Nayan Ranjan Singha | West Bengal University Of Technology (original) (raw)

Papers by Nayan Ranjan Singha

Chemical Engineering and Processing: Process Intensification, 2011

Polyvinyl alcohol (PVOH) has been chemically modified by crosslink copolymerization of acrylic ac... more Polyvinyl alcohol (PVOH) has been chemically modified by crosslink copolymerization of acrylic acid (AA) and acrylamide (AM) in aqueous solution of PVOH and finally crosslinking the copolymer with methylene bis acrylamide (MBA) and PVOH with glutaraldehyde to produce a full interpenetrating network (FIPN) membrane. Accordingly, three such fully crosslinked IPNs i.e. FIPN25, FIPN50 and FIPN75 have been synthesized with different

Journal of materials chemistry. A, Materials for energy and sustainability, 2018

Unorthodox synthesis of natural polymer-g-terpolymer superadsorbent for exclusion of M(ii/iii).

Polymer Chemistry, 2017

GG-g-(AA-co-AM-co-APA) IPN superadsorbent, characterization of loaded microstructures and individ... more GG-g-(AA-co-AM-co-APA) IPN superadsorbent, characterization of loaded microstructures and individual/synergistic adsorption mechanism of MB/SF/Pb(ii)/Cd(ii)/Cu(ii) are reported.

ACS omega, Apr 12, 2018

Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide... more Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide) interpenetrating polymer networks (PANIPNs) were synthesized through systematic multistage optimization of equilibrium swelling ratio by response surface methodology for individual and/or synergistic removal(s) of cationic safranine (SF), anionic methyl orange, and M(II/III), such as Hg(II), Cd(II), and Cr(III). The relative effects of copolymer compositions on ligand-selective adsorption, strong/weak H-bonds, thermal stabilities, crystallinity, surface properties, swelling abilities, cross-link densities, network parameters, hydrophilic−hydrophobic characteristics, and adsorption capacities (ACs) were measured through extensive microstructural analyses of adsorbed and/or unadsorbed PANIPN41 and PANIPN21 bearing sodium acrylate and N-isopropylacrylamide (SA/NIPAm) in 4:1 and 2:1 ratios, respectively, using Fourier transform infrared, 1 H and 13 C NMR, X-ray photoelectron spectroscopy, thermogravimetric analysis, differential scanning calorimetry, Xray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy, along with measuring lower critical solution temperature, % gel content (% GC), % −COOH, and pH PZC. Extensive UV−vis measurements were carried out at varying copolymer compositions, initial pH (pH i), and dyes, interpreted considering monomer−dimer and azonium−ammonium equilibrium of dye, dye−dye complexation, ligand-selective PANIPNs−dye adduct formation, π−π stacking interactions, and orientation effect of dyes. Thermodynamically feasible chemisorption processes showed the maximum ACs of 127.61, 96.78, 103.36, and 99.41 mg g −1 for SF, Hg(II), Cd(II), and Cr(III), respectively, under optimum conditions.

Sustainable Energy Technologies and Assessments, Jun 1, 2023

ACS Applied Polymer Materials

Macromolecular Rapid Communications

Here, redox active aliphatic luminescent polymers (ALPs) are synthesized via polymerization of N,... more Here, redox active aliphatic luminescent polymers (ALPs) are synthesized via polymerization of N,N‐dimethyl‐2‐propenamide (DMPA) and 2‐methyl‐2‐propenoic acid (MPA). The structures and properties of the optimum ALP3, ALP3‐aggregate and Cu(I)‐ALP3, ratiometric pH sensing, redox activity, aggregation enhanced emission (AEE), Stokes shift, and oxygen‐donor selective coordination‐reduction of Cu(II) to Cu(I) are explored via spectroscopic, microscopic, density functional theory‐reduced density gradient (DFT‐RDG), fluorescence quenching, adsorption isotherm‐thermodynamics, and electrochemical methods. The intense blue and green fluorescence of ALP3 emerges at pH = 7.0 and 9.0, respectively, due to alteration of fluorophores from –C(═O)N(CH3)2/ –C(═O)OH to –C(O−)═N+(CH3)2/ –C(═O)O−, inferred from binding energies at 401.32 eV (–C(O−)═N+(CH3)2) and 533.08 eV (–C(═O)O–), significant red shifting in absorption and emission spectra, and peak at 2154 cm−1. The n−π* communications in ALP3‐aggre...

