01788nas a2200169   4500008004100000245008000041210006900121260000800190300001400198490000700212520121000219100002101429700002001450700001701470700001701487856011401504       2007                        eng d00aPET-SWNT nanocomposites through ultrasound assisted dissolution-evaporation0 aPETSWNT nanocomposites through ultrasound assisted dissolutionev  cJUN  a2279-22850 v433 a<p>Poly(ethylene terephthalate) (PET) based nanocomposites have been prepared with single walled carbon nanotubes (SWNTs) through an ultrasound assisted dissolution-evaporation method. Differential scanning calorimetry studies showed that SWNTs nucleate crystallization in PET at weight fractions as low as 0.3%, as the nanocomposite melt crystallized during cooling at temperature 24 degrees C higher than neat PET of identical molecular weight. Isothermal crystallization studies also revealed that SWNTs significantly accelerate the crystallization process. Mechanical properties of the PET-SWNT nanocomposites improved as compared to neat PET indicating the effective reinforcement provided by nanotubes in the polymer matrix. Electrical conductivity measurements on the nanocomposite films showed that SWNTs at concentrations exceeding 1 wt% in the PET matrix result in electrical percolation. Comparison of crystallization, conductivity and transmission electron microscopy studies revealed that ultrasound assisted dissolution-evaporation method enables more effective dispersion of SWNTs in the PET matrix as compared to the melt compounding method. (c) 2007 Elsevier Ltd. All rights reserved.</p>1 aAnoop, Anand, K.1 aAgarwal, U., S.1 aNisal, Anuya1 aJoseph, Rani  uhttp://library.ncl.res.in/content/pet-swnt-nanocomposites-through-ultrasound-assisted-dissolution-evaporation01999nas a2200301   4500008004100000022001400041245009700055210006900152260000900221300000900230490000800239520101400247653001501261653004401276653000701320653001701327653003501344653001701379100001701396700001701413700002601430700002201456700002101478700003501499700001701534700002101551856012501572       2018                        eng d  a0254-058400apH dependent sophorolipid assemblies and their influence on gelation of silk fibroin protein0 apH dependent sophorolipid assemblies and their influence on gela  cJAN   a9-160 v2033 a<p>Sophorolipid (SL), a bio-derived surfactant is an excellent gelling agent for natural fibrous protein, silk fibroin (SF) leading to potential biomedical applications. Interaction of SF with SL has been shown to accelerate the formation of hydrogel with the rate being dependent on the form of SL used. Here, we examine the effect of pH on SL-SF interaction and gel formation by employing rheology, fluorescence spectroscopy, SANS and NMR. The results indicate that the size of SL assemblies decrease as pH increases from acidic to alkaline and significantly impacts the association of SL and SF. The association of SF and SL is mainly via hydrophobic interactions, with the SL molecules forming bead like structures along the SF chain. The increased charge on the acidic form of SL at higher pH results in greater repulsion between acidic SL molecules, which are bound to the hydrophobic sites of SF, leading to rapid chain unfolding and subsequent gelation. (C) 2017 Elsevier B.V. All rights reserved.</p>10aAssemblies10aNuclear magnetic resonance spectroscopy10apH10aSilk fibroin10aSmall angle neutron scattering10aSophorolipid1 aDubey, Parul1 aKumar, Sugam1 aRavindranathan, Sapna1 aVasudevan, Sahana1 aAswal, Vinod, K.1 aRajamohanan, Pattuparambil, R.1 aNisal, Anuya1 aPrabhune, Asmita  uhttp://library.ncl.res.in/content/ph-dependent-sophorolipid-assemblies-and-their-influence-gelation-silk-fibroin-protein