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P - Technische Universiteit Eindhoven

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2. Single crystal growth of sodium sulfate heptahydrate 23<br />

background<br />

LEDs<br />

a<br />

air<br />

bubble<br />

growing<br />

hepthahydrate<br />

crystal<br />

b<br />

c<br />

x2<br />

y1<br />

y2<br />

x1<br />

5 mm<br />

Fig. 2.6: Images of sodium sulfate heptahydrate growth in a 100 µl droplet with an initial<br />

concentration of c 0 = 3.4 mole/kg. (a) Initially, the holder is filled with a sodium<br />

sulfate solution at approx. 33 ◦ C. (b) Precipitation of sodium sulfate heptahydrate<br />

is observed upon cooling when the supersolubility line is reached. (c) Crystal growth<br />

stops as the concentration reaches the heptahydrate solubility line.

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