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25 results on '"Goralczyk, Andreas"'

6. 3d Printed Elastic Fluoropolymer with High Stretchability and Enhanced Chemical Resistance for Microfluidic Applications

Author

Song, Qingchuan, primary, Hamza, Ahmed, additional, Li, Chengzhi, additional, Sedeky, Abanoub S., additional, Chen, Yunong, additional, Zhu, Mingshen, additional, Goralczyk, Andreas, additional, Mayoussi, Fadoua, additional, Zhu, Pang, additional, Hou, Peilong, additional, Piesold, Christian, additional, Helmer, Dorothea, additional, Rapp, Bastian E., additional, and Kotz-Helmer, Frederik, additional

Published
2023
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13. Spray‐Coating of Superhydrophobic Coatings for Advanced Applications.

Author

Goralczyk, Andreas, Savicheva, Sofya, Montazeri, Ramin, Fine, Simona, Mayoussi, Fadoua, Zhu, Pang, Steffen, Kay, Kotz-Helmer, Frederik, Helmer, Dorothea, and Rapp, Bastian E.

Subjects
SURFACE coatings, MEMBRANE separation, POROUS materials, THERMAL resistance, PHOTOPOLYMERIZATION
Abstract

Superhydrophobic coatings are widely applicable, e.g., as self‐cleaning surfaces or water–oil separation membranes, yet their wider usage is impeded due to costs of fabrication, size, or substrate limitation. Spray‐coating is a versatile coating procedures and might offer a good solution for the fabrication of these superhydrophobic coatings, due to the fact that coatings can be fabricated on various materials in a simple, fast, and inexpensive manner. Most procedures rely on hybrid coatings of hydrophobized nanoparticles and a polymeric matrix, which have several drawbacks including the easy loss of nanoparticles and difficult waste handling. Here, the fabrication of the superhydrophobic material, called Fluoropor, for the first time, by spray‐coating on various substrates including metals, tissues, concrete, and glass is presented. It is fabricated by spray‐coating a mixture of a highly fluorinated monomer blended with porogens followed by photopolymerization. The superhydrophobicity of the material relies on the porous structure on the micro‐/nanoscale across the bulk material and does not require any nanoparticles. Excellent self‐cleaning ability of these coatings, resistance against thermal and abrasive impact, and their application as oil–water separation membranes are shown. This versatile applicability is highly promising for real‐world application as self‐cleaning coatings or oil–water separating membranes. [ABSTRACT FROM AUTHOR]

Published
2023
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14. A Polystyrene Photoresin for Direct Lithography of Microfluidic Chips

Author

Franco Corredor, Santiago, primary, Mayoussi, Fadoua, additional, Luitz, Manuel, additional, Kick, Andrea, additional, Goralczyk, Andreas, additional, Böcherer, David, additional, Vera, Grace, additional, Helmer, Dorothea, additional, Kotz‐Helmer, Frederik, additional, and Rapp, Bastian E., additional

Published
2022
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17. In SituActuators with Gallium Liquid Metal Alloys and Polypyrrole-Coated Electrodes

Author

Bhagwat, Sagar, Goralczyk, Andreas, Luitz, Manuel, Sharieff, Lathif, Kluck, Sebastian, Hamza, Ahmed, Nekoonam, Niloofar, Kotz-Helmer, Frederik, Pezeshkpour, Pegah, and Rapp, Bastian E.

Abstract

Gallium liquid metal alloys (GLMAs) such as Galinstan and gallium–indium eutectic (EGaIn) are interesting materials due to their high surface tensions, low viscosities, and electrical conductivities comparable to classical solid metals. They have been used for applications in microelectromechanical systems (MEMS) and, more recently, liquid metal microfluidics (LMMF) for setting up devices like actuators. However, their high tendency to alloy with the most common metals used for electrodes such as gold (Au), platinum (Pt), titanium (Ti), nickel (Ni), and tungsten–titanium (WTi) is a major problem limiting the scaleup and applicability, e.g., liquid metal actuators. Stable electrodes are key elements for many applications and thus, the lack of an electrode material compatible with GLMAs is detrimental for many potential application scenarios. In this work, we study the effect of actuating Galinstan on various solid metal electrodes and present an electrode protection methodology that, first, prevents alloying and, second, prevents electrode corrosion. We demonstrate reproducible actuation of GLMA segments in LMMF, showcasing the stability of the proposed protective coating. We investigated a range of electrode materials including Au, Pt, Ti, Ni, and WTi, all in aqueous environments, and present the resulting corrosion/alloying effects by studying the interface morphology. Our proposed protective coating is based on a simple method to electrodeposit electrically conductive polypyrrole (PPy) on the electrodes to provide a conductive alloying-barrier layer for applications involving direct contact between GLMAs and electrodes. We demonstrate the versatility of this approach by direct three-dimensional (3D) printing of a 500 μm microfluidic chip on a set of electrodes onto which PPy is electrodeposited in situfor actuation of Galinstan plugs. The developed protection protocol will provide a generic, widely applicable strategy to protect a wide range of electrodes from alloying and corrosion and thus form a key element in future applications of GLMAs.

Published
2023
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