E.F. Antunes

Instituto Tecnológico de Aeronáutica

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E.J. Corat

National Institute for Space Research

Anderson Oliveira Lobo

Universidade Federal do Piauí

V.J. Trava-Airoldi

National Institute for Space Research

Vladimir Jesus Trava‐Airoldi

National Institute for Space Research

Sandra Ramos

Universidade Estadual de Santa Cruz

Cristina Pacheco Soares

Universidade do Vale do Paraíba

Nathan A. Tomlin

Physical Measurement Laboratory

John H. Lehman

National Institute of Standards and Technology

Atasi Dan

University of Colorado System

Brian L. Wardle

Massachusetts Institute of Technology

Cooperative Institutions

National Institute for Space Research

New York University Press

Universidade Estadual Paulista (Unesp)

Massachusetts Institute of Technology

Universidade de São Paulo

Instituto Tecnológico de Aeronáutica

Universidade do Vale do Paraíba

Physical Measurement Laboratory

Departamento de Ciência e Tecnologia

National Institute of Standards and Technology

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Confinement effect and spreading of water into microchannels fabricated on the VACNT surfaces

Diamond and Related Materials (2011)

Sandra Ramos Getúlio de Vasconcelos E.F. Antunes Anderson Oliveira Lobo V.J. Trava-Airoldi

Superhydrophilicity

Surface Modification

Nanofluidics

10.1016/j.diamond.2011.05.016

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Citations (4)

Retraction notice to “Fast functionalization of vertically aligned multiwalled carbon nanotubes using oxygen plasma” [Mater. Lett. 70 (2012) 89–93]

Materials Letters (2024)

Anderson Oliveira Lobo Sandra Ramos E.F. Antunes Fernanda Roberta Marciano Vladimir Jesus Trava‐Airoldi

Surface Modification

10.1016/j.matlet.2024.136373

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Citations (0)

Fast carbon nanotube growth on carbon fiber keeping tensile strength

Figshare (2020)

Lays Dias Ribeiro Cardoso Marinés Chiquinquirá Carvajal Bravo Gomes E.F. Antunes Fabio Santos Silva Vladimir Jesus Trava‐Airoldi

This work developed a novel approach for carbon nanotube (CNT) direct deposition on carbon fiber (CF) tow surface by chemical vapor deposition (CVD), without degrading CF mechanical properties. This approach combines conditions for growth at low-temperature (650°C), small growth induction period for a fast growth and fast surface modification to enable the growth. The lower growth temperature comes from using the well-known equimolar C₂H₂/CO₂ gas mixture. The floating catalyst from a liquid precursor (with high ferrocene concentration dissolved in hexane) reduced the growth induction period. Gentle surface modification, either by a mild oxidation of CF fiber with silicon containing sizing, or by desized CF exposition to a hexamethyldissiloxane (HMDSO) environment, create silicon oxide clusters. The X-ray Photoelectron Spectroscopy (XPS) analysis show that such clusters need to be in a higher oxidation state – Si(-O)₂, Si(-O)₃ and Si(-O)₄ – to anchor catalyst and enable CNT growth. The first oxidation state – Si(-O)₁ – is not enough. A resin droplet wetting test developed shows that even though the success in CNT growth, the entire processes decrease CF wetting, exposing the need for a resizing procedure. CF mechanical properties were characterized by single-filament and CF tow tensile strength tests.

Carbon fibers

10.6084/m9.figshare.12980066

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Citations (0)

Optical and Structural Properties of PEO-Like Plasma Polymers

Molecular Crystals and Liquid Crystals (2002)

R. Mota Antônio Renato Bigansolli E.F. Antunes Elidiane Cipriano Rangel Nilson Cristino da Cruz

10.1080/713738263

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Citations (1)

Cytocompatibility studies of vertically-aligned multi-walled carbon nanotubes: Raw material and functionalized by oxygen plasma

Materials Science and Engineering C (2010)

Anderson Oliveira Lobo Marcus Alexandre Finzi Corat E.F. Antunes Sandra Ramos Cristina Pacheco Soares

Carbon fibers

10.1016/j.msec.2010.08.010

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Citations (22)

Influence of polar groups on the wetting properties of vertically aligned multiwalled carbon nanotube surfaces

Theoretical Chemistry Accounts (2011)

Sandra Ramos Anderson Oliveira Lobo Getúlio de Vasconcelos E.F. Antunes V.J. Trava-Airoldi

