N
Nirmala Devi
Researcher at Academy of Scientific and Innovative Research
Publications - 18
Citations - 54
Nirmala Devi is an academic researcher from Academy of Scientific and Innovative Research. The author has contributed to research in topics: Terahertz spectroscopy and technology & Terahertz radiation. The author has an hindex of 4, co-authored 18 publications receiving 38 citations. Previous affiliations of Nirmala Devi include Central Electronics Engineering Research Institute & Council of Scientific and Industrial Research.
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Journal ArticleDOI
Non-invasive macroscopic and molecular quantification of water in Nafion® and SPEEK Proton Exchange Membranes using terahertz spectroscopy
Nirmala Devi,Nirmala Devi,Shaumik Ray,Shaumik Ray,Avanish Shukla,Avanish Shukla,Santoshkumar D. Bhat,Santoshkumar D. Bhat,Bala Pesala,Bala Pesala +9 more
TL;DR: In this paper, terahertz spectroscopy measurements for hydrated Nafion and sulphonated Polyether Ether Ketone (sPEEK) membranes in ambient atmosphere have been carried out for 100 minutes.
Journal ArticleDOI
Fine-tuning of Terahertz resonances in hydrogen-bonded organic molecular complexes
Jyotirmayee Dash,Jyotirmayee Dash,Shaumik Ray,Shaumik Ray,Nirmala Devi,Nirmala Devi,Nitin Basutkar,Ashootosh V. Ambade,Ashootosh V. Ambade,Bala Pesala,Bala Pesala +10 more
TL;DR: In this paper, the authors designed and synthesized binary organic molecular complexes to obtain prominent terahertz (THz) resonances in the low-frequency region, and fine-tuned the THz resonances of the complexes by varying the number of benzene rings in the DAP moiety.
Journal ArticleDOI
Comparative Study of Hydration Kinetics of Cement and Tricalcium Silicate Using Terahertz Spectroscopy and Density Functional Theory Simulations
Shaumik Ray,Shaumik Ray,Jyotirmayee Dash,Jyotirmayee Dash,Nirmala Devi,Nirmala Devi,Saptarshi Sasmal,Saptarshi Sasmal,Bala Pesala,Bala Pesala +9 more
TL;DR: In this paper, the origin and variation of terahertz (THz) resonances of C3S, C-S-H polymorphs and Ca(OH)2 have been analyzed using density functional theory simulations.
Proceedings ArticleDOI
Understanding the effect of nanosilica incorporation on dicalcium silicate hydration using terahertz spectroscopy
Shaumik Ray,Shaumik Ray,Jyotirmayee Dash,Jyotirmayee Dash,Nirmala Devi,Nirmala Devi,Saptarshi Sasmal,Saptarshi Sasmal,Bala Pesala,Bala Pesala +9 more
TL;DR: In this article, Terahertz spectroscopy has been employed to track the acceleration of hydration of C2S due to the addition of nanosilica, which accelerates the hydration along with the formation of greater amount of calcium silicate hydrate (C-S-H).
Proceedings ArticleDOI
Hydration kinetics of cement composites with varying water-cement ratio using terahertz spectroscopy
Shaumik Ray,Shaumik Ray,Jyotirmayee Dash,Jyotirmayee Dash,Nirmala Devi,Nirmala Devi,Saptarshi Sasmal,Bala Pesala,Bala Pesala +8 more
TL;DR: In this article, the authors employed THz spectroscopy to track the variation in hydration kinetics for concrete samples with different water-cement ratios, viz., 0.3, 0.4, 0.5 and 0.6.