02264nas a2200229   4500008004100000022001400041245010800055210006900163260009900232300001000331490000700341520139900348653001801747653001301765653001901778653001301797653002201810100002801832700002901860700002601889856011901915       2016                        eng d  a0032-386100aImproved performance of microcapsules with polymer nanocomposite wall: preparation and characterization0 aImproved performance of microcapsules with polymer nanocomposite  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcJAN  a27-330 v833 a<p>Polyurea/clay nanocomposite microcapsules containing dimethyl phthalate (DMP) as a model compound were prepared by interfacial polymerization technique. Nanoclays namely, montmorillonite Na+ (MMT) and Laponite were incorporated into microcapsule wall and their effects on morphology, thermal properties and release of DMP from microcapsules were investigated. All microcapsules were characterized using scanning electron microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy. The present preparation process results in formation of polyurea/clay nanocomposite microcapsule wall with intercalated clay layered as evidenced by XRD and TEM. Nanocomposite microcapsules have shown significant reduction in release of DMP and change in release mechanism as compared to the pristine microcapsules. Nanocomposite microcapsules show good improvement in the fracture strength as compared to pristine microcapsules. The approach used herein is simple and can be adopted to many other polymeric microcapsule systems prepared by different microencapsulation techniques, requiring reduction in release rate and/or mechanism for several applications like pharmaceuticals, agrochemicals, industrially important chemicals, consumer products, etc. (C) 2015 Elsevier Ltd. All rights reserved.</p>10aMicrocapsules10aNanoclay10aNanocomposites10aPolyurea10aRelease mechanism1 aJagtap, Siddheshwar, B.1 aMohan, Muthu, Subramania1 aShukla, Parshuram, G.  uhttps://library.ncl.res.in/content/improved-performance-microcapsules-polymer-nanocomposite-wall-preparation-and-002013nas a2200181   4500008004100000245012100041210006900162260000800231300001400239490000800253520131800261100002601579700002801605700002401633700002401657700002101681856012901702       2016                        eng d00aPreparation and characterization of microcapsules containing industrially important reactive water-soluble polyamine0 aPreparation and characterization of microcapsules containing ind  cDEC  a2039-20500 v2943 aPolyurea microcapsules containing water-soluble reactive polyamine, namely, polyaziridine (A33), were prepared by interfacial polymerization technique in non-aqueous medium, wherein (i) A33 was encapsulated for the first time as a neat amine without forming its salt or adduct and (ii) microcapsules formed were without any deleterious effect on A33. A systematic study was conducted by preparing microcapsules with different polyurea wall architectures. Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (H-1 NMR) spectroscopic analysis of extracted A33 from microcapsules do not show any structural changes during microencapsulation. A titration method was developed to analyze the amount of encapsulated A33 quantitatively. Polyurea microcapsules obtained from reaction of ethylene diamine (E) and isophorone diisocyanate (I) monomers have shown better properties such as encapsulation efficiency and extent of agglomeration. Significant reduction in the size was observed when microcapsules of EI wall material were prepared by homogenizing the initial emulsion of A33 in paraffin oil. The process described in this paper for the preparation of microcapsules is cost-effective and industrially viable, which can find applications in agrochemicals, coatings, self-healing composites, etc.1 aShukla, Parshuram, G.1 aJagtap, Siddheshwar, B.1 aBiradar, Satish, C.1 aCharpe, Vaibhav, P.1 aJadhav, Arun, S.  uhttps://library.ncl.res.in/content/preparation-and-characterization-microcapsules-containing-industrially-important-reactive01889nas a2200229   4500008004100000245010700041210006900148260000800217300001000225490000800235520107000243100002801313700002201341700002101363700001501384700002901399700002601428700002201454700002601476700003101502856012601533       