Polymeric nanofibers as a matrix for controlled release of pesticides has gained importance alongside controlled drug release. Electrospinning of thiram pesticide incorporated polycaprolactone micro and nanofibers and thereof release characteristics are reported. With only chloroform as the solvent for polycaprolactone, thiram incorporated microfibers could be electrospun. To electrospin polycaprolactone nanofibers containing thiram, methanol was added as a co-solvent. Regular and beadless microfibers (mean diameter = 3.7-4.5 μm) and nanofibers (mean diameter = 29-481 nm) were successfully electrospun. Fourier-transform infrared spectroscopy showed that thiram was held by the polycaprolactone matrix physically. X-ray diffraction analysis showed that thiram could not reorganize its crystals in the fibrous matrix. The amount of thiram pesticide loaded in micro and nanofibers was measured to be in the range of 42.5-150 and 26.4-163.4 mg.g À1 , respectively. Microfibers showed a higher release rate with lower amounts of the loaded thiram. Nanofibrous matrices showed an opposite trend.
The original version of this article unfortunately contained a mistake. The spelling of one of the author's name was incorrect. It should read as Mehdi Bazarganipour.
This study concerns the electrospinning of tragacanth nanofibers containing zinc oxide nanoparticles with the aim of separating sulfur compounds from crude oil. Zinc oxide incorporated tragacanth nanofibers were electrospun from tragacanth solutions containing zinc oxide nanoparticles with concentrations of 5, 10, 15, and 20 (% w/w). The average diameter of these nanofibers were 91.6, 94.1, 95.4, and 97.8 nm, respectively. SEM images showed that zinc oxide nanoparticles incorporated tragacanth nanofibers were uniformly electrospun with no beads. FTIR analysis showed some interactions between zinc oxide nanoparticles and tragacanth macromolecules.XRD studies showed a two phase microstructure consisting of semi-crystalline tragacanth matrix with zinc oxide crystallites dispersed in it. The highest filtration efficiency for 300 ml of Isfahan and Gachsaran crude oil was 75.3% and 62.2%, respectively. Moreover, the highest sulfur adsorption capacity obtained for Isfahan and Gachsaran crude oil was 211.20 mg g À1 and 108.19 mg g À1 , respectively.
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