ACS Applied Bio Materials

ACS Omega, 2018

Grafting of guar gum (GG) and in situ strategic attachment of acrylamidosodiumpropanoate (ASP) vi... more Grafting of guar gum (GG) and in situ strategic attachment of acrylamidosodiumpropanoate (ASP) via solution polymerization of acrylamide (AM) and sodium acrylate (SA) resulted in the synthesis of a sustainable GG-g-(AM-co-SA-co-ASP)/GGAMSAASP interpenetrating polymer network (IPN)-based smart superadsorbent with excellent physicochemical properties and reusability, through systematic optimization by response surface methodology (RSM) for removal of methyl violet (MV) and/or Hg(II). The relative effects of SA/AM ratios, in situ allocation of ASP, grafting of GG into the AMSAASP terpolymer, ligand-selective superadsorption mechanism, and relative microstructural changes in individually/synergistically-adsorbed MV−/Hg(II)−/Hg(II)−MV−GGAMSAASPs were determined by extensive analyses using Fourier transform infrared (FTIR), proton nuclear magnetic resonance, ultraviolet−visible (UV−vis), and O 1s-/N 1s-/C 1s-/Hg 4f 7/2,5/2-X-ray photoelectron spectroscopies, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, field emission scanning electron microscopy, and energy-dispersive spectroscopy and were supported by % gel content, pH PZC , and % graft ratio. The ionic/covalent-bonding, monodentate, bidentate bridging, and bidentate chelating coordination between GGAMSAASPs and Hg(II), and MV + −Hg(II) bonding were rationalized by FTIR, UV−vis, fitment of kinetics data to the pseudo-second-order model, and thermodynamic parameters. The maximum adsorption capacities of 49.12 and 53.28 mg g −1 were determined for Hg(II) and MV, respectively, under optimized conditions.

International Journal of Biological Macromolecules

Membranes, 2019

For the fulfilment of increasing global demand and associated challenges related to the supply of... more For the fulfilment of increasing global demand and associated challenges related to the supply of clean-and-safe water, PV has been considered as one of the most attractive and promising areas in desalinating salty-water of varied salinities. In pervaporative desalination, the sustainability, endurance, and structural features of membrane, along with operating parameters, play the dominant roles and impart paramount impact in governing the overall PV efficiency. Indeed, polymeric- and organic-membranes suffer from several drawbacks, including inferior structural stability and durability, whereas the fabrication of purely inorganic membranes is complicated and costly. Therefore, recent development on the high-performance and cost-friendly PV membrane is mostly concentrated on synthesizing composite- and NCP-membranes possessing the advantages of both organic- and inorganic-membranes. This review reflects the insights into the physicochemical properties and fabrication approaches of d...

Separation and Purification Technology, 2011

... Paramita Das a , SK Ray Corresponding Author Contact Information , a , E-mail The Correspondi... more ... Paramita Das a , SK Ray Corresponding Author Contact Information , a , E-mail The Corresponding Author , SB Kuila a , HS Samanta a and NR Singha a. a Department of Polymer Science and Technology, University of Calcutta, India. ...

