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ISSN (Online): 2372-3122

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Article

Microwave Assisted Synthesis of Sn Promoted Pt Catalysts and Their Ethanol Electro-oxidation Activities

1Chemical Engineering Department, Yüzüncü Yıl University, Van, Turkey

2Department of Chemistry, Yüzüncü Yıl University, Van, Turkey


American Journal of Nanomaterials. 2016, 4(1), 8-11
doi: 10.12691/ajn-4-1-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Dilan Atbas, Aykut Çağlar, Hilal Kivrak, Arif Kivrak. Microwave Assisted Synthesis of Sn Promoted Pt Catalysts and Their Ethanol Electro-oxidation Activities. American Journal of Nanomaterials. 2016; 4(1):8-11. doi: 10.12691/ajn-4-1-2.

Correspondence to: Hilal  Kivrak, Chemical Engineering Department, Yüzüncü Yıl University, Van, Turkey. Email: hilalkivrak@gmail.com, hilalkivrak@yyu.edu.tr

Abstract

In the present work, bi-metallic Pt-Sn electro catalysts were prepared by microwave assisted polyol method at 9:1, 7:3, and 5:5 Pt: Sn atomic ratios on carbon nanotube. The ethanol electro-oxidation activities of these catalysts were measured by cyclic voltammetry (CV). The effect of Sn addition to Pt for the improvement of ethanol electro-oxidation was also measured by CV measurements. Pt-Sn (07:03) catalyst exhibits the highest ethanol electro-oxidation activity. Furthermore, the rotating disk measurements were performed at 0-2000 rpm rotating rates on Pt-Sn (07:03) catalyst. The effect of ethanol concentration on ethanol electro-oxidation activity at varying ethanol concentrations (0.03 M-8.00 M) were measured on Pt-Sn (07:03) catalyst. CO stripping measurements were performed to determine the CO resistance of Pt-Sn electrocatalysts. As a result, CO oxidation onset potential decreases by the addition of Sn to Pt, revealing that Sn addition promotes the CO resistance of platinum.

Keywords

References

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Article

Time-dependent Toxic Effect and Distribution of Silver Nanoparticles Compared to Silver Nitrate after Intratracheal Instillation in Rats

1Cellular Functional Nanobiomaterials Group, Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, Japan

2Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt

3Department of Pathology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt

4Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, Japan


American Journal of Nanomaterials. 2016, 4(1), 12-19
doi: 10.12691/ajn-4-1-3
Copyright © 2016 Science and Education Publishing

Cite this paper:
Alaa Fehaid, Mohamed F. Hamed, Mamdouh M. Abouelmagd, Akiyoshi Taniguchi. Time-dependent Toxic Effect and Distribution of Silver Nanoparticles Compared to Silver Nitrate after Intratracheal Instillation in Rats. American Journal of Nanomaterials. 2016; 4(1):12-19. doi: 10.12691/ajn-4-1-3.

Correspondence to: Akiyoshi  Taniguchi, Cellular Functional Nanobiomaterials Group, Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, Japan. Email: taniguchi.akiyoshi@nims.go.jp

Abstract

Silver nanoparticles (AgNPs) are widely used because of their anti-bacterial and anti-inflammatory properties; however, the adverse health effects of these nanoparticles, especially to the lungs, have been less studied. We thus investigated the inflammatory response of polyvinylpyrrolidone (PVP)-coated AgNPs and silver nitrate (AgNO3) after 24 h, 14 days and 28 days of single intratracheal instillation in rats. The bronchoalveolar lavage fluid (BALF) samples were collected and analyzed; a significant influx of neutrophils into the lung was found in both treated groups after 24 h with a presence of AgNPs in the alveolar macrophages after 24 h, 14 days and 28 days of instillation. Pro-inflammatory cytokines and enzymatic activities showed a significant increase after 24 h in both treated groups with a higher significance in the AgNO3-treated group than the AgNPs-treated group. After 28 days, these increases were completely recovered in the AgNO3-treated group but were still present in the AgNPs-treated group. The gross examination of lung tissues revealed a clear focal inflammation in the AgNPs-treated group after 28 days. More than 29% and 9% of the initial dose of AgNPs were recovered in lung tissues after 1 day and 28 days, respectively. Comparatively, the AgNO3-treated group recovered only 16.5% and 1%, suggesting that the silver ions are easily absorbed into the circulation and distributed to different tissues more than the nanoparticles. Our results indicated that the PVP-AgNPs caused a subchronic pulmonary inflammation compared to the acute one induced by the ionic form, which can be recovered easily.

Keywords

References

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Article

Morphological, Structural and Optical Properties of W Doped-ZnO Films Grown by Pulsed Laser Deposition onto Different Glass Substrates

1Laboratoire de Photonique et de Nano-Fabrication, Groupe de physique du Solide et Sciences des Matériaux, Faculté des sciences et Techniques Université Cheikh Anta Diop de Dakar (UCAD), B.P. 25114 Dakar-Fann Dakar (Senegal)


American Journal of Nanomaterials. 2016, 4(1), 20-26
doi: 10.12691/ajn-4-1-4
Copyright © 2016 Science and Education Publishing

Cite this paper:
A.O. Kane, C. B. Ndao, E. H. O. Gueye, M. B. Gaye, N. M. Ndiaye, I. Ngom, B. D. Ngom, P. D. Tall, A.C. Beye. Morphological, Structural and Optical Properties of W Doped-ZnO Films Grown by Pulsed Laser Deposition onto Different Glass Substrates. American Journal of Nanomaterials. 2016; 4(1):20-26. doi: 10.12691/ajn-4-1-4.

Correspondence to: B.  D. Ngom, Laboratoire de Photonique et de Nano-Fabrication, Groupe de physique du Solide et Sciences des Matériaux, Faculté des sciences et Techniques Université Cheikh Anta Diop de Dakar (UCAD), B.P. 25114 Dakar-Fann Dakar (Senegal). Email: bdngom@gmail.com

Abstract

Tungsten-doped zinc oxide thin films were prepared by ablating a target containing 1 wt% WO3 with XeCl excimer laser (λ=3O8 nm). The films were grown onto different glass substrate at a repetition rate of 10Hz, pulse energy of 100 mJ and irradiation time of 20 min. The structural and optical properties of the films are found to be strongly dependent on the nature of the substrate. The X-ray Diffraction (XRD) results show that all the films are preferentially C-axis oriented. The room temperature photoluminescence (PL) spectrum shows a dominant near-band-edge emission peak for the film deposited on borosilicate and GGG substrate. The average transmittance was found to be in the range of 84-90%. The absorption coefficient exhibits a direct bandgap feature with some band tailing effects.

Keywords

References

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[4]  B. D. Ngom, O. Sakho , N. Manyala, J.B. Kana, N. Mlunguisi, L. Gerbous, A.Y. Fasasi, M. Maaza, A.C. Beye, Applied Surface Science, 255, 7314-7318 (2009).
 
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