Synthesis and Characterization of Hdtma-Organoclays: Insights Into Their Structural Properties

Naranjo, Pablo Matias; Molina, Jose Ramon; Sham, Edgardo Ling; Torres, Elsa Mónica Farfán

doi:10.5935/0100-4042.20140302

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…Corroborating the results obtained with FTIR [3,25,34,38,39], the DSC peak corresponding to the 'fusion' was not observed at low SL values because the adsorbed surfactant presented a liquid-like arrangement, i.e., a 'molten' state. On the other hand, at a SL >1 the adsorbed surfactant presented a solid-like arrangement and hence it showed the 'fusion' peak at the corresponding temperature in the DSC curve.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 61%

“…On the other hand, at a SL >1 the adsorbed surfactant presented a solid-like arrangement and hence it showed the 'fusion' peak at the corresponding temperature in the DSC curve. Previous studies show that at a SL > 1 the surfactant fills the mesopores of the sample as well, in addition to the surfactant intercalated at the interlayer space of the clay mineral [3,25]. However, it is not clear enough if the solid-like arrangement was produced at the interlayer space or inside the mesopores.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 93%

“…Values tend towards the onset combustion temperature of the pure surfactant (97% purity). Previously published studies have shown that alkyl ammonium salts adsorb to smectites mainly through two mechanisms: cation exchange and Van der Waals interactions between the carbon chains of the surfactants [3,25]. At low SL, the main clay-surfactant interaction mechanism is a cation exchange.…”

Section: Thermogravimetric Analysis and Differential Thermal Analysismentioning

confidence: 97%

“…Recently, organoclays have been widely studied because of their great academic and technological interest [1][2][3]. This material is obtained by interaction between a clay and a generally cationic, organic component.…”

Section: Introductionmentioning

confidence: 99%

“…Caused by the notable difference in the properties of these components, it is relatively easy to identify independently the data corresponding to each component. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy, thermogravimetric analysis (TG), thermal differential analysis (DTA) and differential scanning calorimetry (DSC) techniques are widely used in the characterization of organoclays [3,[20][21][22][23][24][25][26]. Particularly the thermal techniques provide a wealth of information [5,[27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of hexadecyltrimethylammonium-organoclay and its individual components by thermal techniques

2017

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The properties of the materials determine their potential applications. The aim of this article is to study the properties of the organoclays using simple and rapid technologies. Organoclays with different surfactant loadings (SL) were synthesized using an Argentine bentonite with a high content of montmorillonite (Bent) and hexadecyltrimethylammonium bromide as cationic surfactant. The samples were characterized using thermal techniques. The results revealed that the hydrophilicity of the organoclays decreases with increasing SL until the SL reaches 0.8 times the cation exchange capacity of the clay; and remains constant at a higher surfactant load. The stability of organoclays was inversely proportional to the SL of each sample. The layers showed a stabilization of approximately 40 • C for their structural transformation temperature, caused by the presence of the surfactant. In addition, at a SL <1.0 the surfactant presented a 'liquid-like' structure in the interlayer space, whereas at a SL >1.0 the structure was 'solid-like'.

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