Lightweight Polymer Composite Structures, 2020

Coordination Chemistry Reviews, 2021

Abstract Among the multifunctional smart lightweight materials, there is an uprising demand of me... more Abstract Among the multifunctional smart lightweight materials, there is an uprising demand of metal organic framework (MOF) based aerogels because of their hierarchically porous tunable structures constituting various combinations of structural motifs tailor made for diverse applications including removals of heavy metals, dyes, and organic contaminants; CO2 capture and reduction; photodegradation and removal of pollutants; oil-water separation; absorber of electromagnetic radiation; real time monitoring sensor; capacitor; electrode materials of battery; airborne water supply; and air clean up. Indeed, compared to pure MOFs or pure aerogels, the enhanced structural diversity, stability, textural properties, and application prospects of MOF aerogels and metal organic aerogels are contributed by hierarchically porous tunable structures dependent on the methods of synthesis and drying. Nowadays, researchers are continuously engaged in developing the newer strategies to exploit the performance potential and application prospects of these tailor made heterogeneous materials both in the biomedical and non-biomedical sectors. Accordingly, in the present review, recent developments, unique set of structures, characterizations, properties, diverse applications, and structure-property-performance interrelationships of these high-performance state-of-the-art heterogeneous materials have been chronologically discussed and presented starting from its discovery in 2009.

Separation Science and Technology, 2009

Polyvinyl alcohol(PVOH) has been chemically modified by crosslinking copolymerization of acrylic ... more Polyvinyl alcohol(PVOH) has been chemically modified by crosslinking copolymerization of acrylic acid(AA) and hydroxyethylmethacrylate (HEMA) in aqueous solution of PVOH and finally crosslinking PVOH with glutaraldehyde to produce a full interpenetrating network(IPN) membrane. Accordingly, three such full crosslink IPNs i.e., PVAHI, PVAHII and PVAHIII have been synthesized with different weight ratio of PVOH:Poly (AA-co-HEMA) i.e., 1:0.25 (PVAHI), 1:0.50 (PVAHII) and 1:0.75 (PVAHIII). These IPN membranes have been used for pervaporative separation of MTBE-methanol mixtures. All the PVAH membranes were also characterized with various conventional methods like FTIR, mechanical properties, DSC and TGA. Permeability and methanol selectivity of these membranes were found to increase with increasing amount of copolymer in PVOH matrix. However, among the three membranes, PVAHIII were found to show the highest flux but lower selectivity for methanol while PVAHII membrane showed optimum performance in terms of both flux and selectivity.

Biodegradable Polymers, Blends and Composites, 2022

Biodegradable Polymers, Blends and Composites

ACS Applied Bio Materials

Intrinsically fluorescent biocompatible multifunctional multipurpose terpolymers, i.e., methyl me... more Intrinsically fluorescent biocompatible multifunctional multipurpose terpolymers, i.e., methyl methacrylate-co-methyl 3-(N-isopropylacrylamido)-2-methylpropanoate-co-N-isopropylacrylamide (MMA-co-M...

ACS Omega

Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide... more Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide) interpenetrating polymer networks (PANIPNs) were synthesized through systematic multistage optimization of equilibrium swelling ratio by response surface methodology for individual and/or synergistic removal(s) of cationic safranine (SF), anionic methyl orange, and M(II/III), such as Hg(II), Cd(II), and Cr(III). The relative effects of copolymer compositions on ligand-selective adsorption, strong/weak H-bonds, thermal stabilities, crystallinity, surface properties, swelling abilities, cross-link densities, network parameters, hydrophilic−hydrophobic characteristics, and adsorption capacities (ACs) were measured through extensive microstructural analyses of adsorbed and/or unadsorbed PANIPN41 and PANIPN21 bearing sodium acrylate and N-isopropylacrylamide (SA/NIPAm) in 4:1 and 2:1 ratios, respectively, using Fourier transform infrared, 1 H and 13 C NMR, X-ray photoelectron spectroscopy, thermogravimetric analysis, differential scanning calorimetry, Xray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy, along with measuring lower critical solution temperature, % gel content (% GC), % −COOH, and pH PZC. Extensive UV−vis measurements were carried out at varying copolymer compositions, initial pH (pH i), and dyes, interpreted considering monomer−dimer and azonium−ammonium equilibrium of dye, dye−dye complexation, ligand-selective PANIPNs−dye adduct formation, π−π stacking interactions, and orientation effect of dyes. Thermodynamically feasible chemisorption processes showed the maximum ACs of 127.61, 96.78, 103.36, and 99.41 mg g −1 for SF, Hg(II), Cd(II), and Cr(III), respectively, under optimum conditions.

