Dr. Gustav Graeber
Profil
Zusammenfassung
Dr. Gustav Graeber entwickelt Materialien und Oberflächentechnologien für zwei Hauptanwendungen: Batterien mit hoher Energiedichte (insbesondere Natrium-Schwefel- und Natrium-Metall-Batterien) sowie Systeme zur Wasserdampfaufnahme aus der Luft mittels Hydrogelen. Seine Expertise liegt in der Kontrolle von Grenzflächenprozessen — wie Tropfendynamik, Benetzungsverhalten und Ionentransport — um diese für praktische Energiespeicherung und Wasserharvesting nutzbar zu machen.
Skills
Stammdaten
Identität, Organisation und Kontakt aus HU-FIS.
Forschungsthemen4
Anodenfreie Natrium- und Kalium-Metall-Batterien durch Alkalimetall-Benetzungsstrategien
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 03/2023 - 02/2028 Projektleitung: Dr. Gustav Graeber
Effiziente Hochtemperatur-Natrium-Schwefel-Batterien
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 05/2026 - 04/2029 Projektleitung: Dr. Gustav Graeber, Prof. Dr. Philipp Adelhelm
Effiziente Hochtemperatur-Natrium-Schwefel-Batterien
Quelle ↗Förderer: Bundesministerium für Forschung, Technologie und Raumfahrt Zeitraum: 05/2026 - 04/2029 Projektleitung: Dr. Gustav Graeber, Prof. Dr. Philipp Adelhelm
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Publikationen25
Top 25 nach Zitationen — Quelle: OpenAlex (BAAI/bge-m3 embedded für Matching).
Nature · 470 Zitationen · DOI
Nature Communications · 198 Zitationen · DOI
A liquid droplet dispensed over a sufficiently hot surface does not make contact but instead hovers on a cushion of its own self-generated vapor. Since its discovery in 1756, this so-called Leidenfrost effect has been intensively studied. Here we report a remarkable self-propulsion mechanism of Leidenfrost droplets against gravity, that we term Leidenfrost droplet trampolining. Leidenfrost droplets gently deposited on fully rigid surfaces experience self-induced spontaneous oscillations and start to gradually bounce from an initial resting altitude to increasing heights, thereby violating the traditionally accepted Leidenfrost equilibrium. We found that the continuously draining vapor cushion initiates and fuels Leidenfrost trampolining by inducing ripples on the droplet bottom surface, which translate into pressure oscillations and induce self-sustained periodic vertical droplet bouncing over a broad range of experimental conditions.
Advanced Materials · 172 Zitationen · DOI
Abstract Hygroscopic hydrogels are emerging as scalable and low‐cost sorbents for atmospheric water harvesting, dehumidification, passive cooling, and thermal energy storage. However, devices using these materials still exhibit insufficient performance, partly due to the limited water vapor uptake of the hydrogels. Here, the swelling dynamics of hydrogels in aqueous lithiumchloride solutions, the implications on hydrogel salt loading, and the resulting vapor uptake of the synthesized hydrogel–salt composites are characterized. By tuning the salt concentration of the swelling solutions and the cross‐linking properties of the gels, hygroscopic hydrogels with extremely high salt loadings are synthesized, which enable unprecedented water uptakes of 1.79 and 3.86 gg −1 at relative humidity (RH) of 30% and 70%, respectively. At 30% RH, this exceeds previously reported water uptakes of metal–organic frameworks by over 100% and of hydrogels by 15%, bringing the uptake within 93% of the fundamental limit of hygroscopic salts while avoiding leakage problems common in salt solutions. By modeling the salt‐vapor equilibria, the maximum leakage‐free RH is elucidated as a function of hydrogel uptake and swelling ratio. These insights guide the design of hydrogels with exceptional hygroscopicity that enable sorption‐based devices to tackle water scarcity and the global energy crisis.
Kooperationen1
Bestätigte Forscher↔Partner-Paare aus HU-FIS — Gold-Standard-Positive für das Matching.
Effiziente Hochtemperatur-Natrium-Schwefel-Batterien
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