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Srivastava J, Nayak SK, Mudali UK. March towards self-reliance in heavy water and specialty materials. CURR SCI INDIA 2022. [DOI: 10.18520/cs/v123/i3/322-329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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2
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Kumar VV, Kumar CR, Suresh A, Jayalakshmi S, Mudali UK, Sivaraman N. Evaluation of polybenzimidazole-based polymers for the removal of uranium, thorium and palladium from aqueous medium. R Soc Open Sci 2018; 5:171701. [PMID: 30110444 PMCID: PMC6030331 DOI: 10.1098/rsos.171701] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 05/11/2018] [Indexed: 06/08/2023]
Abstract
Four types of polybenzimidazole (PBI)-based polymers (m-PBI, p-PBI, pyridine-based m-PBI and alkylated m-PBI) have been prepared and characterized. Extraction behaviour of heavy metal ions, viz. U(VI), Th(IV) and Pd(II), with these polymers was investigated. Distribution ratios for the extraction of these metal ions were measured as a function of nitric acid concentration. Extraction data reveal that, in general, p-PBI exhibits a higher distribution ratio for U(VI), Th(IV) and Pd(II) compared with the other polymeric resins evaluated in the present study. Column chromatography experiments were carried out with a solution of U(VI), Th(IV) and Pd(II) in dilute nitric acid media using columns packed with m- and p-PBI polymeric material for understanding the sorption and elution behaviour. The p-PBI-based resin has shown higher palladium sorption capacity (1.8 mmol g-1). The studies also established that p-PBI resin is a potential candidate material for the recovery of U(VI) and Th(IV) (capacity 0.22 mmol g-1 and 0.13 mmol g-1) from an aqueous stream, e.g. mine water samples.
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Affiliation(s)
- V. Vijaya Kumar
- Organic Chemistry Laboratory, Department of Chemistry, Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology, Avadi, Chennai 600 062, Tamil Nadu, India
| | - C. Ramesh Kumar
- Organic Chemistry Laboratory, Department of Chemistry, Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology, Avadi, Chennai 600 062, Tamil Nadu, India
| | - A. Suresh
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603102, India
| | - S. Jayalakshmi
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603102, India
| | - U. Kamachi Mudali
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603102, India
| | - N. Sivaraman
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603102, India
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3
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Vishnu Anand P, Rajeev R, Velavendan P, Pandey N, Kamachi Mudali U. Modeling and simulation of diluent recovery unit in PUREX solvent regeneration system. Progress in Nuclear Energy 2018. [DOI: 10.1016/j.pnucene.2017.01.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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4
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Vardhan PV, Sridhar S, Sivakkumar SR, Mudali UK, Devaraj S. Facile Synthesis of Mesoporous MnCO₃ for Supercapacitor Applications. J Nanosci Nanotechnol 2018; 18:2775-2780. [PMID: 29442956 DOI: 10.1166/jnn.2018.14322] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report a rapid and facile synthesis of MnCO3 with uniform mesopores for supercapacitor applications. Mesoporous MnCO3 was synthesised by a co-precipitation method using MnSO4 and (NH4)HCO3 as manganese and carbonate source, respectively. Powder X-ray diffraction study confirmed the formation of rhodochrosite phase of MnCO3. X-ray photoelectron spectroscopic study ascertained the oxidation state of Mn as 2+ in MnCO3. Scanning and Transmission electron microscopic studies revealed that nanograins of size less than 10 nm agglomerated into submicron sized spherical particles of MnCO3. N2 sorption studies displayed a typical type-IV isotherm with H2 hysteresis, demonstrating mesoporosity of as-prepared MnCO3. Furthermore, the mesoporous MnCO3 particles were evaluated for their capacitance properties by cyclic voltammetry and galvanostatic charge-discharge cycling in aqueous 0.1 M Mg(ClO4)2 electrolyte. The fabricated mesoporous MnCO3 electrodes delivered a specific capacitance of 144 F g-1 at a current density of 0.34 A g-1. It also exhibited good rate capability, high reversibility and cyclic stability over 1000 cycles.
