02203nas a2200169   4500008004100000022001400041245008600055210006900141260011000210300001600320490000600336520150700342100002201849700002801871700002201899856011201921       2014                        eng d  a2050-748800aFluorescent polymeric ionic liquids for the detection of nitroaromatic explosives0 aFluorescent polymeric ionic liquids for the detection of nitroar  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcJUL  a13983-139890 v23 a<p>We report, for the first time, applicability of film forming polymeric ionic liquids (PILs) possessing pyrene and anthracene fluorophores for the detection of nitroaromatics (NACs). These functionalized PILs were synthesized via post modification of thermo-chemically and mechanically stable polybenzimidazole (PBI). Formed PILs were evaluated for their ability to detect NACs through quenching of fluorescence intensity. Quenching of fluorescence intensity in solution state for NACs, such as nitrobenzene (NB), 2,4,6-trinitrotoluene (TNT) and picric acid (PA), was found to be rapid in both the PILs possessing pyrene and anthracene. The solution-phase Stern-Volmer quenching constants for PA were higher than for other NACs. After these promising results, self-standing films (similar to 12 mm thick) were also evaluated for fluorescence quenching by NACs as well as possible interferents of different nature. These films also exhibited rapid and selective fluorescence quenching when exposed to the saturated vapors of NACs at ambient temperature and pressure. Fluorescence emission of PIL films was affected little by the presence of commonly found interferents. Furthermore, fluorescence intensity could be recovered after the quenching, enabling the reuse of these PIL films for detection of NACs. Smart performance of these films and ease of preparation qualify them as attractive candidates in developing sensor devices for sensitive NACs detection in presence of possible interferents.</p>1 aShaligram, Sayali1 aWadgaonkar, Prakash, P.1 aKharul, Ulhas, K.  uhttps://library.ncl.res.in/content/fluorescent-polymeric-ionic-liquids-detection-nitroaromatic-explosives-002400nas a2200265   4500008004100000022001400041245012200055210006900177260000800246300001400254490000700268520148900275653001701764653003801781653002001819653001401839653003901853653001501892653001801907100002201925700001901947700002101966700002301987856012402010       2025                        eng d  a1944-824400aHighly permselective contorted polyamide desalination membranes with enhanced free volume fabricated by mLbL assembly0 aHighly permselective contorted polyamide desalination membranes   cJAN  a9716-97270 v173 a<p>
	The permeability-selectivity trade-off in polymeric desalination membranes limits the efficiency and increases the costs of reverse osmosis and nanofiltration systems. Ultrathin contorted polyamide films with enhanced free volume demonstrate an impressive 8-fold increase in water permeance while maintaining equivalent salt rejection compared to conventional polyamide membranes made with m-phenylenediamine and trimesoyl chloride monomers. The solution-based molecular layer-by-layer (mLbL) deposition technique employed for membrane fabrication sequentially reacts a shape-persistent contorted diamine monomer with a trimesoyl chloride monomer, forming highly cross-linked, dense polyamide networks while avoiding the kinetic and mass transfer limitations of traditional interfacial polymerization. The mLbL process allows precise nanoscale control over polyamide selective layer thickness, network structure, and surface roughness. The resulting controlled film thicknesses enable direct measurements of water and NaCl permeabilities. The permselectivities of contorted polyamide membranes surpass those of commercial desalination membranes and approach the reported polyamide upper bound. Solution-diffusion transport modeling indicates that this high permselectivity may be attributed to enhanced water transport pathways in the contorted polyamides that increase water diffusivity-permeability while maintaining high solute rejection through solubility-selectivity.</p>
10aDesalination10amolecular layer-by-layer assembly10apermselectivity10apolyamide10apolymers of intrinsicmicroporosity10atriptycene10aTroger's base1 aShaligram, Sayali1 aShevate, Rahul1 aPaul, Siddhartha1 aShaffer, Devin, L.  uhttps://library.ncl.res.in/content/highly-permselective-contorted-polyamide-desalination-membranes-enhanced-free-volume