Faculty Publications
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Publications by NITK Faculty
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Item A Review on Health Care Applications of Biopolymers(wiley, 2022) Vijesh, A.M.; Isloor, A.M.Significant changes in the modern medical field in recent decades are due to the commercialization of new diagnostic tools, surgical devices, and implantable devices. Biocompatible materials played a pivotal role in the success of such medical instruments. The biocompatibility of the material used in health care plays a crucial role in deciding their medical applications. It mainly depends on the chemical composition of the materials used and also with their physical and chemical properties. Interactions between the tissue and the biomaterials also play a major role in the selection of materials for the biomedical applications. Development of cost-effective biomaterials showing fewer side effects is the biggest challenge for the researchers. One can tune and modify the properties of biomaterials based on their applications with great effort. These biocompatible materials are either naturally occurring one or synthetic, which includes biodegradable polymers, metals, alloys, ceramics, and composites. This review chapter discusses few of the recent developments in the biomaterial research mainly used in medical applications. © 2022 Scrivener Publishing LLC.Item Review on polymeric membrane materials for gas separations which are stated above the Robeson’s trade-off upper bound(Elsevier, 2023) Vijesh, A.M.; Isloor, A.M.Membrane separation of gases is highly energy efficient and are widely accepted compared to other conventional gas separation methods. Membrane gas separation plays a vital role in the protection of our environment and ensures sustainable growth of industries. The compromise between permeability and selectivity as explained by the Robeson’s upper bound minimized the number of commercial gas separation membranes. It unveiled the tailoring of new materials in the design of superior membranes. This review chapter explores the recent developments of membrane materials for various gas/vapor separation applications. © 2024 Elsevier Inc. All rights reserved.Item Review on inorganic ion exchange membranes for diverse applications(Elsevier, 2023) Vijesh, A.M.; Isloor, A.M.; Kumar, V.Ion exchange membranes (IEMs) are extensively employed in many separation processes, especially in water treatment and fuel cells. Separation using IEMs makes the process more environment friendly, greener, and energy efficient. It is also useful in recovering some components of the effluents otherwise that are being left as waste and significantly contributes to the sustainable growth of the society. Inorganic IEMs are superior to the organic IEMs in various aspects. This review chapter addresses the recent developments in the inorganic IEMs in consideration with their preparation and potential applications. © 2024 Elsevier Inc. All rights reserved.Item Membrane technology—a promising approach for metal ion extraction(Elsevier, 2024) Antony, N.; Vijesh, A.M.; Isloor, A.M.Metal ion extraction using ion exchange membranes (IEM) receives much attention as it can find a solution to environmental problems to reduce emissions of heavy metals from wastewater contaminated with industrial effluents. Among the various IEM available, cation exchange membranes are widely used by researchers due to its enhanced ability to hold the metal ion and retain them in the organic phase. This review book chapter emphasizes the extraction of metal ions, specifically about the studies carried out in the field of iron, zinc, and copper metal ions using IEM. © 2024 Elsevier Inc. All rights reserved.Item Advances of membrane technology in wastewater treatment(Elsevier, 2024) Deepthi, P.V.; Viji, K.; Vijesh, A.M.; Isloor, A.M.; Kumar, V.Pure water scarcity is becoming a real threat to the modern world. Rapid growth in the textile, paper, and printing industries has caused the production of large quantities of dye effluents, and they must be treated before passing to the water bodies or lands to minimize pollution and environmental impacts. Polymeric membrane-based filtration has been established as an optimal and greener approach for removing hazardous dyes from polluted water. Superior thermal, chemical, and mechanical properties and convenient modifiability made polysulfone (PSF), polyethersulfone (PES), and polyphenylsulfone (PPSU) ideal for the production of membranes for the treatment of dye effluents from industries. This chapter emphasizes the recent developments in modified PSF, PES, and PPSU membranes and their dye rejection properties. © 2025 Elsevier Inc. All rights reserved.Item Pilot scale studies for membranes in biohydrogen technologies(Elsevier, 2025) Antony, N.; Vijesh, A.M.; Isloor, A.M.Hydrogen (H2) is a cost-effective and green energy source that can be considered a substitute for conventional fossil fuels. Hydrogen-based fuel cells, supercapacitors, and batteries are used as energy storage