Chemical Engineering and Processing: Process Intensification, 2011

Polyvinyl alcohol (PVOH) has been chemically modified by crosslink copolymerization of acrylic ac... more Polyvinyl alcohol (PVOH) has been chemically modified by crosslink copolymerization of acrylic acid (AA) and acrylamide (AM) in aqueous solution of PVOH and finally crosslinking the copolymer with methylene bis acrylamide (MBA) and PVOH with glutaraldehyde to produce a full interpenetrating network (FIPN) membrane. Accordingly, three such fully crosslinked IPNs i.e. FIPN25, FIPN50 and FIPN75 have been synthesized with different

Journal of materials chemistry. A, Materials for energy and sustainability, 2018

Unorthodox synthesis of natural polymer-g-terpolymer superadsorbent for exclusion of M(ii/iii).

Polymer Chemistry, 2017

GG-g-(AA-co-AM-co-APA) IPN superadsorbent, characterization of loaded microstructures and individ... more GG-g-(AA-co-AM-co-APA) IPN superadsorbent, characterization of loaded microstructures and individual/synergistic adsorption mechanism of MB/SF/Pb(ii)/Cd(ii)/Cu(ii) are reported.

ACS omega, Apr 12, 2018

Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide... more Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide) interpenetrating polymer networks (PANIPNs) were synthesized through systematic multistage optimization of equilibrium swelling ratio by response surface methodology for individual and/or synergistic removal(s) of cationic safranine (SF), anionic methyl orange, and M(II/III), such as Hg(II), Cd(II), and Cr(III). The relative effects of copolymer compositions on ligand-selective adsorption, strong/weak H-bonds, thermal stabilities, crystallinity, surface properties, swelling abilities, cross-link densities, network parameters, hydrophilic−hydrophobic characteristics, and adsorption capacities (ACs) were measured through extensive microstructural analyses of adsorbed and/or unadsorbed PANIPN41 and PANIPN21 bearing sodium acrylate and N-isopropylacrylamide (SA/NIPAm) in 4:1 and 2:1 ratios, respectively, using Fourier transform infrared, 1 H and 13 C NMR, X-ray photoelectron spectroscopy, thermogravimetric analysis, differential scanning calorimetry, Xray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy, along with measuring lower critical solution temperature, % gel content (% GC), % −COOH, and pH PZC. Extensive UV−vis measurements were carried out at varying copolymer compositions, initial pH (pH i), and dyes, interpreted considering monomer−dimer and azonium−ammonium equilibrium of dye, dye−dye complexation, ligand-selective PANIPNs−dye adduct formation, π−π stacking interactions, and orientation effect of dyes. Thermodynamically feasible chemisorption processes showed the maximum ACs of 127.61, 96.78, 103.36, and 99.41 mg g −1 for SF, Hg(II), Cd(II), and Cr(III), respectively, under optimum conditions.

Sustainable Energy Technologies and Assessments, Jun 1, 2023

ACS Applied Polymer Materials

Macromolecular Rapid Communications

Here, redox active aliphatic luminescent polymers (ALPs) are synthesized via polymerization of N,... more Here, redox active aliphatic luminescent polymers (ALPs) are synthesized via polymerization of N,N‐dimethyl‐2‐propenamide (DMPA) and 2‐methyl‐2‐propenoic acid (MPA). The structures and properties of the optimum ALP3, ALP3‐aggregate and Cu(I)‐ALP3, ratiometric pH sensing, redox activity, aggregation enhanced emission (AEE), Stokes shift, and oxygen‐donor selective coordination‐reduction of Cu(II) to Cu(I) are explored via spectroscopic, microscopic, density functional theory‐reduced density gradient (DFT‐RDG), fluorescence quenching, adsorption isotherm‐thermodynamics, and electrochemical methods. The intense blue and green fluorescence of ALP3 emerges at pH = 7.0 and 9.0, respectively, due to alteration of fluorophores from –C(═O)N(CH3)2/ –C(═O)OH to –C(O−)═N+(CH3)2/ –C(═O)O−, inferred from binding energies at 401.32 eV (–C(O−)═N+(CH3)2) and 533.08 eV (–C(═O)O–), significant red shifting in absorption and emission spectra, and peak at 2154 cm−1. The n−π* communications in ALP3‐aggre...

