Active Matter

Current focus

  • Active matter: We investigate behavior of biological micro/milliswimmers in complex environments and interfaces. We also develop, engineer and synthesize artificial systems that mimic naturally occurring active materials.
  • Non-equilibrium systems: Active matter is just one example of non-equilibrium systems. We are interested in the transition between equilibrium and non-equilibrium self-assembly.
  • Fluids and colloids in EM fields: We are interested in the ways that fluids and colloidal matter interact with electric and magnetic fields. We also develop new electromagnetic microtweezing tools for soft matter research.

Open positions

We always welcome applications from enthusiastic researchers of all levels (from students to post-docs). Contact Prof. Jaakko Timonen for details.

Research highlights

  • Daniel D., Timonen J.V.I., Li R., Velling S.J., Aizenberg J.A.,
    Oleoplaning droplets on lubricated surfaces,
    Nature Physics (2017). (link)

  • Timonen J.V.I., Raimondo C., Pilans D., Pillai P.P., Grzybowski B.A.,
    Trapping, Manipulation, and Crystallization of Live Cells Using Magnetofluidic Tweezers,
    Nanoscale Horizons 2, 50-54 (2017). (link)

  • Timonen J.V.I., Demirörs A.F., and Grzybowski B.A., 
    Magnetofluidic Tweezing of Nonmagnetic colloids,
    Advanced Materials 28, 3453-3459 (2016). (link)

  • Timonen J.V.I., Latikka M., Leibler L., Ras R.H.A., and Ikkala O., 
    Switchable Static and Dynamic Self-Assembly of Magnetic Droplets on Superhydrophobic Surfaces,
    Science 341, 253-257 (2013). (link) (press release)

  • Timonen J.V.I., Latikka M., Ikkala O., Ras R.H.A., 
    Free-Decay and Resonant Methods for Investigating the Fundamental Limit of Superhydrophobicity,
    Nature Communications 4, 2398 (2013). (link) (press release)

  • Timonen J.V.I., Seppälä E.T., Ikkala O., and Ras R.H.A., 
    From hot-injection synthesis to heating-up synthesis of cobalt nanoparticles: observation of kinetically controllable nucleation,
    Angewandte Chemie International Edition 50, 2080-2084 (2011). (link)

Facilities

  • Wet chemistry lab equipped for nanoparticle/colloid synthesis
  • Bioroom equipped for BSL1 micro-organisms
  • Physical measurements lab equipped with
    -  Nikon Ti-E and Zeiss Z1 inverted microscopes
    -  Andor iXon Ultra 888 EMCCD and Zyla 4.2 sCMOS cameras
    -  Photron APX-RS high-speed camera (color, 1024x1024 @ 3000 fps)
    -  Keysight/Keithley precision measurement units and power supplies
  • Other facilities at our disposal
    Nanomicroscopy center (electron microscopy, x-ray scattering) 
    Micronova (nano/microfabrication)
    -  Department of Applied Physics (general tools and equipment)

Latest publications

Department of Applied Physics, Active Matter

Tunability of liquid-infused silicone materials for biointerfaces

Publishing year: 2018 Biointerphases
Department of Bioproducts and Biosystems, Biomolecular materials, Department of Applied Physics, Active Matter

Self-Coacervation of a Silk-Like Protein and Its Use As an Adhesive for Cellulosic Materials

Publishing year: 2018 ACS Macro Letters
Department of Applied Physics, Active Matter

Film Dynamics and Lubricant Depletion by Droplets Moving on Lubricated Surfaces

Publishing year: 2018 Physical Review X
Department of Applied Physics, Active Matter

Multifunctional ferrofluid-infused surfaces with reconfigurable multiscale topography

Publishing year: 2018 Nature
Soft Matter and Wetting, Department of Applied Physics, Active Matter, Department of Bioproducts and Biosystems

Wetting of ferrofluids

Publishing year: 2018 Current Opinion in Colloid and Interface Science
Department of Applied Physics, Active Matter

Origins of Extreme Liquid Repellency on Structured, Flat, and Lubricated Hydrophobic Surfaces

Publishing year: 2018 Physical Review Letters
Department of Applied Physics, Active Matter

Structural origins of coloration in the spider Phoroncidia rubroargentea Berland, 1913 (Araneae: Theridiidae) from Madagascar

Publishing year: 2018 Journal of the Royal Society Interface
Department of Applied Physics, Active Matter

Oleoplaning droplets on lubricated surfaces

Publishing year: 2017 Nature Physics
Soft Matter and Wetting, Department of Applied Physics, Active Matter

Slippery and never wet

Publishing year: 2017 Europhysics News
Department of Applied Physics, Molecular Materials, Active Matter

Photothermally triggered actuation of hybrid materials as a new platform for in vitro cell manipulation

Publishing year: 2017 Nature Communications
More information on our research in the Research database.
Research database

Earlier publications (2010 - 2017)

Scientific publications by the Active Matter group pre-2018.

Contact

Jaakko Timonen

Jaakko Timonen

Department of Applied Physics
Assistant Professor
Fereshteh Sohrabi

Fereshteh Sohrabi

Department of Applied Physics
Doctoral Candidate

Geet Raju

Department of Applied Physics
Doctoral Candidate
Grégory Beaune

Grégory Beaune

Department of Applied Physics
Postdoctoral Researcher

Laura Sinkkonen

Department of Applied Physics
Research Assistant
Nikos Kyriakopoulos

Nikos Kyriakopoulos

Department of Applied Physics
Postdoctoral Researcher

Tytti Kärki

Department of Applied Physics
Doctoral Candidate

Ricardo Reyes Garza

Department of Applied Physics
Doctoral Candidate

Carlo Rigoni

Department of Applied Physics
Postdoctoral Researcher
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