2.5. Turbidity measurements
Turbidity measurements were performed on cooling from 70 ◦C
to 0 ◦C at 0.5 ◦C/min using a TU-1900 UV/vis Spectrophotometer
(Persee, China) equipped with a temperature-controlling cell
holder under nitrogen gas. The wavelength used was 500 nm, and
the optical path length was 1 cm. The temperature was controlled
by a Peltier device within ±0.1 ◦C.