344 citations · 818 across the 17 of their papers we have counts for
18 papers
Regular and Anomalous Motion of Individual Magnetic Quincke Rollers Under Rotating Magnetic Field
Zoran M. Cenev, Ville S. I. Havu, Jaakko V. I. Timonen
We report the motion of individual magnetic Quincke rollers composed of silica particles doped with superparamagnetic iron oxide nanoparticles, whose activity arises from the coupl…
Unlocking the full potential of jumping condensation on microstructured surfaces
Mariia S. Kiseleva, Tytti Karki, Mika Latikka +11
Water condensation on superhydrophobic surfaces can generate spontaneous droplet jumping, enabling rapid condensate removal and improved thermal and mass transfer. Although this ef…
Living Capillary Bridges
Tytti Kärki, Senna Luntama, Yasamin Modabber +5
Biological tissues exhibit complex behaviors with their dynamics often resembling inert soft matter such as liquids, polymers, colloids, and liquid crystals. These analogies enable…
Active Rosensweig Patterns
Carlo Rigoni, Max Philipp Holl, Alberto Scacchi +5
Ferrofluids, colloidal dispersions of magnetic nanoparticles, are renowned for pattern formation like few other materials. The Rosensweig instability of a horizontal ferrofluid-air…
Magnetically tunable electrokinetic instability and structuring of non-equilibrium nanoparticle gradients
Fereshteh Sohrabi, Carlo Rigoni, Tomy Cherian +2
Inspired by emergent behaviors of living matter, there is increasing interest in developing approaches to create dynamic patterns and structures in synthetic materials with control…
Quasi-Two-Dimensional Drops
Tytti Kärki, Into Pääkkönen, Nikos Kyriakopoulos +1
Liquid drops are everywhere around us and important in numerous technological applications. Here, we demonstrate a quasi-two-dimensional (Q2D) analogy to the regular, often close t…
A Coarse-grained Model for Aqueous Two-phase Systems: Application to Ferrofluids
Alberto Scacchi, Carlo Rigoni, Mikko Haataja +2
Aqueous two-phase systems (ATPSs), that is, phase-separating solutions of water soluble but mutually immiscible molecular species, offer fascinating prospects for selective partiti…
Magnetic control of orientational order and intrinsic hydrodynamic instability in bacterial turbulence
Kazusa Beppu, Jaakko V. I. Timonen
Highly concentrated active agents tend to exhibit turbulent flows, reminiscent of classical hydrodynamic turbulence, which has attracted considerable attention lately. Controlling…
Ferrofluidic Manipulator: Automatic Manipulation of Non-magnetic Microparticles at Air-Ferrofluid Interface
Zoran Cenev, P. A. Diluka Harischandra, Seppo Nurmi +5
Manipulation of small-scale matter is a fundamental topic in micro- and nanorobotics. Numerous magnetic robotic systems have been developed for the manipulation of microparticles i…
Ferrofluidic aqueous two-phase system with ultralow interfacial tension, instabilities and pattern formation
Carlo Rigoni, Bent Harnist, Grégory Beaune +1
Ferrofluids are strongly magnetic fluids consisting of magnetic nanoparticles dispersed in a carrier fluid. Besides their technological applications, they have a tendency to form b…
Electroferrofluids with non-equilibrium voltage-controlled magnetism, interfaces, and patterns
Tomy Cherian, Fereshteh Sohrabi, Carlo Rigoni +2
Materials with continuous dissipation can exhibit responses and functionalities that are not possible in thermodynamic equilibrium. While this concept is well-known, a major challe…
Structural diversity in electrohydrodynamically driven active and organized liquid states
Geet Raju, Nikos Kyriakopoulos, Jaakko V. I. Timonen
Spontaneous emergence of organized states in materials driven by non-equilibrium conditions is of significant fundamental and technological interest. In many cases, the organized s…
Wetting of ferrofluids: phenomena and control
Mika Latikka, Matilda Backholm, Jaakko V. I. Timonen +1
Ferrofluids are liquids exhibiting remarkably strong response to magnetic fields, which leads to fascinating properties useful in various applications. Understanding the wetting pr…
Film dynamics and lubricant depletion by droplets moving on lubricated surfaces
Michael J. Kreder, Dan Daniel, Adam Tetreault +4
Lubricated surfaces have shown promise in numerous applications where impinging foreign droplets must be removed easily; however, before they can be widely adopted, the problem of…
Origins of liquid-repellency on structured, flat, and lubricated surfaces
Dan Daniel, Jaakko V. I. Timonen, Ruoping Li +4
There are currently three main classes of high-performance liquid-repellent surfaces: micro-/nano-structured lotus-effect superhydrophobic surfaces, flat surfaces grafted with 'liq…
Oleoplaning droplets on lubricated surfaces
Dan Daniel, Jaakko V. I. Timonen, Ruoping Li +2
Recently, there has been much interest in using lubricated flat and nano-/micro-structured surfaces to achieve extreme liquid-repellency: any foreign droplet immiscible with the un…
Ferromagnetic resonance in -Co magnetic composites
Khattiya Chalapat, Jaakko V. I. Timonen, Maija Huuppola +7
We investigate the electromagnetic properties of assemblies of nanoscale -cobalt crystals with size range between 5 nm to 35 nm, embedded in a polystyrene (PS) matrix, at microw…
Magnetic nanocomposites at microwave frequencies
J. V. I. Timonen, R. H. A. Ras, O. Ikkala +5
Most conventional magnetic materials used in the electronic devices are ferrites, which are composed of micrometer-size grains. But ferrites have small saturation magnetization, th…