See here the group members.

We often have open positions, so contact us if you are interested in erasmus exchange projects, bachelor and master thesis as well as in PhD and Postdoc positions.

X-ray Photon Correlation Spectroscopy at synchrotrons and free-electron lasers

When coherent x-rays are scattered from a disordered system, they give rise to grainy diffraction patterns, called speckles. Such patterns contain information on the exact arrangement between the atoms in real space. As the spatial arrangement changes with time, the corresponding speckle pattern will also change. By recording the change in reciprocal space, we will thereby obtain information in real space. In a series of XPCS experiments we were able to probe dynamics on the order of seconds at synchrotrons and on the order of femtoseconds at free electron lasers.

Coherent X-rays reveal the influence of cage effects on ultrafast water dynamics
Nature Communications  9, 1917 (2018)

Diffusive dynamics during the high-to-low density transition in amorphous ice 
PNAS 114, 8193-8198 (2017)
 

The role of water in hydration and biophysical processes

The interplay of water and the solvated molecules, is termed hydration. Understanding hydration is related to many fundamental processes in biophysics, chemical physics, soft matter physics and atmospheric science. However, usually when discussing hydration, water is assumed as a passive homogeneous medium and its heterogeneities as a liquid are mostly ignored. How do water’s heterogeneities affect hydration? In our group we investigate the structure and dynamics of aqueous solutions, in connection to fundamental processes during phase transitions, in the supercooled and glassy states, as well as in connection to protein function.

Investigating the influence of water in lysozyme structure and dynamics using FT-IR and XRD
R. Yousif, Bachelor thesis, Stockholm University (2019)

Investigating the role of water in the protein dynamic transition
M. Bin, Master thesis, Stockholm University (2020)
 

Developing novel water desalination technologies

There are major global challenges regarding the supply of fresh water due to climate change. However, despite major innovations in water technologies, desalination is still more energy-intensive compared to conventional technologies for water treatment. Freeze desalination is an energy effective alternative to traditional desalination processes. In our group we investigate the fundamental mechanisms of freeze-desalination with the aim of optimizing desalination efficiency and gain new insights into the freezing process of aqueous solutions.

Brine rejection and hydrate formation upon freezing of NaCl aqueous solutions
Phys. Chem. Chem. Phys.,22, 7625-7632 (2020)

Research highlights

The Ultrafast Dance of Liquid Water
X-ray experiments reveal two different types of liquid water
Cryo-desalination – A nature inspired solution to obtain freshwater
Insikter I vattnets mysterier genom röntgen-laserexperiment

Acknowledgments

We would like to acknowledge the following sources for support and funding:

  • Swedish research council – Vetenskapsrådet: Starting Grant (2019-05542)
  • Swedish research council – Vetenskapsrådet: Röntgen-Ångström Cluster  (2019-06075)
  • The MaxWater network initiated by Max Planck Institutes and selected external partners 
  • The Centre for Molecular Water Science  lead by experts from DESY and several cooperation partners
  • Swiss National Science Foundation (SNSF): Early Postdoc Mobility Fellowship (P2ZHP2-148666)