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In-situ scattering studies of nanoparticle formation under supercritical conditions

Bo Brummerstedt Iversen, Center of Materials Crystallography, Department of Chemistry and iNANO, Aarhus University

2019.05.21 | Trine Møller Hansen

Date Tue 18 Jun
Time 14:45 15:10
Location iNANO AUD (1593-012), Gustav Wieds Vej 14, 8000 Aarhus C

Bo Brummerstedt Iversen, Center of Materials Crystallography, Department of Chemistry and iNANO, Aarhus University

In-situ scattering studies of nanoparticle formation under supercritical conditions

 

X-ray and neutron investigations of the atomic structure of crystalline matter represent a shining cornerstone in science, but so far crystallography has essentially concerned “static”, “average” structures of materials at idealized conditions. Tremendous progress can be achieved if we can study real structures of real materials under real conditions in real time. The rapid development of X-ray total scattering facilitated by immense progress in radiation sources and analysis software has given the possibility to study non-crystalline samples. Using special in situ reactors we have followed nanocrystal nucleation and growth [1, 2] and shown that classical nucleation theories are far from the truth [3]. In this talk recent examples on MOFs [4] and core-shell nanocatalysts [5] will be discussed.

 

References

1. In Situ Studies of Solvothermal Synthesis of Energy Materials, Jensen, K. M. Ø.; Tyrsted, C.; Bremholm, M.; Iversen, B. B. ChemSusChem 2014, 7, 1594-1611
2. Pitfalls and reproducibility of in situ synchrotron powder X-ray diffraction studies of solvothermal nanoparticle formation, Andersen, H. L.; Bøjesen, E. D.; Birgisson, S.; Christensen, M.; Iversen, B. B. J. Appl. Crystallogr. 2018, 51, 526-540
3. The chemistry of nucleation, Bøjesen, E. D.; Iversen, B. B. CrystEngComm 2016, 18, 8332 – 8353
4. The Chemistry of Nucleation: In situ Pair Distribution Function analysis of secondary building units during UiO-66 MOF formation, Xu, H.; Sommer, S.; Broge, N. L. N.; Gao, J.; Iversen, B. B. Chem. Eur. J. 2019, 25, 2051-2058
5. Formation mechanism of epitaxial palladium-platinum core-shell nanocatalysts during versatile and scalable supercritical synthesis, Broge, N. L. N.; Søndergaard-Pedersen, F. M.; Sommer, S.; Iversen, B. B., Adv. Func. Mater. 2019, in review.

 
The lecture is part of the symposium Recent progress in small-angle scattering from soft matter and biological systems on the occasion of Professor Jan Skov Pedersen's 60th birthday.  

Specialized iNANO Lectures