Department of Applied Physics

Active Matter

The research group focuses on active matter, non-equilibrium systems and fluids and colloids in EM fields.

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

Functional Magnetic Microdroplets for Antibody Extraction

Hedar H. Al-Terke, Mika Latikka, Jaakko V. I. Timonen, Ladislau Vekas, Arja Paananen, Jussi Joensuu, Robin H. A. Ras 2022 Advanced Materials Interfaces

Trpv protein family—from mechanosensing to cancer invasion

Tytti Kärki, Sari Tojkander 2021 BIOMOLECULES

Adipokine Leptin Co-operates With Mechanosensitive Ca2 +-Channels and Triggers Actomyosin-Mediated Motility of Breast Epithelial Cells

Anna Acheva, Tytti Kärki, Niccole Schaible, Ramaswamy Krishnan, Sari Tojkander 2021 Frontiers in Cell and Developmental Biology

Chlamydomonas reinhardtii swimming in the Plateau borders of 2D foams

Oskar Tainio, Fereshteh Sohrabi, Nikodem Janarek, Juha Koivisto, Antti Puisto, Leevi Viitanen, Jaakko Timonen, Mikko Alava 2021 Soft Matter

Diversity of non-equilibrium patterns and emergence of activity in confined electrohydrodynamically driven liquids

Geet Raju, Nikos Kyriakopoulos, Jaakko V.I. Timonen 2021 Science Advances

Erratum

Oskar Tainio, Fereshteh Sohrabi, Nikodem Janarek, Juha Koivisto, Antti Puisto, Leevi Viitanen, Jaakko V.I. Timonen, Mikko Alava 2021

Electroferrofluids with nonequilibrium voltage-controlled magnetism, diffuse interfaces, and patterns

Tomy Cherian, Fereshteh Sohrabi, Carlo Rigoni, Olli Ikkala, Jaakko V.I. Timonen 2021 Science Advances

Ferrofluidic Manipulator

Zoran Cenev, P. A. Diluka Harischandra, Seppo Nurmi, Mika Latikka, Ville Hyninen, Robin H.A. Ras, Jaakko V.I. Timonen, Quan Zhou 2021 IEEE/ASME Transactions on Mechatronics

Fusion Dynamics of Hybrid Cell–Microparticle Aggregates

Grégory Beaune, Laura Sinkkonen, David Gonzalez-Rodriguez, Jaakko V.I. Timonen, Françoise Brochard-Wyart 2021 Langmuir
More information on our research in the Research database.
Research database

Earlier publications (2010 - 2017)

Scientific publications by the Active Matter group pre-2018.

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