Free-Decay and Resonant Methods for Investigating the Fundamental Limit of Superhydrophobicity

Research output: Contribution to journalArticle

Standard

Harvard

APA

Vancouver

Author

Bibtex - Download

@article{9eb6e3e6f0f44de3bc27c69ba7e254ad,
title = "Free-Decay and Resonant Methods for Investigating the Fundamental Limit of Superhydrophobicity",
abstract = "The recently demonstrated extremely water-repellent surfaces with contact angles close to 180° with nearly zero hysteresis approach the fundamental limit of non-wetting. The measurement of the small but non-zero energy dissipation of a droplet moving on such a surface is not feasible with the contemporary methods, although it would be needed for optimized technological applications related to dirt repellency, microfluidics and functional surfaces. Here we show that magnetically controlled freely decaying and resonant oscillations of water droplets doped with superparamagnetic nanoparticles allow quantification of the energy dissipation as a function of normal force. Two dissipative forces are identified at a precision of ~ 10 nN, one related to contact angle hysteresis near the three-phase contact line and the other to viscous dissipation near the droplet–solid interface. The method is adaptable to common optical goniometers and facilitates systematic and quantitative investigations of dynamical superhydrophobicity, defects and inhomogeneities on extremely superhydrophobic surfaces.",
keywords = "ferrofluid, superhydrophobic, ferrofluid, superhydrophobic, ferrofluid, superhydrophobic",
author = "Timonen, {Jaakko V.I.} and Mika Latikka and Olli Ikkala and Ras, {Robin H.A.}",
year = "2013",
doi = "10.1038/ncomms3398",
language = "English",
volume = "4",
pages = "1--8",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",

}

RIS - Download

TY - JOUR

T1 - Free-Decay and Resonant Methods for Investigating the Fundamental Limit of Superhydrophobicity

AU - Timonen, Jaakko V.I.

AU - Latikka, Mika

AU - Ikkala, Olli

AU - Ras, Robin H.A.

PY - 2013

Y1 - 2013

N2 - The recently demonstrated extremely water-repellent surfaces with contact angles close to 180° with nearly zero hysteresis approach the fundamental limit of non-wetting. The measurement of the small but non-zero energy dissipation of a droplet moving on such a surface is not feasible with the contemporary methods, although it would be needed for optimized technological applications related to dirt repellency, microfluidics and functional surfaces. Here we show that magnetically controlled freely decaying and resonant oscillations of water droplets doped with superparamagnetic nanoparticles allow quantification of the energy dissipation as a function of normal force. Two dissipative forces are identified at a precision of ~ 10 nN, one related to contact angle hysteresis near the three-phase contact line and the other to viscous dissipation near the droplet–solid interface. The method is adaptable to common optical goniometers and facilitates systematic and quantitative investigations of dynamical superhydrophobicity, defects and inhomogeneities on extremely superhydrophobic surfaces.

AB - The recently demonstrated extremely water-repellent surfaces with contact angles close to 180° with nearly zero hysteresis approach the fundamental limit of non-wetting. The measurement of the small but non-zero energy dissipation of a droplet moving on such a surface is not feasible with the contemporary methods, although it would be needed for optimized technological applications related to dirt repellency, microfluidics and functional surfaces. Here we show that magnetically controlled freely decaying and resonant oscillations of water droplets doped with superparamagnetic nanoparticles allow quantification of the energy dissipation as a function of normal force. Two dissipative forces are identified at a precision of ~ 10 nN, one related to contact angle hysteresis near the three-phase contact line and the other to viscous dissipation near the droplet–solid interface. The method is adaptable to common optical goniometers and facilitates systematic and quantitative investigations of dynamical superhydrophobicity, defects and inhomogeneities on extremely superhydrophobic surfaces.

KW - ferrofluid

KW - superhydrophobic

KW - ferrofluid

KW - superhydrophobic

KW - ferrofluid

KW - superhydrophobic

U2 - 10.1038/ncomms3398

DO - 10.1038/ncomms3398

M3 - Article

VL - 4

SP - 1

EP - 8

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 2398

ER -

ID: 783121