Synthesis, characterization and assessment thermal properties of clay based nanopigments

doi:10.1007/s11705-015-1505-7

Front. Chem. Sci. Eng.

2015, Vol. 9

Issue (1) : 40-45 https://doi.org/10.1007/s11705-015-1505-7

RESEARCH ARTICLE

Synthesis, characterization and assessment thermal properties of clay based nanopigments

Mohammad Banimahd KIEVANI^1,^*(

),Milad EDRAKI²

1. Department of Chemistry, Payame Noor University, Tehran, Iran
2. Young Research and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran

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Abstract

Nano-clay based pigments (NCP) are new type of pigments composed of organic dyes and layered silicate-clay nano-particles, and have already been used in polymeric coatings to improve mechanical thermal and stability properties. In this paper, the basic blue 41(BB41) was intercalated into Na⁺- montmorillonite in an aqueous medium. The dye-intercalated montmorillonite was centrifuged, dried, and milled to prepare the nanopigment particles. X-ray diffraction showed an increase in the basal spacing, thus confirming intercalation of the BB41 molecules within the nanostructures of the interlayer spaces. Fourier transform infrared spectroscopy was used for identifying the functional groups and chemical bounding of Na⁺-montmorillonite, BB41 and montmorillonite-BB41. The morphology of NCP was also studied by transmission electron microscopy. Finally, thermo-gravimetric analysis and differential thermograms suggested the thermal stability of the intercalated dye was improved.

Keywords nanopigment layered silicate cationic dye thermal properties

Corresponding Author(s): Mohammad Banimahd KIEVANI

Issue Date: 07 April 2015

Cite this article:

Milad EDRAKI,Mohammad Banimahd KIEVANI. Synthesis, characterization and assessment thermal properties of clay based nanopigments[J]. Front. Chem. Sci. Eng., 2015, 9(1): 40-45.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-015-1505-7
https://academic.hep.com.cn/fcse/EN/Y2015/V9/I1/40

Fig.1 The structure of montmorillonite

Fig.2 Representation of clay sheet, dye molecule (methylene blue) and blue nanopigment

Fig.3 Molecular structure of basic blue 41

Tab.1 Characteristics of maxilon blue used as cathionic dye

Tab.2 Characteristics of Na⁺-montmorilonite

Fig.4 Schematic view of nanopigment synthesis at laboratory

Fig.5 XRD patterns of Na⁺-MMT clay and BB41- MMT

Tab.3 Interlayer distances of Na⁺-MMT and BB41/MMT systems obtained by XRD

Fig.6 TEM micrograph of the BB41-MMT

Fig.7 TGA curves for (a) Na⁺-MMT, (b) BB41 and (c) BB41-MMT samples, measured at a heating rate of 10 °C·min^–1 under N₂ gas

Fig.8 DTG curves for (a) Na⁺-MMT, (b) BB41 and (c) BB41-MMT samples, measured at a heating rate of 10 °C·min^–1 under N₂ gas

Fig.9 FTIR spectra of (a) Na⁺-MMT, (b) MMT—BB41 and (c) BB41

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