International Online Workshop: Multidimensional Particle Characterisation

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Multidimensional particle characterisation is of key importance for the understanding of complex multiphase products across all length scales from molecules to particles, complex materials and devices. Unifying principles for the comprehensive design of particulate products in particular include the characterisation of the particles along the five dimensions of size, shape, surface, structure and composition.

From 27 to 29 January 2021, the Erlangen Collaborative Research Center 1411 on “Design of Particulate Products”, the Priority Programme 2045 “Highly specific and multidimensional fractionation of fine particle systems with technical relevance” and the LUM company jointly organised an international workshop on multidimensional characterisation of particle systems. In 19 talks, experts from academia and industry reviewed the status quo of multidimensional particle characterisation using state-of-the-art and newly developed methodologies. It was demonstrated that disperse properties of particles can be monitored in situ by advanced spectroscopic and scattering techniques. Gas phase analytics serve as powerful tool to characterise air born particles as well as particles from liquid phase using spraying technologies. Cutting-edge tomographic TEM- and X-ray-microscopy-based techniques open unique views into the internal microstructure of single particles, particle agglomerations, porous materials and photonic structures on different length scales. Analytical ultracentrifugation with its unprecedented accuracy, resolution and reproducibility allows determination of the band gap vs. size dependencies of quantum dots or the measurement of the full 2-dimensional distributions of plasmonic nanorods in one single experiment.

A special emphasis was further laid upon the identification of key challenges and intersections of the different techniques. The latter is of particular importance, as particle systems of continuously increasing complexity require diverse and multi-instrumental approaches to tackle their multidimensional properties. Overall, the workshop promoted intense discussions and exchange between the ~ 220 participants and may thus become further the nucleus of future joint activities.

Workshop Programme

(All times provided in the programme are at CET – Central European Time)

27 January 2021
13:30 – 14:00 Welcome address by Wolfgang Peukert (FAU), Urs Peuker (TU Bergakademie Freiberg) and Dietmar Lerche (LUM GmbH)
Session 1: Functional nanoparticles and their characterisation challenges
14:00 – 14:30 Characterisation of plasmonic and magnetic NPs for biomedical applications Thanh Nguyen
University College London, UK
14:30 – 15:00 Development of nano-flow cytometry for the multiparameter characterisation of functional nanoparticles Xiaomei Yan
Xiamen University, China
15:00 – 15:30 Challenges and solutions for the multidimensional characterisation of plasmonic patchy particles Robin Klupp Taylor
FAU, Germany
15:30 – 16:00 Integrating single particle and ensemble approaches for the characterisation of plasmonic nanoparticles: Are we there yet? Laura Fabris
Rutgers University, USA
16:00 – 16:15 Break
Session 2: Gas phase analytics
16:15 – 16:45 Multidimensional aerosol mobility-mass measurements: Application in plasma and colloidal systems Chris Hogan
University of Minnesota, USA
16:45 – 17:15 Characterisation of aerosol-generated nanoparticles: From ensemble average to single-particle analysis Maria E Messing
Lund University, Sweden
17:15 – 17:45 Bulk and surface properties of metal nanoparticles and their influence on particle-wall collisions Alfred Weber
TU Clausthal, Germany
17:45 – 18:15 Density determination for particles of unknown shape by mobility classified mass spectrometry Christian Lübbert
FAU, Germany
28 January 2021
Session 3: 3D characterisation of particles and particle aggregates I
14:00 – 14:30 Internal structure and packing of particles: Quantitative morphological analysis and simulations based on electron tomographic reconstructions Christian Kübel
Karlsruhe Institute of Technology, Germany
14:30 – 15:00 Multidimensional particle characterisation – particle discrete information – application for separation Urs Peuker
TU Bergakademie Freiberg, Germany
15:00 – 15:30 Correlative laboratory nano-CT and 360° electron tomography: Perspectives for scale-bridging characterisation of particles and pore structures Erdmann Spiecker
FAU, Germany
15:30 – 15:45 Break
Session 4: 3D characterisation of particles and particle aggregates II
15:45 – 16:15 Electron tomography for the study of intriguing materials science and physics phenomena Gerald Kothleitner
Graz University of Technology, Austria
16:15 – 16:45 Electron tomography in materials science: From supraparticles to individual atoms Sara Bals
University of Antwerp, Belgium
16:45 – 17:15 Atomic electron tomography of nanoparticles for magnetic and catalytic applications Colin Ophus
Berkeley Lab, USA
29 January 2021
Session 5: Sedimentation analysis for dispersions I
13:00 – 13:30 Multidimensional characterisation of nanoparticles by analytical ultracentrifugation with multiwavelength detection Helmut Cölfen
University of Konstanz, Germany
13:30 – 14:00 High field stability of ferrofluids for separation of plastics B.H. (Ben) Erne
Utrecht University, Netherlands
14:00 – 14:30 Identification, bio-corona and lifecycle releases of nanoparticles: Analytical ultracentrifugation and related techniques Wendel Wohlleben
BASF SE, Germany
14:30 – 14:45 Break
Session 6: Sedimentation analysis for dispersions II
14:45 – 15:15 Approaches for multidimensional property characterisation of particles using sedimentation analytics Johannes Walter
FAU, Germany
15:15 – 15:45 Progress of analytical centrifugation: Multidimensional characterisation of nanoparticles Dietmar Lerche
LUM GmbH, Germany
15:45 – 16:00 Closing remarks by Wolfgang Peukert (FAU)