Conference Papers

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    Dispersion analysis of nanofillers and its relationship to the properties of the nanocomposites
    (Elsevier Ltd, 2021) George, G.; Dev, A.P.; Asok, N.N.; Anoop, M.S.; Anandhan, S.
    The dispersion and distribution characteristics of the reinforcements are the key reasons that influence the mechanical properties of the nanocomposites. In this paper, the dispersion and distribution analysis of nanofillers in a representative polymer is performed and the results are correlated to the crystalline and mechanical properties of the nanocomposite. The nanocomposite used in the present study is Elvaloy®4924 (EVACO)/halloysite nanotubes (HNTs) composite. The dispersion of halloysite nanotubes in the EVACO matrix is recorded as aluminum elemental maps obtained from energy dispersive spectroscopy (EDS). The dispersion and distribution of fillers in the composite are quantified using an image processing technique and it is correlated to the crystalline and tensile properties of the composites. The better dispersion and distribution of HNTs at 1wt.% filler loading resulted in a remarkable improvement in the crystallinity of the composite, which is measured by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The tensile strength was highest for composites loaded with 1 wt.% filler, and the strength decayed as the loading was further increased. Agglomeration of halloysite nanotubes and polymer-filler debonding was the major reason behind the reduction in tensile strength with filler loading, as observed in the scanning electron micrographs of the fractured surfaces. © 2021 Elsevier Ltd. All rights reserved.
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    Effect of nanofillers on the crystalline and mechanical properties of EVACO polymer nanocomposites
    (Elsevier Ltd, 2021) George, G.; Hareendran, H.; Kumar, T.M.A.; Joshy, S.; Sanju, A.C.; Anandhan, S.
    In this work, the effect of different fillers on the crystalline and mechanical properties of the poly(ethylene-co-vinyl acetate-co-carbon monoxide) (EVACO) terpolymer composite is studied systematically. Alumina trihydrate nanoparticles (nano-ATH), halloysite nanotubes (HNTs), and the multiwalled carbon nanotubes (MWCNTs) are the representative fillers used in the present study. The surface of MWCNTs are decorated using carbonyl, however, nano-ATH and HNTs are used without any surface treatment. The mechanical properties of the composites are evaluated using a tensile test and the improvement in the mechanical properties can be correlated to the improvement in the crystallinity in the composite. The presence of nanofillers in the EVACO matrix significantly influenced the crystallinity, which was determined by X-ray diffraction. The fractography studies reveal the presence of agglomerates at high filler loading results in the subsequent reduction in the tensile properties. Interestingly, the MWCNTs at very low filler loading significantly enhances the tensile properties of EVACO. © 2021 Elsevier Ltd. All rights reserved.
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    Visible light assisted photocatalytic reduction of chromium (VI) using PANI/TiO2nanocomposite from aqueous solutions
    (American Institute of Physics Inc., 2023) Rathna, T.; JagadeeshBabu, J.P.
    Polyaniline (PANI)/TiO2 composite was prepared by in-situ chemical polymerisation of aniline monomer in the presence of ammonium persulfate (APS) and Degussa P25. The setbacks of TiO2 semiconductor catalysts like low visible light exploitation and aggregation of TiO2 nanoparticles can be avoided by incorporating PANI. The electron acceptability, electrically tuneable properties, optical and photoelectrical properties, chemical and thermal stability makes the conducting PANI a key for property enhancement of catalysts. The characterisation of nanocomposite was done using Attenuated total reflectance - Fourier transform infrared spectroscopy (ATR-FTIR), Brunauer-Emmett-Teller (BET), Transmission electron spectroscopy (TEM) and Thermal gravimetric (TGA) analysis. This synergic effect of PANI-TiO2 was exploited for the removal of Cr(VI) from the wastewater in this work. PANI is rich in positively charged amino groups that can potentially adsorb Cr(VI) anions and convert to less toxic Cr(III) on the catalyst's surface. Suspended PANI/TiO2 reveals the excellent conversion (99.90%) of Cr(VI) in acidic pH under visible light irradiation. The emeraldine salt form of PANI is more reactive to Cr(VI) and the conversion to emeraldine base form is the endpoint of the reduction reaction. © 2023 Author(s).