http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/35 Mon, 20 Apr 2026 13:49:54 GMT 2026-04-20T13:49:54Z http://http://starc.stthomas.ac.in:8080/xmlui:8080/xmlui/bitstream/id/90c17403-c57e-4b6b-a923-74a911ae0c82/ http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/35 http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/200 Effect of zeolite on glass fibre reinforced cyanate ester nano composites Francis, P Martin; Jose, T Sunil Cyanate esters are thermally resistant thermosetting resins with low dielectric constant, low moisture absorption, high glass transition temperature and can be tuned for different mechanical, thermal and electrical properties. In this work, different compositions (0%, 1%, 3% and 5%) of zeolite nanoparticles incorporated cyanate ester composites were synthesised by Hand Lay-Up method followed by compression moulding. Curing was done at 200°C for half an hour. Mechanical properties like tensile strength, flexural modulus were measured using Universal Testing Machine. The thermal properties of the composites were studied by Thermogravimetric analysis (TGA). The decomposition occurred between 350°C to 400°C. The dielectric studies were carried out using LCR meter. All these studies supports that the chosen composite is a potential candidate for dielectric applications. Tue, 29 Oct 2019 00:00:00 GMT http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/200 2019-10-29T00:00:00Z http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/150 Chitosan stabilized Fe/Ni bimetallic nanoparticles for the removal of cationic and anionic triphenylmethane dyes from water P, Anju Rose Puthukkara; T, Sunil Jose; S, Dinooplal A comparative investigation has been carried out for the effective removal of cationic and anionic triphenylmethane dyes from the water using zero valent iron and iron/nickel bimetallic nanoparticles stabilized by chitosan (CS). The biopolymer chitosan, used as a stabilizer in this study is biodegradable and non-toxic. Chitosan stabilized zero valent iron (CS-Fe) and Chitosan stabilized bimetallic iron/nickel (CS-Fe/Ni) nanoparticles were prepared by chemical reduction method using sodium borohydride as reducing agent under nitrogen atmosphere. The characteristics of CS-Fe/Ni, CS-Fe and CS nanoparticles were examined by HRTEM, XPS, Zeta Potential, zeta potential and FTIR. HRTEM results reveal that iron nanoparticles were successfully coated with chitosan and the prepared particles were in nano dimensions. The average size of these synthesized nanoparticles was below 15 nm. The interaction of hydroxyl and amino groups of chitosan with iron in CS-Fe/Ni and CS-Fe nanoparticles was confirmed by FTIR. The surface compositions of the nanoparticles obtained from the XPS analysis revealed the presence of zerovalent iron and nickel in chitosan. Batch experiments were carried out to evaluate the removal efficiencies of CS-Fe/Ni, CS-Fe and CS in the triphenylmethane dyes. The model pollutants selected for dye removal study were cationic malachite green dye and anionic methyl blue dye. The parameters studied in the dye removal were effects of dosage of the nanoparticle, contact time, initial concentration of the dyes, solution pH and ionic strength. The results indicate that CS-Fe/Ni nanoparticles are more effective in dye removal compared to CS-Fe nanoparticles and CS. Tue, 01 Dec 2020 00:00:00 GMT http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/150 2020-12-01T00:00:00Z http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/128 Comparative studies of silane coupled e-glass fiber and e-glass fiber reinforced bismaleimide-epoxy hydroxylated BaTiO3 nanocomposites on the dielectric and mechanical properties K, Savitha Unnikrishnan; T, Sunil Jose; S, Dinoop Lal Silane coupled E-glass fiber (SC-EGF) and E-glass fiber (EGF) reinforced bismaleimide (BMI)-epoxy-hydroxylated BaTiO3 (BTOH) nanocomposites with 1–5 wt% of BTOH nanofiller were fabricated by hand lay-up method and compression molded. Surface hydroxylation of synthesized BaTiO3 nanoparticles was carried out using H2O2. Both BT and BTOH nanoparticles were characterized by SEM, XRD, and FTIR studies. Among the reinforced nanocomposites, SC-EGF-reinforced showed a remarkable increase in mechanical and dielectric properties. The tensile strength of BMI-epoxy composite increased 1.56 and 3.10 times when loaded with 2 and 3 wt% of BTOH, respectively. Their flexural strength too increased 2.14 and 2.21 times upon 2 and 3 wt% of BTOH loading. BMI-epoxy-BTOH nanocomposites with 3 wt% of BTOH showed higher tensile strength, flexural strength, and dielectric strength indicating that it possesses better mechanical and insulating properties and composites with 2 wt% showed higher dielectric constant and lower dielectric loss indicating that this composition could be explored to high dielectric applications. Mon, 05 Apr 2021 00:00:00 GMT http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/128 2021-04-05T00:00:00Z http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/114 Plant mediated synthesis of zero valent iron nanoparticles and its application in water treatment P, Anju Rose Puthukkara; T, Sunil Jose; S, Dinoop lal For the last twenty more years, the zero valent iron (ZVI) nanoparticles are being investigated for their application in the water pollution remediation. The search for “green” strategies leads to the advancement in the plant-mediated synthesis of ZVI nanoparticles. In this perspective, this article aims to review the synthesis strategies and stabilization methods for ZVI nanoparticles prepared from plants. The reduction and capping/stabilization of nanoparticles using various plant extracts and their bioactive components have been discussed here. The possibility of some of the plant-based stabilizing materials and their mechanism was also highlighted in this review. A special focus is given to the application of phytogenic ZVI nanoparticles on water pollution remediation (heavy metal removal, nitrate and phosphate removal, pharmaceutical products removal, dye removal, organic compounds removal and antimicrobial activity). Mon, 01 Feb 2021 00:00:00 GMT http://starc.stthomas.ac.in:8080/xmlui/xmlui/handle/123456789/114 2021-02-01T00:00:00Z