The formation of TiO2 nanoporous/nanotubular structure on NiTi substrate with amorphous, nanocrystalline and microcrystalline structures

2021 ◽  
pp. 125354
Author(s):  
H. Aghabeygzadeh ◽  
M. Tavoosi ◽  
E. Mohamadsharifi
Keyword(s):  
Nanotubular Structure

scholarly journals Suitability of Different Titanium Dioxide Nanotube Morphologies for Photocatalytic Water Treatment

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 708
Author(s):  
Clayton Farrugia ◽  
Alessandro Di Mauro ◽  
Frederick Lia ◽  
Edwin Zammit ◽  
Alex Rizzo ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Water Treatment ◽  
Environmental Remediation ◽  
Survival Rates ◽  
Bacterial Survival ◽  
Nanotubular Structure ◽  
Excellent Activity ◽  
Uva Light ◽  
High Degree

Photocatalysis has long been touted as one of the most promising technologies for environmental remediation. The ability of photocatalysts to degrade a host of different pollutants, especially recalcitrant molecules, is certainly appealing. Titanium dioxide (TiO2) has been used extensively for this purpose. Anodic oxidation allows for the synthesis of a highly ordered nanotubular structure with a high degree of tunability. In this study, a series of TiO2 arrays were synthesised using different electrolytes and different potentials. Mixed anatase-rutile photocatalysts with excellent wettability were achieved with all the experimental iterations. Under UVA light, all the materials showed significant photoactivity towards different organic pollutants. The nanotubes synthesised in the ethylene glycol-based electrolyte exhibited the best performance, with near complete degradation of all the pollutants. The antibacterial activity of this same material was similarly high, with extremely low bacterial survival rates. Increasing the voltage resulted in wider and longer nanotubes, characteristics which increase the level of photocatalytic activity. The ease of synthesis coupled with the excellent activity makes this a viable material that can be used in flat-plate reactors and that is suitable for photocatalytic water treatment.

Nickel Oxide Coated on Pretreated MWCNTs as an Electrode for Supercapacitor

2013 ◽  
Vol 829 ◽  
pp. 654-658
Author(s):  
Lida Mahmoudi ◽  
Farzad Mahboubi ◽  
Moreteza Saghafi Yazdi
Keyword(s):  
Nickel Oxide ◽  
Thermal Annealing ◽  
Nickel Hydroxide ◽  
Annealing Temperature ◽  
Electrochemical Characteristics ◽  
Sem Images ◽  
Electroactive Materials ◽  
Nanotubular Structure ◽  
Individual Cnts ◽  
The Individual

Nickel oxide/carbon nanotubes (NiO/CNTs) composite materials for supercapacitor are prepared by chemically depositing of nickel hydroxide onto CNTs pretreated by ultrasonication and followed by thermal annealing at 200-300°C. A series of NiO/CNTs composites with different weight ratios of CNTs and different annealing temperature are synthesized via the same route. The scanning electron microscope (SEM) images show that the nucleation of the nickel hydroxide formed on the outer walls of CNTs due to ultrasonic cavitations, and then nickel oxide coated uniformly on the outer surface of the individual CNTs after thermal annealing. The NiO/CNTs electrode presents a maximum specific capacitance of 254 F/g as well as a good cycle life in 2 M KOH electrolyte. The good electrochemical characteristics of NiO/CNTs composite can be attributed to the three-dimensionally interconnected nanotubular structure with a thin film of electroactive materials.

A Prototypical Zeolitic Lanthanide−Organic Framework with Nanotubular Structure

2008 ◽  
Vol 8 (1) ◽  
pp. 166-168 ◽  
Author(s):  
You-Gui Huang ◽  
Fei-Long Jiang ◽  
Da-Qiang Yuan ◽  
Ming-Yan Wu ◽  
Qiang Gao ◽  
...  
Keyword(s):  
Nanotubular Structure ◽  
Organic Framework

scholarly journals Effects of Annealing Temperature on the Crystal Structure, Morphology, and Optical Properties of Peroxo-Titanate Nanotubes Prepared by Peroxo-Titanium Complex Ion

