Faculty Publications
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Publications by NITK Faculty
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Item A facile synthesis of halloysite nanotubes based polymer nanocomposites for glass coating application(Elsevier Ltd, 2018) Buruga, K.; Kalathi, J.T.Halloysite-based polymethyl methacrylate (HNT-PMMA) and polystyrene (HNT-PS) nanocomposite coatings for glasses were synthesized by ultrasound-assisted solution blending method. The coatings were then dip-coated on four different types of soda-lime glass and the spectral, mechanical properties of the coated glasses were analyzed. The coated glass samples displayed a better scratch resistance and surface hydrophobicity, compared to uncoated samples, without any significant changes in their inherent spectral properties. The thermal and mechanical properties (Tg and tensile strength) of the nanocomposites were also enhanced compared to neat polymers. The improvement in thermal and scratch resistance of the coatings is ascribed to the inclusion of halloysite nanotubes (HNTs) in the polymer matrix. Hence, HNT-based PMMA/PS nanocomposite coatings can be effectively used for glasses in automotive and architectural applications. © 2017 Elsevier B.V.Item Polystyrene-halloysite nano tube membranes for water purification(Korean Society of Industrial Engineering Chemistry A-803 Twin Bldg 275-3 Yangjae-Dong Seocho-Kul Seoul 137-130, 2018) Buruga, K.; Kalathi, J.T.; Kim, K.-H.; Ok, Y.S.; Boukhvalov, B.Membrane technologies are a sustainable solution for treatment of water and wastewater. Here, the technical feasibility of polystyrene-halloysite nanotube (PS-HNT) membranes, fabricated by an ultrasound-assisted solution casting method, was explored for water purification. To this end, the effects of various solvents on the structure, morphology, thermal, and mechanical properties of PS-HNT membranes were investigated. Introduction of HNTs (5 wt%) into the polystyrene matrix demonstrated excellent thermal and mechanical properties along with good water flux, rejection of unwanted components, recovery, and regeneration cycles. These membranes were overall useful enough to purify real wastewater collected from pulp and paper mill. © 2017 The Korean Society of Industrial and Engineering ChemistryItem Performance of halloysite nanotube/poly(styrene-co-methylmethacrylate) nanocomposite coatings for the protection of soda-lime glass(Elsevier Ltd, 2019) Buruga, K.; Kalathi, J.T.Polymer-based coatings for the protection of glass surfaces are used considerably in the construction and automotive industries. This research article focuses on the potential use of halloysite nanotubes (HNT)/Poly(Styrene-co-Methylmethacrylate) (PS-co-PMMA) nanocomposites as coatings for the protection of soda-lime glass. The effect of HNT content and coating thickness on the spectral properties of the glass, morphology, surface-wettability, and thermo-mechanical properties of the nanocomposite coatings were investigated and reported. The inherent spectral behavior of glass was not altered significantly by the coatings when the content of HNTs in coatings was ? 5 wt %. The coated glasses also exhibited a slight increase in the solar skin protection factor (SSPF), but notable improvement in the solar material protection factor (SMPF) when the HNT content was high in coatings. Thermogravimetric analysis (TGA) revealed that the HNT/PS-co-PMMA nanocomposite coatings possess excellent thermal stability compared to the neat copolymer. The surface wettability of coated glasses by water droplets decreased substantially due to coatings as evident from contact angle measurements. The HNT/PS-co-PMMA nanocomposites also displayed enhanced tensile strength and scratch resistance with increasing HNT content of coatings up to 5 wt%. Overall, the performance of the coated glass was enhanced by the coatings. © 2018 Elsevier B.V.Item Synthesis of poly(styrene-co-methyl methacrylate) nanospheres by ultrasound-mediated Pickering nanoemulsion polymerization(Springer Netherlands rbk@louisiana.edu, 2019) Buruga, K.; Kalathi, J.T.Poly (styrene-co-methyl methacrylate) (PS-co-PMMA) nanospheres were synthesized by ultrasound-mediated Pickering nanoemulsion polymerization using halloysite nanotubes (HNTs) as a stabilizer. A relatively high conversion (? 99%) was obtained in a short span of time (60 min) relative to (?97%) for that obtained by conventional emulsion polymerization performed without ultrasound. The initial rate of polymerization and the conversion were found to be increasing with the acoustic intensity in the range of 12.5–25 W/cm2). The synthesized copolymer nanosphere particles exhibited a perfect spherical shape (from TEM analysis), good stability (from zeta-potential analysis), high molecular weight (Mw? 311 kDa from Gel permeation chromatography), and excellent thermal properties (Tg? 120°C from DSC and TGA) as a result of the combined physicochemical effects of acoustic cavitation. The formation of nanosized emulsion droplets stabilized by HNTs ultimately yielded nanospheres of PS-co-PMMA with an average size of ? 82.8 nm. The PS-co-PMMA nanospheres can have potential applications in medicine, dentistry, paper, paint, and automotive industries. © 2019, The Polymer Society, Taipei.