Aarhus Universitets segl

Signe Kyrkjebø

I am a postdoctoral researcher, working in the group of Andrew Cassidy here in InterCat at Aarhus University. Currently, I am working on designing, building and testing an electron gun which will be used to study the molecular motion in water.

In my research, I am interested in studying ice nucleation and growth on surfaces on the molecular level of detail. I completed my PhD in October 2024 in InterCat under the supervision of Liv Hornekær. My PhD thesis focused on H2O and CO2 ice nucleation and growth on carbonacoues surfaces under conditions similar to that in the cold regions of the interstellar medium. Such regions were simulated in the lab in ultra-high vacuum using liquid helium to achieve cryogenic temperatures. To characterize ice nucleation and growth on the molecular level of detail, I employed experimental techniques such as low-temperature scanning tunneling microscopy (LT-STM), x-ray photoelectron spectroscopy (XPS) and helium-3 spin echo scattering (HeSE).

Before joining Aarhus University, I completed my master at the University of Bergen under the supervision of professor Bodil Holst. The main focus of my master project was to test the anti-icing properties of pristine and functionalized graphene grown on Ir(111). I first carefully prepared samples in ultra-high vacuum chambers, then measured the contact angle of a water droplet on the surfaces and the temperature which it freezes in ambient conditions. I found that by chemically modifying graphene with oxygen, the freezing onset temperature was significantly lowered compared to that of pristine graphene.  

Postdoc

sky@phys.au.dk

1520-335 Ny Munkegade 120

DK-8000 Aarhus C