01756nas a2200157   4500008004100000245005800041210005700099260000800156490000600164520124600170100001501416700002201431700002301453700003101476856009101507       2017                        eng d00aSolution processed cellulose/melanin films and fibres0 aSolution processed cellulosemelanin films and fibres  cJUN0 v53 aMelanins constitute a class of biomacromolecules that are abundant in nature. Although they exhibit a unique range of physical and chemical properties, their intractable nature has precluded their dissolution in common solvents and facile processing into functional materials. The authors found that commercially available 40 wt% tetrabutylammonium hydroxide (Tbah) solution could yield stable solutions of synthetic and natural melanins at ambient conditions and the dissolution rate could be accelerated by microwave radiation. Transmission electron microscopy images clearly show the disruption of the aggregated structure of melanins in Tbah. Scanning electron microscopy images of melanin/Tbah solutions precipitated in acetone revealed that melanins are dissolved and regenerated and not merely dispersed. To the best of the authors’ knowledge, this is the first report demonstrating a facile approach to solution processing melanins with other biopolymers, which allows leverage of many unique properties of melanins. As an illustrative example, the authors demonstrate here the successful fabrication of cellulose/melanin composite films and fibers and their significant dye absorption capacity (62% reduction) with methylene blue.1 aFarsa, Ram1 aPimpalkar, Nikhil1 aShete, Abhijit, P.1 aShanmuganathan, Kadhiravan  uhttp://library.ncl.res.in/content/solution-processed-cellulosemelanin-films-and-fibres01839nas a2200277   4500008004100000022001400041245012000055210006900175260000900244300002600253490000800279520088000287653002401167653002301191653001801214653001801232653001701250653002301267100002201290700002001312700002201332700002201354700002601376700003101402856012801433       2019                        eng d  a0927-775700aSustained release insect repellent microcapsules using modified cellulose nanofibers (mCNF) as pickering emulsifier0 aSustained release insect repellent microcapsules using modified   cDEC   aArticle Number:1238830 v5823 a<p>We report here an approach to encapsulate N, N-diethyl-3-methylbenzamide (DEET), an insect repellent, through interfacial polycondensation using modified cellulose nanofiber (CNF) as pickering emulsifier. We found that stearic acid functionalized CNF (mCNF) can be used to form stable pickering emulsions (oil-in-oil and water-in-oil), and further encapsulate DEET using interfacial polycondensation with very high encapsulation efficiency of about 98%. Another major advantage of this approach is that mCNF can act both as pickering emulsifier and also strengthen the barrier properties of microcapsules resulting in significant reduction in release rate of DEET. Interpretation of the release profiles using standard mathematical models proposed by Ritger-Peppas show a factor of three reduction in release rate constant for the microcapsules reinforced with mCNF.</p>
10aCellulose nanofiber10aControlled release10aMicrocapsules10aNanocomposite10ananoparticle10aPickering emulsion1 aKadam, Sandip, L.1 aYadav, Prashant1 aBhutkar, Siddhant1 aPatil, Vishal, D.1 aShukla, Parshuram, G.1 aShanmuganathan, Kadhiravan  uhttp://library.ncl.res.in/content/sustained-release-insect-repellent-microcapsules-using-modified-cellulose-nanofibers-mcnf02507nas a2200253   4500008004100000022001400041245012300055210006900178260000800247300001100255490000700266520164100273653002201914653002601936653002101962653002601983653001302009653001602022100001902038700001802057700002402075700003102099856012302130       2023                        eng d  a0969-023900aSynthesis of N-oxyethylene substituted imidazolium-based zwitterions as a recyclable solvent for cellulose dissolution0 aSynthesis of Noxyethylene substituted imidazoliumbased zwitterio  cJAN  a87-1090 v303 a<p>
	Cellulose is a readily available, renewable, and natural biomaterial that has the potential to replace synthetic fibres. However, their processing to shaped materials such as fibre or film is still complex and restricted due to its insolubility in most conventional solvents. Herein, we present the synthesis and cellulose dissolution characteristics of a new class of recyclable zwitterions composed of tethered N-oxyethylene substituted imidazolium cation and alkyl carboxylate anion. Investigations on cellulose dissolution showed that increasing the alkyl chain length of carboxylate anion and introduction of oxyethylene unit on imidazolium ring led to better cellulose dissolution ability, and up to 12% (w/w) cellulose could be dissolved in aqueous zwitterions at 105 degrees C. The thermal behavior of zwitterions and their cellulose solutions was characterized by TGA and found to be more stable than the NMMO and Lyocell solutions. Rheological characterization of cellulose solutions revealed viscoelastic behavior and zero shear viscosity of 6-12% (w/w) cellulose solution in hexanoate containing aqueous zwitterion was 555 to 5900 Pa.s at 120 degrees C. The characteristics of cellulose solution indicate its potential for processing to cellulose fibre by extrusion through a tiny spinneret. Physico-chemical analysis of regenerated cellulose indicates that zwitterions cause no adverse effect on cellulose structure and morphology during dissolution. The zwitterions are recovered after the cellulose regeneration process, and the recovery was found to be 99.6% after purification using the ion-exchange method.</p>
10aCarboxylate anion10aCellulose dissolution10aOxyethylene unit10aRegenerated cellulose10aRheology10azwitterions1 aJadhav, Sachin1 aGanvir, Vivek1 aSingh, Madan, Kumar1 aShanmuganathan, Kadhiravan  uhttp://library.ncl.res.in/content/synthesis-n-oxyethylene-substituted-imidazolium-based-zwitterions-recyclable-solvent00810nas a2200217   4500008004100000022001400041245012800055210006900183260000900252490000800261653001400269653002300283653002400306100001900330700002100349700001900370700001800389700002400407700003100431856013000462       2025                        eng d  a0144-861700aStructure and properties of the cellulose fibres spun from imidazolium-based carboxylate functionalized zwitterionic liquid0 aStructure and properties of the cellulose fibres spun from imida  cJAN 0 v34810acellulose10aDirect dissolution10aZwitterionic liquid1 aJadhav, Sachin1 aSingh, Dhirendra1 aGupta, Deepika1 aGanvir, Vivek1 aSingh, Madan, Kumar1 aShanmuganathan, Kadhiravan  uhttp://library.ncl.res.in/content/structure-and-properties-cellulose-fibres-spun-imidazolium-based-carboxylate-functionalized