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Enhancement of electric properties of polypyrrole by copper electrodeposition

13-Mar-2015 | Chikouche Imene, Sahari Ali, Zouaoui Ahmed, Tingry Sophie, The Canadian Journal of Chemical Engineering, 2015

Abstract Polypyrrole films (2–3.5 µm thick) were electrosynthetized in organic media by potentiodynamic electropolymerization on silicon surfaces. To improve the electronic conductivity of the polypyrrole films, elemental copper was electrodeposited directly on the film surface by simple ...

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Stability of Three‐Phase Water‐Particle‐Oil Systems

10-Mar-2015 | Izabela Polowczyk, Anna Bastrzyk, Tomasz Koźlecki, Zygmunt Sadowski, Chemical Engineering & Technology, 2015

Abstract The stability of three‐phase systems consisting of oil and a solid phase dispersed in aqueous solutions is examined. To achieve a sufficiently hydrophobic surface of the solid particles, the surface of glass microspheres was modified with ionic surfactants. The destabilization ...

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LTA/Poly(1‐trimethylsilyl‐1‐propyne) Mixed‐Matrix Membranes for High‐Temperature CO2/N2 Separation

04-Mar-2015 | Ana Fernández‐Barquín, Clara Casado‐Coterillo, Miguel Palomino, Susana Valencia, Angel Irabien, Chemical Engineering & Technology, 2015

Abstract Mixed‐matrix membranes (MMM) consisting of poly(1‐trimethylsilyl‐1‐propyne) (PTMSP) as continuous matrix and small‐pore LTA‐framework zeolites with Si/Al ratios from 1 (commercial zeolite A) to ∞ (ITQ‐29) as dispersed phase were prepared by solution casting. The thermal stability of ...

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Robust Multiobjective Optimization Applied to Optimal Control Problems Using Differential Evolution

04-Mar-2015 | Davi L. Souza, Fran S. Lobato, Rubens Gedraite, Chemical Engineering & Technology, 2015

Abstract Robust optimization is an approach for modeling optimization problems under uncertainty where the modeler aims at finding decisions that are optimal for the worst‐case realization of the uncertainties within a given set of values. Typically, the original uncertain optimization problem ...

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Effect of fluid velocity on radioactive ion retention by fluidized bed reactor

21-Feb-2015 | Mohamed Abdelaziz, Azza H. Ali, Hesham F. Elbakhshawangy, Sameh H. Othman, The Canadian Journal of Chemical Engineering, 2015

This study is concerned with the design, construction, simulation, and pre‐operation of a fluidized bed reactor for low level radioactive waste treatment by a new chelating resin. In this respect a new mathematical model is suggested to account for the effect of fluid velocity and to determine ...

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Heat Transfer Phenomena of Power Law Fluids in Double‐Pass Heat Exchangers with Isoflux Conditions

18-Dec-2014 | Chii‐Dong Ho, Gwo‐Geng Lin, Thiam Leng Chew, Wei‐Hao Lan, Cheng‐Yi Lin, Chemical Engineering & Technology, 2014

Abstract A new design of conjugated heat transfer in double‐pass parallel‐plate laminar countercurrent operations of power law fluids under wall isoflux was investigated experimentally and theoretically. The analytical solutions were obtained with a superposition model by introducing an ...

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Analytical solution of turbulent pipe flow according to second‐gradient theory

17-Dec-2014 | H. Biglarian, H. Beyrami, Q. Dorosti, A. Sattari, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT This paper presents a gradient theory of grade two based on an axiomatic conception of a nonlocal continuum theory for materials of grade n. The general classical model of linear momentum equation that is depending on the second‐order strain rate tensor and its gradients up to grade ...

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Novel temperature‐sensitive and pH‐sensitive polyurethane membranes: preparation and characterization

10-Dec-2014 | Hu Zhou, Bin Yu, Ruiping Xun, Ning Li, Kejian Wu, Hanzhou Sun, Zhihua Zhou, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT The polyurethane (PU) membranes with temperature and pH double sensitivities for water permeation were designed and prepared from a two‐step solution polymerization from the crystalline polycaprolactone diols (PCL), 4,4′‐diphenylmethane diisocyanate (MDI) and pH‐sensitive ...

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An analytical study of the acoustic force implication on the settling velocity of non‐spherical particles in the incompressible Newtonian fluid

10-Dec-2014 | A. R. Noorpoor, S. Nazari, Asia-Pacific Journal of Chemical Engineering, 2014

ABSTRACT In this paper, the effect of the acoustic radiation force on the acceleration motion of a vertically falling non‐spherical particle in the incompressible Newtonian fluid is investigated. The using of the acoustic radiation force for increasing the falling velocity of particles ...

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Improved performance of A passive air breathing flat‐plate microbial fuel cell

04-Dec-2014 | Sona Kazemi, Khalid Fatih, Madjid Mohseni, The Canadian Journal of Chemical Engineering, 2014

This study aims to investigate the effect of the graphite felt (GF) substrate surface treatment, the GF active surface area, and the anode chamber depth on the performance of the passive air breathing flat‐plate microbial fuel cell (FPMFC) configuration. Three passive air breathing FPMFCs ...

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