320 citations · 1.4k across the 21 of their papers we have counts for
22 papers
Exceptionally Dense and Resilient Polydisperse Disk Packings
Sangwoo Kim, Sascha Hilgenfeldt
Understanding the way disordered particle packings transition between jammed (rigid) and unjammed (fluid) states is of both great practical importance and strong fundamental intere…
Density-contrast induced inertial forces on particles in oscillatory flows
Siddhansh Agarwal, Gaurav Upadhyay, Yashraj Bhosale +2
Oscillatory flows have become an indispensable tool in microfluidics, inducing inertial effects for displacing and manipulating fluid-borne objects in a reliable, controllable, and…
DNA self-organization controls valence in programmable colloid design
Angus McMullen, Sascha Hilgenfeldt, Jasna Brujic
Just like atoms combine into molecules, colloids can self-organize into predetermined structures according to a set of design principles. Controlling valence -- the number of inter…
Predicting the Characteristics of Defect Transitions on Curved Surfaces
Siddhansh Agarwal, Sascha Hilgenfeldt
The energetically optimal position of lattice defects on intrinsically curved surfaces is a complex function of shape parameters. For open surfaces, a simple condition predicts the…
An unrecognized force in inertial microfluidics
Siddhansh Agarwal, Fan Kiat Chan, Mattia Gazzola +1
Describing effects of small but finite inertia on suspended particles is a fundamental fluid dynamical problem that has never been solved in full generality. Modern microfluidics h…
Size-dependent particle migration and trapping in 3D microbubble streaming flows
Andreas Volk, Massimiliano Rossi, Bhargav Rallabandi +3
Acoustically actuated sessile bubbles can be used as a tool to manipulate microparticles, vesicles and cells. In this work, using acoustically actuated sessile semi-cylindrical mic…
A simple, general criterion for onset of disclination disorder on curved surfaces
Siddhansh Agarwal, Sascha Hilgenfeldt
Determining the positions of lattice defects on elastic surfaces with Gaussian curvature is a non-trivial task of mechanical energy optimization, particularly for surfaces with bou…
Flow topology during multiplexed particle manipulation using a Stokes Trap
Anish Shenoy, Dinesh Kumar, Sascha Hilgenfeldt +1
Trapping and manipulation of small particles underlies many scientific and technological applications. Recently, the precise manipulation of multiple small particles was demonstrat…
Growth control of sessile microbubbles in PDMS devices
Andreas Volk, Massimiliano Rossi, Christian J. Kähler +2
In a microfluidic environment, the presence of bubbles is often detrimental to the functionality of the device, leading to clogging or cavitation, but microbubbles can also be an i…
Three-dimensional phenomena in microbubble acoustic streaming
Alvaro Marin, Massimiliano Rossi, Bhargav Rallabandi +3
Ultrasound-driven oscillating micro-bubbles have been used as active actuators in microfluidic devices to perform manifold tasks such as mixing, sorting and manipulation of micropa…
Analytical Results for Size-Topology Correlations in 2D Disc and Cellular Packings
Matthew P. Miklius, Sascha Hilgenfeldt
Random tilings or packings in the plane are characterized by a size distribution of individual elements (domains) and by the statistics of neighbor relations between the domains. M…
Trapping, focusing and sorting of microparticles through bubble streaming
Cheng Wang, Shreyas Jalikop, Sascha Hilgenfeldt
Ultrasound-driven microbubbles rectify oscillatory motion into strong steady streaming flow [1, 2]. In this fluid dynamics video, we show size-dependent trapping, focusing and sort…
Response of bubbles to diagnostic ultrasound: a unifying theoretical approach
Sascha Hilgenfeldt, Detlef Lohse, Michael Zomack
The scattering of ultrasound from bubbles of micrometer-sized radius, such as used in contrast enhancers for ultrasound diagnostics, is studied. We show that sound scattering and `…
Analysis of Rayleigh-Plesset dynamics for sonoluminescing bubbles
Sascha Hilgenfeldt, Michael P. Brenner, Siegfried Grossmann +1
Recent work on single bubble sonoluminescence (SBSL) has shown that many features of this phenomenon, especially the dependence of SBSL intensity and stability on experimental para…
Water temperature dependence of single bubble sonoluminescence
Sascha Hilgenfeldt, Detlef Lohse, Willy Moss
The strong dependence of the intensity of single bubble sonoluminescence (SBSL) on water temperature observed in experiment can be accounted for by the temperature dependence of th…
Sound radiation of 3 MHz driven gas bubbles
Siegfried Grossmann, Sascha Hilgenfeldt, Detlef Lohse +1
The sound radiation of 3 MHz acoustically driven air bubbles in liquid is analysed with respect to possible applications in second harmonic ultrasound diagnostics devices, which ha…
Inert gas accumulation in sonoluminescing bubbles
Detlef Lohse, Sascha Hilgenfeldt
In this paper we elaborate on the idea [Lohse et al., Phys. Rev. Lett. 78, 1359-1362 (1997)] that (single) sonoluminescing air bubbles rectify argon. The reason for the rectificati…
Why air bubbles in water glow so easily
Michael Brenner, Sascha Hilgenfeldt, Detlef Lohse +1
Sound driven gas bubbles in water can emit light pulses (sonoluminescence). Experiments show a strong dependence on the type of gas dissolved in water. Air is found to be one of th…
Phase Diagrams for Sonoluminescing Bubbles
Sascha Hilgenfeldt, Detlef Lohse, Michael Brenner
Sound driven gas bubbles in water can emit light pulses. This phenomenon is called sonoluminescence (SL). Two different phases of single bubble SL have been proposed: diffusively s…
Sonoluminescing air bubbles rectify argon
Detlef Lohse, Michael P. Brenner, Todd F. Dupont +2
The dynamics of single bubble sonoluminescence (SBSL) strongly depends on the percentage of inert gas within the bubble. We propose a theory for this dependence, based on a combina…
Acoustic Energy Storage in Single Bubble Sonoluminescence
Michael P. Brenner, Sascha Hilgenfeldt, Detlef Lohse +1
Single bubble sonoluminescence is understood in terms of a shock focusing towards the bubble center. We present a mechanism for significantly enhancing the effect of shock focusing…
Mechanisms for Stable Sonoluminescence
Michael Brenner, Detlef Lohse, David Oxtoby +1
A gas bubble trapped in water by an oscillating acoustic field is expected to either shrink or grow on a diffusive timescale, depending on the forcing strength and the bubble size.…