Rapidly oscillating microbubbles force development of micro- and mesoporous interfaces and composition gradients in solids

Daria V Andreeva; Pavel V Cherepanov; Y S Avadhut; Jürgen Senker

doi:10.1016/j.ultsonch.2018.07.024

Rapidly oscillating microbubbles force development of micro- and mesoporous interfaces and composition gradients in solids

Ultrason Sonochem. 2019 Mar:51:439-443. doi: 10.1016/j.ultsonch.2018.07.024. Epub 2018 Jul 19.

Authors

Daria V Andreeva¹, Pavel V Cherepanov², Y S Avadhut³, Jürgen Senker³

Affiliations

¹ Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore. Electronic address: daria.baeumler@gmail.com.
² Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore.
³ Inorganic Chemistry III, University of Bayreuth, Universitaetsstrasse 30, Bayreuth, Germany.

PMID: 30072259
DOI: 10.1016/j.ultsonch.2018.07.024

Abstract

Progress in understanding of energy transfer in nature and human being requires novel approaches to the processing of solids on demand, in specially those with composition gradients and those thermodynamically and kinetically inaccessible. We demonstrate that rapidly oscillating microbubbles are useful for materials processing, because they manipulate surface temperature and creates temperature gradients in predictable way. Ultrasonic treatment leads to an increase in the surface area of particles up to 180 m²g^-1 and the formation of micropores in metal phase and mesopores in metal oxide phase. The spatially and temporally unique energy dissipation conditions promise new interfaces with higher level of complexity and applications among others in catalysis, energy storage, drug delivery.

Keywords: Metal particles; Structuring; Temperature gradient; Ultrasound.