@article {43376,
	title = {Clickable polyurethanes based on s- triazine ring containing aromatic diisocyanate bearing pendent alkyne group: synthesis and postmodification},
	journal = {Journal of Polymer Science Part A Polymer Chemistry},
	volume = {55},
	year = {2017},
	month = {MAR},
	pages = {1008-1020},
	type = {Article},
	abstract = {A new s-triazine ring containing aromatic diisocyanate bearing a pendent alkyne group, namely, 2,4-bis(4-isocyanatophenoxy)-6-(prop-2-yn-1-yloxy)-1,3,5-triazine was synthesized and reacted with various diols viz., 1,10-decanediol, tetraethylene glycol and polyethylene glycols in the presence of dibutyltin dilaurate as the catalyst to obtain a series of linear polyurethanes. The selected polyurethanes possessing pendent alkyne groups were postmodified with chemically diverse azides viz., 1-(azidomethyl)benzene, 1-(azidomethyl)pyrene, and methoxy end-caped poly(ethylene glycol) azide via copper-catalysed azide-alkyne Huisgen 1,3-dipolar cycloaddition. FTIR and 1H NMR spectra indicated quantitative click reaction. UV{\textendash}vis and fluorescence spectroscopic analysis confirmed complete incorporation of pyrenyl groups indicating the formation of fluorescence active polyurethane by postmodification with 1-(azidomethyl)pyrene. TG analysis of polyurethanes indicated two stage weight loss and their thermal stability, as judged by T10 values, was governed by weight percent of urethane linkages. The water contact angle measurements revealed improved wettability with increased content of PEG either in the backbone of polyurethanes or as grafted chains. DLS and TEM studies confirmed that certain polyurethanes possessing PEG segments displayed self-assembly in aqueous solution, which was further supported by pyrene encapsulation studies using UV{\textendash}vis spectroscopy. {\textcopyright} 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 1008{\textendash}1020},
	keywords = {Click chemistry, Diisocynate, Polyethelene Glycol, polyurethanes, Self- Assembly},
	doi = {10.1002/pola.28461},
	author = {Garg, Kavita and Chatterjee, Deepshikha and Wadgaonkar, Prakash}
}
@article {43928,
	title = {Template -free assembly in living bacterial suspension under an external electric field},
	journal = {ACS Omega},
	volume = {2},
	year = {2017},
	month = {MAR},
	pages = {1019-1024},
	type = {Journal Article},
	abstract = {<p>Although template-assisted self-assembly methods are very popular in materials and biological systems, they have certain limitations such as lack of tunability and switchable functionality because of the irreversible association of cells and their matrix components. With an aim to achieve more tunability, we have made an attempt to investigate the self-assembly behavior of rod-shaped living bacteria subjected to an external alternating electric field using confocal microscopy. We demonstrate that rod-shaped living bacteria dispersed in a low salinity aqueous medium form different types of reversible freely suspended structures when subjected to an external alternating electric field. At low field strength, an oriented phase is observed where individual bacterium orients with its major axis aligned along the field direction. At intermediate field strength, bacteria align in the form of one-dimensional (1D) chains that lie along the field direction. Further, at high field strength, more bacteria associate with these 1D chains laterally to form a two-dimensional (2D) array. At higher bacterial concentration, these field-induced 2D arrays extend to form three-dimensional columnar structures. These results are discussed in the context of previously reported studies on bacterial self-assembly.</p>},
	keywords = {Bacteria, Electric Properties, Self- Assembly},
	doi = {10.1021/acsomega.6b00541},
	author = {Samantaray, Kunal and Bhol, Prachi and Sahoo, Bhaban and Barik, Subrat Kumar and Jathavedan, Kiran and Sahu, Bikash Ranjan and Bikash Ranjan and Suar, Mrutyunjay and Bhat, Suresh K. and Mohanty, Priti Sunda}
}