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Affiliation(s)
- P Vishnu Vardhan
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, India
| | - S Sridhar
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, India
| | - S R Sivakkumar
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, India
| | - U Kamachi Mudali
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam 603102, India
| | - S Devaraj
- Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur 613401, India
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5
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Mishra S, Soda AK, Sridhar M, Mallika C, Pandey NK, Mudali UK. Identification of diluent degradation products in radiolyzed PUREX solvent. Solvent Extraction and Ion Exchange 2018. [DOI: 10.1080/07366299.2017.1417776] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Satyabrata Mishra
- Reprocessing R&D Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - Anil Kumar Soda
- Fluoroorganics Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
| | - Madabhushi Sridhar
- Fluoroorganics Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
| | - C Mallika
- Reprocessing R&D Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - N. K Pandey
- Reprocessing R&D Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - U. Kamachi Mudali
- Reprocessing R&D Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
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Ravi J, Mishra S, Pandey NK, Mallika C, Kamachi Mudali U. Feasibility studies of using N,N-dihexyloctanamide (DHOA) for fast reactor fuel reprocessing applications. RADIOCHIM ACTA 2017. [DOI: 10.1515/ract-2015-2548] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
N,N-dihexyloctanamide (DHOA) is being considered as a promising extractant in the aqueous reprocessing of spent nuclear fuels. In view of rise in temperature of the solvent during reprocessing of fast reactor fuel, the present study aimed at evaluating the physical properties such as density, viscosity, and interfacial tension and Pu(IV) extraction behavior in 1.1 M DHOA/n-dodecane as a function of temperature and duration of heating. The influence of nitric acid in altering the physical properties with respect to temperature was evaluated. Physical properties and extraction behavior of the solvent changed to a remarkable extent with temperature. Quantitative amount of Pu(IV) could be back-extracted from loaded, solvent in three contacts at 313 K. FT-IR studies were carried out to evaluate the thermal stability of the solvent. Thus, the performance of the solvent, 1.1 M DHOA/n-dodecane is satisfactory at higher temperatures also.
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Affiliation(s)
- Jammu Ravi
- Reprocessing Research and Development Division , Indira Gandhi Centre for Atomic Research , Kalpakkam 603 102 , India
| | - Satyabrata Mishra
- Reprocessing Research and Development Division , Indira Gandhi Centre for Atomic Research , Kalpakkam 603 102 , India
| | - N. K. Pandey
- Reprocessing Research and Development Division , Indira Gandhi Centre for Atomic Research , Kalpakkam 603 102 , India , Fax: +914427480126
| | - C. Mallika
- Reprocessing Research and Development Division , Indira Gandhi Centre for Atomic Research , Kalpakkam 603 102 , India
| | - U. Kamachi Mudali
- Reprocessing Research and Development Division , Indira Gandhi Centre for Atomic Research , Kalpakkam 603 102 , India
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7
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Affiliation(s)
| | | | - C. Mallika
- Corrosion Science and Technology Division
| | - U. Kamachi Mudali
- Materials Chemistry and Metallic Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
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8
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Shukla PK, Hemanth Rao E, Vetrivendan E, Anne RS, Das SK, Malarvizhi B, Ponraju D, Nashine B, Kamachi Mudali U, Selvaraj P. Evaluation of plasma sprayed sacrificial thermal barrier coatings for core catcher of future Sodium cooled Fast Reactors. ANN NUCL ENERGY 2017. [DOI: 10.1016/j.anucene.2017.04.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Ganesh S, Desigan N, Pandey N, Mallika C, Kamachi Mudali U. Extraction studies of gadolinium relevant to its use as neutron poison in the PUREX process. Progress in Nuclear Energy 2017. [DOI: 10.1016/j.pnucene.2017.03.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Affiliation(s)
- U. Kamachi Mudali
- Indira Gandhi Centre for Atomic Research, Metallurgy Division Kalpakkam, 603 102, India
| | - R. K. Dayal
- Indira Gandhi Centre for Atomic Research, Metallurgy Division Kalpakkam, 603 102, India
| | - J. B. Gnanamoorthy
- Indira Gandhi Centre for Atomic Research, Metallurgy Division Kalpakkam, 603 102, India
