical compounds by electron diffraction at room temperature using a Timepix quantum area direct electron detector
In Acta Crystallographica A-Foundation And Advances; pp. 236-242
DOI: 10.1107/S2053273315022500

2016

Solid solution along the synthetic LiAlSi2O6-LiFeSi2O6 (spodumene-ferri-spodumene) join: A general picture of solid solutions, bond lengths, lattice strains, steric effects, symmetries, and chemical compositions of Li clinopyroxenes
Iezzi, G,Bromiley, GD,Cavallo, A,Das, PP,Karavassili, F,Margiolaki, I,Stewart, AA,Tribaudino, M,Wright, JP
(2016) Solid solution along the synthetic LiAlSi2O6-LiFeSi2O6 (spodumene-ferri-spodumene) join: A general picture of solid solutions, bond lengths, lattice strains, steric effects, symmetries, and chemical compositions of Li clinopyroxenes
In American Mineralogist; pp. 2498-2513
DOI: 10.2138/am-2016-5784

2014

Structural and electronic properties of beta-FeSi2 nanoparticles: The role of stacking fault domains
Imlau, R,Kovacs, A,Mehmedovic, E,Xu, PX,Stewart, AA,Leidinger, C,Dunin-Borkowski, RE,Bihlmayer, G,Wiggers, H,Carius, R,Kolb, U,Luysberg, M
(2014) Structural and electronic properties of beta-FeSi2 nanoparticles: The role of stacking fault domains
In Physical Review B;
DOI: ARTN 054104

2014

Structural and electronic properties of β - 2 nanoparticles: The role of stacking fault domains
Imlau R.;Kovács A.;Mehmedovic E.;Xu P.;Stewart A.;Leidinger C.;Dunin-Borkowski R.;Bihlmayer G.;Wiggers H.;Carius R.;Kolb U.;Luysberg M.
(2014) Structural and electronic properties of β - 2 nanoparticles: The role of stacking fault domains
In Physical Review B - Condensed Matter And Materials Physics;
DOI: 10.1103/PhysRevB.89.054104