AA Hidalgo

AA Hidalgo

Universidade Federal do Piauí

H-index: 11

Latin America-Brazil

About AA Hidalgo

AA Hidalgo, With an exceptional h-index of 11 and a recent h-index of 7 (since 2020), a distinguished researcher at Universidade Federal do Piauí, specializes in the field of Física da Matéria Condensada.

His recent articles reflect a diverse array of research interests and contributions to the field:

Anticorrosive effect of green sulfonated PANI-Zn with epoxy for the corrosion protection of aluminum alloy 6061-T651

ITO/polymer/Al from diode-like to memory device: electroforming, multilevel resistive switching, and quantum point contact

Study of the Optoelectronic Properties of Titanium Nitride Thin Films Deposited on Glass by Reactive Sputtering in the Cathodic Cage

Surface modification of Ti6Al7Nb alloy by Al2O3 nanofilms and calcium phosphate coatings

Depositation of sodium titanate nanotubes: superhydrophilic surface and antibacterial approach

Characterization and Evaluation of Layered Bi2WO6 Nanosheets as a New Antibacterial Agent

A comparison between electrospinning and rotary-jet spinning to produce PCL fibers with low bacteria colonization

AA Hidalgo Information

University

Universidade Federal do Piauí

Position

Professor de Física

Citations(all)

458

Citations(since 2020)

177

Cited By

367

hIndex(all)

11

hIndex(since 2020)

7

i10Index(all)

11

i10Index(since 2020)

5

Email

University Profile Page

Universidade Federal do Piauí

AA Hidalgo Skills & Research Interests

Física da Matéria Condensada

Top articles of AA Hidalgo

Anticorrosive effect of green sulfonated PANI-Zn with epoxy for the corrosion protection of aluminum alloy 6061-T651

Authors

Natália da Silva Ferreira,Rafael Marinho Bandeira,Maelson Sousa Nunes,Vicente de Sousa Marques,Maria Leticia Vega,Angel Alberto Hidalgo,Mahendra Rai,José Ribeiro dos Santos Junior,José Milton Elias de Matos

Journal

Progress in Organic Coatings

Published Date

2024/6/1

The synergistic effect of epoxy resin and PANI-metal composites in anti-corrosion coatings is well known. However, the conventional chemical synthesis of PANI and its composites generates environmentally hazardous waste on an industrial scale. Given this, the study proposes synthesis of PANI-Zn composites by a “green” method to protect the AA6061-T651 alloy against corrosion. For the synthesis, hydrogen peroxide and sulphuric acid were used to promote polymerization and doping. PANI-Zn were characterized by FTIR, UV–Vis, XPS, XRF, ICP-OES and SEM. To prepare the coatings, 10 mg of composites were dissolved in 500 μL of ethanol/NMP solution (1:1) and mixed with 500 mg of epoxy resin and 250 mg of hardener. These were applied to AA6061-T651 alloys by the drop-casting method and allowed to stand at room temperature for 7 days, followed by heating at 70 °C for 1 h. After curing, the coatings …

ITO/polymer/Al from diode-like to memory device: electroforming, multilevel resistive switching, and quantum point contact

Authors

Guilherme Severino Mendes de Araújo,Helder Nunes da Cunha,João Mariz Guimarães Neto,Cleânio da Luz Lima,Alexandre de C Maciel,Ángel Alberto Hidalgo,Maria Leticia Vega

Journal

Journal of Materials Science: Materials in Electronics

Published Date

2024/1

In this work, we present a study on the resistive memory properties of ITO/MEH-PPV/Al devices. The pristine diode-like device, highly resistive, needs an electroforming process to turn the device into a memory with resistive switching. During electroforming, I-V sweeps are described using Schottky Emission (SE) and Fowler-Nordheim (FN) models, resulting in an injection barrier around ~ 0.8 to 0.9 eV that may be associated with injection through polymer/Al interface. At high resistance sate (HRS), the linear coefficient of the curve is at low voltages and present a transition to when the device is close to switching voltage. At low resistance state (LRS), we observe up to the negative differential resistance (NDR). In our devices, exploring the reverse bias NDR at different levels, it is possible to observe multilevel conducting states in direct bias sweeps (opposite polarizations), unlike unipolar memories, that show multilevel …

Study of the Optoelectronic Properties of Titanium Nitride Thin Films Deposited on Glass by Reactive Sputtering in the Cathodic Cage

Authors

Hunos Paixão Madureira,Renan Matos Monção,Adriano Almeida Silva,Angel Alberto Hidalgo,Maria Letícia Vega,Michelle Cequeira Feitor,Francisco Eroni Paz Santos,Thércio Henrique de Carvalho Costa,Rômulo Ribeiro Magalhães de Sousa