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11
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Jayaraj J, Thyagarajan K, Mallika C, Mudali UK. Corrosion Behavior of Zirconium, Titanium, and Their Alloys in Simulated Dissolver Solution of Fast Breeder Reactor Spent Nuclear Fuel Using Zircaloy-4 Mock-Up Dissolver Vessel. NUCL TECHNOL 2017. [DOI: 10.13182/nt14-90] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J. Jayaraj
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group Kalpakkam 603102, India
| | - K. Thyagarajan
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group Kalpakkam 603102, India
| | - C. Mallika
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group Kalpakkam 603102, India
| | - U. Kamachi Mudali
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group Kalpakkam 603102, India
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12
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Affiliation(s)
- U. Kamachi Mudali
- Indira Gandhi Centre for Atomic Research, Reprocessing Group and Corrosion Science and Technology Group, Kalpakkam – 603 102, India
| | - A. Ravi Shankar
- Indira Gandhi Centre for Atomic Research, Reprocessing Group and Corrosion Science and Technology Group, Kalpakkam – 603 102, India
| | - R. Natarajan
- Indira Gandhi Centre for Atomic Research, Reprocessing Group and Corrosion Science and Technology Group, Kalpakkam – 603 102, India
| | | | - Baldev Raj
- Indira Gandhi Centre for Atomic Research, Reprocessing Group and Corrosion Science and Technology Group, Kalpakkam – 603 102, India
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13
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Ramesh C, Murugesan N, Ganesan V, Bharasi NS, Pujar MG, Mudali UK. Studies on Dissolution Behavior of the Surface Layer of Sodium-Exposed SS 316LN in Decontaminating Formulation Using PEMHS. NUCL TECHNOL 2017. [DOI: 10.13182/nt15-141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- C. Ramesh
- Indira Gandhi Centre for Atomic Research, Chemistry Group, Kalpakkam 603102, Tamilnadu, India
| | - N. Murugesan
- Indira Gandhi Centre for Atomic Research, Chemistry Group, Kalpakkam 603102, Tamilnadu, India
| | - V. Ganesan
- Indira Gandhi Centre for Atomic Research, Chemistry Group, Kalpakkam 603102, Tamilnadu, India
| | - N. Sivai Bharasi
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group, Kalpakkam 603102, Tamilnadu, India
| | - M. G. Pujar
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group, Kalpakkam 603102, Tamilnadu, India
| | - U. Kamachi Mudali
- Indira Gandhi Centre for Atomic Research, Corrosion Science and Technology Group, Kalpakkam 603102, Tamilnadu, India
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14
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Kumar S, Kumar B, Sinha PK, Sampath M, Sivakumar D, Mudali UK. Extraction of uranium from simulated highly active feed in a micromixer-settler with 30% TBP and 36% TiAP solvents. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-5134-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Affiliation(s)
- M. Sivakumar
- Department of Analytical Chemistry; University of Madras
| | - U. Kamachi Mudali
- Metallurgy Division; Indira Gandhi Centre for Atomic Research; India
| | - S. Rajeswari
- Metallurgy Division; Indira Gandhi Centre for Atomic Research; India
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16
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Dash D, Mallika C, Kamachi Mudali U. Temperature and Concentration Dependence of Viscosity of Binary Mixtures of PEG-1000 + water. Chemical Product and Process Modeling 2016. [DOI: 10.1515/cppm-2016-0037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Viscosities of binary mixtures of polyethylene glycol-1000 (PEG-1000) and water were measured precisely in the temperature range 293.15–343.15 K at atmospheric pressure using a high precision viscometer. Viscosity data were used to calculate the activation energy of viscous flow. The activation energy was observed to increase with increase in the concentration of aqueous solutions of PEG which indicated that more energy is required to move the molecule inside the structure with increase in concentration. The measured data provided better understanding to explain the behaviour of macromolecules with respect to change in concentration and temperature. The results were discussed in the light of polymer-solvent interactions. At lower concentration range, the molecules exhibit weak interaction due to dominant repulsive force and at higher concentration the entanglement of polymer chain increases. In view of greater force of interaction between solute and solvent molecules forming hydrogen bonding, there will be an increase in interaction with temperature and concentration.
