Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Nanostructured material with potential for use in catalyzers: A titanium oxide nanofiber sheet was developed by a FAPESP-funded research group through electrospinning and atomic layer deposition

Abstract:
Titanium oxide (TiO2) nanofibers can have various applications, such as in catalyzers and filters. When TiO2 is excited by ultraviolet light, it degrades organic material. Hence, TiO2 can be applied to filter wastewater for reuse, for example.

Nanostructured material with potential for use in catalyzers: A titanium oxide nanofiber sheet was developed by a FAPESP-funded research group through electrospinning and atomic layer deposition

São Paulo, Brasil | Posted on August 30th, 2019

A new method of fabricating these fibers has been developed in Brazil by Rodrigo Savio Pessoa and Bruno Manzolli Rodrigues, researchers at the Aeronautical Technology Institute's Plasma and Process Laboratory (LPP-ITA) and the Science and Technology Institute of Universidade Brasil (ICT-UB), as part of a project supported by São Paulo Research Foundation - FAPESP. An article on the subject has been published in Materials Today: Proceedings.

"The technique we used is called atomic layer deposition. It promotes growth of the material layer by layer, or even molecule by molecule," Pessoa told.

In the study, TiO2 was deposited on nanofibers of PBAT (poly (butylene adipate-co-terephthalate)), a biopolymer that degrades rapidly in nature, unlike PET (polyethylene terephthalate), which remains intact for decades.

The first step was to produce a membrane of PBAT nanofibers, which was done by electrospinning, a technique similar to that used to make cotton candy, but involving an electrostatic procedure.

"A PBAT solution was electrospun to produce ultrathin nanofibers only a few hundred nanometers thick. These fibers made up the sheet used as a substrate," Pessoa said.

The next step was to coat each fiber with TiO2. "Atomic layer deposition uses precursors of the material of interest produced from gas or liquid that's rapidly evaporated by low pressure. In this case, we used titanium tetrachloride (TiCl4) and water (H2O) as precursors. This was done in a vacuum chamber heated to 100 °C and 150 °C," he explained.

The TiCl4 was released in successive pulses of 0.25 seconds. When released in a vacuum, TiCl4 quickly evaporates and reacts with the surface of the fibers, binding to hydroxyl radicals (OH-) and oxygen radicals (O2-) present in the material.

Because TiCI4 does not react with itself, the initial pulse filled only one layer, which was then oxidized with steam. Hydrogen bound to the chlorine and oxygen bound to the titanium, forming the first monolayer of TiO2.

This procedure was repeated approximately 1,000 times, building up the TiO2 structure layer by layer. To remove the PBAT substrate and free the TiO2 nanotubes, the material was heated to 900 °C in a controlled manner. The result was a sheet of TiO2 nanotubes with a thickness of approximately 100 nanometers.

"The deposition technique is based on surface reactions and therefore results in an even coating, covering the fibers one by one. It's relatively simple but requires automation so that the amount of material and dispersal time are rigorously controlled," Pessoa said.

As a material for filtration, the sheet of TiO2 nanotubes combines the mechanical virtue of blocking particles larger than a specific size with the biochemical virtue of generating radicals that easily degrade organic matter when irradiated with UV light. Because the sheet is made of nanofibers, it has a large surface area, which considerably increases the reaction rate.

####

About FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO
The São Paulo Research Foundation (FAPESP) is a public institution with the mission of supporting scientific research in all fields of knowledge by awarding scholarships, fellowships and grants to investigators linked with higher education and research institutions in the State of São Paulo, Brazil. FAPESP is aware that the very best research can only be done by working with the best researchers internationally. Therefore, it has established partnerships with funding agencies, higher education, private companies, and research organizations in other countries known for the quality of their research and has been encouraging scientists funded by its grants to further develop their international collaboration. You can learn more about FAPESP at http://www.fapesp.br/en and visit FAPESP news agency at http://www.agencia.fapesp.br/en to keep updated with the latest scientific breakthroughs FAPESP helps achieve through its many programs, awards and research centers. You may also subscribe to FAPESP news agency at http://agencia.fapesp.br/subscribe .

