The instrument was previously calibrated using Indium 99.99% purity, m.p. ¼ 156.6 C, DH ¼ 28.56 J g1 The samples were heated from 30 C to 600 C using an aluminum crucible with a pierced lid with a 1.0 mm diameter orifice and approximately 4 mg of each sample under an air flow rate of 150 mL min1 at a heating rate of 10 C min1.เส้นโค้ง DSC จะใช้ DSC-Q200 (TA Instruments, USA)