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Affiliation(s)
- Debasmita Dash
- Materials, Process and Equipment Development Group, Reprocessing Group , Indira Gandhi Centre for Atomic Research , Kalpakkam - 603102 , India
| | - C. Mallika
- Materials, Process and Equipment Development Group, Reprocessing Group , Indira Gandhi Centre for Atomic Research , Kalpakkam - 603102 , India
| | - U. Kamachi Mudali
- Materials, Process and Equipment Development Group, Reprocessing Group , Indira Gandhi Centre for Atomic Research , Kalpakkam - 603102 , India
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17
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Kumar S, Kumar B, Gelatar JK, Sinha PK, Mishra AK, Kamachi Mudali U. Direct dissolution of g-level U metal and U-6 % Zr alloy bits by TBP-nitric acid adduct and in situ extraction at ambient pressures. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-5025-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Pandey N, Augustine E, Murali R, Desigan N, Kamachi Mudali U, Joshi J. Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon. Chem Eng Res Des 2016. [DOI: 10.1016/j.cherd.2016.05.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Kumari K, Preetha R, Ramachandran D, Vishwakarma V, George RP, Sundaramurthy C, Kamachi Mudali U, Sivathanu Pillai C. Nanoparticles for enhancing mechanical properties of fly ash concrete. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.matpr.2016.04.152] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Ramakrishna Reddy S, Trikha R, Murali R, Augustine E, Desigan N, Pandey NK, Mallika C, Mudali UK, Joshi J. Extraction kinetics of ruthenium in the mixture of tri-n-butyl phosphate and n-dodecane. Progress in Nuclear Energy 2016. [DOI: 10.1016/j.pnucene.2015.10.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Ashok raja C, Balakumar S, Durgalakshmi D, George RP, Anandkumar B, Kamachi Mudali U. Reduced graphene oxide/nano-Bioglass composites: processing and super-anion oxide evaluation. RSC Adv 2016. [DOI: 10.1039/c5ra27160f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
45S5 Bioglass with a mean particle size in the nano regime was synthesized and fabricated with rGO sheets using three different strategies.
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Affiliation(s)
- C. Ashok raja
- National Centre for Nanoscience and Nanotechnology
- University of Madras
- Chennai 600025
- India
| | - S. Balakumar
- National Centre for Nanoscience and Nanotechnology
- University of Madras
- Chennai 600025
- India
| | - D. Durgalakshmi
- National Centre for Nanoscience and Nanotechnology
- University of Madras
- Chennai 600025
- India
| | - R. P. George
- Corrosion Science and Technology Division
- Materials Characterization Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603 102
- India
| | - B. Anandkumar
- Corrosion Science and Technology Division
- Materials Characterization Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603 102
- India
| | - U. Kamachi Mudali
- Corrosion Science and Technology Division
- Materials Characterization Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603 102
- India
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22
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Vishwakarma V, Sudha U, Ramachandran D, Anandkumar B, George R, Kumari K, Preetha R, Kamachi Mudali U, Pillai C. Enhancing antimicrobial properties of fly ash mortars specimens through nanophase modification. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.matpr.2016.04.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Kamaraj K, George RP, Anandkumar B, Parvathavarthini N, Kamachi Mudali U. A silver nanoparticle loaded TiO2 nanoporous layer for visible light induced antimicrobial applications. Bioelectrochemistry 2015. [PMID: 26205428 DOI: 10.1016/j.bioelechem.2015.07.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A nanoporous TiO2 layer was formed on commercially pure titanium by a simple anodization method in aqueous hydrofluoric acid (HF) medium. Silver nanoparticles (AgNP) were loaded into the nanoporous TiO2 layer by UV light irradiation. The morphology, chemical composition and photocatalytic activity of the modified titanium surfaces were characterized by scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and UV-vis absorption spectroscopy techniques. The redox behavior of the AgNP loaded TiO2 layer was analyzed by cyclic voltammetry (CV) studies. The impedance behavior of the nanoporous TiO2 layer with and without AgNP was investigated by electrochemical impedance spectroscopy (EIS). The antibacterial effect of the AgNP loaded TiO2 layer was evaluated using Pseudomonas sp. and Bacillus sp. cultures. The efficacy of this modified layer to act as an antibacterial agent to minimize biofouling of titanium is demonstrated in this investigation.
