Showing papers by "Mohamed Mahmoud Nasef published in 2009"
TL;DR: In this paper, Nafion 117 membrane was investigated for removal of heavy metal ions such as Cu(II), Ni(II) and Co(I) from aqueous solutions.
87 citations
TL;DR: In this article, a single-step method for preparation of sulfonic acid proton exchange membranes (PVDF-g-PSSA) by grafting of sodium styrene sulfonate (SSS) onto electron beam irradiated poly(vinylidene fluoride) was studied.
50 citations
Journal Article•
29 citations
01 Jan 2009
TL;DR: In this paper, the effect of physical properties represented by viscosity and surface tension of liquid spreading on coated papers was investigated, and two substrates of different surface roughness were used to study the spreading behaviour of silicon oil and glycerine/water solutions in terms of contact angle, wetted drop base area and drop height as a function of time.
Abstract: The effect of physical properties represented by viscosity and surface tension of liquid spreading on coated papers was investigated. Two substrates of different surface roughness were used to study the spreading behaviour of silicon oil and glycerine/water solutions in terms of contact angle, wetted drop base area and drop height as a function of time. The liquid spreading on coated papers was found to vary depending on the liquid physical properties. Liquids with lower surface tension (silicon oil) and viscosity prevailed better wettability and vice versa. High surface roughness reduced the liquid spreading. Despite being traditionally used as a wetting indicator, contact angles were found to be insufficient to evaluate the spreading of liquids on these substrates. Hence, other parameters such as drop base area and drop height should also be considered.
20 citations
01 Dec 2009
TL;DR: In this article, the authors review the latest progress made in the development of various radiation-grafted proton conducting membranes (PCMs) for fuel cells and their expected future research directions are discussed.
Abstract: Radiation-induced graft copolymerization is an attractive technique to prepare alternative proton conducting membranes (PCMs) for fuel cell applications. The purpose of this chapter is to review the latest progress made in the development of various radiation-grafted PCMs for fuel cells. The challenges facing the development of these membranes and their expected future research directions are also discussed.
12 citations