Research
Designing Ionic Liquid Self Assembly, Structural and Dynamics Study: Time Resolve Fluorescence Spectroscopy:
We have design various ionic liquid containing self assemble structure like micelle, reverser micelle, microemulsion etc. The results show that nanostructure are mono dispersed and quite stable. This nanostructure was used as a template to synthesis silver nanoparticles. Time resolved fluorescence spectroscopy shows the dynamics of ionic liquid in comparison to bulk ionic liquids. From dynamics study we can calculate micro-viscosity of ionic liquid in nanoconfined media and made comparison with pure ionic liquids. The micro-viscosity of ionic liquid in confined media and dynamics of pure ionic liquids shows strong correlation.
Single Molecule Tracking and Dichroism Measurements: Single Molecule Fluorescence Microscopy:
We have directly recorded single molecule motions in the one-dimensional (1D) channels of nanostructured materials by single molecule tracking (SMT) methods. SMT methods afford unique advantages over other ensemble methods such as FCS, of SAXS in that 1D molecular motions can be directly visualized. While such methods are well known, our unique contributions include their use for quantitative assessment of channel organization. The results showed that the dye diffused within the micelle cores and that materials produced by flow alignment in microfluidic channels were extremely well ordered. In our most exciting work, we have since moved on to study single molecule orientational wobbling (i.e., confined orientational motions) within the surfactant-filled cylindrical pores of mesoporous silica. In these studies, we simultaneously record SMT data in two orthogonal polarizations. The dichroism data affords a highly quantitative measure of the degree to which the orientational motions of the molecules are confined within the pores. The results yield an in situ measure of the accessible cavity diameter with ~ 0.2 nm precision, much better than can presently be achieved by super-localization microscopy methods reported in the literature.
Development of Fluorescence Sensors for Detecting Metals Ion:
More recently, the toxic metal ions and biological molecular sensing and bioimaging applications have increasing attracted to attention of researchers. 1, 8-Naphthalimide (NI), Naphthalene diimide (NDI), Perylene bisimide (PBI) and its derivatives play a key role in fluorescent material and dye field. In addition, the special structure of NI, NDI and PBI endow them excellent properties, high electron affinity, good thermal stability and oxidation stability, this has led to their development and application receiving widespread attention. Naphthalimide, as the “simplest” molecule, has better water solubility than the other molecules such as NDI and PBI. Therefore, the study of naphthalimide derivatives has become a hot topic. Given the excellent photophysical properties and stability, 1,8 naphthalimide-based fluorescent probe has enormous potential for developing chemical sensors. However, using 1,8 naphthalimide-based fluorescent probe have not yet been fully developed for metal sensing. Therefore, it is necessary to design fluorescent probe for the various applications based on 1.8-naphthalimide and its derivatives. Our goals to design the chemosensors and materials applications of 1.8-naphthalimide research, including ion detection, molecular recognition, material preparation, bioimaging and other fields.
The NDI and PBI dyes are widely used sensors in organic media thanks to their high fluorescence quantum yields (QY), absorption and emission spectra, which can be easily tuned in the visible region from green to red and near-IR. Given the hydrophobic nature of these dyes and high QY, these can be used to detect bio-molecules present in complex self assemble structure. Perylene bisimide (PBI) is highly photo-stable and widely used as a single molecule probes in wide field microscopy imaging.
We are hoping for the development of more powerful fluorescent chemosensors for broad and exciting applications in the future.
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Published Papers
19. Nanomaterial-Enhanced Fluorescence Sensors for Dopamine Neurotransmitters: A Photophysical Perspective.
Rajib Pramanik*. Analytical Methods, Publisher: Royal Society of Chemistry. Just Accepeted 29th April. Published on: 30th April, 2025. https://doi.org/10.1039/D5AY00300H
18. A Review on Fluorescent Molecular Probes for Hg2+ Ion Detection: Mechanisms, Strategies, and Future Directions.
Rajib Pramanik*. ChemistrySelect, 10 (2025) e202404525. Publisher: Wiley. Published on March 2025. https://doi.org/10.1002/slct.202404525
17. Advancement in Glucose Biosensors and Current Development of Electrochemical Sensing
Rajib Pramanik,* Mohammed Ikbal, Nimai Mishra, Shabnam Parvin, Rabiul Hoque. Current Physical Chemistry, 15 (2025) 2-127. Publisher: Bentham Science. Accepted on August 08th, 2024, DOI: 10.2174/0118779468328947240823182638
16. Modulation of Triton X-100 Aqueous Micelle Interface by Ionic Liquid: A Molecular Level Interaction Studied by Time-resolved Fluorescence Spectroscopy.
Rajib Pramanik* and Sagar Srivastava. Current Physical Chemistry, 14 (2024) 116-132. Publisher: Bentham Science. Published on: 26th January, 2024. DOI: https://doi.org/10.2174/0118779468263953231022204147
15. Visible light-triggered Pyrazole-Functionalized Reversible Ionophore for Selective Monitoring of Aluminium (III) ion.Suvojit Roy, Subhankar Kundu, Subhajit Saha, K. Muddukrishnaiah, Rajib Pramanik, and Bhaskar Biswas. Applied Organimetallic Chemistry, 36 (2022) e6865. https://doi.org/10.1002/aoc.6865
14. Photoluminescence Imaging of Polyfluorene Surface Structures on Semiconducting Carbon Nanotubes: Implications for Thin Film Exciton Transport.Nicolai F. Hartmann, Rajib Pramanik, Anne-Marie Dowgiallo, Rachelle Ihly, Jeffery L. Blackburn, and Stephen K. Doorn. ACS Nano, 10 (2016) 11449. https://doi.org/10.1021/acsnano.6b07168
13. Molecular Length Dependence of Single Molecule Wobbling within Surfactant- and Solvent-Filled Silica Mesopores.
Rajib Pramanik, Takashi Ito, and Daniel A. Higgins. J. Phys. Chem. C 117 (2013) 15438
12. Single Molecule Wobbling in Cylindrical Mesopores.
Rajib Pramanik, Takashi Ito, and Daniel A. Higgins. J. Phys. Chem. C 117 (2013) 3668.
