I am a visiting assistant professor in the Department of Chemistry at Earlham College, where I have been since fall semester 2019. Before joining Earlham, I was a faculty member at the University of Texas Rio Grande Valley and was a post-doctoral researcher associated at the University of Akron in Ohio. I received an M.S. from Tribhuvan University, Kathmandu, Nepal; and a Master’s and Ph.D. in Chemistry from the University of Akron.
My research interests span (1) in investigating the photophysical properties of donor-acceptor organic materials or polymeric materials, potentially for the use in molecular electronics, and specifically for use in low-cost solar cells (2) in studying the energy level patterns and dynamics of isolated gas species relevant to remote atmospheric sensing, environmental protection, hydrocarbon combustion, and petroleum chemistry, and (3) in studying the various properties of molecules/organometallic complexes using quantum mechanical computational programs.
For personal hobbies, I enjoy cooking and reading.
I love to teach because I love to learn. It is so rewarding to teach and learn with Earlham students, through interactions in the chemistry classroom, in the chemistry lab, through their works, in the community, and as collaborative researchers.
- Ph.D., The University of Akron
- M.S., The University of Akron
- M.S., Tribhuvan University (Nepal)
Photophysics and Solvent Effect on Tautomerism of Free Base Carrole
We investigate the photophysical and electrochemical properties of corrole molecules and how solvent molecules can influence the ability of this molecule to capture light and mimic photosynthesis. A detailed understanding of the photophysical, electrochemical and spectroelectrochemical properties of these molecules is important in order to use porphyrins and corroles in molecular, electronic and photonic devices.
Photophysics, Solvent Effect, and pH effect on Donor-Acceptor Organic Compounds or Polymeric Materials
We investigate the photophysical properties of electron donor-acceptor organic compounds or polymeric materials in the different solvents and in the different and in the different pH values. We use different techniques like electrochemical, emission and absorption, Atomic Force Microscopy, Transmission Electron Microscopy, and Computational modeling. Finally, this project focused on the designing of the photovoltaic devices with better efficiency.
Specifically, in this project we would like to demonstrate that absorption and emission spectroscopy and cyclic voltammetry are the key step to investigate the photophysics of the electron-donor and electron-acceptor molecules and complexes and their suitability in the photovoltaic devices and the overall device performance. The specific objective of work under this proposal is to demonstrate the feasibility of the project so that undergraduate students are able to finish this project on time. This project integrates fundamental research with outreach and communication efforts to engage a diverse group of students in interdisciplinary science, and the community at large, to show how nanotechnology impacts their lives.
High-Resolution IR Spectroscopy of Highly Energized Torsional Molecules
This research project focused on the study of the dynamics of the torsional molecules using various spectroscopic techniques. In this project, we will employ spectroscopic tools to investigate the energy level patterns and dynamics of isolated gas species relevant to remote atmospheric sensing, environmental protection, hydrocarbon combustion, and petroleum Chemistry.
This research project involves the study of the various properties of molecules using quantum mechanical computational programs. This project examines the structures and energies of a variety of molecules, from small torsional molecules, organic compounds, and biologically interesting molecules and ions, to polymers.
- Ultrafast and vibrational spectroscopy, photochemistry and kinetics studies of organometallic complexes and polymeric materials
- Organic Photovoltaic devices or Organic Solar Cells
- Photochemical reactions of atmospheric species
- Conical Intersections of torsional molecules
- Energy level pattern and dynamics of isolated gas molecules relevant to remote atmospheric sensing, environmental protection, hydrocarbon combustion and petroleum Chemistry
- Thin-film coating and TEM
- Phase segregation in novel mesoscopic materials
- Computational chemistry
Mahesh B. Dawadi, C. Michael Lindsay, Andrei Chirokolava, David S. Perry, and Li-Hong Xu :Novel patterns of torsion-inversion-rotation energy levels in the v11 asymmetric CH-stretch spectrum of methylamine, J.Chem.Phys., 138, 104305 (2013). http://dx.doi.org/10.1063/1.4794157
Mahesh B. Dawadi, Ram S.Bhatta, and David S. Perry: Torsion-inversion tunneling patterns in the CH-stretch vibrational excited states of the G12 family of molecules including methylamine, J. Phys.Chem. A. 117, 13356-13367 (2013). http://dx.doi.org/10.1021/jp406668w
Timothy Matney, L. Barrett, Mahesh B. Dawadi, D. Maki, C. Maxton, David S. Perry, D. C. Roper, L. Somers, and L. G. Whitman: In situ shallow subsurface reflectance spectroscopy of archaeological soils and features: a case-study of two Native American settlement sites in Kansas, Journal of Archaeologial Science, 43, 315-324 (2014). http://dx.doi.org/10.1016/j.jas.2013.11.027
