scholarly journals Formation of Dense and High-Aspect-Ratio Iron Oxide Nanowires by Water Vapor-Assisted Thermal Oxidation and Their Cr(VI) Adsorption Properties

ACS Omega ◽  
2021 ◽  
Author(s):  
Faisal Budiman ◽  
Wai Kian Tan ◽  
Go Kawamura ◽  
Hiroyuki Muto ◽  
Atsunori Matsuda ◽  
...  
Keyword(s):  
Water Vapor ◽  
Iron Oxide ◽  
Aspect Ratio ◽  
Thermal Oxidation ◽  
High Aspect Ratio ◽  
Adsorption Properties ◽  
Oxide Nanowires

scholarly journals Formation of Dense and High-Aspect-Ratio Iron Oxide Nanowires by Water-Vapor-Assisted Thermal Oxidation and their Cr(VI) Adsorption Properties

2021 ◽  
Author(s):  
Faisal Budiman ◽  
Wai Kian Tan ◽  
Go Kawamura ◽  
Hiroyuki Muto ◽  
Atsunori Matsuda ◽  
...  
Keyword(s):  
Water Vapor ◽  
Aspect Ratio ◽  
Thermal Oxidation ◽  
High Aspect Ratio ◽  
Oxidation Process ◽  
Kinetic Characteristic ◽  
Order Kinetic ◽  
Oxide Nanowires ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Abstract In this work, highly crystalline and high aspect ratio α-Fe2O3 nanowire (NWs) were successfully produced by thermal oxidation of iron in water vapor at 800°C. The process was done for 2 h and the NWs were found to be covering the foil uniformly unlike when the oxidation environment was dry whereby the NWs formed were shorted and rather dispersed. The formation of NWs was proposed to be due to a stress-driven surface diffusion during thermal oxidation process. When oxidation was done at 700 oC, we observed coral-like nanostructures. The α-Fe2O3 NWs were then used as adsorbent to remove Cr(VI) from stimulated wastewater. Removal efficiency of 97% in a 225 mg/L Cr(VI) solution was observed indicating very fast removal of Cr(VI) in the presence of the NWs. The kinetic characteristic of the adsorption was fitted to a pseudo-second-order kinetic model, and isothermal studies indicated that the α-Fe2O3 NWs exhibited an adsorption capacity of 66.26 mg/g.

scholarly journals Size Distribution, Mechanical and Electrical Properties of CuO Nanowires Grown by Modified Thermal Oxidation Methods

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1051 ◽  
Author(s):  
Raitis Sondors ◽  
Jelena Kosmaca ◽  
Gunta Kunakova ◽  
Liga Jasulaneca ◽  
Matiss Martins Ramma ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Aspect Ratio ◽  
Electric Field ◽  
Thermal Oxidation ◽  
Size Distribution ◽  
High Aspect Ratio ◽  
Growth Conditions ◽  
Cuo Nanowires ◽  
Young’S Moduli ◽  
Order Of Magnitude

Size distribution, Young’s moduli and electrical resistivity are investigated for CuO nanowires synthesized by different thermal oxidation methods. Oxidation in dry and wet air were applied for synthesis both with and without an external electrical field. An increased yield of high aspect ratio nanowires with diameters below 100 nm is achieved by combining applied electric field and growth conditions with additional water vapour at the first stage of synthesis. Young’s moduli determined from resonance and bending experiments show similar diameter dependencies and increase above 200 GPa for nanowires with diameters narrower than 50 nm. The nanowires synthesized by simple thermal oxidation possess electrical resistivities about one order of magnitude lower than the nanowires synthesized by electric field assisted approach in wet air. The high aspect ratio, mechanical strength and robust electrical properties suggest CuO nanowires as promising candidates for NEMS actuators.

Large-Scale Synthesis of Tungsten Oxide Nanowires with High Aspect Ratio

2003 ◽  
Vol 42 (3) ◽  
pp. 921-924 ◽  
Author(s):  
Xiao-Lin Li ◽  
Jun-Feng Liu ◽  
Ya-Dong Li
Keyword(s):  
Aspect Ratio ◽  
Tungsten Oxide ◽  
High Aspect Ratio ◽  
Large Scale ◽  
Oxide Nanowires ◽  
Large Scale Synthesis

scholarly journals Bacterial iron-oxide nanowires from biofilm waste as a new adsorbent for the removal of arsenic from water

RSC Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 3941-3948 ◽  
Author(s):  
Ivan Andjelkovic ◽  
Sara Azari ◽  
Mason Erkelens ◽  
Peter Forward ◽  
Martin F. Lambert ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Adsorption Properties ◽  
Waste Material ◽  
Oxide Nanowires ◽  
Removal Of Arsenic

Biofilm waste material generated by the bacteria in the groundwater pipelines was found is composed of amorphous twisted iron-oxide nanowires which are shown to have considerable adsorption properties for removal As(iii) and As(v) ions from waters.

