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. 2019 Jan 27;8(2):30. doi: 10.3390/antiox8020030

Table 1.

TGA data of pristine (HNT) and modified (HNT/AH2) halloysite, along with plain ascorbic acid (AH2) and reference AH2 + HNT physical mixtures.

Samples Moisture Content (wt%) 1 Weight Loss from 130 to 800 °C (wt%) 2 Estimated AH2 Fraction (%) 3
HNT 2.60 ± 0.05 13.80 ± 0.05 0
HNT/AH2 2.10 ± 0.05 18.40 ± 0.05 4.6 ± 0.1
M-1.0:AH2 + HNT 2.00 ± 0.05 15.00 ± 0.05 1.2 ± 0.1
M-4.4:AH2 + HNT 2.20 ± 0.05 18.20 ± 0.05 4.4 ± 0.1

1 Weight loss determined by TGA in nitrogen atmosphere (heating rate 10 °C/min) from RT to 130 °C and after an isotherm at 130 °C for 40 min. 2 Weight loss determined by TGA in air (heating rate 10 °C/min) from 130 to 800 °C, 3 Weight loss determined by TGA subtracting the HNT weight change in the range 130–800 °C (13.8%) from the AA modified HNT weight change in the range 130–800 °C.