There is increasing demand to examine specimens within a wet environment using x-ray microscopy. Liquid Environment Cells, in-situ cells, or simply liquid samples can be all studied with the assistance of a wide variety of substrate options available from Silson. Most of these are based around a transmission-cell with a liquid sealed between two high quality silicon nitride membranes. A patterned SU-8 polymer spacer is used to vary the spacing between 1 and 50 µm. Normally, membrane thickness on each side of the cell is 100 nm.
SU-8 is a epoxy-based negative photoresist, photo imageable to near UV (365nm) radiation and commonly used in the fabrication of MEMS (micro-electronic and mechanical systems). We have conducted some analysis into the chemical compatibility of organic solvents with SU-8:
Silson has the ability to customise the design on request, changing the membrane size and thickness along with the spacer design to best suit a particular application.
We can also supply 3D printed plastic holders, which hold the cell together with a screw in each corner. These holders are to load liquid samples in an in-situ holder, and also to seal samples for static studies, and a constructed standard SU-8 liquid cell will consist of:
The cross section of the above will look like the following:
We are able to 3D-print plastic static cell holders, which we can also have these holders manufactured in metal at an extra cost. These holders have a standard frame size of 10mm with a 5mm hole in the middle, meaning the membrane size can vary from <1mm to 5mm.
We are also able to 3D-print either 3-point or 4-point loading holders, designed for flowing liquids:
Please contact us if you have any questions or would like to discuss a custom designed liquid environment cell suitable for your applications!