Superhydrophilicity

Plasma Etching

Wetting transition

10.1007/s00214-011-0984-y

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Citations (21)

Woven Hierarchical Aerospace Composite Laminates with Aligned Carbon Nanotube Bulk Reinforcement

56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (2016)

Richard Li E.F. Antunes Andrew H. Liotta Christian Parschau Mark Payne

We demonstrate a method for growing aligned carbon nanotubes (A-CNTs) on carbon fiber (CF) fabrics to create advanced hierarchical aerospace composites with integrated through-thickness reinforcements. To circumvent the in-plane strength reductions that have hitherto compromised mechanical enhancements, we employ non-covalent functionalization of CFs to enable catalyst adhesion, and low temperature chemical vapor deposition. Radially aligned CNTs were observed to grow around individual fibers with lengths ranging from 1-2 microns, and covering across fabric tows. Additionally, successful scale-up to “fuzzy” CFRP laminates was shown through a vacuum assisted epoxy resin infusion technique. Laminates with 50% microfiber and < 1% CNT volume fraction were fabricated. Short-beam shear (SBS) testing was conducted on both baseline and CNT-reinforced laminates. The SBS strength is found to be higher for the baseline laminates on average, with the CNTreinforced laminates having a lower initial failure that sets the SBS strength. However, all fuzzy CFRP cases display significantly enhanced toughness. These opposing results are attributed principally to inhomogeneities in the produced laminates with regard to CNT coverage, which will be the focus of future work.

Aerospace materials

10.2514/6.2016-0149

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Citations (1)

An evaluation of cell proliferation and adhesion on vertically-aligned multi-walled carbon nanotube films

Carbon (2009)

Anderson Oliveira Lobo Marcus Alexandre Finzi Corat E.F. Antunes M.B.S. Palma Cristina Pacheco Soares

Biocompatibility

Viability assay

Surface Modification

10.1016/j.carbon.2009.09.012

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Citations (66)

Fast carbon nanotube growth on carbon fiber keeping tensile strength

Composite Interfaces (2020)

Lays Dias Ribeiro Cardoso Marinés Chiquinquirá Carvajal Bravo Gomes E.F. Antunes Fabio Santos Silva Vladimir Jesus Trava‐Airoldi

This work developed a novel approach for carbon nanotube (CNT) direct deposition on carbon fiber (CF) tow surface by chemical vapor deposition (CVD), without degrading CF mechanical properties. This approach combines conditions for growth at low-temperature (650°C), small growth induction period for a fast growth and fast surface modification to enable the growth. The lower growth temperature comes from using the well-known equimolar C2H2/CO2 gas mixture. The floating catalyst from a liquid precursor (with high ferrocene concentration dissolved in hexane) reduced the growth induction period. Gentle surface modification, either by a mild oxidation of CF fiber with silicon containing sizing, or by desized CF exposition to a hexamethyldissiloxane (HMDSO) environment, create silicon oxide clusters. The X-ray Photoelectron Spectroscopy (XPS) analysis show that such clusters need to be in a higher oxidation state – Si(-O)2, Si(-O)3 and Si(-O)4 – to anchor catalyst and enable CNT growth. The first oxidation state – Si(-O)1 – is not enough. A resin droplet wetting test developed shows that even though the success in CNT growth, the entire processes decrease CF wetting, exposing the need for a resizing procedure. CF mechanical properties were characterized by single-filament and CF tow tensile strength tests.

Surface Modification

Carbon fibers

10.1080/09276440.2020.1817681

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Citations (4)

Monolayer formation of human osteoblastic cells on vertically aligned multiwalled carbon nanotube scaffolds

Cell Biology International (2009)

Anderson Oliveira Lobo E.F. Antunes M.B.S. Palma Cristina Pacheco Soares V.J. Trava-Airoldi

Monolayer formation of SaOS-2 (human osteoblast-like cells) was observed on VACNT (vertically aligned multiwalled carbon nanotubes) scaffolds without purification or functionalization. The VACNT were produced by a microwave plasma chemical vapour deposition on titanium surfaces with nickel or iron as catalyst. Cell viability and morphology studies were evaluated by LDH (lactate dehydrogenase) release assay and SEM (scanning electron microscopy), respectively. The non-toxicity and the flat spreading with monolayer formation of the SaOs-2 on VACNT scaffolds surface indicate that they can be used for biomedical applications.

10.1042/cbi20090131

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Citations (11)