Chemistry, Physical and Theoretical Chemistry, Analytical Chemistry, Spectroscopy
5
Scopus Publications
197
Scholar Citations
5
Scholar h-index
4
Scholar i10-index
Scopus Publications
Self-Assembly in Aqueous Oppositely Charged Gemini Surfactants: A Correlation between Morphology and Solubilization Efficacy Sneha Singh, Arti Bhadoria, Kushan Parikh, Sanjay Kumar Yadav, Sugam Kumar, V. K. Aswal, Sanjeev Kumar Journal of Physical Chemistry B, 2017 Micellization behavior of oppositely charged gemini surfactants (anionic surfactant; phosphoric acid, P,P'-1,4-butanedieyl, P,P'-didodecylester, disodium salt (12-4-12A), and cationic surfactant; butanediyl-1,4, bis (N,N-hexadecyl ammonium) dibromide (16-4-16) or (D-isosorbate-1,4-diyl bis(N,N-dimethyl-N-hexadecylammonium acetoxy) dichloride (16-Isb-16)) has been studied (individually or of a gemini mixture) by conductivity and surface tension measurements. Critical micelle concentration (CMC) data show both synergistic (for 12-4-12A + 16-Isb-16) and antagonistic (for 12-4-12A + 16-4-16) interactions between the two components. Small angle neutron scattering (SANS) measurement shows formation of various aggregates, spherical (or ellipsoidal), rod-shaped, and vesicular, by changing the mole fraction (at fixed total surfactant concentration, 10 mM). Viscosity, zeta (ζ)-potential, and transmission electron microscopy (TEM) data are found in conformity of SANS results. Surprisingly, two morphologies (vesicles and rod-shaped micelles) show stability in a wide temperature range (303-343 K). The behavior has been explained on the basis of temperature induced dehydration and depletion of micellar charge. Aqueous gemini mixtures, of different morphologies, have been used for the determination of solubilization efficacy (using UV-visible spectrophotometer) toward polycyclic aromatic hydrocarbons (PAHs: anthracene; pyrene or fluorene). Molar solubilization ratio (MSR) data suggest that vesicles enhance the solubilization efficacy. SANS analysis shows that vesicle bilayer thickness increases upon PAH solubilization. The order of bilayer thickness increase is found to be anthracene > pyrene > fluorene, which is in the same order as the aqueous solubility of PAHs. This is the first report which correlates morphology to the solubilization efficacy.
Mechanistic approach on heat induced growth of anionic surfactants: A clouding phenomenon Arti Bhadoria, Sugam Kumar, Vinod K. Aswal, Sanjeev Kumar Rsc Advances, 2015 Clouding behaviour of aqueous anionic surfactants have been studied. Data reveal that the onset of attractive interaction on heating is responsible for micellar growth and the unusual clouding.
Morphologies near cloud point in aqueous ionic surfactant: Scattering and NMR studies Sanjeev Kumar, Arti Bhadoria, Harsha Patel, Vinod K. Aswal Journal of Physical Chemistry B, 2012 Clouding phenomenon in ionic surfactant solution is fairly a new addition to the conventional phenomenon observed with nonionic counterpart. Various scattering and spectroscopic techniques, dynamic light scattering (DLS), small angle neutron scattering (SANS), and nuclear magnetic resonance (NMR), have been used to draw information regarding the aggregate morphologies (formed by an ionic surfactant, tetra-n-butylammonium dodecylsulphate, TBADS) when the surfactant solution passes through the cloud point (CP). DLS measurements have shown that two morphologies are present when the system approaches the CP. The data revealed that individual micelles (~5 nm) convert to giant aggregates (~500 nm) over the range of temperature including the CP. SANS experiments have been performed to draw the information regarding individual micellar fraction below and above the CP. NMR spectra at different temperatures have been collected for TBADS solution. The broadening and the downfield shift of -N-CH(2) and -O-CH(2) proton peaks support the micellar growth as the sample was heated. The above peaks show splitting (into two each) confirming the presence of two morphologies around the CP. It is noted that conversion of only a small fraction of individual micelles is responsible for the clouding.
