Search

• Influences of NaCl, curcumin and lavender oil on tween 80 micelles are studied. • Water structure making salt NaCl induces sphere-to-rod growth of tween 80 micelles. • Micellar solubilization of phytochemicals helps in tuning such growth behavior. • System with 2% lavender oil thus exhibit micelle-to-vesicle structural transition. • The results are explained based on influence of the additives on CPP of the micelles. Polysorbate 80 is one of the most widely used solubilizing agents in food, cosmetic and pharmaceutical industries. Influences of different classes of solubilizates and additives on its self-assembly characteristics are however, not sufficiently understood yet. In this manuscript, we show how common water structure making salt NaCl, and lipophilic phytochemicals like curcumin and lavender oil help in modulating the structure of Polysorbate 80 micelles in aqueous medium. Our DLS, SANS and rheological studies show that NaCl induces sphere-to-rod growth of polysorbate 80 micelles at the room temperature. Micellar solubilizations of the phytochemicals, which were found to be facilitated with increase in temperature, induce only a marginal growth of the micelles up to the highest level of solubilization. Their presence however, helps in modulating the NaCl induced micellar growth behavior in the tween 80 solutions leading to observation of micelle-to-vesicle structural transition at 2% lavender oil concentration. The phytochemical solubilized micellar solutions could be converted to alginate based hydrogel beads and patches that can freely release micellar phytochemical in aqueous medium. Our results shed light on possible ways of modulating the solubilization behavior, self-assembly characteristics and rheological properties of aqueous system of polysorbate 80, which could be important for their applications. [ABSTRACT FROM AUTHOR]

Abstract: Infantile hepatic hamangioendothelioma type II is similar to angiosarcoma in terms of histomorphology and behavior. Various presentations of this lesion have been reported in the literature, e.g. cases with a hepatic mass, cutaneous hemangiomas, heart failure, etc. We report on a patient, male/2 years, who had two jejunal masses and a hepatic mass accompanied by lower GI bleeding and intestinal obstruction. The two jejunal masses and the hepatic lesion were diagnosed as angiosarcoma histomorphologically (IHHE type II), and were positive for vascular markers (CD31 and CD34) on immunohistochemistry. The patient had no skin lesions. We report this case and provide a literature review because of the unusual presentation and the overall rarity of this entity. [Copyright &y& Elsevier]

The structural, magnetic and electrical properties of the hole doped cobaltites, with compositions (La1−xRx)0.7Ba0.3CoO3 (0.0≤x≤1.0; R=Pr, Nd), have been studied. Substitutions of Pr and Nd for La destabilize the stoichiometric perovskite structure at the benefit of the ordered oxygen deficient perovskite ‘112’-type structure, due to decrease in size of the rare earth ion. Our studies show that for our synthesis condition, the samples of nominal compositions, R1−yBayCoO3 (R=Pr, Nd), can form with the perovskite structure only for y<0.3. In the single-phase regions, the thermo-magnetic irreversibility and coercive field increase with the substitution of Pr and Nd for La. The low temperature resistivity minimum and negative magneto-resistance in the insulating regions of these polycrystalline compounds have been ascribed to grain boundary effects. [Copyright &y& Elsevier]

Abstract: An experimental study has been conducted in axisymmetric, co-flowing triple flames with different equivalence ratios of the inner and outer reactant streams ( and ). Different fuel combinations, like propane/propane, propane/methane or methane/methane in the inner and outer streams respectively, have been used in the experiments. The structures of the triple flames have been compared for the different fuel combinations and equivalence ratios. The conditions under which triple flames exhibit oscillation have been identified. During the oscillation, the non-premixed flame and the outer lean premixed flame flicker strongly, while the inner rich premixed flame remains more or less stable. The flickering frequency has been evaluated through image processing and fast Fourier transform (FFT) of the average pixel intensity of the image frames. It is observed that, for all the fuel combinations, the frequency decreases with the increase in the outer equivalence ratio, while it is relatively invariant with the change in the inner equivalence ratio. However, an increase in the inner equivalence ratio affects the structure of the flame by increasing the heights of the inner premixed flame and non-premixed flame and also enlarges the yellow soot-laden zone at the tip of the inner flame. A scaling analysis of the oscillating flames has been performed based on the measured parameters, which show a variation of Strouhal number (St) with Richardson number (Ri) as St ∝ Ri 0.5. The fuel type is found to have no influence on this correlation. [Copyright &y& Elsevier]

Abstract: Nanocrystalline Mn3O4 has been synthesized by ultrasonic irradiation of Mn acetate solution in water. Analysis of its X-ray diffraction data shows formation of a phase-pure compound with an average particle size of about 15nm. DC magnetization measurements as a function of temperature and field show a reduced ferrimagnetic transition temperature as compared to those reported for the bulk , and a subsequent observation of superparamagnetic behavior at 40K. The observed magnetic properties are suggestive of formation of a single domain magnetically ordered Mn3O4 nanoparticles below their ferrimagnetic transition temperature. [Copyright &y& Elsevier]

We have investigated the effects of 24.3 at% Dy substitution on the La site in the ferromagnetic perovskite La0.7Ca0.3MnO3. Results show a randomly canted ferromagnetic state below 65 K with a reduced metal–insulator transition. There is no breakdown of ferromagnetic domain structure at T<65 K (covering the temperature range below 35 K where resistivity shows an upturn, indicating a reentrant transition to an insulating behaviour). Reduced geometrical tolerance factor and increased variance of the La-site ionic radius are responsible for the observed changes. [Copyright &y& Elsevier]

Inter and intragranular pinning potentials of 116 MeV oxygen ion irradiated textured polycrystalline Bi2Sr2CaCu2O8+δ (Bi-2212) and Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10+δ (Bi-2223) have been studied from dc magnetization at low (50 Oe) and high (10,000 Oe) fields respectively. There is an increase in intergranular pinning potential (U0) in Bi-2223 in contrast to anomalous decreases in Bi-2212 with increasing dislocation density. Intragranular pinning potential is governed by the concentration of vacancy type defects rather than its size as observed in proton irradiation. Pinning has been explained in the light of statistical dilute pinning model. [Copyright &y& Elsevier]