2018                        eng d00a Functionalized carbon nanotube reinforced polymer nanocomposite microcapsules with enhanced stiffness0 aFunctionalized carbon nanotube reinforced polymer nanocomposite   cAUG  a82-890 v5503 aMicrocapsules with tunable mechanical properties are highly desirable in pressure sensitive applications. We report here a facile approach to prepare polyurea/multiwall carbon nanotube (MWCNTs) nanocomposite microcapsules (MICs) with enhanced stiffness. A model compound dimethyl phthalate (DMP) was used as core material. MWCNTs were modified with reactive functional groups namely carboxyl (-COOH), amines (-NH2), and isocyanates (-NCO) to ensure a stronger interface between polymer wall and MWCNTs. Functionalization of MWCNTs was corroborated by Fourier transformed infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) was employed to study the surface morphology of MICs. The presence of MWCNTs in the microcapsule wall was confirmed by transmission electron microscopy (TEM). MICs with functionalized MWCNTs show almost 100% increase in stiffness with respect to pristine capsules. All MICs show 92-97 +/- 1% encapsulation efficiency. The approach used in this paper can be broadly utilized to tune the mechanical properties of the microcapsules.1 aJagtap, Siddheshwar, B.1 aPatil, Vishal, D.1 aSuresh, Karthika1 aRam, Farsa1 aMohan, Muthu, Subramania1 aRajput, Shatruhan, S.1 aPatil, Shivprasad1 aShukla, Parshuram, G.1 aShanmuganathan, Kadhiravan  uhttps://library.ncl.res.in/content/functionalized-carbon-nanotube-reinforced-polymer-nanocomposite-microcapsules-enhanced02134nas a2200217   4500008004100000022001500041245012700056210006900183260000800252300001500260490000600275520133600281100002101617700002201638700002201660700002301682700002401705700002601729700003101755856013001786       2018                        eng d  a 2168-048500aTuning controlled release behavior of starch granules using nanofibrillated cellulose derived from waste sugarcane bagasse0 aTuning controlled release behavior of starch granules using nano  cJUL  a 9208-92170 v63 aControlled release formulations help to encapsulate agrochemicals and deliver at a sustained rate. Growing environmental challenges have increased the need for controlled release systems based on sustainable feed-stocks. To this end, we report here the preparation and properties of a monolith-type controlled release granular formulation based on two ubiquitous biopolymers, starch and cellulose. Cellulose nanofibers (CNFs) derived from waste sugarcane bagasse were mixed with gelatinized maize starch and urea formaldehyde to yield nanocomposite granular formulation. Dimethyl phthalate (DMP) was used as model encapsulant. The morphology of CNFs and CNFreinforced starch granules was characterized by transmission electron microscopy, scanning electron microscopy, BET porosimetry, and X-ray tomography. Incorporation of only 2-4 wt % CNFs led to a significant reduction in porosity as compared to that for neat starch granules, while the water uptake was enhanced by 20-30%. Reinforcing starch with CNFs led to a significant reduction in initial release rate and yet higher overall release of DMP, thereby allowing effective utilization of entrapped chemicals. This interesting release behavior could be attributed to two competing factors, water uptake-induced diffusion and barrier effects rendered by nanocellulose network.1 aPatil, Mayur, D.1 aPatil, Vishal, D.1 aSapre, Aditya, A.1 aAmbone, Tushar, S.1 aTorris, Arun, A. T.1 aShukla, Parshuram, G.1 aShanmuganathan, Kadhiravan  uhttps://library.ncl.res.in/content/tuning-controlled-release-behavior-starch-granules-using-nanofibrillated-cellulose-derived01840nas a2200277   4500008004100000022001400041245012000055210006900175260000900244300002600253490000800279520088000287653002401167653002301191653001801214653001801232653001701250653002301267100002201290700002001312700002201332700002201354700002601376700003101402856012901433       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  uhttps://library.ncl.res.in/content/sustained-release-insect-repellent-microcapsules-using-modified-cellulose-nanofibers-mcnf