Modification of montmorillonite surfaces using a novel class of cationic gemini surfactants

Zhou, Limei; Chen, Hua; Jiang, Xiaohui; Fang, Lu; Zhou, Yafen; Yin, Wenmin; Ji, Xiaoling

doi:10.1016/j.jcis.2008.12.051

Cited by 174 publications

(85 citation statements)

References 22 publications

(36 reference statements)

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“…This indicates that the surface energy of MMT was decreased due to insertion of the intercalation agent, and the hydrophilic silicate surface was converted to a hydrophobic one. 26 The interlayer water of MMT was eliminated from 473 K to 503…”

Section: Analysis Of Ommtmentioning

confidence: 99%

Organic modification of montmorillonite and effect of catalytic selectivity on the dimerization of unsaturated fatty acid

Huang¹,

Yin²,

Feng³

2018

Turk J Chem

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This study describes the selective synthesis of C 36 -dimer fatty acids, by reacting unsaturated fatty acid at 533 K for 6 h in the presence of montmorillonite and lithium chloride as the catalyst and cocatalyst, respectively. The catalytic performance of different montmorillonite and organic modified montmorillonite catalysts was investigated in the dimerization of technical grade unsaturated fatty acid, and the influence of the catalyst structure and composition on the catalytic performance was analyzed. All the samples were characterized by X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscope (SEM), transmission electron microscopy (TEM), thermogravimetry (TG), and dispersion experiments. The results show that the layer spacing and dispersion property of the montmorillonite crystal have important effects on its catalytic performance and the yield of the product. In the dimerization experiments, the maximum yield of the dimer acid is found to be 70.15%, while the lowest yield is 32.37%.It is thought that the larger interlayer spacing in the montmorillonite provides more reaction space for the unsaturated fatty acid, allows the generation of a large volume of dimeric molecules, and helps the product molecules to diffuse out from the layered structure.

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Section: Analysis Of Ommtmentioning

confidence: 99%

Organic modification of montmorillonite and effect of catalytic selectivity on the dimerization of unsaturated fatty acid

Huang¹,

Yin²,

Feng³

2018

Turk J Chem

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“…In comparison with neat MMT organoclay has got less free water in the modified MMT. This is caused by N-heptaquinolinum which reduces the surface energy of the inorganic material, and converts the hydrophilic silicate surface to an organophilic one [21,22]. The presence of organic cations increases the number of decomposition steps.…”

Section: Structure Analysismentioning

confidence: 99%

Thermal properties of nanocomposites based on polyethylene and n-heptaquinolinum modified montmorillonite

Olewnik

Garman

Piechota

et al. 2012

J Therm Anal Calorim

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The aim of the research was obtaining and application of smectic clay modifying agent. The organophilic clay is used as nanofiller in polymer nanocomposites [1]. A microwave-assisted reaction led to obtaining N-heptaquinolinum, which is amphiphilic compound, containing both hydrophobic (alkyl and aromatic) and hydrophilic sections in its structure [2]. N-heptaquinolinum was used as a montmorillonite clay modifying agent. Modification was carried out in formulated way [3,4]. Modification efficiency was determined by X-ray diffraction (XRD) analysis and elementary analysis. Organophilic clay (Ch7) was introduced, using the extrusion method, into polyethylene matrix in different mass relations (1.5, 3 and 5 %) [3]. The structure of obtained materials was studied by means of XRD and SEM. To evaluate potential applications thermal properties of received nanocomposites were tested with thermogravimetric analysis and differential scanning calorimetry. The thermal stability of PE/clay composites can be improved in the case of loading 1.5 and 5 mass%.

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“…hydrophobic interaction. Different modifications in the structure of insulin have been made to affect insulin [9][10][11][12][13][14][15][16][17][18][19][20][21]. Insulin has the tendency to undergo for the structural transformation and results in aggregation and formation of insoluble insulin fibrils.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, most popular methods for the stabilization of the insulin against fibrillation contribute to counteract associated insulin from being disassembled [2, [9][10][11][12][13]22]. It is evident that the stabilization mechanism is consistent with the destabilising role attributed to hydrophobic surfaces [14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Impact of Gemini Surfactants on the Stability of Insulin using Computational Tools

Kumar¹,

Singh²,

Chandra³

et al. 2017

J Nanomedine Biotherapeutic Discov

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Modification of montmorillonite surfaces using a novel class of cationic gemini surfactants

Cited by 174 publications

References 22 publications

Organic modification of montmorillonite and effect of catalytic selectivity on the dimerization of unsaturated fatty acid

Organic modification of montmorillonite and effect of catalytic selectivity on the dimerization of unsaturated fatty acid

Thermal properties of nanocomposites based on polyethylene and n-heptaquinolinum modified montmorillonite

Impact of Gemini Surfactants on the Stability of Insulin using Computational Tools

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