Explanipedia

Cryogenic propellant management in space: open challenges and perspectives Open

Alessia Simonini, Michael Dreyer, Annafederica Urbano, Francesco Sanfedino, Takehiro Himeno , et al. · 2024

Phase Separation through Screen Channel Liquid Acquisition Devices in Microgravity Open

Prithvi Shukla, Michael Dreyer · 2024

To enable future deep space exploration, orbital refueling of spacecraft is essential. However, transferring liquid in a microgravity environment is a complex process dependent on various factors. One of the basic and critical tasks is to …

Depressurization induced vapor bubble growth in liquid methane during microgravity Open

Niklas H. Weber, Michael Dreyer · 2023

Depressurization and re-pressurization maneuvers are used for cryogenic propellants in spacecraft tanks to mitigate the incoming heat flow and to maintain an appropriate net positive suction head (NPSH). A depressurization maneuver can be …

Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride Open

Hang Chi, Yunbo Ou, Tim B. Eldred, Wenpei Gao, Sohee Kwon , et al. · 2023

Magnetic transition metal chalcogenides form an emerging platform for exploring spin-orbit driven Berry phase phenomena owing to the nontrivial interplay between topology and magnetism. Here we show that the anomalous Hall effect in pristi…

Experimental Investigation of Liquid Interface Stability During the Filling of a Tank in Microgravity Open

Sesha N. C. Govindan, Michael Dreyer · 2023

The storage of propellants in space as well as the transfer and filling of spacecraft tanks is a prerequisite for future long-term space exploration missions. In this work, the vented filling of a partially filled tank, which is envisioned…

SiOC Screens with Aligned and Adjustable Pore Structure for Screen Channel Liquid Acquisition Device Open

Pedro Henrique da Rosa Braun, Prithvi Shukla, Kurosch Rezwan, Michael Dreyer, Michaela Wilhelm · 2023

The development of porous ceramic screens with high chemical stability, low density, and thermal conductivity can lead to promising screen channel liquid acquisition devices (SC-LADs) for propellant management under microgravity conditions…

Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride Open

Hang Chi, Yunbo Ou, Tim B. Eldred, Wenpei Gao, Sohee Kwon , et al. · 2022

Magnetic transition metal chalcogenides form an emerging platform for exploring spin-orbit driven Berry phase phenomena owing to the nontrivial interplay between topology and magnetism. Here we show that the anomalous Hall effect in pristi…

Imaging three phases of iodine on Ag (111) using low-temperature scanning tunneling microscopy Open

Michael Dreyer, Joseph F. Murray, Esther Frederick, Robert Butera · 2022

B-Doped δ-Layers and Nanowires from Area-Selective Deposition of BCl<sub>3</sub> on Si(100) Open

Kevin Dwyer, Sung-Ha Baek, Azadeh Farzaneh, Michael Dreyer, J. R. Williams , et al. · 2021

Atomically precise, δ-doped structures forming electronic devices in Si have been routinely fabricated in recent years by using depassivation lithography in a scanning tunneling microscope (STM). While H-based precursor/monatomic resist ch…

Phase Separation in Porous Media Integrated Capillary Channels Open

Kamal S. Bisht, Michael Dreyer · 2020

Phase separation in space is critical for gas-free propellant supply, life support systems, refueling of spacecraft in low earth orbit (LEO), and for deep space exploration missions. In the absence of gravity, the stability of the liquid-g…

Experimental detection of surface spin-polarized electron accumulation in topological insulators using scanning tunneling microscopy Open

S. Tyagi, Michael Dreyer, David Bowen, Dan Hinkel, Patrick J. Taylor , et al. · 2020

Spin-momentum locking in the surface mode of topological insulators (TI) leads to the surface accumulation of spin-polarized electrons caused by bias current flows through TI samples. Here, we demonstrate that scanning tunneling microscopy…

Solution based freeze cast polymer derived ceramics for isothermal wicking - relationship between pore structure and imbibition Open

