Physics of Complex Fluids Group

The research goal of PCF is to understand and to control liquids and their interfaces from molecular to macroscopic scales. Our research connects fundamental phenomena in static and dynamic wetting, nanofluidics, microfluidic two-phase flow, functional surfaces, drop impact, and drop evaporation to practically relevant applications such as enhanced oil recovery, lab-on-a-chip systems, analytical chemistry (MALDI-MS), optofluidics, and inkjet printing.

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Experimental methods and tools: electrowetting, high resolution Atomic Force Microscopy and spectroscopy, (high speed) video microscopy, contact angle goniometry, particle tracking microrheology, macroscopic rheometry, (imaging) ellipsometry, quartz crystal microbalance, Langmuir trough and Langmuir-Blodgett deposition.

Latest news

Congratulations Bijoy

On Friday, February 12, Bijoy Bera successfully defended his PhD thesis entitled “Ion and Surfactant Induced Wetting Transition”. The project was a great success and delivered new insights into the mechanisms how cations of variable valency affect the relative wettability of water and oil on mineral surfaces. The findings provided a microscopic explanation of empirical findings by oil companies in their macroscopic core flooding experiments.
We wish Bijoy all the best for his future career, which has already started at the University of Amsterdam. ... read more


Congratulations, Dr. Somnath!

On Thursday 10 December, Somnath Ghosh successfully defended his PhD thesis entitled “Colloidal Dynamics in Flow and Confinement”. Key element of his research was the use of a Confocal Scanning Laser Microscope and Particle Tracking algorithms to measure individual displacements of silica spheres dispersed in viscous liquid. Microfluidic chips were used to study the effect of inhomogeneous flow and cylindrical confinement on the diffusive behavior of the particles. This has resulted in 4 publications, all in 2015. We wish Somnath success in his new job at the University of Lund! ... read more


A Review on Droplet manipulations in two-phase flow microfluidics

In this review by A.M. Pit et al., we discuss the most recent and promising techniques for manipulating droplets in microchannels. The physical principles are explained, and (potential) advantages and drawbacks of different methods in the sense of versatility, flexibility, tunability and durability are discussed; firstly per technique and also per droplet protocol: generation, transport, sorting, coalescence and splitting. ... read more

Publication in Biomicrofluidics on High-throughput sorting of drops in microfluidic chips

In the recent article by Arjen Pit, we show the sorting of picoliter droplets by use of insulated electrodes below the microchannel. Maximum rates of 1200 droplets per second are reported. In the article we explain the design criterions used for optimizing the sorting speeds, and we also give analytical estimates of the electrostatic and hydrodynamic forces that are exerted on the droplets. ... read more