Friction and Wetting Transitions of Magnetic Droplets on Micropillared Superhydrophobic Surfaces

Anas Al-Azawi, Mika Latikka, Ville Jokinen, Sami Franssila, Robin H.A. Ras*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

10 Sitaatiot (Scopus)
143 Lataukset (Pure)

Abstrakti

Reliable characterization of wetting properties is essential for the development and optimization of superhydrophobic surfaces. Here, the dynamics of superhydrophobicity is studied including droplet friction and wetting transitions by using droplet oscillations on micropillared surfaces. Analyzing droplet oscillations by high-speed camera makes it possible to obtain energy dissipation parameters such as contact angle hysteresis force and viscous damping coefficients, which indicate pinning and viscous losses, respectively. It is shown that the dissipative forces increase with increasing solid fraction and magnetic force. For 10 µm diameter pillars, the solid fraction range within which droplet oscillations are possible is between 0.97% and 2.18%. Beyond the upper limit, the oscillations become heavily damped due to high friction force. Below the lower limit, the droplet is no longer supported by the pillar tops and undergoes a Cassie–Wenzel transition. This transition is found to occur at lower pressure for a moving droplet than for a static droplet. The findings can help to optimize micropillared surfaces for low-friction droplet transport.

AlkuperäiskieliEnglanti
Artikkeli1700860
Sivut1-7
JulkaisuSmall
Vuosikerta13
Numero38
DOI - pysyväislinkit
TilaJulkaistu - 11 lokakuuta 2017
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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