University of Konstanz Develops Innovative Method to Remove Liquids

Researchers at the University of Konstanz have unveiled a groundbreaking method for collecting and removing liquids from delicate microstructures without direct contact. This innovative technique employs vapor condensation to create surface currents that efficiently transport droplets off surfaces. The findings, published on January 13, 2026, in the journal Proceedings of the National Academy of Sciences, could significantly impact industries relying on microfabrication, such as electronics and biotechnology.

Understanding the Challenges of Microfabrication

Many technologies, particularly those in the realm of electronics, depend on microscopic components like microchips. The manufacturing process for these components typically exposes them to various liquids, which must be entirely removed to ensure functionality and reliability. Stefan Karpitschka, who leads the research team, emphasizes the challenges faced during this process. “Manufacturing microchips involves complex steps that often require wet processing. For example, silicon wafers must undergo etching in acid baths and then be dried thoroughly,” he explains.

Conventional methods of removing liquids, such as wiping or boiling, are problematic. Wiping can cause damage to sensitive structures, while boiling may leave behind contaminants. Karpitschka’s team sought a more refined approach that could protect the integrity of these fragile materials.

Harnessing Surface Tension for Liquid Removal

The research team developed a contact-free method that utilizes the Marangoni force, a phenomenon that arises from differences in surface tension. Karpitschka describes it as a “tug-of-war”: when adjacent areas of a surface exhibit varying tension levels, the stronger side pushes the weaker one, effectively moving liquids along the surface.

To create the necessary difference in surface tension, the team introduced additional liquid during their experiments. By evaporating alcohol, which has a lower surface tension than water, they generated vapor that condenses on the existing liquid. This process creates the desired tension difference, allowing liquids to be moved across the surface. “We guide the resulting currents to gather tiny amounts of liquid into larger droplets,” Karpitschka explains. This method mirrors how raindrops coalesce on a window, but with precise control over the droplets’ movement.

The implications of this research extend across various fields that utilize micropatterned surfaces. The ability to dry small structures without damage enhances the production efficiency of micro- and nanomaterials, potentially leading to advancements in numerous applications, from electronics to pharmaceuticals.

The study offers a promising solution to a persistent challenge in the manufacture of microcomponents, highlighting the importance of continued innovation in material science and engineering. With further development, this technique could streamline processes in industries where precision is paramount.

For those interested in the technical details, the study is documented in the article titled “Vapor-mediated wetting and imbibition control on micropatterned surfaces.” This research not only underscores the University of Konstanz’s commitment to scientific advancement but also marks a significant step forward in the quest for more efficient manufacturing processes.