Abstract
Herein we compare various preparation methods for thin ZIF-8 layers on a Cu substrate for application as a host material for omniphobic lubricant-infused surfaces. Such omniphobic surfaces can be used in thermal engineering applications, for example to achieve dropwise condensation or anti-fouling and anti-icing surface properties. For these applications, a thin, conformal, homogeneous, mechanically and chemically stable coating is essential. In this study, thin ZIF-8 layers were deposited on a Cu substrate by different routes, such as (i) electrochemical anodic deposition on a Zn-covered Cu substrate, (ii) doctor blade technique for preparation of a composite layer containing PVDF binder and ZIF-8, as well as (iii) doctor blade technique for preparation of a two-layer composite on the Cu substrate containing a PVDF-film and a ZIF-8 layer. The morphology and topography of the coatings were compared by using profilometry, XRD, SEM and TEM techniques. After infusion with a perfluorinated oil, the wettability of the surfaces was assessed by contact angle measurements, and advantages of each preparation method were discussed.
Highlights
Omniphobic surfaces have a wide spectrum of applications, such as anti-fouling [1,2,3], anti-icing [4,5] or self-cleaning [6,7], in various fields, such as automotive, oil/gas, marine, paper and textile industries [8]
The results show that oil infusion with GPL 105 leads to a low contact angle hysteresis for both water and diiodomethane
We optimized the electrochemical deposition of zeolitic imidazolate framework (ZIF)-8 films to use them as host materials for LIS
Summary
Omniphobic (hydrophobic and lipophobic) surfaces have a wide spectrum of applications, such as anti-fouling [1,2,3], anti-icing [4,5] or self-cleaning [6,7], in various fields, such as automotive, oil/gas, marine, paper and textile industries [8]. A common approach is to achieve the so-called Cassie-Baxter state [8], where the droplet sits on top of a surface structure with trapped air underneath, so the liquid does not completely wet the surface With this kind of surface, very high contact angles (greater than 150◦) and very low contact angle hysteresis (lower than 5◦) can be achieved for a wide range of fluids [12,13]. These surfaces are not suitable for applications in which high contact angles have to be maintained under pressure or during condensation
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