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16 results on '"Da'as, Eman Husni"'

11. Changes in Microstructure of Ni–Co Dispersed Samaria-Doped Ceria Hydrogen Electrodes for the Improved Durability via Reversible Cycling Operation of Solid Oxide Cells

Author

Da’as, Eman Husni, Nishino, Hanako, and Uchida, Hiroyuki

Abstract

We have quantitatively analyzed changes in the microstructure of double-layer hydrogen electrodes for solid oxide cells (SOCs), which consist of porous samaria-doped ceria (SDC) with highly dispersed Ni−Co nanoparticles as the catalyst layer (CL) and a thin current collecting layer of Ni‒YSZ cermet, whose durability we recently found to undergo a remarkable improvement via reversible cycling operation between steam electrolysis and fuel cell-modes. It was demonstrated by focused ion beam-scanning electron microscopy (FIB-SEM) that the Ni content in the CL was nearly fully maintained by the cycling operation, compared with a significant decrease in Ni after the electrolysis single-mode operation. The lower parts of many Ni‒Co particles were observed to be anchored tightly on the SDC support after the cycling operation, probably due to a strong interaction between Ni‒Co and SDC. Such a stabilization of the microstructure is proposed to contribute to the improved durability.

Published
2023
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13. In Situ Synthesis of Self-Assembled Gold Nanoparticles on Glass or Silicon Substrates through Reactive Inkjet Printing.

Author

Abulikemu, Mutalifu, Da'as, Eman Husni, Haverinen, Hanna, Cha, Dongkyu, Malik, Mohammad Azad, and Jabbour, Ghassan Elie

Subjects
*NANOPARTICLES, *X-ray spectroscopy, *SPECTRUM analysis, *REDSHIFT, *DOPPLER effect
Abstract

A facile and low cost method for the synthesis of self-assembled nanoparticles (NPs) with minimal size variation and chemical waste by using reactive inkjet printing was developed. Gold NPs with diameters as small as (8±2) nm can be made at low temperature (120 °C). The size of the resulting NPs can be readily controlled through the concentration of the gold precursor and oleylamine ink. The pure gold composition of the synthesized NPs was confirmed by energy-dispersive X-ray spectroscopy (EDXS) analysis. High-resolution SEM (HRSEM) and TEM (HRTEM), and X-ray diffraction revealed their size and face-centered cubic (fcc) crystal structure, respectively. Owing to the high density of the NP film, UV/Vis spectroscopy showed a red shift in the intrinsic plasmonic resonance peak. We envision the extension of this approach to the synthesis of other nanomaterials and the production of tailored functional nanomaterials and devices. [ABSTRACT FROM AUTHOR]

Published
2014
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14. Inside Back Cover: In Situ Synthesis of Self-Assembled Gold Nanoparticles on Glass or Silicon Substrates through Reactive Inkjet Printing (Angew. Chem. Int. Ed. 2/2014).

Author

Abulikemu, Mutalifu, Da'as, Eman Husni, Haverinen, Hanna, Cha, Dongkyu, Malik, Mohammad Azad, and Jabbour, Ghassan Elie

Subjects
*GOLD nanoparticles, *SILICON
Abstract

The in situ synthesis of gold nanoparticles directly over a substrate surface by using inkjet printing is reported by G. E. Jabbour et al. in their Communication on page 420 ff. This approach is anticipated also to enable the preparation of other nanoparticles with various functionalities. The image shows the sequential printing of picoliter‐volume droplets of starting chemicals on top of each other on the substrate surface, with gold nanoparticles being formed upon heat treatment at 120°C. [ABSTRACT FROM AUTHOR]

Published
2014
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15. Innenrücktitelbild: In Situ Synthesis of Self-Assembled Gold Nanoparticles on Glass or Silicon Substrates through Reactive Inkjet Printing (Angew. Chem. 2/2014).

Author

Abulikemu, Mutalifu, Da'as, Eman Husni, Haverinen, Hanna, Cha, Dongkyu, Malik, Mohammad Azad, and Jabbour, Ghassan Elie

Abstract

Die In ‐ situ ‐ Synthese von Goldnanopartikeln direkt über einer Substratoberfläche durch Tintenstrahldrucken beschreiben G. E. Jabbour et al. in der Zuschrift auf S. 430 ff. Auf diesem Weg sollten auch andere Nanopartikel mit einer Vielzahl an Funktionalitäten zugänglich sein. Im Bild ist das sequenzielle Drucken von pikolitergroßen Tropfen der Ausgangschemikalien aufeinander auf der Substratoberfläche und die Bildung von Goldnanopartikeln beim Erhitzen auf 120°C gezeigt. [ABSTRACT FROM AUTHOR]

Published
2014
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16. Controllable Impregnation Via Inkjet Printing for the Fabrication of Solid Oxide Cell Air Electrodes

Author

Da'as, Eman Husni, Irvine, John T. S., Traversa, Enrico, and Boulfrad, Samir

Abstract

The impregnation method has been considered as one of the most successful techniques for the fabrication of highly efficient electrodes for solid oxide fuel and electrolysis cells (SOCs) at the lab scale. However, because the impregnation is usually performed manually, its irreproducibility remains a major problem that can be solved by using controllable techniques, such as inkjet printing. In this paper, lanthanum strontium manganite (LSM)/yttria stabilized zirconia (YSZ) air electrodes were prepared by infiltrating YSZ porous bodies with LSM precursor solution using inkjet printing, followed by annealing at 800°C for 2 hours. XRD analysis confirmed the formation of the LSM phase, which was in the form of nanoparticles with size in the 50-70 nm range on the YSZ walls, as revealed by FEG-SEM observations. The effect of printing parameters on the distribution of the impregnated phase was investigated and discussed.

Published
2013
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