Electron Microscopy imaging was performed on fixed samples. Crystals formed in sealed capillaries were fixed by immersing the capillaries in a deionized water bath and carefully removing the sealant (wax or epoxy). The capillaries were then left undisturbed in the deionized water to allow the salt to diffuse into the water bath. After a few days, ion exchange resin (AmberLite MB from MilliporeSigma) was added to the samples to remove all remaining ions from the system. This ion removal process lasted for another 3-4 days, during which the water bath was changed daily. To recover the fixed crystals, the capillaries were scored with a glass cutter and carefully broken underwater. The broken capillaries were taped onto SEM stubs (Ted Pella) using conductive carbon adhesive tabs (Electron Microscopy Science), airdried, and coated with 3-5 nm of iridium using a Cressington 208HR high-resolution sputter coater. The samples were then imaged using a MERLIN field emission scanning electron microscope (Carl Zeiss).