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1331 ◽  
Author(s):  
Hyunsu Park ◽  
Tomoyo Goto ◽  
Sunghun Cho ◽  
Soo Wohn Lee ◽  
Masato Kakihana ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Precursor Solution ◽  
Titanate Nanotubes ◽  
Layered Compound ◽  
Alkali Concentration ◽  
Complex Ions ◽  
Nanotubular Structure ◽  
Structure Morphology ◽  
Hydrogen Titanate

This study addresses the effects of annealing temperatures (up to 500 °C) on the crystal structure, morphology, and optical properties of peroxo groups (–O–O–) containing titanate nanotubes (PTNTs). PTNTs, which possess a unique tubular morphology of layered-compound-like hydrogen titanate structure (approximately 10 nm in diameter), were synthesized using peroxo-titanium (Ti–O–O) complex ions as a precursor under very mild conditions—temperature of 100 °C and alkali concentration of 1.5 M—in the precursor solution. The nanotubular structure was dismantled by annealing and a nanoplate-like structure within the range of 20–50 nm in width and 100–300 nm in length was formed at 500 °C via a nanosheet structure by decreasing the specific surface area. Hydrogen titanate-based structures of the as-synthesized PTNTs transformed directly into anatase-type TiO2 at a temperature above 360 °C due to dehydration and phase transition. The final product, anatase-based titania nanoplate, was partially hydrogen titanate crystal in nature, in which hydroxyl (–OH) bonds exist in their interlayers. Therefore, the use of Ti–O–O complex ions contributes to the improved thermal stability of hydrogen titanate nanotubes. These results show a simple and environmentally friendly method that is useful for the synthesis of functional nanomaterials for applications in various fields.

Design and Synthesis of 3d−4f Metal-Based Zeolite-type Materials with a 3D Nanotubular Structure Encapsulated “Water” Pipe

2004 ◽  
Vol 126 (10) ◽  
pp. 3012-3013 ◽  
Author(s):  
Bin Zhao ◽  
Peng Cheng ◽  
Xiaoyan Chen ◽  
Cai Cheng ◽  
Wei Shi ◽  
...  
Keyword(s):  
Water Pipe ◽  
Design And Synthesis ◽  
Nanotubular Structure ◽  
Zeolite Type

Synthesis of TiO2 Nanotube Arrays in NaOH Added Ethylene Glycol Electrolyte and the Effect of Annealing Temperature on the Nanotube Arrays to their Photocurrent Performance

2016 ◽  
Vol 701 ◽  
pp. 28-32 ◽  
Author(s):  
Mustaffa Ali Azhar Taib ◽  
G. Kawamura ◽  
Atsunori Matsuda ◽  
Mariatti Jaafar ◽  
Khairunisak Abdul Razak ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Ethylene Glycol ◽  
Annealing Temperature ◽  
Anodic Process ◽  
Nanotube Arrays ◽  
Nanotubular Structure ◽  
Titanium Dioxide Nanotube Arrays ◽  
Higher Temperature

The present study employs NaOH as an oxygen source in fluorinated ethylene glycol (EG) electrolyte for the formation of titanium dioxide nanotube arrays (TiO2 NTs) by anodic process. The nanotube formed were 125 nm in diameter with length of ~ 7 µm after 30 min of anodization. They were then annealed to study the effect of annealing temperature on the photocurrent generated by the TiO2 NTs. It is found that TiO2 NTs annealed at 400 °C has the highest photocurrent (0.716 mA cm-2 at 0.5 V vs Ag/AgCl). This is attributed to the crystallinity (mostly anatase) of the TiO2 NTs as well as the nanotubular structure which retains at this temperature but not at higher temperature.

Formation of nanotubular structure on low-modulus Ti–7.5Mo alloy surface and its bioactivity evaluation

2019 ◽  
Vol 669 ◽  
pp. 329-337 ◽  
Author(s):  
Hsueh-Chuan Hsu ◽  
Shih-Kuang Hsu ◽  
Shih-Ching Wu ◽  
Wen-Fu Ho
Keyword(s):  
Alloy Surface ◽  
Nanotubular Structure ◽  
Low Modulus
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