Journal

Materials Research

Published Date

2023/10/30

We investigate the structural, optical, thermal-optical, and electronic properties of TiNx thin films utilizing a variety of experimental techniques, including spectroscopic ellipsometry, Raman spectroscopy, scanning electron microscopy, atomic force microscopy, thermal lens spectroscopy, and UV-VIS spectroscopy. Our experimental results indicate a remarkable metallic character in the TiNx thin films deposited under lower N2 flow during treatment, as well as an increase in reflectance in the infrared region and thermal diffusivity as the partial N2 flow is reduced, which is consistent with previous experimental studies. The microscopic origin of these trends is explained in terms of the atomic structure of the system, where Ti atoms contribute free carriers that interact with IR radiation and N atoms create imperfections in the lattice, causing greater scattering of phonons, respectively. The experimental results also indicate that the roughness of the films produced with a lower N2 partial flow was lower than that of the films with a higher N2 partial flow. To explain the deviation of optical properties from the ideal case, surface oxidation is also investigated. This facilitates the coating of smarting windows with TiNx thin films.

Surface modification of Ti6Al7Nb alloy by Al2O3 nanofilms and calcium phosphate coatings

Authors

Luciana Mendes Ribeiro de Sousa,Moises das Virgens Santana,Bruno Pereira da Silva,Thays Oliveira Marques,Ramón R Peña-Garcia,Angel Alberto Hidalgo,Maria Letícia Vega,Bartolomeu Cruz Viana,Thiago Domingues Stocco,Luana Marotta Reis de Vasconcellos,William Chiappim,Rodrigo Sávio Pessoa,Fernanda Roberta Marciano,Anderson Oliveira Lobo

Journal

Surface and Coatings Technology

Published Date

2023/3/15

Here we have modified Ti6Al7Nb alloy by Al2O3 using Atomic Layer Deposition (ALD) and apatite coating electrodeposited and by Simulated Body Fluid method. X-Ray Fluorescence (FRX), Energy Scattering X-Ray Spectroscopy (EDS), Scanning Electron Microscopy (SEM), X-Ray Diffraction Spectroscopy (XRD), Raman Spectroscopy and Force Microscopy Atomic (AFM) revealed the chemical and crystallographic composition of Ti6Al7Nb before and after surface modifications. A laminar apatite crystal in the form of plates and irregular crystals, with the appearance of flakes growing from the center to the edge and resembling flowers were produced closed to synthetic apatite's. In vitro biological tests showed that surface modifications in the titanium alloy Ti6Al7Nb improved the bioactivity attributed to the formation of microporosity favorable to the greater production of total proteins and, also, influenced the …

Depositation of sodium titanate nanotubes: superhydrophilic surface and antibacterial approach

Authors

Michelle de P Madeira,Suziete BS Gusmão,Idglan S de Lima,Gabriella MD Lemos,Humberto M Barreto,Érika de A Abi-chacra,Maria L Vega,Angel A Hidalgo,Francisco EP Santos,Edson C Silva-Filho,Bartolomeu C Viana,JA Osajima

Journal

Journal of Materials Research and Technology

Published Date

2022/7/1

Here, the present work aimed to investigate the wettability of the sodium titanate nanotubes films and evaluate the antibacterial activity of the nanotubes powder under light and bacterial adhesion assay. The films were deposited by electrophoretic deposition technique on FTO glass and sodium titanate nanotubes were synthesized via microwave-assisted hydrothermal. Raman analysis, X-ray Diffraction, and Scanning Electron Microscopy confirmed the deposition of the nanotubes. Atomic Force Microscopy showed that the roughness of the films is superior to the roughness of the FTO. The water contact angle decreases from 37.85°(clean FTO) to 9.53° after deposition of the nanotubes. It reaches 0.00° after irradiation under ultraviolet light. The surface free energy of the FTO increases from 69.91 mN/m (clean FTO) to 81.43 mN/m after nanotube deposition and irradiation. Adhesion assays showed inhibition in …

Characterization and Evaluation of Layered Bi2WO6 Nanosheets as a New Antibacterial Agent

Authors

Maria Karollyna do Nascimento Silva Leandro,João Victor Barbosa Moura,Paulo de Tarso Cavalcante Freire,Maria Leticia Vega,Cleânio da Luz Lima,Ángel Alberto Hidalgo,Ana Carolina Justino de Araújo,Priscilla Ramos Freitas,Cicera Laura Roque Paulo,Amanda Karine de Sousa,Janaina Esmeraldo Rocha,Lívia Maria Garcia Leandro,Rakel Olinda Macedo da Silva,Natália Cruz-Martins,Henrique Douglas Melo Coutinho

