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

Dispersing swimming microalgae in self-assembled nanocellulose suspension: Unveiling living colloid dynamics in cholesteric liquid crystals

Guang Chu, Fereshteh Sohrabi, Jaakko V.I. Timonen, Orlando J. Rojas 2022 Journal of Colloid and Interface Science

Recombinant protein condensation inside E. coli enables the development of building blocks for bioinspired materials engineering – Biomimetic spider silk protein as a case study

Bartosz Gabryelczyk, Fred-Eric Sammalisto, Julie-Anne Gandier, Jianhui Feng, Grégory Beaune, Jaakko V.I. Timonen, Markus B. Linder 2022 Materials Today Bio

Simultaneous and Independent Micromanipulation of Two Identical Particles with Robotic Electromagnetic Needles

Ogulcan Isitman, Hakan Kandemir, Gokhan Alcan, Zoran Cenev, Quan Zhou 2022 Proceedings of MARSS 2022 - 5th International Conference on Manipulation, Automation, and Robotics at Small Scales

Liquid-Liquid Phase Separation and Assembly of Silk-like Proteins is Dependent on the Polymer Length

Laura Lemetti, Alberto Scacchi, Yin Yin, Mengjie Shen, Markus B. Linder, Maria Sammalkorpi, A. Sesilja Aranko 2022 Biomacromolecules

Magnetic field-driven particle assembly and jamming for bistable memory and response plasticity

Xianhu Liu, Hongwei Tan, Carlo Rigoni, Teemu Hartikainen, Nazish Asghar, Sebastiaan van Dijken, Jaakko V.I. Timonen, Bo Peng, Olli Ikkala 2022 Science Advances

β-1,3-Glucan synthesis, novel supramolecular self-assembly, characterization and application

Robert Pylkkänen, Pezhman Mohammadi, Ville Liljeström, Wojciech Płaziński, Grégory Beaune, Jaakko Timonen, Merja Penttilä 2022 Nanoscale

Ferrofluidic aqueous two-phase system with ultralow interfacial tension and micro-pattern formation

Carlo Rigoni, Grégory Beaune, Bent Harnist, Fereshteh Sohrabi, Jaakko V.I. Timonen 2022 Communications Materials

Self-assembly of two-component soft systems controlled by pairwise interactions

Alberto Scacchi, Sousa Javan Nikkhah, Maria Sammalkorpi, Tapio Ala-Nissila 2022

Modified Poisson-Boltzmann theory for polyelectrolytes in monovalent salt solutions with finite-size ions

Hossein Vahid, Alberto Scacchi, Xiang Yang, Tapio Ala-Nissila, Maria Sammalkorpi 2022 Journal of Chemical Physics
More information on our research in the Research database.
Research database

Earlier publications (2010 - 2017)

Scientific publications by the Active Matter group pre-2018.

  • Published:
  • Updated:
Share
URL copied!