Table 2. Chemicals tested for the preparation of suitable solutions to be added to crystallization plate reservoirs for drop dehydration by vapour diffusion.
Predicted RH values could not be calculated for 14 M caesium acetate and 8 M caesium phosphate as Raoult’s law appears to break down, resulting in a negative value for the former and a value above 100 for the latter.
| Chemical | Theoretical maximum concentration (M) | Achieved maximum concentration (M) | RH for achieved maximum concentration (%) | Performance in dehydration experiments |
|---|---|---|---|---|
| NaCl | 6 | 6 | 79.5 | Too weak |
| Fructose | 20 | 8 | 58.14 | Too viscous |
| K acetate | 20 | 8 | 63.64 | Too weak |
| CsCl | 8 | 6 | 77.6 | Too weak |
| Cs acetate | 40 | 14 | N/A | Too expensive |
| Cs3 phosphate | 10 | 8 | N/A | Too weak |
| KNO2 | 25 | 10 | 60.66 | Formation of gas in combination with (NH4)2SO4 |
| Li iodide | 10 | 10 | 65.12 | OK |
| K formate | 30 | 13 | 47.77 | OK |