devices in many commercial applications to make them a cleaner and more environmentally friendly process. Hydrogen produced from nonrenewable energy sources, such as oil, natural gas, and coal, is not cost-effective and involves processes that pollute our environment. Thus, developing economically viable and environmentally friendly processes is necessary to satisfy the massive demand for H2 as a green energy source. This chapter provides a comprehensive review of pilot-scale studies conducted in the field of membrane-based biohydrogen technology. © 2026 Elsevier Inc. All rights reserved.Item Fabrication of PPSU/PANI hollow fiber membranes for humic acid removal(Elsevier Ltd, 2020) Vijesh, A.M.; Arathi Krishnan, P.V.; Isloor, A.M.; Shyma, P.C.Membrane based separation has proved its efficiency over other traditional techniques of water purification. Hollow fiber (HF) membranes are more ideal compared to other types of membranes due to their high surface area, enhanced mechanical property and easy handling. Significant research had been done in this area, still the abundant scope of membrane technology has motivated many scientists to further explore the field. The current work is an attempt to study the efficiency of nanomaterials in polymeric membranes. This paper is focused on incorporating polyaniline (PANI) based nanocomposites into the polymer membranes and to study the properties and performance of the prepared nanocomposite membranes. Polyphenylsulfone (PPSU) and polyvinylpyrrolidone (PVP) are the main polymer and pore forming agent used in this study respectively. The dope solution was prepared by blending PPSU and PVP with PANI in different compositions. New PPSU composite HF membranes were fabricated using wet-jet phase inversion technique. The properties and performance of the membranes were analyzed by cross sectional morphology, water uptake capacity, permeation properties and antifouling ability. The self-cleaning capacity of the membranes was determined by evaluating the flux recovery ratio. The water purification efficiency of the membranes was evaluated in terms of humic acid rejection studies. Polyphenylsulfone containing 0.5 wt% of polyaniline exhibited maximum rejection of 99% for humic acid. © 2020 Elsevier Ltd. All rights reserved.Item 5-Diethyl-amino-2-[(E)-(4-methyl-3-nitro-phenyl)-imino-meth-yl]phenol: A redetermination(2009) Fun, H.-K.; Kia, R.; Vijesh, A.M.; Isloor, A.M.The title compound, C18H21N3O3, is a potential bidentate Schiff base ligand. The whole mol-ecule is disordered with a refined site-occupancy ratio of 0.567 (4):0.433 (4) and not just one ethyl group as reported previously [Sarojini et al. (2007). Acta Cryst. E63, o4782-o4782]. Using the whole mol-ecule disorder, R values are much smaller than those published. An intra-molecular O - H?N hydrogen bond generates a six-membered ring, producing an S(6) ring motif. The dihedral angle between the mean plane of the two benzene rings (major component) is 9.0 (5)°. The crystal structure shows short C?C [3.189 (15)-3.298 (12) Å] and C?O [2.983 (5)-3.149 (13) Å] contacts. Inter-molecular C - H?O inter-actions link neighbouring mol-ecules into dimers with R 2 2(18) motifs. In the crystal structure, these dimers are linked together by inter-molecular C - H?O inter-actions into one-dimensional extended chains along the b axis. The crystal structure is further stabilized by inter-molecular ?-? stacking inter-actions [centroid-centroid distances = 3.458 (8)-3.691 (6) Å].Item (Z)-1-(2,5-Dichloro-3-thien-yl)ethanone semicarbazone(2009) Fun, H.-K.; Ching Kheng, C.K.; Vijesh, A.M.; Hegde, C.; Isloor, A.M.The title mol-ecule, C7H7Cl2N 3OS, is approximately planar [maximum deviation = 0.062 (1) Å]. Short inter-molecular distances between the centroids of the five-membered rings [3.5340 (8) Å] indicate the existence of ?-? inter-actions. An inter-esting feature of the crystal structure is the presence of short intra-molecular Cl?N inter-actions [3.0015 (11) Å]. Mol-ecules are linked via pairs of inter-molecular N - H?O hydrogen bonds, generating R 2 2(8) ring motifs. Furthermore, N - H?O hydrogen bonds form R 2 1(7) ring motifs with C - H?O contacts, further consolidating the crystal structure. In the crystal, mol-ecules are linked by these inter-molecular inter-actions, forming chains along [001]. © 2009 Fun et al.Item 4-Amino-3-(p-tolyl-oxymeth-yl)-1H-1,2,4-triazole-5(4H)-thione(2009) Fun, H.-K.; Goh, J.H.; Vijesh, A.M.; Padaki, M.; Isloor, A.M.In the title triazole compound, C10H12N 4OS, the triazole ring is essentially planar [maximum deviation = 0.009 (1) Å] and forms a dihedral angle of 5.78 (4)° with the benzene ring. In the crystal structure, mol-ecules are linked into dimers by centrosymmetric N - H?S inter-actions. These dimers are linked into two-mol-ecule-wide tapes by N - H?N and S?S [3.2634 (3) Å] inter-actions. In addition, they are further inter-connected by weak N - H?S inter-actions into sheets parallel to the ab plane. The crystal structure is further stabilized by weak inter-molecular C - H?? inter-actions. © 2009 Fun et al.