Facile fabrication of micro-/nanostructured, superhydrophobic membranes with adjustable porosity by 3D printing

Mayoussi, Fadoua; Doeven, Egan H.; Kick, Andrea; Goralczyk, Andreas; Thomann, Yi; Risch, Patrick; Guijt, Rosanne M.; Kotz, Frederik; Helmer, Dorothea; Rapp, Bastian E.

doi:10.1039/d1ta03352b

Cited by 42 publications

(35 citation statements)

References 45 publications

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“…Here we demonstrate a superhydrophobic, bulk micro/nanoporous fluoropolymer foam, "Fluoropor", which we previously reported [54][55][56][57] as a promising dielectric material for EWOD and application in DMF. Fluoropor is easy to fabricate and, due to its bulk porous structure, insensitive to abrasion, as the removal of one layer of material exposes an equally structured layer of material.…”

Section: Introductionmentioning

confidence: 80%

“…To achieve superhydrophobic micro/nanoporous surfaces, we used the previously reported fluoropolymer foam Fluoropor [54][55][56]. In general, amorphous fluorinated polymers are known to be good electric insulators [58] and lend themselves for the production of dielectric layers for DMF.…”

Section: Experiments On the Wetting Behavior Under Ewod 231 Surface P...mentioning

confidence: 99%

“…Moreover, Fluoropor can retain its superhydrophobicity, even if the surface is abraded, because abrasion reveals a new layer of identical pore structures, due to the bulk porosity of the material. Fluoropor surfaces that were used to examine the wetting behavior were fabricated by 3D SLA printing as a staircase design, according to the procedure we have reported recently [56,59]. Briefly, a 3D-printable resin was prepared, which consisted of 50 wt% MD700 monomer with 35 wt% of 13FOOl (emulsifying agent), 15 wt% cyclohexanol (porogen), blended with 0.5 wt% of TPO (photoinitiator) and 0.6 wt% of Tinuvin 384-2 (absorber).…”

Section: Experiments On the Wetting Behavior Under Ewod 231 Surface P...mentioning

confidence: 99%

“…Briefly, a 3D-printable resin was prepared, which consisted of 50 wt% MD700 monomer with 35 wt% of 13FOOl (emulsifying agent), 15 wt% cyclohexanol (porogen), blended with 0.5 wt% of TPO (photoinitiator) and 0.6 wt% of Tinuvin 384-2 (absorber). The staircase design was printed on an Asiga Pico 2 SLA printer (Asiga, Alexandria, NSW, Australia) with a light intensity of 88 W m −2 utilizing the same parameters as reported previously [56,59]. The printed stacks were washed in isopropanol overnight and dried at ambient conditions for 16 h, followed by drying in a vacuum furnace at 100 • C and 50 mbar for 1 h. The washing and drying procedure was required for removal of the porogens from the polymeric network and to obtain a superhydrophobic micro-/nanostructured polymer foam.…”

Section: Experiments On the Wetting Behavior Under Ewod 231 Surface P...mentioning

confidence: 99%

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Application of Micro/Nanoporous Fluoropolymers with Reduced Bioadhesion in Digital Microfluidics

et al. 2022

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Digital microfluidics (DMF) is a versatile platform for conducting a variety of biological and chemical assays. The most commonly used set-up for the actuation of microliter droplets is electrowetting on dielectric (EWOD), where the liquid is moved by an electrostatic force on a dielectric layer. Superhydrophobic materials are promising materials for dielectric layers, especially since the minimum contact between droplet and surface is key for low adhesion of biomolecules, as it causes droplet pinning and cross contamination. However, superhydrophobic surfaces show limitations, such as full wetting transition between Cassie and Wenzel under applied voltage, expensive and complex fabrication and difficult integration into already existing devices. Here we present Fluoropor, a superhydrophobic fluorinated polymer foam with pores on the micro/nanoscale as a dielectric layer in DMF. Fluoropor shows stable wetting properties with no significant changes in the wetting behavior, or full wetting transition, until potentials of 400 V. Furthermore, Fluoropor shows low attachment of biomolecules to the surface upon droplet movement. Due to its simple fabrication process, its resistance to adhesion of biomolecules and the fact it is capable of being integrated and exchanged as thin films into commercial DMF devices, Fluoropor is a promising material for wide application in DMF.