11. To Probe the Interaction of Methanol and Acetonitrile with the Ionic Liquid N, N, NTrimethyl-N-propyl Ammonium Bis(trifluoromethanesulfonyl) Imide at Different Temperatures by Solvation Dynamics Study.
Rajib Pramanik, Vishal GovindRao, SouraviSarkar, ChiranjibGhatak, PalashSetua, and NilmoniSarkar. J. Phys. Chem. B 113 (2009) 8626.
10. Effect of polymer, poly(ethylene glycol)(PEG-400), on solvent and rotational relaxation of coumarin-480 in an ionic liquid containing microemulsions.Rajib Pramanik, SouraviSarkar, ChiranjibGhatak, PalashSetua and NilmoniSarkar. Phys. Chem. Chem. Phys. 12 (2010) 3878.
9. Microemulsions with Surfactant TX100, Cyclohexane, and an Ionic Liquid Investigated by Conductance, DLS, FTIR Measurements, and Study of Solvent and Rotational Relaxation within this Microemulsion. Rajib Pramanik, SouraviSarkar, ChiranjibGhatak, Vishal GovindRao, PalashSetua, and NilmoniSarkar. J. Phys. Chem. B 114 (2010) 7579.
8. Ionic Liquid Containing Microemulsions: Probe by Conductance, Dynamic Light Scattering, Diffusion-Ordered Spectroscopy NMR Measurements, and Study of Solvent Relaxation Dynamics.Rajib Pramanik, SouraviSarkar, ChiranjibGhatak, Vishal GovindRao, NilmoniSarkar. J. Phys. Chem. B 115 (2011) 2322.
7. Effect of Ionic Liquid in TX100 Aqueous Micelle: Solvent and Rotational Relaxation Study.Rajib Pramanik, SouraviSarkar, ChiranjibGhatak, Vishal GovindRao, NilmoniSarkar. J. Phys. Chem. B 115 (2011) 6957.
6. Room Temperature Ionic Liquids in Confined Media: A Temperature Dependence Sovation Dynamics Study in [bmim][BF4]/BHDC/Benzene Reverse Micelle.Rajib Pramanik, ChiranjibGhatak, Vishal GovindRao, SouraviSarkar, NilmoniSarkar. J. Phys. Chem. B 115 (2011) 5971
.5. Probing the Interaction of 1-Ethyl-3-methylimidazolium Ethyl Sulfate ([Emim][EtSO4]) with Alcohols and Water by Solvent and Rotational Relaxation.SouraviSarkar, Rajib Pramanik, ChirajibGhatak, PalashSetua, NilmoniSarkar. J. Phys. Chem. B 114 (2010) 2779.
4. Solvent and rotational relaxation of Coumarin-153 in a micellar solution of a room temperature ionic liquid, 1-butyl-3-methylimidazolium octyl sulfate, in ethylammonium nitrate.Vishal GovindRao, ChirajibGhatak, Rajib Pramanik, SouraviSarkar, NilmoniSarkar. Chem. Phys. Lett. 499 (2010) 89.3. Synthesis of Silver Nanoparticle Inside the Nonaqueous Ethylene Glycol Reverse Micelle: the Effect of the Nanoparticle on the Reverse Micellar Aggregates through Solvation Dynamics and Rotational Relaxation Measurements.PalashSetua, Rajib Pramanik, SouraviSarkar, ChirajibGhatak, S. K. Das, NilmoniSarkar. J. Phys. Chem. B 114 (2010) 7557.
2. Direct Observation of Solvation Dynamics in an Aqueous Reverse Micellar System Containing Silver Nanoparticles in the Reverse Micellar Core.PalashSetua, Rajib Pramanik, SouraviSarkar, Debabrata Seth, NilmoniSarkar. J. Phys. Chem. B 113 (2009) 5677.
1. Photoinduced electron transfer (PET) from N,N-dimethylaniline to 7-amino Coumarin dyes in a room temperature ionic liquid (RTIL): Slowing down of electron transfer rate compared to conventional solvent. SouraviSarkar ,Rajib Pramanik, Debabrata Seth, PalashSetua, NilmoniSarkar. Chem. Phys. Lett. 477 (2009) 102
Seminar and Conference Attained::
1. Fluorescence 2009: Fluorescence in Biology. An International Conference. March 16–19, 2009. Tata Institute of Fundamental Research, Mumbai, India.
2. 47th Midwest Regional ACS Meeting, October 24-27, 2012; Omaha, NE, United States
3. International Conference on Carbon Nanomaterials WONTON Jun, 16-20, 2013 Santa Fe, United States
4. 2014 MRS Fall Meeting, November 30-December 5, 2014, Boston, United States
5. TechConnect World/Nanotech 2015 June, 14-17, 2015 Washington, DC, United States
6. Photochemistry Gordon Research Conference, July 19 - 24, 2015, Stonehills College, United States
7. ARVO 2016 Annual Meeting, May 1-5, 2016, Seattle, United States