For more information, please click here

Contacts:
Joao Carlos Silva

55-113-838-43

Copyright © FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

RELATED JOURNAL ARTICLE:

Related News Press

News and information

Researchers show what drives a novel, ordered assembly of alternating peptides February 20th, 2020

CEA-Leti and CEA-IRIG Demonstrate Quantum Integrated Circuit Combining Quantum Dot with Digital-Analog Circuits on CMOS Chip: Presentation at ISSCC 2020 Shows Role FD-SOI Can Play in Embedding Qubit Arrays with Classic Electronics to Build Large-Scale Quantum Silicon Processors February 20th, 2020

CEA-Leti Presents High-Performance Processor Breakthrough With Active Interposer and 3D Stacked Chiplets at ISSCC 2020 February 19th, 2020

New green technology from UMass Amherst generates electricity 'out of thin air' Renewable device could help mitigate climate change, power medical devices February 17th, 2020

Chemistry

Bubble-capturing surface helps get rid of foam: Bubbly buildup can hinder many industrial processes, but a new method can reduce or even eliminate it February 12th, 2020

The power of going small: Copper oxide subnanoparticle catalysts prove most superior February 11th, 2020

A megalibrary of nanoparticles: Researchers at Penn State have developed a simple approach that could produce over 65,000 different types of complex nanoparticles January 30th, 2020

American Chemical Society names Philip Proteau as new editor-in-chief of the Journal of Natural Products January 24th, 2020

Possible Futures

Researchers show what drives a novel, ordered assembly of alternating peptides February 20th, 2020

CEA-Leti and CEA-IRIG Demonstrate Quantum Integrated Circuit Combining Quantum Dot with Digital-Analog Circuits on CMOS Chip: Presentation at ISSCC 2020 Shows Role FD-SOI Can Play in Embedding Qubit Arrays with Classic Electronics to Build Large-Scale Quantum Silicon Processors February 20th, 2020

CEA-Leti Presents High-Performance Processor Breakthrough With Active Interposer and 3D Stacked Chiplets at ISSCC 2020 February 19th, 2020

New green technology from UMass Amherst generates electricity 'out of thin air' Renewable device could help mitigate climate change, power medical devices February 17th, 2020

Discoveries

Researchers show what drives a novel, ordered assembly of alternating peptides February 20th, 2020

New green technology from UMass Amherst generates electricity 'out of thin air' Renewable device could help mitigate climate change, power medical devices February 17th, 2020

Does graphene cause or prevent the corrosion of copper? New study finally settles the debate: Scientists in Korea are first to observe an unprecedented way in which graphene forms a hybrid layer that prevents copper corrosion February 14th, 2020

KIST unveils the mystery of van der Waals magnets, a material for future semiconductors: Overcoming the limits of current magnetic materials, giving hope for development of next-generation semiconductors February 14th, 2020

Materials/Metamaterials

Does graphene cause or prevent the corrosion of copper? New study finally settles the debate: Scientists in Korea are first to observe an unprecedented way in which graphene forms a hybrid layer that prevents copper corrosion February 14th, 2020

MTU engineers examine lithium battery defects January 28th, 2020

Researchers gain control over internal structure of self-assembled composite materials January 16th, 2020

Buckyballs release electron-positron pairs in forward directions: Theoretical calculations reveal that when impacted by positrons of particular energies, spherical nanoparticles release unstable electron-positron pairs, with signals dominating in the same direction as the incomin December 27th, 2019

Announcements

CEA-Leti and CEA-IRIG Demonstrate Quantum Integrated Circuit Combining Quantum Dot with Digital-Analog Circuits on CMOS Chip: Presentation at ISSCC 2020 Shows Role FD-SOI Can Play in Embedding Qubit Arrays with Classic Electronics to Build Large-Scale Quantum Silicon Processors February 20th, 2020

CEA-Leti Presents High-Performance Processor Breakthrough With Active Interposer and 3D Stacked Chiplets at ISSCC 2020 February 19th, 2020

New green technology from UMass Amherst generates electricity 'out of thin air' Renewable device could help mitigate climate change, power medical devices February 17th, 2020

KIST unveils the mystery of van der Waals magnets, a material for future semiconductors: Overcoming the limits of current magnetic materials, giving hope for development of next-generation semiconductors February 14th, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Researchers show what drives a novel, ordered assembly of alternating peptides February 20th, 2020

New green technology from UMass Amherst generates electricity 'out of thin air' Renewable device could help mitigate climate change, power medical devices February 17th, 2020

Does graphene cause or prevent the corrosion of copper? New study finally settles the debate: Scientists in Korea are first to observe an unprecedented way in which graphene forms a hybrid layer that prevents copper corrosion February 14th, 2020

KIST unveils the mystery of van der Waals magnets, a material for future semiconductors: Overcoming the limits of current magnetic materials, giving hope for development of next-generation semiconductors February 14th, 2020

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project