@proceedings {43316,
	title = {Design and engineering of organic molecules for customizable terahertz tags},
	volume = {8985},
	year = {2014},
	month = {FEB},
	pages = {Article Number: UNSP 89850P},
	publisher = {SPIE-Int Soc Optical Engineering, 1000 20th ST, PO Box 10, Bellingham, WA 98227-0010 USA},
	address = {San Francisco, CA},
	abstract = {<p>Terahertz (THz) frequency band lies between the microwave and infrared region of the electromagnetic spectrum. Molecules having strong resonances in this frequency range are ideal for realizing "Terahertz tags" which can be easily incorporated into various materials. THz spectroscopy of molecules, especially at frequencies below 10 THz, provides valuable information on the low frequency vibrational modes, viz. intermolecular vibrational modes, hydrogen bond stretching, torsional vibrations in several chemical and biological compounds. So far there have been very few attempts to engineer molecules which can demonstrate customizable resonances in the THz frequency region. In this paper, Diamidopyridine (DAP) based molecules are used as a model system to demonstrate engineering of THz resonances (\&lt; 10 THz) by fine-tuning the molecular mass and bond strengths. Density Functional Theory (DFT) simulations have been carried out to explain the origin of THz resonances and factors contributing to the shift in resonances due to the addition of various functional groups. The design approach presented here can be easily extended to engineer various organic molecules suitable for THz tags application.</p>},
	doi = {10.1117/12.2041194},
	author = {Ray, Shaumik and Dash, Jyotirmayee and Nallappan, Kathirvel and Kaware, Vaibhav and Basutkar, Nitin and Ambade, Ashootosh and Joshi, Kavita and Pesala, Bala}
}
@article {49875,
	title = {Poly(2,5-Benzimidazole)-based flat sheet membranes: investigating effects of dope solvent and membrane heat treatment on forward osmosis and acid enrichment performances},
	journal = {Journal of Applied Polymer Science},
	volume = {143},
	year = {2026},
	month = {MAR },
	type = {Article},
	abstract = {<p>
	The present work investigates two methods for preparing defect-free, symmetric membranes of the thermochemically robust polymer, poly(2,5-benzimidazole) (commonly known as ABPBI) for forward osmosis (FO), a growing technology for niche separations. The obtained polymer and membranes were analyzed for physical properties of significance. The FO analysis was performed using three salt solutions, viz., sodium chloride (NaCl), magnesium chloride (MgCl2), and sodium sulfate (Na2SO4). The effects of casting methodology (solvents present in the dope), membrane heat treatment, draw solution concentration, long-duration analysis, and FO-assisted enrichment of organic acids were evaluated. Some of the membranes exhibited extremely low reverse salt flux (RSF), which conveys the novelty of these membranes. Some of these membranes were analyzed using a high draw solution (DS) concentration (4 mol L-1) to enhance water flux and further employed to enrich organic acids. The aqueous acetic and methacrylic acid concentrations were enriched from 4.89 and 2.93 mol L-1 to 11.88 and 10.01 mol L-1, respectively. These results demonstrate an unmet need of concentrating methacrylic acid (a temperature-sensitive compound possessing a double bond). The present work demonstrates the potentials of ABPBI-based symmetric, thin membranes for FO and their industrial applicability for the first time.</p>
},
	keywords = {Applications, membranes, separation techniques},
	issn = {0021-8995},
	doi = {10.1002/app.70257},
	author = {Somkuwar, Nitin C. and Thorat, Nitin M. and Ambade, Ashootosh and Kharul, Ulhas K.}
}
