The two-step electrosynthesis of nanocomposites of Ag, Au, and Pd nanoparticles with iron(ii) oxide-hydroxide

2022 ◽  
Author(s):  
Rezeda R. Fazleeva ◽  
Gulnaz R. Nasretdinova ◽  
Aidar T. Gubaidullin ◽  
Vladimir G. Evtyugin ◽  
Vitaliy V. Yanilkin
Keyword(s):  
Iron Oxide ◽  
Pd Nanoparticles ◽  
Metal Nanoparticle ◽  
Oxide Hydroxide

The two-step electrosynthesis of metal nanoparticle (MNP, M = Ag, Pd, and Au) nanocomposites with iron oxide-hydroxide FeO-xFe(OH)2 was investigated.

Droplet Factories: Synthesis and Assembly of Silver and Palladium Nanoparticles at the Liquid-Liquid Interface

2019 ◽  
Author(s):  
Suchanuch Sachdev ◽  
Rhushabh Maugi ◽  
Sam Davis ◽  
Scott Doak ◽  
Zhaoxia Zhou ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Reaction Rate ◽  
Tertiary Structure ◽  
Flow Reactor ◽  
Pd Nanoparticles ◽  
Subsequent Removal ◽  
Immiscible Liquids ◽  
Flow Reactors ◽  
Droplet Flow ◽  
One Step

<div>The interface between two immiscible liquids represent an ideal substrate for the assembly of nanomaterials. The defect free surface provides a reproducible support for creating densely packed ordered materials. Here a droplet flow reactor is presented for the synthesis and/ or assembly of nanomaterials at the interface of the emulsion. Each droplet acts as microreactor for a reaction between decamethylferrocene (DmFc) within the hexane and metal salts (Ag+/ Pd2+) in the aqueous phase. The hypothesis was that a spontaneous, interfacial reaction would lead to the assembly of nanomaterials creating a Pickering emulsion. The subsequent removal of the solvents showed how the Ag nanoparticles were trapped at the interface and retain the shape of the droplet, however the Pd nanoparticles were dispersed with no tertiary structure. To further exploit this, a one-step process where the particles are synthesised and then assembled into core-shell materials was proposed. The same reactions were performed in the presence of oleic acid stabilise Iron oxide nanoparticles dispersed within the hexane. It was shown that by changing the reaction rate and ratio between palladium and iron oxide a continuous coating of palladium onto iron oxide microspheres can be created. The same reaction with silver, was unsuccessful and resulted in the silver particles being shed into solution, or incorporated within the iron oxide micro particle. These insights offer a new method and chemistry within flow reactors for the creation of palladium and silver nanoparticles. We use the technique to create metal coated iron oxide nanomaterials but the methodology could be easily transferred to the assembly of other materials.</div><div><br></div>

scholarly journals Superionic iron oxide–hydroxide in Earth’s deep mantle

2021 ◽  
Vol 14 (3) ◽  
pp. 174-178 ◽  
Author(s):  
Mingqiang Hou ◽  
Yu He ◽  
Bo Gyu Jang ◽  
Shichuan Sun ◽  
Yukai Zhuang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Hydroxide ◽  
Deep Mantle

scholarly journals Low-crystalline iron oxide hydroxide nanoparticle anode for high-performance supercapacitors

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Kwadwo Asare Owusu ◽  
Longbing Qu ◽  
Jiantao Li ◽  
Zhaoyang Wang ◽  
Kangning Zhao ◽  
...  
Keyword(s):  
Iron Oxide ◽  
High Performance ◽  
Oxide Hydroxide ◽  
Low Crystalline

scholarly journals Creation of Nanomagnetite Aggregated Iron Oxide Hydroxide for Magnetically Removal of Fluoride and Phosphate from Wastewater

2007 ◽  
Vol 47 (4) ◽  
pp. 558-562 ◽  
Author(s):  
Akbar Eskandarpour ◽  
Kensuke Sassa ◽  
Yoshiyuki Bando ◽  
Hiroshi Ikuta ◽  
Kazuhiko Iwai ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Hydroxide

Synthesis of Highly Active Pd Nanoparticles Supported Iron Oxide Catalyst for Selective Hydrogenation and Cross‐Coupling Reactions in Aqueous Medium

2019 ◽  
Vol 4 (17) ◽  
pp. 5019-5032 ◽  
Author(s):  
Astha Shukla ◽  
Rajib K. Singha ◽  
Takehiko Sasaki ◽  
Vemulapalli V. D. N. Prasad ◽  
Rajaram Bal
Keyword(s):  
Iron Oxide ◽  
Aqueous Medium ◽  
Selective Hydrogenation ◽  
Oxide Catalyst ◽  
Cross Coupling ◽  
Pd Nanoparticles ◽  
Coupling Reactions ◽  
Iron Oxide Catalyst ◽  
Cross Coupling Reactions ◽  
Highly Active

scholarly journals Supports and modified nano-particles for designing model catalysts

2016 ◽  
Vol 188 ◽  
pp. 309-321 ◽  
Author(s):  
C. P. O'Brien ◽  
K.-H. Dostert ◽  
M. Hollerer ◽  
C. Stiehler ◽  
F. Calaza ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Pd Nanoparticles ◽  
Metal Nanoparticle ◽  
Model Systems ◽  
Nano Particles ◽  
Structure Changes ◽  
Hydrogenation Reactions ◽  
Composite Nature ◽  
Specific Reactions ◽  
Supported Pd

In order to design catalytic materials, we need to understand the essential causes for material properties resulting from its composite nature. In this paper we discuss two, at first sight, diverse aspects: (a) the effect of the oxide–metal interface on metal nanoparticle properties and (b) the consequences of metal particle modification after activation on the selectivity of hydrogenation reactions. However, these two aspects are intimately linked. The metal nanoparticle’s electronic structure changes at the interface as a catalyst is brought to different reaction temperatures due to morphological modifications in the metal and, as we will discuss, these changes in the chemistry lead to changes in the reaction path. As the morphology of the particle varies, facets of different orientations and sizes are exposed, which may lead to a change in the surface chemistry as well. We use two specific reactions to address these issues in some detail. To the best of our knowledge, the present paper reports the first observations of this kind for well-defined model systems. The changes in the electronic structure of Au nanoparticles due to their size and interaction with a supporting oxide are revealed as a function of temperature using CO2 activation as a probe. The presence of spectator species (oxopropyl), formed during an activation step of acrolein hydrogenation, strongly controls the selectivity of the reaction towards hydrogenation of the unsaturated CO bond vs. the CC bond on Pd(111) when compared with oxide-supported Pd nanoparticles.

scholarly journals Semi-continuous Magnetic Removal of Phosphate Using an Iron Oxide Hydroxide Adsorbent and Regeneration of Its Adsorbent

2007 ◽  
Vol 47 (4) ◽  
pp. 563-567 ◽  
Author(s):  
Akbar Eskandarpour ◽  
Kensuke Sassa ◽  
Yoshiyuki Bando ◽  
Masazumi Okido ◽  
Kazuhiko Iwai ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Oxide Hydroxide
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