Thermodynamic energetics of charged micellar solutions with and without salts at the cloud point Sanjeev Kumar, Arti Bhadoria Journal of Chemical and Engineering Data, 2012 Cloud point (CP) data have been acquired for two anionic surfactants, namely, tetra-n-butyl ammonium dodecylsulfate (TBADS) and tetra-n-butylammonium dodecylbenzenesulfonate (TBADBS) with and without salts (Ca(NO3)2 and Al(NO3)3). The energetics of clouding process, standard Gibbs free energy change (ΔG°c), standard enthalpy change (ΔH°c), and standard entropy (ΔS°c) were evaluated. The release of solvated water from the clouding component causes the phase separation. Hence CP was taken as the limit of its solubility. The ΔG°c for all of the systems with and without inorganic salts is found to be negative. However, both ΔH°c and ΔS°c are positive and negative depending upon concentration and charge on the counterion. The results are discussed in the light of exchange of counterions (TBA+ by Ca2+ or Al3+) and formation of bridges through displaced TBA+ among the anionic micelles present in the solution.
Chemistry and Economics of Biodegradable Materials: Sustainable Alternatives for the Future S Mohapatra, A Bhadouria Recent Advances in Transportation Systems, 761-777 , 2026 2026
Modelling and Integration of Sustainable Materials and Biopolymers for Enhanced Energy Efficiency and Environmental Performance S Mohapatra, A Bhadouria Recent Advances in Transportation Systems, 737-760 , 2026 2026
Self-assembly in aqueous oppositely charged gemini surfactants: a correlation between morphology and solubilization efficacy S Singh, A Bhadoria, K Parikh, SK Yadav, S Kumar, VK Aswal, S Kumar The Journal of Physical Chemistry B 121 (37), 8756-8766 , 2017 2017 Citations: 28
Mechanistic approach on heat induced growth of anionic surfactants: a clouding phenomenon A Bhadoria, S Kumar, VK Aswal, S Kumar RSC advances 5 (30), 23778-23786 , 2015 2015 Citations: 9
Morphologies near cloud point in aqueous ionic surfactant: scattering and NMR studies S Kumar, A Bhadoria, H Patel, VK Aswal The Journal of Physical Chemistry B 116 (12), 3699-3703 , 2012 2012 Citations: 18
Thermodynamic energetics of charged micellar solutions with and without salts at the cloud point S Kumar, A Bhadoria Journal of Chemical & Engineering Data 57 (2), 521-525 , 2012 2012 Citations: 12
Morphology and antibacterial activity of carbohydrate-stabilized silver nanoparticles ST Mayur Valodkar , Arti Bhadoria , Jayshree Carbohydrate Research 345, 1767–1773 , 2010 2010 Citations: 130
MOST CITED SCHOLAR PUBLICATIONS
Morphology and antibacterial activity of carbohydrate-stabilized silver nanoparticles ST Mayur Valodkar , Arti Bhadoria , Jayshree Carbohydrate Research 345, 1767–1773 , 2010 2010 Citations: 130
Self-assembly in aqueous oppositely charged gemini surfactants: a correlation between morphology and solubilization efficacy S Singh, A Bhadoria, K Parikh, SK Yadav, S Kumar, VK Aswal, S Kumar The Journal of Physical Chemistry B 121 (37), 8756-8766 , 2017 2017 Citations: 28
Morphologies near cloud point in aqueous ionic surfactant: scattering and NMR studies S Kumar, A Bhadoria, H Patel, VK Aswal The Journal of Physical Chemistry B 116 (12), 3699-3703 , 2012 2012 Citations: 18
Thermodynamic energetics of charged micellar solutions with and without salts at the cloud point S Kumar, A Bhadoria Journal of Chemical & Engineering Data 57 (2), 521-525 , 2012 2012 Citations: 12
Mechanistic approach on heat induced growth of anionic surfactants: a clouding phenomenon A Bhadoria, S Kumar, VK Aswal, S Kumar RSC advances 5 (30), 23778-23786 , 2015 2015 Citations: 9
Chemistry and Economics of Biodegradable Materials: Sustainable Alternatives for the Future S Mohapatra, A Bhadouria Recent Advances in Transportation Systems, 761-777 , 2026 2026
Modelling and Integration of Sustainable Materials and Biopolymers for Enhanced Energy Efficiency and Environmental Performance S Mohapatra, A Bhadouria Recent Advances in Transportation Systems, 737-760 , 2026 2026