ACS Applied Bio Materials

ACS Omega, 2018

Grafting of guar gum (GG) and in situ strategic attachment of acrylamidosodiumpropanoate (ASP) vi... more Grafting of guar gum (GG) and in situ strategic attachment of acrylamidosodiumpropanoate (ASP) via solution polymerization of acrylamide (AM) and sodium acrylate (SA) resulted in the synthesis of a sustainable GG-g-(AM-co-SA-co-ASP)/GGAMSAASP interpenetrating polymer network (IPN)-based smart superadsorbent with excellent physicochemical properties and reusability, through systematic optimization by response surface methodology (RSM) for removal of methyl violet (MV) and/or Hg(II). The relative effects of SA/AM ratios, in situ allocation of ASP, grafting of GG into the AMSAASP terpolymer, ligand-selective superadsorption mechanism, and relative microstructural changes in individually/synergistically-adsorbed MV−/Hg(II)−/Hg(II)−MV−GGAMSAASPs were determined by extensive analyses using Fourier transform infrared (FTIR), proton nuclear magnetic resonance, ultraviolet−visible (UV−vis), and O 1s-/N 1s-/C 1s-/Hg 4f 7/2,5/2-X-ray photoelectron spectroscopies, thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction, field emission scanning electron microscopy, and energy-dispersive spectroscopy and were supported by % gel content, pH PZC , and % graft ratio. The ionic/covalent-bonding, monodentate, bidentate bridging, and bidentate chelating coordination between GGAMSAASPs and Hg(II), and MV + −Hg(II) bonding were rationalized by FTIR, UV−vis, fitment of kinetics data to the pseudo-second-order model, and thermodynamic parameters. The maximum adsorption capacities of 49.12 and 53.28 mg g −1 were determined for Hg(II) and MV, respectively, under optimized conditions.

International Journal of Biological Macromolecules

Membranes, 2019

For the fulfilment of increasing global demand and associated challenges related to the supply of... more For the fulfilment of increasing global demand and associated challenges related to the supply of clean-and-safe water, PV has been considered as one of the most attractive and promising areas in desalinating salty-water of varied salinities. In pervaporative desalination, the sustainability, endurance, and structural features of membrane, along with operating parameters, play the dominant roles and impart paramount impact in governing the overall PV efficiency. Indeed, polymeric- and organic-membranes suffer from several drawbacks, including inferior structural stability and durability, whereas the fabrication of purely inorganic membranes is complicated and costly. Therefore, recent development on the high-performance and cost-friendly PV membrane is mostly concentrated on synthesizing composite- and NCP-membranes possessing the advantages of both organic- and inorganic-membranes. This review reflects the insights into the physicochemical properties and fabrication approaches of d...

Separation and Purification Technology, 2011

... Paramita Das a , SK Ray Corresponding Author Contact Information , a , E-mail The Correspondi... more ... Paramita Das a , SK Ray Corresponding Author Contact Information , a , E-mail The Corresponding Author , SB Kuila a , HS Samanta a and NR Singha a. a Department of Polymer Science and Technology, University of Calcutta, India. ...

Lightweight Polymer Composite Structures, 2020

Coordination Chemistry Reviews, 2021

Abstract Among the multifunctional smart lightweight materials, there is an uprising demand of me... more Abstract Among the multifunctional smart lightweight materials, there is an uprising demand of metal organic framework (MOF) based aerogels because of their hierarchically porous tunable structures constituting various combinations of structural motifs tailor made for diverse applications including removals of heavy metals, dyes, and organic contaminants; CO2 capture and reduction; photodegradation and removal of pollutants; oil-water separation; absorber of electromagnetic radiation; real time monitoring sensor; capacitor; electrode materials of battery; airborne water supply; and air clean up. Indeed, compared to pure MOFs or pure aerogels, the enhanced structural diversity, stability, textural properties, and application prospects of MOF aerogels and metal organic aerogels are contributed by hierarchically porous tunable structures dependent on the methods of synthesis and drying. Nowadays, researchers are continuously engaged in developing the newer strategies to exploit the performance potential and application prospects of these tailor made heterogeneous materials both in the biomedical and non-biomedical sectors. Accordingly, in the present review, recent developments, unique set of structures, characterizations, properties, diverse applications, and structure-property-performance interrelationships of these high-performance state-of-the-art heterogeneous materials have been chronologically discussed and presented starting from its discovery in 2009.