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Affiliation(s)
- K Kamaraj
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam 603102, India
| | - R P George
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam 603102, India.
| | - B Anandkumar
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam 603102, India
| | - N Parvathavarthini
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam 603102, India
| | - U Kamachi Mudali
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam 603102, India
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24
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Priyadarshini N, Sampath M, Kumar S, Kamachi Mudali U. Light scattering investigation of the hydrolyzed thorium(IV) colloids and polymers. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4274-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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25
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Durgalakshmi D, Balakumar S, Raja CA, George RP, Mudali UK. Structural, Morphological and Antibacterial Investigation of Ag-Impregnated Sol-Gel-Derived 45S5 NanoBioglass Systems. J Nanosci Nanotechnol 2015; 15:4285-4295. [PMID: 26369040 DOI: 10.1166/jnn.2015.9724] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
An increasing percentage of ageing population requires 30-year survivability of orthopedic devices that is not possible with the current bioinert materials, having a maximum of 15-year survivability. To satisfy this growing need, a shift is needed from replacement of tissues to regeneration of tissues. This is highly possible through the use of silica-bioactive glasses. However, a failure of implant can occur due to infections even by using such materials. Advances in using silver for antibacterial applications have been commercialized. However, higher concentrations of silver also lead to toxic effects. In this study, nanoBioglass 45S5 (NBG) and Ag-NBG were synthesized by using sol-gel method followed by solution-phase method, respectively. The bioactive crystals such as Na2Ca2Si3O9, CaCO3, and AgPO3, very much needed in the field of bone tissue engineering and in antibacterial strategies, were obtained in the NBG Matrix. The morphological investigation of NBG with 1 mM Ag+ concentrations shows the nanospikes arrangement of size 30-40 nm with spherical porous structure of size 10-20 nm, which supports the formation of collagen molecular fibrils on the surface of NBG matrices and enhances osseointegration. Both gram-positive and gram-negative strains show higher antibacterial activity for nanoBioglass with 1 mM Ag+ concentration.
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Mishra S, Mallika C, Pandey NK, Kamachi Mudali U, Natarajan R. Effect of Radiolysis in Altering the Physiochemical and Metal Retention Properties of Solvent-Diluent-Acid Systems. SEP SCI TECHNOL 2015. [DOI: 10.1080/01496395.2014.988359] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Balasubramonian S, Srivastav RK, Kumar S, Sivakumar D, Sampath M, Kamachi Mudali U, Natarajan R. Flash point prediction for the binary mixture of phosphatic solvents and n-dodecane from UNIFAC group contribution model. J Loss Prev Process Ind 2015. [DOI: 10.1016/j.jlp.2014.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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28
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Mishra S, Ganesh S, Velavendan P, Pandey NK, Mallika C, Kamachi Mudali U, Natarajan R. Effects of temperature, concentration of acid and metal ions on the solubility of tri-n-butyl phosphate in aqueous phase. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-014-3351-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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29
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Rasmi KR, Vanithakumari SC, George RP, Mallika C, Mudali UK. Nanoparticles of Pt loaded on a vertically aligned TiO2 nanotube bed: synthesis and evaluation of electrocatalytic activity. RSC Adv 2015. [DOI: 10.1039/c5ra16245a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Pt nano particle loaded TiO2 nanotube (TiNT) electrode with excellent electrocatalytic activity was synthesized via seed mediated hydrothermal reduction method on self-aligned TiNT bed.