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Section: Introductionmentioning

confidence: 80%

Section: Experiments On the Wetting Behavior Under Ewod 231 Surface P...mentioning

confidence: 99%

Section: Experiments On the Wetting Behavior Under Ewod 231 Surface P...mentioning

confidence: 99%

Section: Experiments On the Wetting Behavior Under Ewod 231 Surface P...mentioning

confidence: 99%

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Application of Micro/Nanoporous Fluoropolymers with Reduced Bioadhesion in Digital Microfluidics

et al. 2022

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“…With tremendous efforts devoted to the superwettability mechanism of organisms in nature including water striders legs [8], butterfly wings [9], rose and sunflower petals [10], lotus plant leaves [11], gecko foot [12], etc., a wide range of methods and techniques have been developed to texture hierarchical micro-/nanosized structures which can be divided into two design strategies: one is fabricated from larger-scale materials and the another is manufactured from atomic or molecular scale materials [13]. In more detail, these methods and techniques involve lithography [14], diamond cutting [15], etching [16], 3D printing [17], layer-by-layer assembly [18], selfassembly [19], sol-gel [20], and others.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Self-Cleaning Performance of Carbon-Based Superhydrophobic Coatings Based on Non-Fluorine and Non-Toxic Corn Straw

Wang

Kang

et al. 2021

Molecules

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Recently, superhydrophobic surfaces with self-cleaning ability have attracted broad research interest due to their huge potential in daily lives and industrial applications, but the use of fluorinate, toxic organic compounds, and expensive feedstocks make superhydrophobic materials a great challenge in practical application. In this study, we present a facile dip-coating strategy to prepare superhydrophobic coatings with self-cleaning properties based on a non-fluorine and non-toxic system by using eco-friendly corn straw as raw material. During this process, aromatic carbon particles with rough hierarchical structures were prepared firstly via a simple fast pyrolysis process, followed by modification with polydimethylsiloxane (PDMS) in absolute ethanol solvent to decrease the surface free energy. Research shows these natural straw-derived carbons display a microstructure of several protrusions which is similar to the lotus leave’s and the resulted coatings exhibit an outstanding superhydrophobic property with a static water contact angle (WCA) of 151.67 ± 1.36 degrees. In addition, the as-prepared coatings possessed excellent self-cleaning performance: no contaminations were observed on the surfaces after examining with sludge, calcimine, water, and common liquids such as tea, milk, soybean milk as well as ink, which have a broad range of potential application in the field of antifouling, waterproofing, and anticorrosive.

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A Real‐Time Capacitive Sensor to Detect the Stability of Salvinia Layers on Porous Superhydrophobic Polymers Under Shear

Pezeshkpour

Sachsenheimer

Goralczyk

et al. 2022

Adv Materials Technologies

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Superhydrophobicity can be achieved by combining sufficiently low surface energy with a suitable surface roughness. Repellency in such surfaces is the result of the so‐called Salvinia layer, a small layer of air trapped between the superhydrophobic surface and a wetting fluid that prevents the fluid touching the surface. The drawback of the Salvinia layer is its instability due to either shear forces or the air dissolving in the passing fluid. When the air layer is lost, the coating loses its superhydrophobic properties. The direct observation of air layer is of high interest for many applications, specially for determining its behavior under shear. Here, a real‐time study of Salvinia layer on a porous superhydrophobic polymer, Fluoropor, by means of a capacitive sensor under shear in water is presented. The initial thickness of the Salvinia layer on Fluoropor‐coated electrodes is measured and the time of degradation for three Fluoropor thicknesses 30, 50, and 75 µm using degassed and nondegassed water at two flow rates, i.e., 0.35 and 0.7 mL min−1 is quantified. The sensor quantitatively assesses that Salvinia layer degrades fast for thin Fluoropor layer under higher shear but remains stable for up to 17 h in nondegassed water for thicker layers.

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Facile fabrication of micro-/nanostructured, superhydrophobic membranes with adjustable porosity by 3D printing

Abstract: 3D printed micro/-nanostructured thin membranes with inherent adjustable porosity in the submicron range for the use as water–oil separators.

Cited by 42 publications

References 45 publications

Application of Micro/Nanoporous Fluoropolymers with Reduced Bioadhesion in Digital Microfluidics

Application of Micro/Nanoporous Fluoropolymers with Reduced Bioadhesion in Digital Microfluidics

Preparation and Self-Cleaning Performance of Carbon-Based Superhydrophobic Coatings Based on Non-Fluorine and Non-Toxic Corn Straw

A Real‐Time Capacitive Sensor to Detect the Stability of Salvinia Layers on Porous Superhydrophobic Polymers Under Shear

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