2019-08-29T11:55:21 n290

Graphs from a study of the thermal characterization of surfactant-modified montmorillonites

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The montmorillonite (HM) was obtained from Hebei, China. The sample was purified by sedimentation and the <2 μm fraction was collected and dried at 90°C. The sample was ground through a 200 mesh sieve and sealed in a glass tube for use. As indicated by XRD (Zhu, J.X., He, H.P., Guo, J.G., Yang, D. and Xie, X.D. (2003) Arrangement models of alkylammonium cations in the interlayer of HDTMA+ pillared montmorillonite. Chinese Science Bulletin, 48, 368–372.), the montmorillonite collected contains minor illite and kaolinite. The CEC is 57.9 meq/100 g. The structural formula is [Na0.05Ca0.18Mg0.10] [Al1.58Fe0.03Mg0.39][Si3.77Al0.23]O10(OH)2·nH2O. The surfactant used in this study, provided by YuanJu Chem. Co., China, is hexadecyltrimethylammonium bromide (HDTMAB) with a purity of 99%.

Figure 1 shows DTA (Differential Thermal Analysis) and TG (Thermogravimetric) curves of (a) Na montmorillonite and (b) of neat HDTMAB.  Figure 2 shows the DTA curves of the modified montmorillonites with different surfactant-packing density.  Figure 3 is the DSC (Differential Scanning Caloimetry) curves of the neat surfactant and HM0.5 CEC, HM1.9 CEC, HM5.0 CEC. Figure 4 is the DSC curves of (a) HM1.9 CEC and (b) HM5.0 CEC, with three cycles of heating and cooling. Figure 5 TG curves of the modified montmorillonites with different surfactant-packing densities.  Figure 6 shows the change in the surfactant decomposition temperature for modified montmorillonite as a function of the surfactant-packing density within the montmorillonite interlayer. The surfactant-packing density refers to the amount of the surfactant within the montmorillonite interlayer as shown in Table 1 of the associated text.

Geographical area of data collection

119.871078,42.619718 113.465369,42.619718 113.465369,36.048207 119.871078,36.048207 119.871078,42.619718


He Hongping, Ding Zhe, Zhu Jianxi, Yuan Pen, Yunfei Xi, Yang Dan and Ray L. Frost Thermal characterization of surfactant-modified montmorillonites Clays and Clay Minerals(June 2005), 53(3):287-293 http://dx.doi.org/10.1346/CCMN.2005.0530308

Research areas

Differential Thermal Analysis
Differential Scanning Caloimetry
Surfactant-modified Montmorillonite
Thermal Stability

Cite this collection

He, H; Ding, Z; Zhu, J; Yuan, P; Xi, Y; Yang, D; Frost, R (2015): Graphs from a study of the thermal characterization of surfactant-modified montmorillonites. Queensland University of Technology. (Image) https://doi.org/10.4225/09/586b239977472

Data file types

Online figures, GeoScienceWorld


© 2005, The Clay Minerals Society


Has association with
Ray Frost  (Researcher)
Yunfei Xi  (Researcher)


Name: Hongping He


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Published - Open Access