Bio

Project scientist in the Bio department at the LCLS (SLAC National Accelerator Laboratory). Joined LCLS 2022 as a research associate, after obtaining a PhD (Dr.-Ing.) at TU Darmstadt in 2021, focusing on electrokinetic phenomena in fluid flow. At LCLS, focusing on development of droplet on demand sample delivery methods for time-resolved experiments, both for optical pump and mixing experiments.

Skills and experience in fluid mechanics and X-ray science: Design, control and optimization of DoD sample delivery platform at LCLS. Microfluidic and electric equipment control and operation. Laboratory based experiments (high-speed imaging, brightfield - and fluorescence imaging and evaluation. X-ray based measurement techniques: Solution phase scattering experiments, X-ray spectroscopy. Computational modeling using COMSOL Multiphysics.

Education & Certifications

  • Dr.-Ing., TU Darmstadt, Mechanical Engineering - Nano- and Microfluidics (2021)
  • M.Sc., TU Darmstadt, Mechanical and Process Engineering (2017)
  • B.Sc., TU Darmstadt, Mechanical and Process Engineering (2014)

Contact

  • Work
    sdehe@stanford.edu
    University - Staff Department: SLAC National Accelerator Laboratory Position: Project Scientist
    • 2575 Sand Hill Rd
    • Mailstop 0019
    • Menlo Park,  California  94025 

Additional Info

All Publications

  • The spatial structure of electrostatically forced Faraday waves JOURNAL OF FLUID MECHANICS Dehe, S., Hartmann, M., Bandopadhyay, A., Hardt, S. 2022; 939

    View details for DOI 10.1017/jfm.2022.163

    View details for Web of Science ID 000772006300001

  • Deformation modes of an oil-water interface under a local electric field: From Taylor cones to surface dimples PHYSICAL REVIEW FLUIDS Dehe, S., Hardt, S. 2021; 6 (12)

    View details for DOI 10.1103/PhysRevFluids.6.123702

    View details for Web of Science ID 000736652400002

  • Hydrodynamic dispersion in Hele-Shaw flows with inhomogeneous wall boundary conditions JOURNAL OF FLUID MECHANICS Dehe, S., Rehm, I., Hardt, S. 2021; 925

    View details for DOI 10.1017/jfm.2021.648

    View details for Web of Science ID 000687285800001

  • Intermediate States of Wetting on Hierarchical Superhydrophobic Surfaces LANGMUIR Rofman, B., Dehe, S., Frumkin, V., Hardt, S., Bercovici, M. 2020; 36 (20): 5517-5523

    Abstract

    Wetting transition on superhydrophobic surfaces is commonly described as an abrupt jump between two stable states-either from Cassie to Wenzel for nonhierarchical surfaces or from Cassie to nano-Cassie on hierarchical surfaces. We here experimentally study the electrowetting of hierarchical superhydrophobic surfaces composed of multiple length scales by imaging the light reflections from the gas-liquid interface. We present the existence of a continuous set of intermediate states of wetting through which the gas-liquid interface transitions under a continuously increasing external forcing. This transition is partially reversible and is limited only by localized Cassie to Wenzel transitions at nanodefects in the structure. In addition, we show that even a surface containing many localized wetted regions can still exhibit extremely low contact angle hysteresis, thus remaining useful for many heat transfer and self-cleaning applications. Expanding the classical definition of the Cassie state in the context of hierarchical surfaces, from a single state to a continuum of metastable states ranging from the centimeter to the nanometer scale, is important for a better description of the slip properties of superhydrophobic surfaces and provides new considerations for their effective design.

    View details for DOI 10.1021/acs.langmuir.0c00499

    View details for Web of Science ID 000537681700005

    View details for PubMedID 32337996

  • Electro-osmotic flow enhancement over superhydrophobic surfaces PHYSICAL REVIEW FLUIDS Dehe, S., Rofman, B., Bercovici, M., Hardt, S. 2020; 5 (5)

    View details for DOI 10.1103/PhysRevFluids.5.053701

    View details for Web of Science ID 000573801600002

https://orcid.org/0000-0002-9206-9106