Daniel Schumacher, Dawid Zimnik, Michaela Wilhelm, Michael Dreyer, Kurosch Rezwan · 2019

Besides conventional applications for porous monoliths such as filtration, open porosity enables capillary transport. For this application, porous polymer-derived ceramic monoliths (SiOC) with different pore morphology and porosity were ob…

STM-Induced Desorption and Lithographic Patterning of Cl–Si(100)-(2 × 1) Open

Kevin Dwyer, Michael Dreyer, Robert Butera · 2019

A scanning tunneling microscope (STM) was used to investigate tip-induced chlorine desorption and lithographic patterning of Cl-terminated Si(100)-(2 × 1) surfaces from 4 to 600 K in ultrahigh vacuum. Until now, STM lithography has exclusi…

Study Of Surface Spin-Polarized Electron Accumulation In Topological Insulators Using Scanning Tunneling Microscopy Open

S. Tyagi, Michael Dreyer, David Bowen, Dan Hinkel, Patrick J. Taylor , et al. · 2019

The results of scanning tunneling microscopy experiments using iron-coated tungsten tips and current-carrying bismuth selenide ($Bi_2Se_3$) samples are reported. Asymmetry in tunneling currents with respect to the change in the direction o…

Hugo Preuß, die DDP und Versailles Open

Michael Dreyer · 2019

Jahrbuch zur Liberalismus-Forschung , Seite 113 - 130

Coulomb blockade regions in sputter-deposited titanium nitride films Open

Michael Dreyer, Peng Xu, Kevin Osborn, Robert Butera · 2018

We present topographic and spectroscopic scanning tunneling microscopy measurements taken on a 21 nm thick TiN film at a temperature of 4.2 K -- above the superconducting transition temperature (T_c = 3.8 K) of the sample. The film was pol…

On Local Sensing of Spin Hall Effect in Tungsten Films by Using STM-Based Measurements Open

Ting Xie, Michael Dreyer, David Bowen, Dan Hinkel, Robert Butera , et al. · 2018

The spin Hall effect in tungsten films has been experimentally studied by using STM-based measurements. These measurements have been performed by using tungsten and iron coated tungsten tips. In the case of tungsten tips, it has been obser…

Scanning tunneling microscopy measurements of the spin Hall effect in tungsten films by using iron-coated tungsten tips Open

Ting Xie, Michael Dreyer, David Bowen, Dan Hinkel, Robert Butera , et al. · 2017

Scanning tunneling microscopy experiments using iron-coated tungsten tips and current-carrying tungsten films have been conducted. An asymmetry of the tunneling current with respect to the change of the direction of the bias current throug…

A scanning tunneling microscopy based potentiometry technique and its application to the local sensing of the spin Hall effect Open

Ting Xie, Michael Dreyer, David Bowen, Dan Hinkel, Robert Butera , et al. · 2017

A scanning tunneling microscopy based potentiometry technique for the measurements of the local surface electric potential is presented. A voltage compensation circuit based on this potentiometry technique is developed and employed to main…

A scanning tunneling microscopy based potentiometry technique and its application to the local sensing of the spin Hall effect Open

Ting Xie, Michael Dreyer, David Bowen, Dan Hinkel, Robert Butera , et al. · 2017

A scanning tunneling microscopy based potentiometry technique for the measurements of the local surface electric potential is presented and illustrated by experiments performed on current-carrying thin tungsten films. The obtained results …

Capillary Channel Flow (CCF) EU2-02 on the International Space Station (ISS): An Experimental Investigation of Passive Bubble Separations in an Open Capillary Channel Open

Mark Weislogel, Andrew Wollman, Ryan Jenson, John Geile, John F. Tucker , et al. · 2015

It would be signicantly easier to design fluid systems for spacecraft if the fluid phases behaved similarly to those on earth. In this research an open 15:8 degree wedge-sectioned channel is employed to separate bubbles from a two-phase fl…

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