| Radiation Synthesis of carbon/aluminum/silica Aerogel nanoporous structure derived from Polyacrylamide Hydrogel for high temperature applications |
| Paper ID : 1064-ICEE (R1) |
| Authors: |
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mohamed ghobashy *1, ghada Bassioni2, Ahmed A. Zaher3, Hamada Abd El-Wahab4, norhan nady5, Amira El-Sayed6, amr osman7, Nour el-din ahmed6 1Radiation Research of Polymer Chemistry Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), 2Ain Shams University, Faculty of Engineering, Cairo 11517, Egypt. 3Main Laboratories, Chemical Ware Fare, Egyptian Army, Egypt. 3Main Laboratories, Chemical Ware Fare, Egyptian Army, Egypt. 4Department of Chemistry Faculty of Science, Al-Azher University, P.O. Box 11754, Nasr City, Cairo, Egypt 5Polymeric Materials Research Department, City of Scientific Research and Technological Applications (SRTA-City), Borg El-Arab City, Alexandria 21934, Egypt. 6Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt. 7Department of Chemistry, Faculty of Science, Ain Shams University, Cairo, Egypt |
| Abstract: |
| Aerogel is a high-performance thermal resistance material and is desired for high temperature applications like dye-sensitized solar cells, batteries and fuel cells. To increase the energy efficiency of batteries aerogel is required to reduce the loss of energy arising from the exothermal reaction. In this paper, A different composition of inorganic-organic hybrid material was synthesized by growing silica aerogel inside polyacrylamide (PAAm) hydrogel. The hybrid PAAm/silica aerogel was synthesized using different irradiation doses of gamma rays (10 up to 60 kGy) and different solid contents of PAAm (6.25 ,9.37 ,12.5 and 30 wt%). Here, PAAm is used as an aerogel formation template and carbon precursor after the carbonization process at a temperature of (150, 350 and 1100 oC). The hybrid PAAm/silica aerogel was converted into Aluminum/Silicate aerogels after soaking in a solution of AlCl3 and then the carbonization process takes place at a temperature of (150, 350 and 1100 oC) for 2 h to provide C/Al/Si aerogels with density around 0.18–0.040 gm/cm3 and porosity of 84–95 %. The hybrid C/Al/Si aerogels presented interconnected networks of porous structures with different pores sizes depending on the carbon and PAAm contents. The sample with a solid content of 30% PAAm in C/Al/Si aerogels sample was composed of interconnected fibrils whose diameter was about 50 μm. The structure after carbonization at 350 oC and 1100 oC was a condensed opening porous 3D network structure. This sample gives the optimum thermal resistance and very low thermal conductivity of 0.073 (w/m•k), at low carbon content (2.71 % at temperature 1100 °C) and high vpore (95%) compared with carbon content 42.38 % and vpore (93%) give 0.102 (w/m•k). This is because at 1100 °C, the carbon atoms evolve leave an area between Al/Si aerogel particles and hence the pore size increase. |
| Keywords: |
| Gamma irradiation; Aerogel; Thermal conductivity; Carbon |
| Status : Paper Accepted |