Mahesh B. Dawadi and David S. Perry: Communication: Conical intersections between vibrationally adiabatic surfaces in methanol, J.Chem.Phys, 140, 161101 (2014).(Featured Article) http://dx.doi.org/10.1063/1.4871657
Mahesh B. Dawadi, Sylvestre Twagirayezu, David S. Perry, and Brant E. Billinghurst: High-resolution Fourier transform infrared synchrotron spectroscopy of the NO2 in-plane rock band of nitromethane, J. Mol. Spectrosc. 315, 10-15 (2015). http://dx.doi.org/10.1016/j.jms.2014.11.009
Mahesh B. Dawadi, Ram S Bhattaand David S. Perry: Contrasting patterns of coupling between the CH stretches and the large-amplitude motions in the series, CH3NH2, CH3OH2+ and CH3CH2×, Chem. Phys. Lett., 624 53-57 (2015). “Editor Choice” http://dx.doi.org/10.1016/j.cplett.2015.02.009
Bishnu P. Thapaliya, Mahesh B. Dawadi, David S. Perry and Christopher Ziegler: The vibrational Jahn-Teller effect in E⊗e systems, Chem. Phys., 460, 31-42 (2015). http://dx.doi.org/10.1016/j.chemphys.2015.07.017
Abed Hasheminasab, Lei Wang, Mahesh B. Dawadi, Richard S. Herrick, Jeffrey J. Rackand Christopher J. Ziegler: Induction of E/Z isomerization in a pendant metal-boundazobenzene: a synthetic, spectroscopic and theoretical study RSC, Dalton Transactions-Communication 44, 15400-15403 (2015). http://dx.doi.org/10.1039/C5DT02480C
Abed Hasheminasab, Mahesh B. Dawadi, Hamideh Mehr, Richard S. Herrick, and Christopher J. Ziegler: Re(CO)3 Metallopolymers with Complete Metal Monomer in-corporation: Synthetic, Spectroscopic, Electrochemical, and Computational studies ACS Macromolecules, 49(8), 3016-3027 (2016). http://dx.doi.org/10.1021/acs.macromol.6b00343
Mengmeng Zhao, Seyed AliEghtesadi , Mahesh B. Dawadi, Chao Wang, Shuyue Huang , Amy Seymore, Bryan Vogt , Tianbo Liu, David A. Modarelli and Nicole Zacharia: Partitioning of Small Molecules in Hydrogen Bonding Complex Coacervates of Poly(acrylic acid) and Poly(ethylene glycol) or Pluronic Block Copolymer ACS Macromolecules, 50, 3818-3830 (2017). http://dx.doi.org/10.1021/acs.macromol.6b02815
Laura Crandall, Mahesh B. Dawadi, Tailon Burrell, Adwoa Odoom and Christopher J. Ziegler: Structure and electronics in dimeric boron π expanded azine and salphen complexes, Photochemical and photobiological science, 16, 627-632 (2017). (Featured Article) http://dx.doi.org/10.1039/C6PP00479B
Bradley Guislain, Elias Reid, Ronald Lees, Li-Hong Xu, Sylvestre Twagirayezu, David Perry, Bishnu Thapaliya, Mahesh B. Dawadi and Brant Billinghurst: Giant K-doubling and in-plane/out-of-plane mixing in the asymmetric methyl-bending bands of CH3SH J. Mol. Spectrosc. 335, 37- 42(2017) http://dx.doi.org/10.1016/j.jms.2017.02.016
Mingyang Ji, Mahesh B. Dawadi, Alexandria R. LaSalla, Yuan Sun, David A. Modarelli and Jon R. Parquette: A strategy for the co-assembly of co-axial nanotube-polymer hybrids. Langmuir, 33 (36), 9129-9136 (2017). http://dx.doi.org/10.1021/acs.langmuir.7b02245
Mahesh B. Dawadi, Bishnu P. Thapaliya and David S. Perry, An Extended E⊗e Jahn-Teller Hamiltonian for Large-Amplitude Motion: Application to Vibrational Conical Intersections in CH3SH and CH3OH, J. Chem. Phycs. 147, 044306 (2017). http://dx.doi.org/10.1063/1.4994699
Ronal Lees, Li-Hong Xu, Bradley Guislain, Elias Reid, Sylvestre Twagirayezu, David S. Perry, Mahesh B. Dawadi, Bishnu P. Thapaliya and Brant Billinghurst: Torsion-rotation structure and quasi-symmetric-rotor behaviour for the CH3SH asymmetric CH3-bending and C-H stretching bands E parentage. J. Mol. Spectrosc. 343, 18-27 (2018). http://dx.doi.org/10.1016/j.jms.2017.06.013
Mahesh B. Dawadi, Lou Degliumberto, David S. Perry, Howard D. Mette and Robert L. Sams: High -resolution infrared spectroscopy of the asymmetric NO stretch band of jet-cooled nitromethane and assignment of the lowest four torsional states J. Mol. Spectrosc. 343, 85-91 (2018). http://dx.doi.org/10.1016/j.jms.2017.08.001
Shuyue Huang, Mengmeng Zhao, Mahesh B. Dawadi, Yuhang Cai, Yakov Lapitsky, David A Modarelli, Nicole Zacharia: Effect of Small Molecules on the Phase Behavior and Coacervation of Aqueous Solutions of Poly(diallyldimethylammonium chloride) and Poly(sodium 4-styrene sulfonate), J. Colloid Interface Sci. (2018) https://dx.doi.org/10.1016/j.jcis.2018.02.029
Mengmeng Zhao, Xuhui Xia, Jingyi Mao, Chao Wang, Mahesh B. Dawadi, David A. Modarelli, and Nicole Zacharia: Composition and Property Tunable Ternary Coacervate: Branched Polyethylenimine and a Binary Mixture of a Strong and Weak Polyelectrolyte, Mol. Syst. Des. Eng. (2019). https://dx.doi.org/10.1039/C8ME00069G
R.M Lees, Li-Hong Xu, S. Twagirayezu, D.S. Perry, MaheshB. Dawadi, and B.E. Billinghurst,: FTIR synchrotron spectroscopy of the S-H stretching fundamental of the 12CH3 32SH species of methyl mercaptan, Mol. Phys. (2018). https://dx.doi.org/10.1080/00268976.2018.1451931
Mengmeng Zhao, Chao Wang, Haowei Jiang, Mahesh B. Dawadi, Bryan D. Vogt, David A. Modarelli and Nicole. S. Zacharia: Polyelectrolyte–micelle coacervates: intrapolymer-dominant vs. interpolymer-dominant association, solute uptake and rheological properties, Soft Matter (2019). https://dx.doi.org/10.1039/C8SM02229A