Third Day Poster Session, 17 June 2010 - NanoTR-VI

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Poster Session, Thursday, June 17 Theme F686 - N1123 Hydrogen Chemisorption on Metal Loaded Carbon Nanotubes Gülah Ozan 1* , Saadet Kayıran Beyaz 2 , Nalan Tekin 2 , M. Efkan Kibar 3 1 Gebze Institute of Technology, Department of Chemistry, 41400 Gebze / Kocaeli-TURKEY. 2 Kocaeli University, Faculty of Science and Arts, Department of Chemistry, 41380 Izmit / Kocaeli- TURKEY. 3 Kocaeli University, Faculty of Engineering, Department of Chemical Engineering, 41380 Izmit / Kocaeli- TURKEY. Abstract— Metal doped or metal decorated carbon nanotubes (CNTs) are the most capable materials for hydrogen storage by chemisorption. Using CNTs for hydrogen storage has been one of the hottest topics in science and technology. We have developed nickel doped materials by wet chemistry method and measured the hydrogen absorption capacity of these materials. The comparison of absorption capacities between materials is discussed in the light of characterization results. Hydrogen storage is an essential prerequisite for the widespread deployment of fuel cells, particularly in transport. The US Department of Energy (DOE) has announced a 6.0 wt% target for hydrogen storage on-board automobiles [1, 2]. Sorption in solids is one of the way for increasing hydrogen storage. Nanostructured carbons are being investigated as potential hydrogen adsorbents since they are cheap, light and porous materials. CNTs can easily and dependably accept and release substantial quantities of hydrogen by physisorption and chemisorption mechanisms [3]. Many works are devoted to measure and calculate hydrogen adsorption capacity of carbon nanomaterials. According to the works done by Monte Carlo simulations, it is observed that hydrogen storage is less than 1% at room temperature when it is absorbed with various carbon materials such as SWCNTs, MWCNTs, and GNFs. These works show that the physisorption is not sufficent for store the quantity of hydrogen given in DOE target [4-6]. For this reason the researchers have tried to create more attractive nanocarbons surface for creating strong interaction with hydrogen. The chemisorption mechanism could provide the hydrogen storage capacity which can fulfill the technological necessity [3]. The aim of this work is to study the hydrogen chemisorption on Ni doped materials. In this study, three different Ni doped materials were prepared using active carbon (AC), Al 2 O 3 and multi walled carbon nanotubes (MWCNTs). MWCNTs were synthesized by Chemical Vapor Deposition (CVD) method using acetylene as a carbon source and nickel as catalyst. MWCNTs were purified by thermal oxidation in air at temperature at 350 ºC for 2h in order to remove amorphous carbon and were treated with 3M HCl solution in order to remove metal catalyst. Carboxylic acid functionalized MWCNTs (f-MWCNTs) have been obtained by treatment of concentrated H 2 SO 4 /HNO 3 (v:v, 3:1). 15 % Ni doped f-MWNTs, Al 2 O 3 and AC were prepared from Ni(NO 3 ) 2 .6H 2 O by wet chemistry method. Formerly, f- MWNT, Al 2 O 3 and A.C. was ultrasonically dispersed in ethanol for 3h and Ni(NO 3 ) 2 .6H 2 O solution was added and ultrasonicated in order to obtain homogenous metal dispersion on these materials. Ni doped materials were centrifuged and dried at 60 ºC for 4 days in vacuum oven. The synthesized MWCNTs, f-MWCNTs were characterized by TEM, SEM, FT-IR, EDX, Raman, and BET techniques. The specific surface area of the 15% Ni doped materials are 222 m2/g for f- MWCNTs, 114m2/g for Al 2 O 3 and 362m2/g for AC. The hydrogen chemisorptions capacity of obtained Ni doped materials was measured using Micromeritics, ASAP 2020, Surface Area and Porosity Analyzer. Figure clearly shows that MWCNTs were successfully synthesized and doped with Ni metal atoms. a c Figure: (a) HRTEM image of MWCNTs, (b) Raman Spectrum of MWCNTs, (c) SEM image of 15 % Ni doped f-MWCNT and (d) EDX result of 15 % Ni doped f-MWCNT In summary, we have successfully developed nickel doped materials and measured the hydrogen absorption capacity of these materials. The comparison of absorption capacities between Ni doped materials are discussed in light of characterization results. The absorption results will be presented during the conference. This work was partially supported by TUBITAK under Grant No. 106T502, 109T619 and by Kocaeli University under Grant No. BAP 2007/70. BET characterization and H 2 chemisorption studies were done at AYARGEB at Kocaeli University Teknopark Inc. *Corresponding Author: gozan@gyte.edu.tr [1] A. Anson, M. Benham, J. Jagiello, M. A. Callejas, A. M. Benito, Nanotechnology, 15 (2004) 1503-08. [2] B. Weinberger, F. D. Lamari, Int J Hydrogen Energy, 34 (2009) 3058-64. [3]. Y.Yürüm, A. Taralp, T.N., Vezirolu, Int J Hydrogen Energy, 34 3784-98 (2009). [4] S. K. Beyaz, F. L. Darkrim, B. P. Weinberger, P. Gadelle, L. Firlej and P. Bernier, Int. J. Hydrogen Energy, 34 (2009) 1965-70. [5] S.B. Kayıran, F.D. Lamari, D. Levesque, Journal Of Physical Chemistry B, 108 / 39 (2004) 15211-15. [6] D. Levesque, A. Gicquel, F.L. Darkrim , S.B. Kayıran, Journal Of Physics-Condensed Matter, 14 / 40 (2002) 9285-93. b d 6th Nanoscience and Nanotechnology Conference, zmir, 2010 767
Poster Session, Thursday, June 17 Theme F686 - N1123 Biosynthesis of metal nanoparticles using Entrobacteriaceae Eshrat Gharaei-Fathabad 1 , Soheyla Honary 2 , Masoumeh Eslamifar 3 , Zahra Khorshidi 1 1- Department of Biotechnology, Sari Faculty of Pharmacy, Mazandaran University of Medical Sciences 2- Department of Pharmaceutics, Sari Faculty of Pharmacy, Mazandaran University of Medical Sciences 3- Department of Microbiology, Faculty of Hygiene, Mazandaran University of Medical Sciences Abstract: Many biotechnological applications such as remediation of toxic metals employ micro-organisms such as bacteria and the detoxification often occurring via reduction of the metal ions. The main objectives of the present study were to investigate the biosynthesis of zerovalent metal nanoparticles in the supernatant of the Entrobacteriaceae medium of cultures. Ten different pure colonies of Entrobacteriaceae isolated from waste water, were cultured in Luria Bertani broth medium .After reaching to the exponential growth, the supernatant were examined for the ability to produce metal nanoparticles. For that, 1 Molar solution of CuSo4, AgNo3 and FeSo4 added to the reaction matrix. The reaction was done in a dark and anaerobic environment at 37 ° C. After 2 days, it was observed that the color of the solutions in flasks turned. The nanoparticles were examined using UV-Visible Spectroscopy, Transmission Electron Microscopy (TEM) analyses and Zeta potentials. It was found that exposure of culture supernatanant of some Entrobacteriaceae mainly E.coli, to these metal ions lead to the formation of metal nanoparticles. The silver, copper and iron nanoparticles were in the range of 20-80, 90-110 and 5-60 nm in dimension respectively. The main conclusion is that the bio-reduction method is a good alternative to the electrochemical methods for producing nanoparticles. Keywords: bio-reduction, E coli. Entrobacteriaceae, metal nanoparticles 6th Nanoscience and Nanotechnology Conference, İzmir, 2010 767-1
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