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

Active Matter, Department of Applied Physics

Clustering and anisotropic correlated percolation in polar flocks

Publishing year: 2019 Physical Review E
Department of Applied Physics, Soft Matter and Wetting, Biomolecular materials, Department of Bioproducts and Biosystems, Active Matter, Surface Science, NanoMaterials, Molecular Materials

Highly Luminescent Gold Nanocluster Frameworks

Publishing year: 2019 ADVANCED OPTICAL MATERIALS
Soft Matter and Wetting, Department of Applied Physics, Active Matter

Magnetic microdroplets as a method to extract antibodies from their growth media

Publishing year: 2019 Abstracts of papers of the American Chemical Society
Department of Bioproducts and Biosystems, Biohybrid materials, Department of Applied Physics, Active Matter, Biomolecular materials, Aalto University

Phthalocyanine–Virus Nanofibers as Heterogeneous Catalysts for Continuous-Flow Photo-Oxidation Processes

Publishing year: 2019 Advanced Materials
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
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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