Ajoy Mandal
Assistant Controller of Examinations (2nd campus)
About-
During my Ph.D. tenure I have carried out my thesis work entitled “Trace And Ultratrace Scale Studies On Detection And Dynamics Of Fourth Period Elements”. I have used both nuclear and analytical techniques throughout the thesis work. These include namely high purity germanium (HPGe) detector and Compton suppressor system (CSS), Inductively Coupled Plasma Optical Emission Spectroscopy (ICPOES) and Wavelength Dispersive X-ray Fluorescence (WDXRF) for quantitative analysis. I am well trained to smoothly operate all the above mentioned instruments with full confidence. Besides this, I have also hand-on experience to perform beam line experiment for the production of radioisotopes. For this purpose many times I used our BARC-TIFR pelletron accelerator beam facility at Mumbai, and Variable Energy Cyclotron Centre (VECC) beam facility at Kolkata. After that, to carry out all radiochemical analysis I have used our lab installed CANBERRA well type and BALTIC portable type HPGe detector. Noteworthy to mention that I have developed a simplest non-destructive method of potassium determination in NIST SRMs and common vegetable using Compton Suppressor System during my thesis work. To cross check the efficacy of the developed method, I have analyzed the potassium content of the same set of SRM samples by two other methods, namely Inductively Coupled Plasma Optical Emission Spectrometry (ICPOES) (Model no. iCAP 6500 duo, Thermo Fisher Scientific) and Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF) (Make Thermo Scientific, model ARI OPTIM’X). Along with these, I have also studied the uptake of As and Se in different parts of common plant system viz. Mung (V. radiate) by ICPOES to have an insight on the migration and bio-magnification behavior of As and Se. Mars Xpress microwave digester was used for sample preparation.
After the thesis submission I work on synthesis, characterization and applications of anisotropic plasmonic nanoparticles. For characterization and analysis I routinely use several analytical instruments which include: (i) UV-vis spectrophotometer, (ii) Fluorescence spectrophotometer, (iii) Transmission electron microscope (TEM), (iv) X-ray diffraction (XRD), (v) Energy dispersive X-ray spectroscopy (EDX), (vi) Selected-area electron diffraction (SAED), and (vi) Raman spectrophotometer. Among all these optical and spectroscopic instrumentation, nanomaterial-based Raman spectroscopy which commonly known as Surface Enhanced Rama Spectroscopy (SERS) is a state-of-the-art spectroscopic technique finds enormous application in trace level sensing and diagnosis due to its unprecedented signal enhancement ability and finger print spectral information deliverability. UV–visible absorption spectroscopy is used in our study to get the information about the optical and electronic structure of nanoparticles, as the absorption bands are related to the diameter and aspect ratio of metal nanoparticles. TEM is one of the most essential instruments I use frequently to monitor the shape and size of the synthesized nanoparticles.
Along with my usual research activities, I have attended several workshops to broaden my knowledge in analytical instrumentation. As discussed previously, I have direct hand-on experience to handle several sophisticated high sensitive modern analytical instruments and have clear knowledge about their working principle.
School attended during my research period:
First School on Analytical Chemistry-2010, during 20-26 November, 2010 at Bhabha Atomic Research Centre, Mumbai, India.
Country Visited: Avignon, France, May 22-24, 2013 to participate Internationatioal Symposium.
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West Bengal, India
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