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Affiliation(s)
- K. R. Rasmi
- Corrosion Science and Technology Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603102
- India
| | - S. C. Vanithakumari
- Corrosion Science and Technology Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603102
- India
| | - R. P. George
- Corrosion Science and Technology Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603102
- India
| | - C. Mallika
- Corrosion Science and Technology Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603102
- India
| | - U. Kamachi Mudali
- Corrosion Science and Technology Group
- Indira Gandhi Centre for Atomic Research
- Kalpakkam 603102
- India
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Suba M, Nageswara Rao A, Velavendan P, Pandey NK, Kamachi Mudali U, Subba Rao RV. Optimization of an analytical method for reducing the volume of radioactive waste generated during determination of uranium in presence of plutonium. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-014-3611-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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31
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Gelatar JK, Kumar B, Sampath M, Kumar S, Kamachi Mudali U, Natarajan R. Dissolution of intact UO2 pellet in batch and rotary dissolver conditions. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3683-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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32
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Ganesh S, Velavendan P, Pandey NK, Kamachi Mudali U, Natarajan R. Estimation of free acidity in some hydrolysable metal ions present in reprocessing streams by fiber optic aided spectrophotometry. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3658-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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Swain P, Annapoorani S, Srinivasan R, Mallika C, Kamachi Mudali U, Natarajan R. Separation and recovery of ruthenium from nitric acid medium by electro-oxidation. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3638-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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34
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Dash D, Kumar S, Mallika C, Kamachi Mudali U. Structural interaction leading to volumetric changes in aqueous solutions of nitrates of rubidium, cesium, strontium, yttrium, and gallium at different temperatures. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-014-3198-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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35
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Nithila SDR, Anandkumar B, Vanithakumari SC, George RP, Mudali UK, Dayal RK. Studies to control biofilm formation by coupling ultrasonication of natural waters and anodization of titanium. Ultrason Sonochem 2014; 21:189-199. [PMID: 23871547 DOI: 10.1016/j.ultsonch.2013.06.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Revised: 06/11/2013] [Accepted: 06/11/2013] [Indexed: 06/02/2023]
Abstract
The main objective of this study was to investigate the combined effect of ultrasonication of natural waters and anodization of titanium on microbial density and biofilm formation tendency on titanium surfaces. Application of 24 kHz, 400 W high power ultrasound through a 14 mm horn type SS (stainless steel) Sonicator with medium amplitude of 60% for 30 min brought about three order decrease in total bacterial density of laboratory tap water, cooling tower water and reservoir water and two order decrease in seawater. Studies on the effect of ultrasonication on dilute pure cultures of Gram-negative and Gram-positive bacteria showed five order and three order decrease for Pseudomonas sp. and Flavobacterium sp. respectively and two order and less than one order decrease for Bacillus sp. and Micrococcus sp. respectively. Ultrasonication increased lag phase and reduced logarithmic population increase and specific growth rate of Gram-negative bacteria whereas for Gram-positive bacteria specific growth rate increased. Studies on the biofilm formation tendency of these ultrasonicated mediums on titanium surface showed one order reduction under all conditions. Detailed biofilm imaging by advanced microscopic techniques like AFM, SEM and epifluorescence microscopy clearly visualized the lysed/damaged cells and membrane perforations due to ultrasonication. Combination of ultrasonication and anodization brought about maximum decrease in bacterial density and biofilm formation with greater than two order decrease in seawater, two order decrease in Bacillus sp. culture and more than four order decrease in Flavobacterium sp. culture establishing the synergistic effect of anodization and ultrasonication in this study.