Leptothrix sp. sheaths modified with iron oxide particles: Magnetically responsive, high aspect ratio functional material

2017 ◽  
Vol 71 ◽  
pp. 1342-1346 ◽  
Author(s):  
Ivo Safarik ◽  
Ralitsa Angelova ◽  
Eva Baldikova ◽  
Kristyna Pospiskova ◽  
Mirka Safarikova
Keyword(s):  
Iron Oxide ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Functional Material ◽  
Iron Oxide Particles ◽  
Oxide Particles

Tunable High Aspect Ratio Iron Oxide Nanorods for Enhanced Hyperthermia

2016 ◽  
Vol 120 (18) ◽  
pp. 10086-10093 ◽  
Author(s):  
Raja Das ◽  
Javier Alonso ◽  
Zohreh Nemati Porshokouh ◽  
Vijaysankar Kalappattil ◽  
David Torres ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Oxide Nanorods

scholarly journals Magnetic microparticle concentration and collection using a mechatronic magnetic ratcheting system

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0246124
Author(s):  
Oladunni B. Adeyiga ◽  
Coleman Murray ◽  
Hector E. Muñoz ◽  
Alberto Escobar ◽  
Dino Di Carlo
Keyword(s):  
Magnetic Field ◽  
Iron Oxide ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Concentration Factor ◽  
Magnetic Particles ◽  
Superparamagnetic Iron Oxide ◽  
Iron Oxide Particles ◽  
Superparamagnetic Iron Oxide Particles ◽  
Oxide Particles

Magnetic ratcheting cytometry is a promising approach to separate magnetically-labeled cells and magnetic particles based on the quantity of magnetic material. We have previously reported on the ability of this technique to separate magnetically-labeled cells. Here, with a new chip design, containing high aspect ratio permalloy micropillar arrays, we demonstrate the ability of this technique to rapidly concentrate and collect superparamagnetic iron oxide particles. The platform consists of a mechatronic wheel used to generate and control a cycling external magnetic field that impinges on a “ratcheting chip.” The ratcheting chip is created by electroplating a 2D array of high aspect ratio permalloy micropillars onto a glass slide, which is embedded in a thin polymer layer to create a planar surface above the micropillars. By varying magnetic field frequency and direction through wheel rotation rate and angle, we direct particle movement on chip. We explore the operating conditions for this system, identifying the effects of varying ratcheting frequency, along with time, on the dynamics and resulting concentration of these magnetic particles. We also demonstrate the ability of the system to rapidly direct the movement of superparamagnetic iron oxide particles of varying sizes. Using this technique, 2.8 μm, 500 nm, and 100 nm diameter superparamagnetic iron oxide particles, suspended within an aqueous fluid, were concentrated. We further define the ability of the system to concentrate 2.8 μm superparamagnetic iron oxide particles, present in a liquid suspension, into a small chip surface area footprint, achieving a 100-fold surface area concentration, and achieving a concentration factor greater than 200%. The achieved concentration factor of greater than 200% could be greatly increased by reducing the amount of liquid extracted at the chip outlet, which would increase the ability of achieving highly sensitive downstream analytical techniques. Magnetic ratcheting-based enrichment may be useful in isolating and concentrating subsets of magnetically-labeled cells for diagnostic automation.

Crystalline iron oxide nanotube arrays with high aspect ratio as binder free anode for Li-ion batteries

2014 ◽  
Vol 211 (8) ◽  
pp. 1889-1894 ◽  
Author(s):  
Syed Atif Pervez ◽  
Doohun Kim ◽  
Umer Farooq ◽  
Adnan Yaqub ◽  
Jeong-Hee Choi ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Nanotube Arrays ◽  
Li Ion Batteries ◽  
Binder Free ◽  
Li Ion

High aspect ratio silicon nanomoulds for UV embossing fabricated by directional thermal oxidation using an oxidation mask

2007 ◽  
Vol 18 (35) ◽  
pp. 355307 ◽  
Author(s):  
Long Qing Chen ◽  
Mary B Chan-Park ◽  
Ye Hai Yan ◽  
Qing Zhang ◽  
Chang Ming Li ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Thermal Oxidation ◽  
High Aspect Ratio
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