Full length articleSuperoleophobic surfaces via functionalization of electrophoretic deposited SiO2 spheres on smart aluminum substrates
Section snippets
Methods
Electrophoretic deposition (EPD) is a widespread method to deposit solid particles from a suspension using an electric field [[23], [24], [25], [26], [27], [28]]. Particle migration under the electric field depends on the formation of surface charges. This depends either on the pH used or in general on the extent of particle surface ion adsorption from any ionic additive [24]. To achieve large particle surface charges we add various salts of diphosphoric acid in a starting concentration of not
Experimental
A short pulsed laser source (TRUMPF TruMark5020) is used to structure the surface of an aluminum substrate. The Master Oscillator Fiber Power amplifier architecture of the systems allows a maximum average power of 20 W, a maximum pulse peak power of 14 kW and a maximum pulse energy of 0,8 mJ. For the experiments a single pulse energy of Ep = 250 μJ at a pulse duration tp = 200 ns was set to ablate the material mostly via evaporation of the aluminum. Compared to the use of ultra-short pulsed
Results
Electrophoretic deposition is conducted varying either the used pyrophosphate compound or the surface topography of the anode. We protocol the electrolyte current that is of the order of I = 100 μA or j = 19 mA/dm2 which cumulates after a typical deposition period of t = 15 min to transported charges of about 0.1 C. The number of deposited particles is extracted from microscopy images by counting individuals. Fig. 3 displays the relation between transported charge and deposited particles.
In
Summary
In this work, we prepared superoleophobic surfaces using a combination of physical and chemical surface treatments. First, laser-structured aluminum surfaces are deposited with SiO2 microspheres by electrophoretic deposition. It is found that the evolving particle distribution is strongly controlled by the presence of sharp edges on the surface. In particular, three-dimensional structures could be generated at the rim of laser dimples. The combination of 50 μm sized laser dimples and complex 3d
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