03-09-2025, 04:05 AM
Capillary waves, like the ripples created by raindrops in a puddle, have been studied since ancient times. These waves hold particular significance in modern science, as they provide valuable insights into the properties of the medium they travel across. This makes them especially useful in microfluidic applications, where the behavior of fluids in microscopic environments is closely examined.
Now, researchers from Aalto University’s Department of Neuroscience and Biomedical Engineering, along with the Department of Applied Physics, have discovered new characteristics of capillary waves—setting a record for their speed in the process. Their findings, published today in Nature Communications, shed light on previously unknown wave phenomena.
Plastronic Waves: A Breakthrough in Wave Dynamics
The interdisciplinary team, led by Assistant Professor Heikki Nieminen and Professor Robin Ras, created a synthetic surface inspired by lotus leaves to explore wave behavior. This surface, known as a superhydrophobic material, repels water so effectively that it traps a thin gas layer—called a plastron—beneath it when submerged. The plastron plays a crucial role in protecting the surface from corrosion and contamination while also improving its hydrodynamic properties.
To better understand superhydrophobicity, the researchers investigated how the plastron responds to highly focused ultrasound waves. Their experiment generated a new type of ripple, which they named plastronic waves.
“Plastronic waves traveled across the water, the superhydrophobic surface, and the gas layer at a speed 45 times faster than typical capillary waves,” Nieminen explains.
Monitoring the Stability of Superhydrophobic Surfaces
Beyond setting a speed record, the study also demonstrated how these waves could be used to monitor the plastron’s stability. Maintaining this delicate gas layer is critical for applications in both industry and biomedical fields.
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“Superhydrophobicity relies on the plastron’s stability, which opens up new possibilities for submerged applications, such as enhancing the lifespan and efficiency of equipment,” says Postdoctoral Researcher Maxime Fauconnier, the study’s first author. “Our technique provides a superior tool for monitoring this gas layer’s stability.”
Potential Applications in Science and Technology
This discovery not only advances fundamental scientific understanding but also paves the way for practical applications in biotechnology and materials science.
“We demonstrated that we can track how the plastron evolves and gradually dissolves into the surrounding water by observing changes in wave speed over time,” Fauconnier adds. “This system could function as a sensor in various applications, including pharmacology and cell technology.”
By unlocking new insights into wave dynamics and superhydrophobicity, this research lays the foundation for future innovations in diverse scientific and industrial fields.
Now, researchers from Aalto University’s Department of Neuroscience and Biomedical Engineering, along with the Department of Applied Physics, have discovered new characteristics of capillary waves—setting a record for their speed in the process. Their findings, published today in Nature Communications, shed light on previously unknown wave phenomena.
Plastronic Waves: A Breakthrough in Wave Dynamics
The interdisciplinary team, led by Assistant Professor Heikki Nieminen and Professor Robin Ras, created a synthetic surface inspired by lotus leaves to explore wave behavior. This surface, known as a superhydrophobic material, repels water so effectively that it traps a thin gas layer—called a plastron—beneath it when submerged. The plastron plays a crucial role in protecting the surface from corrosion and contamination while also improving its hydrodynamic properties.
To better understand superhydrophobicity, the researchers investigated how the plastron responds to highly focused ultrasound waves. Their experiment generated a new type of ripple, which they named plastronic waves.
“Plastronic waves traveled across the water, the superhydrophobic surface, and the gas layer at a speed 45 times faster than typical capillary waves,” Nieminen explains.
Monitoring the Stability of Superhydrophobic Surfaces
Beyond setting a speed record, the study also demonstrated how these waves could be used to monitor the plastron’s stability. Maintaining this delicate gas layer is critical for applications in both industry and biomedical fields.
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“Superhydrophobicity relies on the plastron’s stability, which opens up new possibilities for submerged applications, such as enhancing the lifespan and efficiency of equipment,” says Postdoctoral Researcher Maxime Fauconnier, the study’s first author. “Our technique provides a superior tool for monitoring this gas layer’s stability.”
Potential Applications in Science and Technology
This discovery not only advances fundamental scientific understanding but also paves the way for practical applications in biotechnology and materials science.
“We demonstrated that we can track how the plastron evolves and gradually dissolves into the surrounding water by observing changes in wave speed over time,” Fauconnier adds. “This system could function as a sensor in various applications, including pharmacology and cell technology.”
By unlocking new insights into wave dynamics and superhydrophobicity, this research lays the foundation for future innovations in diverse scientific and industrial fields.