Organoclays prepared from montmorillonites with different cation exchange capacity and surfactant configuration

He, Hongping; Ma, Yuanyuan; Zhu, Jianxi; Yuan, Peng; Qing, Yanhong

doi:10.1016/j.clay.2009.11.024

Cited by 241 publications

(133 citation statements)

References 33 publications

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“…For pristine Mt, the basal spacing increased with the increase in the intercalated surfactant amount (Fig. 4a), similar to those reported in the literature [9,30]. When the CTAB concentration increased to 2.0 CEC, the maximum basal spacing reached 3.74 nm.…”

Section: Resultssupporting

confidence: 88%

“…The methods used for modifying clay minerals mainly include exchange of the inherent interlayer cations with cationic surfactants [8,9], grafting clay minerals surfaces with silanes [10][11][12], and using silanes as silicon source in the synthesis of clay minerals [13,14]. Silane grafting, also known as silylation, was proven to be an efficient method to modify clay minerals surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Silylation of montmorillonite surfaces: Dependence on solvent nature

et al. 2013

Journal of Colloid and Interface Science

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Silylation of montmorillonite surfaces: Dependence on solvent nature

et al. 2013

Journal of Colloid and Interface Science

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“…Hence, during the last decades, a number of studies were conducted using different families of clay minerals and surfactants with different configurations to synthesize organoclays [1][2][3][4][5][6][7]. In those studies, most attentions were paid on the thermal properties and the interlayer structure of the obtained organoclays.…”

Section: Introductionmentioning

confidence: 99%

“…In our recently published paper [6], we have discussed in detail about the influences of montmorillonite's CEC and surfactant configuration on the basal spacing. Therein, we reported that the basal spacing of the organo-montmorillonites increased with surfactant loading, while the maximum basal spacing increased as the alkyl chain length of the surfactant increased.…”

Section: Introductionmentioning

confidence: 99%

The influence of alkyl chain length on surfactant distribution within organo-montmorillonites and their thermal stability

Zhu

Shen

et al. 2011

J Therm Anal Calorim

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Organically modified clay minerals with high thermal stability are critical for synthesis and processing of clay-based nanocomposites. Two series of organo-montmorillonites have been synthesized using surfactants with different alkyl chain length. The organo-montmorillonites were characterized by X-ray diffraction and differential thermogravimetry, combining with molecule modelling. For surfactant with relatively short alkyl chain, the resultant organo-montmorillonite displays a small maximum basal spacing (ca. 1.5 nm) and most surfactants intercalate into montmorillonite interlayer spaces as cations with a small amount of surfactant molecules loaded in the interparticle pores with ''house-of-cards'' structure. However, for surfactant with relatively long alkyl chain, the resultant organo-montmorillonite displays a large maximum basal spacing (ca. 4.1 nm) and the loaded surfactants exist in three formats: intercalated surfactant cations, intercalated surfactant molecules (ionic pairs), and surfactant molecules in interparticle pores. The surfactant molecules (ionic pairs) in interparticle pores and interlayer spaces will be evaporated around the evaporation temperature of the neat surfactant while the intercalated surfactant cations will be evaporated/decomposed at higher temperature.

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“…However, the guest drugs adapted to this technique are usually limited to ionic drug molecules, such as vitamin B 1 [18], buformin hydrochloride [19], and ibuprofen sodium salt [20,21]. The interlayer space of the montmorillonite is approximately 0.3-0.5 nm and reaches up to approximately 4.5 nm in organoclays [22]. The small interlayer space is therefore unsuitable for high-capacity loading of guest molecules, especially for nonionic drugs at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%