Preparation and characterization of montmorillonite–silica nanocomposites: A sol–gel approach to modifying clay surfaces

Qian, Zhongzhong; Hu, Guangjun; Zhang, Shimin; Yang, Mingshu

doi:10.1016/j.physb.2008.04.008

Cited by 48 publications

(30 citation statements)

References 36 publications

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“…Several characterization techniques were employed in order to identify the changes in clay: fourier transforminfra-red (FT-IR), X-ray diffraction (XRD), raman spectroscopy, Si/Al NMR, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and nitrogen adsorption-desorption isotherms [14]. FT-IR is a complementary method to X-ray diffraction (XRD) and other methods used to investigate clays and clay minerals.…”

Section: Introductionmentioning

confidence: 99%

FT-IR Spectroscopy Applied for Surface Clays Characterization

Djomgoue¹,

Njopwouo²

2013

JSEMAT

115

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The present paper should be considered as a review of the application of Fourier Transform Infra-Red for surface clay characterization. The application of surface clay materials for water treatment, oil adsorption, excipients or as active in drugs has largely increased these recent years. The surface clay material presents hydroxyl groups, which can link very easily water molecules. These hydroxyl groups can react with organic groups and by their vibration in the infra-red region, FT-IR can be easily used as a technical method for surface clay characterization. In this paper, we focus on the determination of Lewis and Brönsted acid sites on the clay surface, a critical review of the sample preparation, the surface characterization of bulk clay and the modified surface clay samples using FT-IR spectroscopy.

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Section: Introductionmentioning

confidence: 99%

FT-IR Spectroscopy Applied for Surface Clays Characterization

Djomgoue¹,

Njopwouo²

2013

JSEMAT

115

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“…The most widely used method is the treatment of the clays with quaternary ammonium salts, which allows the substitution of some metal ions present in the structures of the clay by quaternary ammonium ions with large organic groups. Another modification procedure includes the grafting of silanes [10,11]. Clay minerals have reactive hydroxyl groups that can react with silanol (Si-OH) groups of the hydrolyzed silane to form siloxane (Si-O-Si) bonds.…”

Section: Introductionmentioning

confidence: 99%

“…Clay minerals have reactive hydroxyl groups that can react with silanol (Si-OH) groups of the hydrolyzed silane to form siloxane (Si-O-Si) bonds. A discussion on the location of the reactive -OH groups in the clay crystals, mainly in the edges and the structural defects of the crystals, can be found in the literature [9][10][11][12][13][14]. When the silanization occurs in the interlayer of the clay, the distance between the layers increases, thus favoring the compounding of the nanocomposites [13].…”

Section: Introductionmentioning

confidence: 99%

Study of the effects of the reaction conditions on the modification of clays with polyelectrolytes and silanes

Orden

Muñoz

Lorenzo

et al. 2010

Journal of Colloid and Interface Science

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“…This may be because TEOS molecules are smaller than those of KH550 and become more accessible to attached to the kaolinite surface more easily. Some of the hydroxyl groups in the hydrolyzed TEOS could react with hydroxyl groups located present on the kaolinite surface, and others could interact with hydroxyl groups in the silane coupling agent, and form a large network (Qian, Hu, Zhang, & Yang, 2008). The bands at 3694.8 and 3621.4 cm −1 are ascribed to the outer hydroxyl groups and inner hydroxyl groups, respectively, of kaolinite.…”

Section: Resultsmentioning

confidence: 99%