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Affiliation(s)
- S D Ruth Nithila
- Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
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36
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Indira K, Mudali UK, Rajendran N. In-vitro biocompatibility and corrosion resistance of strontium incorporated TiO2 nanotube arrays for orthopaedic applications. J Biomater Appl 2013; 29:113-29. [PMID: 24346137 DOI: 10.1177/0885328213516821] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
This article investigates the in-vitro biocompatibility and corrosion behaviour of strontium ion incorporated TiO2 nanotube arrays formed by anodization method for orthopaedic applications. The morphological studies were carried out using field emission scanning electron microscopy, atomic force microscopy, attenuated total reflectance fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and thin film X-ray diffraction techniques. The morphological investigation indicated that the length and the average diameter of nanotube were 2.1 ± 0.3 µm and 110 ± 4 nm, respectively. The wettability measurements showed that the TiO2 nanotube arrays have super wettability, as well as, strontium ion incorporated TiO2 nanotube arrays exhibited hydrophilic behaviour. Excellent in-vitro bioactivity was observed for TiO2 nanotube arrays with strontium ions. Electrochemical studies in Hank's solution showed that the TiO2 nanotube arrays with strontium ions have enhanced corrosion resistance.
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Affiliation(s)
- K Indira
- Department of Chemistry, Anna University, Chennai, India
| | - U Kamachi Mudali
- Corrosion Science and Technology Group, Indira Gandhi Center for Atomic Research, Kalpakkam, India
| | - N Rajendran
- Department of Chemistry, Anna University, Chennai, India
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37
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Swain P, Annapoorani S, Srinivasan R, Mallika C, Mudali UK, Natarajan R. Separation of Ruthenium from Simulated Nuclear Waste in Nitric Acid Medium using n-Paraffin Hydrocarbon. SEP SCI TECHNOL 2013. [DOI: 10.1080/01496395.2013.815629] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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38
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Priyadarshini N, Sampath M, Kumar S, Mudali UK, Natarajan R. A combined spectroscopic and light scattering study of hydrolysis of uranium(VI) leading to colloid formation in aqueous solutions. J Radioanal Nucl Chem 2013. [DOI: 10.1007/s10967-013-2624-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Sini K, Mishra S, Mallika C, Pandey NK, Srinivasan R, Kamachi Mudali U, Natarajan R. Kinetics and optimisation of process parameters for electrochemical generation of uranous ions in nitric acid–hydrazine media. J Radioanal Nucl Chem 2013. [DOI: 10.1007/s10967-013-2470-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Ganesh S, Velavendan P, Pandey NK, Kamachi Mudali U, Natarajan R. Direct spectrophotometric determination of ruthenium in aqueous streams of nuclear reprocessing. J Radioanal Nucl Chem 2013. [DOI: 10.1007/s10967-012-2229-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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43
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Abstract
Tri-n-butyl phosphate (TBP) is a universal nuclear extractant, commercially used in the PUREX process for the last 60 years. However, it is prone to nitration and thermal degradation, and as a consequence a red-oil event may be initiated under several operating conditions resulting in severe pressurization of vessel/cell if venting is inadequate. In this work, an attempt was made to understand the reaction pathway of thermal decomposition of nitrated TBP in a flow reactor at atmospheric pressure. Many reaction products were identified and quantified by instrumental methods like HPLC-RI and GC-TCD. The experimental data was analysed with a power law model and the apparent rate constants were estimated. The activation energy for thermal decomposition of nitrated TBP, assuming an Arrhenius type of temperature dependency, was estimated to be 47.39 ± 0.25 kJ·mol−1. The effect of both varying temperature and concentration of nitric acid on conversion of TBP into degradation products and products distribution was experimentally studied. Based on the experimental observations, a reaction mechanism framework for thermal decomposition of nitrated TBP is proposed.