Separation Science and Technology, 2009

Polyvinyl alcohol(PVOH) has been chemically modified by crosslinking copolymerization of acrylic ... more Polyvinyl alcohol(PVOH) has been chemically modified by crosslinking copolymerization of acrylic acid(AA) and hydroxyethylmethacrylate (HEMA) in aqueous solution of PVOH and finally crosslinking PVOH with glutaraldehyde to produce a full interpenetrating network(IPN) membrane. Accordingly, three such full crosslink IPNs i.e., PVAHI, PVAHII and PVAHIII have been synthesized with different weight ratio of PVOH:Poly (AA-co-HEMA) i.e., 1:0.25 (PVAHI), 1:0.50 (PVAHII) and 1:0.75 (PVAHIII). These IPN membranes have been used for pervaporative separation of MTBE-methanol mixtures. All the PVAH membranes were also characterized with various conventional methods like FTIR, mechanical properties, DSC and TGA. Permeability and methanol selectivity of these membranes were found to increase with increasing amount of copolymer in PVOH matrix. However, among the three membranes, PVAHIII were found to show the highest flux but lower selectivity for methanol while PVAHII membrane showed optimum performance in terms of both flux and selectivity.

Biodegradable Polymers, Blends and Composites, 2022

Biodegradable Polymers, Blends and Composites

ACS Applied Bio Materials

Intrinsically fluorescent biocompatible multifunctional multipurpose terpolymers, i.e., methyl me... more Intrinsically fluorescent biocompatible multifunctional multipurpose terpolymers, i.e., methyl methacrylate-co-methyl 3-(N-isopropylacrylamido)-2-methylpropanoate-co-N-isopropylacrylamide (MMA-co-M...

ACS Omega

Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide... more Pectin-g-(sodium acrylate-co-3-(N-isopropylacrylamido) sodium propanoate-coN -isopropylacrylamide) interpenetrating polymer networks (PANIPNs) were synthesized through systematic multistage optimization of equilibrium swelling ratio by response surface methodology for individual and/or synergistic removal(s) of cationic safranine (SF), anionic methyl orange, and M(II/III), such as Hg(II), Cd(II), and Cr(III). The relative effects of copolymer compositions on ligand-selective adsorption, strong/weak H-bonds, thermal stabilities, crystallinity, surface properties, swelling abilities, cross-link densities, network parameters, hydrophilic−hydrophobic characteristics, and adsorption capacities (ACs) were measured through extensive microstructural analyses of adsorbed and/or unadsorbed PANIPN41 and PANIPN21 bearing sodium acrylate and N-isopropylacrylamide (SA/NIPAm) in 4:1 and 2:1 ratios, respectively, using Fourier transform infrared, 1 H and 13 C NMR, X-ray photoelectron spectroscopy, thermogravimetric analysis, differential scanning calorimetry, Xray diffraction, scanning electron microscopy, and energy dispersive X-ray spectroscopy, along with measuring lower critical solution temperature, % gel content (% GC), % −COOH, and pH PZC. Extensive UV−vis measurements were carried out at varying copolymer compositions, initial pH (pH i), and dyes, interpreted considering monomer−dimer and azonium−ammonium equilibrium of dye, dye−dye complexation, ligand-selective PANIPNs−dye adduct formation, π−π stacking interactions, and orientation effect of dyes. Thermodynamically feasible chemisorption processes showed the maximum ACs of 127.61, 96.78, 103.36, and 99.41 mg g −1 for SF, Hg(II), Cd(II), and Cr(III), respectively, under optimum conditions.