Today, March 27th 2025, Henrik Bruus was the first speaker of the 'Van den Bergveld lecture'.
About the Van den Bergveld lecture (former Bergveld lecture): Every year the BIOS/Lab on a Chip group of Twente University invites a guest speaker for the Bergveld lecture. The Bergveld lecture was instituted in honor of prof. Piet Bergveld (retired chair of the group). As from 2025 the name of the Bergveld lecture has changed into Van den Bergveld lecture, in honor of Prof. Albert van den Berg too (also retired chair of the group). The speakers are chosen by members of the BIOS group through nomination and election.
Every speaker receives the prestigious tieclip, with 4 chips and the letters BL
Speaker
Henrik Bruus, Department of Physics, Technical University of Denmark (DTU)
Title
The rise and fall of acoustic streaming
Abstract
Since the first experimental demonstration of its existence by Faraday in 1839 and the theoretical explanation by Rayleigh in 1884, acoustic streaming has played a central role in the field of acoustofluidics. Acoustic streaming is useful for ultrasound cleaning and for efficient mixing of suspended microparticles. However, when working with ultrasound focusing or separation of micro- and nanoparticles, it is a nuisance, tending to oppose the desired particle manipulation, especially when working with particles smaller than 2 um. In the lecture I will focus on different strategies to suppress the otherwise ubiquitous acoustic streaming in lab-on-a-chip devices designed for micro- and nanoparticle handling in the low MHz range, such as employing shape optimization, inhomogeneous solutions, electro-osmosis, and metamaterials. Papers and student theses on this topic can be downloaded from my website https://www.staff.dtu.dk/bruus.
Short biosketch:
Henrik Bruus received his Ph.D. degree in physics from Niels Bohr Institute, University of Copenhagen in 1990, and then worked as postdoc at Nordic Institute of Theoretical Physics 1990-92, Yale University 1992-94 and CNRS Grenoble 1994-96. He returned to the Niels Bohr Institute as associate professor 1997-2001, before moving to the Technical University of Denmark in 2001. There, he became full professor of lab-chip systems in 2005 and of theoretical physics in 2012. His current research interests comprise micro/nanofluidics, acoustofluidics, electrokinetics, the physics of on-chip cell manipulation, the motion of sugar in living plants, and topology-optimized microflows. He has (co)authored more than 170 journal papers on condensed matter physics and microfluidics, 230 conference papers, and 2 monographs, the latest being "Theoretical Microfluidics", Oxford University Press (2008).
