2nd Version#

HGW Setup#

  • OU / Helen Fraser


Fig. 54 source:#

The purpose of this experiment is to produce ยตm HGW ice particles. This is achieved by spraying ยตm water droplets in liquid ethane, the most suited cryoliquid to achieve high cooling rates. This is a technique used in cryobiologie to freeze biological samples.


Hence, this setup could open the doors for sample preparation that extend far beyond the scope of astronomy!

  • Important to mention for business case

Initial results#

Neutron Scattering


Fig. 55 source:#

Optical Microscopy


Fig. 56 source:#

Initial Neutron scattering results show that our ices present some amorphicity.

Ice manipulation#

One of the most difficult aspect when dealing with amorphous ices is that when pulled out of their cold medium, they will very quickly warm up and crystalise. Having an in-house characerision technique is the best option to mitigate those problems

Inside Glove box


Fig. 57 source:#



Fig. 58 source:#

Prep chamber

I have been working with Anita on achieving accoustic levitation within a cooled Glove-box. This could be handed to the EM-suite for sample preparation.


Ask me more if you need

Experimental limitations

  • Particles need to remain at liquid nitrogen temperature or they will crystalise

  • Ethane is present so may be best to have a prep lab in-house