About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Nanostructures
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| Presentation Title |
Vapor Phase Grown Metal Oxide Nanoparticles in Aqueous Environments: Structure Formation, Transformation Behaviour, and Reactivity |
| Author(s) |
Oliver Diwald, Daniel Thomele, Hasan Razouq, Kerstin Neuhauser, Thomas Berger, Gilles Bourret |
| On-Site Speaker (Planned) |
Oliver Diwald |
| Abstract Scope |
The stability of metal oxide nanostructures and their interface-controlled organization on the mesoscale is a key factor in material processing. Furthermore, understanding their size-dependent stability in contact with water and/or CO2 is important for chemical weathering or material aging.
In contact with water, MgO nanoparticles spontaneously transform into nanorods and monocrystalline nanosheets. The process involves different steps and includes the topotactic transformation of hydroxide layers into layered metal oxides.[1] As a second example, the incongruent solubility of Ba ions from BaTiO3 nanoparticles is discussed. In contact with air, aqueous Ba solutions spontaneously transform into crystalline BaCO3 needles and generate characteristic nano- and microstructures.[2] The various ways in which water can influence the organization of vapor-grown metal oxide nanoparticles via their interfaces are discussed.
[1] D. Thomele, et al. Cryst. Growth Des. (2021) 21, 8, 4674;
[2] H. Razouq, K. Neuhauser, et al. ACS Appl. Nanomater., (2023) 21, 19887; |