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Effect of carbon nanotube dispersion and network formation on thermal conductivity of thermoplastic polyurethane/carbon nanotube nanocomposites
, Article Polymer Engineering and Science ; Volume 56, Issue 4 , 2016 , Pages 394-407 ; 00323888 (ISSN) ; Powell, T ; Solouki Bonab, V ; Manas Zloczower, I ; Sharif University of Technology
2016
Abstract
Carbon nanotubes (CNTs) were dispersed without any solvent in poly(tetramethylene ether glycol), (PTMEG) well above its melting point by ultrasonication in the pulse mode and different times. The polyol/CNT suspensions were used to prepare in situ polymerized thermoplastic polyurethane TPU/CNT nanocomposites with the CNT concentration of ∼ 0.05 vol%, much below the CNT geometrical percolation threshold calculated at 0.43 vol%. Results of rotational rheological measurements and ultraviolet-visible (UV-Vis) spectroscopy analysis revealed improvement in the nanoscale CNT dispersion with sonication time. Moreover, the optical microscopic images and sedimentation behavior for these samples...
Application of Advanced Oxidation Processes and Biological Methods to Degrade Levofloxacin
, M.Sc. Thesis Sharif University of Technology ; Yaghmaei, Soheila (Supervisor) ; Ghasemian, Saloumeh (Supervisor) ; Ghobadinejad, Zahra (Supervisor)
Abstract
Levofloxacin has been widely used in recent years as an antibiotic in the treatment of various bacterial infections. This drug compound is known as a newly emerging contaminant. In this study, the degradation of this pollutant has been investigated using advanced oxidation processes, biological process, and a combination of advanced oxidation-biological processes. In order to evaluate the degradation of levofloxacin with advanced oxidation processes, an electrochemical process was used. Advanced oxidation processes were carried out to optimize initial concentration parameters of the contaminant (5-15 milligrams per liter), electrolyte concentration (2.5-10 grams per liter), and current...