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Sol-gel network silica/modified montmorillonite clay hybrid nanocomposites for hydrophobic surface coatings.
Colloids Surf B Biointerfaces. 2012 Feb 01; 90:204-10.CS

Abstract

Sol-gel silica/nanoclay composites were prepared through sol-gel polymerization technique using tetraethylorthosilicate precursor and montmorillonite (MMT) clay in aqueous media. In this study, both montmorillonite-K(+) and organically modified MMT (OMMT) clays were used. The prepared composites were coated on glass substrate by making 1 wt% solution in ethyltrichlorosilane. The incorporation of nanoclay does not alter the intensity of characteristic Si-O-Si peak of silica network. Thermogravimetric studies show that increasing clay content increased the degradation temperature of the composites. Differential scanning calorimetry (DSC) results of organically modified MMT nanoclay incorporated composite show a shift in the melting behavior up to 38°C. From DSC thermograms, we observed that the ΔH value decreased with increasing clay loading. X-ray diffraction patterns prove the presence of nanoclay in the composite and increase in the concentration of organically modified nanoclay from 3 to 5 wt% increases the intensity of the peak at 2θ=8° corresponds to OMMT. Morphology of the control silica gel composite was greatly influenced by the incorporation of OMMT. The presence of nanoclay changed the surface of control silica gel composite into cleaved surface with brittle in nature. Contact angle measurements were done for the coatings to study their surface behavior. These hybrid coatings on glass substrate may have applications for hydrophobic coatings on leather substrate.

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Authors+Show Affiliations

Meera KM
Council of Scientific and Industrial Research (CSIR)-Central Leather Research Institute (CLRI), Polymer Division, Adyar, Chennai, India.
Sankar RM
No affiliation info available
Murali A
No affiliation info available
Jaisankar SN
No affiliation info available
Mandal AB
No affiliation info available

MeSH

Aluminum SilicatesBentoniteCalorimetry, Differential ScanningClayGlassHydrophobic and Hydrophilic InteractionsMaterials TestingNanocompositesNanotechnologyParticle SizePhase TransitionPolymerizationSilanesSilica GelSurface PropertiesTemperatureThermogravimetryX-Ray Diffraction

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22056084

Citation

Meera, Kamal Mohamed Seeni, et al. "Sol-gel Network Silica/modified Montmorillonite Clay Hybrid Nanocomposites for Hydrophobic Surface Coatings." Colloids and Surfaces. B, Biointerfaces, vol. 90, 2012, pp. 204-10.
Meera KM, Sankar RM, Murali A, et al. Sol-gel network silica/modified montmorillonite clay hybrid nanocomposites for hydrophobic surface coatings. Colloids Surf B Biointerfaces. 2012;90:204-10.
Meera, K. M., Sankar, R. M., Murali, A., Jaisankar, S. N., & Mandal, A. B. (2012). Sol-gel network silica/modified montmorillonite clay hybrid nanocomposites for hydrophobic surface coatings. Colloids and Surfaces. B, Biointerfaces, 90, 204-10. https://doi.org/10.1016/j.colsurfb.2011.10.018
Meera KM, et al. Sol-gel Network Silica/modified Montmorillonite Clay Hybrid Nanocomposites for Hydrophobic Surface Coatings. Colloids Surf B Biointerfaces. 2012 Feb 1;90:204-10. PubMed PMID: 22056084.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sol-gel network silica/modified montmorillonite clay hybrid nanocomposites for hydrophobic surface coatings. AU - Meera,Kamal Mohamed Seeni, AU - Sankar,Rajavelu Murali, AU - Murali,Adhigan, AU - Jaisankar,Sellamuthu N, AU - Mandal,Asit Baran, Y1 - 2011/10/18/ PY - 2011/05/17/received PY - 2011/10/08/revised PY - 2011/10/12/accepted PY - 2011/11/8/entrez PY - 2011/11/8/pubmed PY - 2012/3/15/medline SP - 204 EP - 10 JF - Colloids and surfaces. B, Biointerfaces JO - Colloids Surf B Biointerfaces VL - 90 N2 - Sol-gel silica/nanoclay composites were prepared through sol-gel polymerization technique using tetraethylorthosilicate precursor and montmorillonite (MMT) clay in aqueous media. In this study, both montmorillonite-K(+) and organically modified MMT (OMMT) clays were used. The prepared composites were coated on glass substrate by making 1 wt% solution in ethyltrichlorosilane. The incorporation of nanoclay does not alter the intensity of characteristic Si-O-Si peak of silica network. Thermogravimetric studies show that increasing clay content increased the degradation temperature of the composites. Differential scanning calorimetry (DSC) results of organically modified MMT nanoclay incorporated composite show a shift in the melting behavior up to 38°C. From DSC thermograms, we observed that the ΔH value decreased with increasing clay loading. X-ray diffraction patterns prove the presence of nanoclay in the composite and increase in the concentration of organically modified nanoclay from 3 to 5 wt% increases the intensity of the peak at 2θ=8° corresponds to OMMT. Morphology of the control silica gel composite was greatly influenced by the incorporation of OMMT. The presence of nanoclay changed the surface of control silica gel composite into cleaved surface with brittle in nature. Contact angle measurements were done for the coatings to study their surface behavior. These hybrid coatings on glass substrate may have applications for hydrophobic coatings on leather substrate. SN - 1873-4367 UR - https://www.unboundmedicine.com/medline/citation/22056084/Sol_gel_network_silica/modified_montmorillonite_clay_hybrid_nanocomposites_for_hydrophobic_surface_coatings_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0927-7765(11)00602-3 DB - PRIME DP - Unbound Medicine ER -