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 23.08.2011   Карта сайта     Language По-русски По-английски
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23.08.2011





Hydrogen storing and electrical properties of hyperbranched polymers-based nanoporous materials


Mona H. Abdel Rehima, Corresponding Author Contact Information, E-mail The Corresponding Author, Nahla Ismailb, Abd El-Rahman A.A. Badawyb and Gamal Turkyc





a Packing and Packaging Materials Department, Center of Excellence for advanced Science, Renewable Energy Group, National Research Center, Cairo, Egypt


b Physical Chemistry Department, Center of Excellence for advanced Science, Renewable Energy Group, National Research Center, Cairo, Egypt


c Microwave Physics and Dielectrics Department, National Research Center, Cairo, Egypt




Received 31 December 2010;


revised 30 May 2011;


accepted 13 June 2011.


Available online 29 June 2011.












Abstract



Hydrogen storage and electrical properties of different hyperbranched polymer systems beside a nanocomposite are studied. The polymers examined are aliphatic hyperbranched poly urea (P-Urea), polyamide amine (PAMAM) and polyamide amine/vanadium oxide (PAMAM/VOx) nanocomposite. At 80 K and up to 20 bar hydrogen pressure, the hydrogen storage capacity of hyperbranched P-Urea reached 1.6 wt%, 0.9 wt% in case of PAMAM and 0.6 wt% for VOx. The hydrogen storage capacity significantly enhanced when PAMAM and VOx form a nanocomposite and increased up to 2 wt%. At 298 K and up to 20 bar, all the samples did not show measurable hydrogen uptake. Electrical properties of the samples are also investigated; the measurements showed complete insulating behavior at hydrogenation measuring temperature. These investigations ensure that the polymer conductivity does not play a role in hydrogen uptake, also hyperbranched polymers are promising materials for hydrogen storage.












Highlights



• The hydrogen storage capacity of hyperbranched P-Urea, PAMAM and PAMAM and VOx is studied and electrical properties of the samples are also investigated; the measurements showed complete insulating behavior at hydrogenation measuring temperature. These investigations ensure that the polymer conductivity does not play a role in hydrogen uptake, also hyperbranched polymers are promising materials for hydrogen storage. • Electrical properties measurements for the samples showed complete insulating behavior at hydrogenation measuring temperature. • These investigations ensure that the polymer conductivity does not play a role in hydrogen uptake, also hyperbranched polymers are promising materials for hydrogen storage.





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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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