نتایج جستجو برای: Nafion

تعداد نتایج: 1409  

This paper presents the results of mechanical strength of wet and dry zirconia/ Nafion® nano-composite membrane. The tensile tests were conducted to determine elastic modulus and stiffness of dry and wet pristine Nafion® membrane and modified Nafion® membrane. The composite membranes were prepared by recast method of different synthesized zirconium oxide with the zirconia content of 10% by weig...

Journal: :transport phenomena in nano and micro scales 0
h. hassanzadeh afrouzi department of mechanical engineering, babol noshirvani university of technology, babol, i. r.iran a. moshfegh school of aerospace, mechanical, and mechatronic eng., the university of sydney, nsw 2006, australia m. farhadi department of mechanical engineering, babol noshirvani university of technology, babol, i. r.iran k. sedighi department of mechanical engineering, babol noshirvani university of technology, babol, i. r.iran

the microphase separation of hydrated perfluorinated sulfonic acid membrane nafion was investigated using dissipative particle dynamics (dpd). the nafion as a polymer was modelled by connecting coarse grained beads which corresponds to the hydrophobic backbone of polytetrafluoroethylene and perfluorinated side chains terminated by hydrophilic end particles of sulfonic acid groups [1, 2]. each f...

A. Moshfegh H. Hassanzadeh Afrouzi K. Sedighi M. Farhadi

The microphase separation of hydrated perfluorinated sulfonic acid membrane Nafion was investigated using Dissipative Particle Dynamics (DPD). The nafion as a polymer was modelled by connecting coarse grained beads which corresponds to the hydrophobic backbone of polytetrafluoroethylene and perfluorinated side chains terminated by hydrophilic end particles of sulfonic acid groups [1, 2]. Each f...

2006
M. BARCLAY SATTERFIELD PAULW. MAJSZTRIK HITOSHI OTA JAY B. BENZIGER ANDREW B. BOCARSLY

Measurements of the mechanical and electrical properties of Nafion and Nafion/titania composite membranes in constrained environments are reported. The elastic and plastic deformation of Nafion-based materials decreases with both the temperature and water content. Nafion/titania composites have slightly higher elastic moduli. The composite membranes exhibit less strain hardening than Nafion. Co...

2015
Ji Sun Choi Joon-Yong Sohn Junhwa Shin Vladimir Gurau

The purpose of this study was to investigate the influence of electron beam (EB) irradiation on the structure and physical properties of Nafion 117 membranes (in both acid and sodium forms) when they are irradiated in water and isopropanol as solvents. The mechanical properties of Nafion membranes in acid form irradiated in water were found to rapidly deteriorate as the irradiation dose was inc...

Journal: :Nano letters 2005
Daniel J Gargas David A Bussian Steven K Buratto

A method of determining the connectivity of ion-conducting hydrophilic channels within the Nafion polymer electrolyte membrane by way of pore-directed nanolithography has been developed. Electrochemical etching of a silicon surface is performed through a Nafion-membrane mask. The resulting silicon surface imaged by tapping-mode atomic force microscopy (TMAFM) provides a footprint of the hydroph...

2008
Paisan Kongkachuichay

─The Nafion/zeolite composite membranes were synthesized for polymer electrolyte fuel cells (PEMFCs) by adding zeolite in the matrix of Nafion polymer. Two kinds of zeolites, Analcime and Faujasite, were used. The physicochemical properties of the composite membranes such as water uptake, ion-exchange capacity, hydrogen permeability, and proton conductivity were determined. The fabricated compo...

2004
Chris Yang S. Srinivasan S. Tulyani

The physiochemical properties of Nafion 115 and a composite Nafion 115/zirconium phosphate (∼25 wt.%) membranes are compared. The composite membrane takes up more water than Nafion at the same water activity. However, the proton conductivity of the composite membrane is slightly less than that for Nafion 115. Small angle X-ray scattering shows that the hydrophilic phase domains in the composite...

Journal: :iranian journal of pharmaceutical sciences 0
ali akbar saboury institute of biochemistry and biophysics, tehran university, tehran, iran saeed rezaei-zarchi institute of biochemistry and biophysics, tehran university, tehran, iran department of biology, payam-e-noor university, yazd, iran aisha javed department of biochemistry, university of agriculture, faisalabad, pakistan isatis biotechnology company, yazd science and technology park, yazd, iran

nafion is a perfluorinated anionic polyelectrolyte. the increasing popularity of nafion for the fabrication of redox polymer modified electrodes in recent years arises from easy fabrication, good electrical conductivity and high partition coefficients of many redox compounds in nafion. to investigate the production of nano-compositions by mixing electron transfer material and nafion polymer for...

A novel Nafion®-based nanocomposite membrane was synthesized to be applied as direct methanol fuel cells (DMFCs). Carbon nanotubes (CNTs) were coated with a layer of silica and then reacted by chlorosulfonic acid to produce sulfonate-functionalized silicon dioxide coated carbon nanotubes (CNT@SiO2-SO3H). The functionalized CNTs were then introduced to Nafion®, and subsequently, methanol permeab...

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