Characterization of surface wetting uniformity in hydrophobic tubes using ferrofluid droplets

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Perustieteiden korkeakoulu | Master's thesis
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Date

2019-08-20

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Major/Subject

Advanced Materials for Innovation and Sustainability

Mcode

SCI3083

Degree programme

Master’s Programme in Advanced Materials for Innovation and Sustainability

Language

en

Pages

50+1

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Abstract

Hydrophobic surfaces, or water repellent surfaces, have interesting properties for applications on selfcleaning, anti-icing, antifogging and fluid drag reduction. To develop more efficient surfaces, proper characterization methods need to be developed as the current methods available are not sufficient. In this thesis, the theoretical background behind wetting phenomena on hydrophobic surfaces and various techniques for characterizing wetting properties are presented. Furthermore, a new characterization technique applied to hollow, non planar surfaces and more specifically to transparent tubes is proposed. This technique measures wetting inhomogeneities using magnetically controlled water-like droplets over the entire length of the samples. This technique can measure the retentive force, a dissipative force related to the contact angle hysteresis at the three-phase contact line. This technique is used to see differences in wetting properties using reference tubes and their annealed counterparts using two different ferrofluids. As a non-destructive and quantitative characterization method, this technique could readily be used for quality control in academia and industries.

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Supervisor

Ras, Robin

Thesis advisor

Latikka, Mika

Keywords

ferrofluid, wetting properties, hydrophobicity, superparamagnetic nanoparticles

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https://urn.fi/URN:NBN:fi:aalto-201909295508

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[dipl] Perustieteiden korkeakoulu / SCI