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Prof. Dr. Mariana Amorim Fraga

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Applied Nanoscience and Plasma Technology Group, Department of Bioengineering, Universidade Brasil, São Paulo, Brazil
Interests: thin films; silicon carbide and related materials; biomedical materials; wide bandgap semiconductor materials; high performance coatings for technological applications; materials for solar energy conversion; aerospace materials; sensors and transducers; MEMS; bioMEMS and microelectronics processes
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Prof. Dr. Bruno Vinícius Manzolli Rodrigues

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Applied Nanoscience and Plasma Technology Group, Universidade Brasil, Sao Paulo, Brazil
Interests: nano- and biosensors; characterization and applications of carbon-based nanostructured biomaterials; bioresorbable polymers; production of nanostructured materials; chemical synthesis of nanostructured bioceramics; evaluation of the in vitro biomineralization process; superficial modifications of nanostructured biomaterials; biomaterial interactions with biological systems

Prof. Dr. Jorge Augusto de Moura Delezuk

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Federal Institute of Paraná, Campus Irati, St. Pedro Koppe, 100, Irati, PR 84500-000, Brazil
Interests: nanosensors; biosensors; nanomotors; characterization and applications of nanostructured biomaterials and biopolymers
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Prof. Dr. Rodrigo Sávio Pessoa

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Instituto Tecnológico de Aeronáutica, Brazil
Interests: materials processing; plasma physics; nanotechnology; atomic layer deposition; biomedical materials; aerospace materials; solar cells; surface treatment; etching of materials by plasma (reactive ion etching, inductively coupled plasma, hollow cathode RIE); biosensors; bioMEMS

Special Issue Information

Dear Colleagues,

The Nano-Biomaterials Symposium is one of the twenty-one thematic symposia of the XVII Brazilian Materials Research Society (B-MRS) Meeting, which will be held in Natal-RN, Brazil, 16–20 September, 2018. The main objective of this symposium is to provide the opportunity for interactions among researchers, professors, students, and other professionals working in the area of biomaterials. For this, the Nano-Biomaterials Symposium will focus on discussing the state-of-the-art of nanomaterials for biomedical applications, including their different approaches and applications. In addition, it also covers studies focused on the design and characterization of materials used in the fabrication of biomedical devices and sensors. Emphasis will be given to the design of novel (bio)-nanomaterials as potential candidates to integrate multifunctional devices targeting self-assembly materials. This Special Issue selects excellent papers from the Nano-Biomaterials Symposium—XVII B-MRS Meeting and includes, but is not limited to, the following topics:

Nanotechnology and Drug Delivery
Biocompatible Materials
Bioactive Materials
Biomimetics
Implants and Coatings
Materials for Medical Devices
Materials in Clinical Dentistry
Materials in Orthopedics and Biomechanics
Development of Sensors and Biosensors
Tissue Engineering and Regenerative Medicine

Prof. Dr. Mariana Amorim Fraga
Prof. Dr. Bruno Vinícius Manzolli Rodrigues
Prof. Dr. Jorge Augusto de Moura Delezuk
Prof. Dr. Rodrigo Sávio Pessoa
Guest Editors

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Keywords

Nanotechnology
Biomaterials
Drug Delivery
Biosensors
Biodevices
Biomedical Applications
Bioengineering

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Research

15 pages, 3344 KiB

Open AccessArticle

Atomic Layer Deposited TiO₂ and Al₂O₃ Thin Films as Coatings for Aluminum Food Packaging Application

by Vanessa Dias, Homero Maciel, Mariana Fraga, Anderson O. Lobo, Rodrigo Pessoa and Fernanda R. Marciano

Materials 2019, 12(4), 682; https://doi.org/10.3390/ma12040682 - 25 Feb 2019

Cited by 30 | Viewed by 6591

Abstract

Titanium dioxide (TiO₂) and aluminum oxide (Al₂O₃) coatings have been investigated in a wide range of bio-applications due to their biodegradation and biocompatibility properties, that are key parameters for their use in the food packaging and biomedical devices fields. The present study evaluates and compares the electrochemical behavior of the non-coated, commercial resin-coated, TiO₂-coated and Al₂O₃-coated aluminum in commercial beer electrolyte. For this, TiO₂ and Al₂O₃ thin films were deposited on aluminum (Al) substrates using atomic layer deposition (ALD). The evaluation of the corrosion barrier layer properties was performed by linear sweep voltammetry (LSV) during 10 min and electrochemical impedance spectroscopy (EIS). In addition, profilometry, grazing incidence X-ray diffractometry (GIXRD), scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR) analyses were performed to investigate the physical and chemical properties of the pristine and / or corroded samples. TiO₂ and Al₂O₃ films presented an amorphous structure, a morphology that follows Al substrate surface, and a thickness of around 100 nm. Analysis of LSV data showed that ALD coatings promoted a considerable increase in corrosion barrier efficiency being 86.3% for TiO₂-coated Al and 80% for Al₂O₃-coated Al in comparison with 7.1% of commercial resin-coated Al. This is mainly due to the lower electrochemical porosity, 11.4% for TiO₂-coated Al and 20.4% for Al₂O₃-coated Al in comparison with 96% of the resin-coated Al, i.e. an increase of up to twofold in the protection of Al when coated with TiO₂ compared to Al₂O₃. The EIS results allow us to complement the discussions about the reduced corrosion barrier efficiency of the Al₂O₃ film for beer electrolyte once SEM and FT-IR analyzes did not show drastic changes in both investigated ALD films after the corrosion assays. The above results indicate that ALD TiO₂ and Al₂O₃ films may be a viable alternative to replace the synthetic resin coatings frequently used in aluminum cans of use in the food industry. Full article

(This article belongs to the Special Issue Selected Papers from NanoBio Symposium- XVII B-MRS Meeting)

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