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Affiliation(s)
- Lalit K. Patil
- Department of Chemical Engineering, Institute of Chemical Technology, Mumbai 400019, India
| | - Vilas G. Gaikar
- Department of Chemical Engineering, Institute of Chemical Technology, Mumbai 400019, India
| | - Shekhar Kumar
- Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - U. Kamachi Mudali
- Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - R. Natarajan
- Reprocessing Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
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44
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Jayaraj J, Ravi Shankar A, Kamachi Mudali U. Electrochemical and passive characterization of a beta type Ti45Zr38Al17 cast rod in nitric acid medium. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.08.047] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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45
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Dash D, Kumar S, Mallika C, Mudali UK. New Data on Activity Coefficients of Potassium, Nitrate, and Chloride Ions in Aqueous Solutions of KNO3 and KCl by Ion Selective Electrodes. ACTA ACUST UNITED AC 2012. [DOI: 10.5402/2012/730154] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Ion selective electrodes (ISEs) are used to measure the single-ion activity coefficients in aqueous solutions of KNO3 and KCl at 298.15 K against a double-junction reference electrode. The EMF responses of ISEs up to 0.01 m are plotted to obtain the slope and intercept values. The obtained slopes and intercepts are used in Nernst equation for higher concentrated solutions for calculation of individual ion activity coefficient. The mean ionic activity coefficients are estimated from single ion activity coefficient, and the obtained results are compared with the literature values.
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Affiliation(s)
- Debasmita Dash
- Reprocessing R & D Division, RPG, IGCAR, Kalpakkam 603102, India
| | - Shekhar Kumar
- Reprocessing R & D Division, RPG, IGCAR, Kalpakkam 603102, India
| | - C. Mallika
- Reprocessing R & D Division, RPG, IGCAR, Kalpakkam 603102, India
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46
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Kumar S, Singh A, Sinha PK, Kamachi Mudali U, Natarajan R. Development of a urea-adduct process for recovery of n-alkane based diluent from spent PUREX/UREX solvent. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-1852-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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47
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Sini K, Mishra S, Mallika C, Pandey NK, Lawrence F, Kamachi Mudali U, Natarajan R. Reduction of uranyl nitrate ions in a continuous flow electrochemical reactor. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-1940-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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48
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Velavendan P, Ganesh S, Pandey NK, Geetha R, Ahmed MK, Kamachi Mudali U, Natarajan R. Studies on solubility of TBP in aqueous solutions of fuel reprocessing. J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-1945-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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49
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Gopi D, Indira J, Kavitha L, Sekar M, Mudali UK. Synthesis of hydroxyapatite nanoparticles by a novel ultrasonic assisted with mixed hollow sphere template method. Spectrochim Acta A Mol Biomol Spectrosc 2012; 93:131-134. [PMID: 22472129 DOI: 10.1016/j.saa.2012.02.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2011] [Revised: 02/08/2012] [Accepted: 02/10/2012] [Indexed: 05/31/2023]
Abstract
Hydroxyapatite (HAP) is the main inorganic component of bone material and is widely used in various biomedical applications due to its excellent bioactivity and biocompatibility. In this paper, we have reported the synthesis of hydroxyapatite nanoparticles by a novel ultrasonic assisted mixed template directed method. In this method glycine-acrylic acid (GLY-AA) hollow spheres were used as an organic template which could be prepared by mixing of glycine with acrylic acid. The as-synthesized HAP nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and tunnelling electron microscope (TEM) to investigate the nature of bonding, crystallinity, size and shape. The thermal stability of as-synthesized nanoparticles was also investigated by the thermo gravimetric analysis (TGA). The effect of ultrasonic irradiation time on the crystallinity and size of the HAP nanoparticles in presence of glycine-acrylic acid hollow spheres template were investigated. From the inspection of the above results it is confirmed that the crystallinity and size of the HAP nanoparticles decrease with increasing ultrasonic irradiation time. Hence the proposed synthesis strategy provides a facile pathway to obtain nano sized HAP with high quality, suitable size and morphology.
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Affiliation(s)
- D Gopi
- Department of Chemistry, Periyar University, Salem 636 011, Tamil Nadu, India.
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50
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Balasubramonian S, Kumar S, Sivakumar D, Mudali UK, Natarajan R. PVT properties of N,N,N′,N′-Tetraoctyl-3-oxapentanediamide (TODGA). J Radioanal Nucl Chem 2012. [DOI: 10.1007/s10967-012-1675-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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