Journal

Antibiotics

Published Date

2021/9

Background: Pathogenic microorganisms are causing increasing cases of mortality and morbidity, along with alarming rates of ineffectiveness as a result of acquired antimicrobial resistance. Bi2WO6 showed good potential to be used as an antibacterial substance when exposed to visible light. This study demonstrates for the first time the dimension-dependent antibacterial activity of layered Bi2WO6 nanosheets. Materials and methods: The synthesized layered Bi2WO6 nanosheets were prepared by the hydrothermal method and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and Raman and Fourier transform infrared spectroscopy (FTIR). Antibacterial and antibiotic-modulation activities were performed in triplicate by the microdilution method associated with visible light irradiation (LEDs). Results: Bi2WO6 nanosheets were effective against all types of bacteria tested, with MIC values of 256 μg/mL against Escherichia coli standard and resistant strains, and 256 μg/mL and 32 μg/mL against Staphylococcus aureus standard and resistant strains, respectively. Two-dimensional (2D) Bi2WO6 nanosheets showed antibacterial efficiency against both strains studied without the presence of light. Conclusions: Layered Bi2WO6 nanosheets revealed dimension-dependent antibacterial activity of the Bi2WO6 system.

A comparison between electrospinning and rotary-jet spinning to produce PCL fibers with low bacteria colonization

Authors

MM Machado-Paula,MAF Corat,M Lancellotti,G Mi,FR Marciano,ML Vega,AA Hidalgo,TJ Webster,AO Lobo

Journal

Materials Science and Engineering: C

Published Date

2020/6/1

One of the important components in tissue engineering is material structure, providing a model for fixing and the development of cells and tissues, which allows for the transport of nutrients and regulatory molecules to and from cells. The community claims the need for new materials with better properties for use in the clinic. Poly (ε-caprolactone) (PCL) is a biodegradable polymer, semi crystalline, with superior mechanical properties and has attracted an increasing interest due to its usefulness in various biomedical applications. Herein, two different methods (electrospinning versus rotary jet spinning) with different concentrations of PCL produced ultra thin-fibers each with particular characteristics, verified and analyzed by morphology, wettability, thermal and cytotoxicity features and for bacteria colonization. Different PCL scaffold morphologies were found to be dependent on the fabrication method used. All PCL …

See List of Professors in AA Hidalgo University(Universidade Federal do Piauí)

AA Hidalgo FAQs

What is AA Hidalgo's h-index at Universidade Federal do Piauí?

The h-index of AA Hidalgo has been 7 since 2020 and 11 in total.

What are AA Hidalgo's top articles?

The articles with the titles of

Anticorrosive effect of green sulfonated PANI-Zn with epoxy for the corrosion protection of aluminum alloy 6061-T651

ITO/polymer/Al from diode-like to memory device: electroforming, multilevel resistive switching, and quantum point contact

Study of the Optoelectronic Properties of Titanium Nitride Thin Films Deposited on Glass by Reactive Sputtering in the Cathodic Cage

Surface modification of Ti6Al7Nb alloy by Al2O3 nanofilms and calcium phosphate coatings

Depositation of sodium titanate nanotubes: superhydrophilic surface and antibacterial approach

Characterization and Evaluation of Layered Bi2WO6 Nanosheets as a New Antibacterial Agent

A comparison between electrospinning and rotary-jet spinning to produce PCL fibers with low bacteria colonization

are the top articles of AA Hidalgo at Universidade Federal do Piauí.

What are AA Hidalgo's research interests?

The research interests of AA Hidalgo are: Física da Matéria Condensada

What is AA Hidalgo's total number of citations?

AA Hidalgo has 458 citations in total.

What are the co-authors of AA Hidalgo?

The co-authors of AA Hidalgo are Osvaldo N. Oliveira Jr., Antonio Gomes Souza Filho, Josué Mendes Filho, Newton Martins Barbosa Neto, Reinaldo Ruggiero, Alexandre Marletta.

    Co-Authors

    H-index: 79
    Osvaldo N. Oliveira Jr.

    Osvaldo N. Oliveira Jr.

    Universidade de São Paulo

    H-index: 70
    Antonio Gomes Souza Filho

    Antonio Gomes Souza Filho

    Universidade Federal do Ceará

    H-index: 55
    Josué Mendes Filho

    Josué Mendes Filho

    Universidade Federal do Ceará

    H-index: 26
    Newton Martins Barbosa Neto

    Newton Martins Barbosa Neto

    Universidade Federal do Pará

    H-index: 24
    Reinaldo Ruggiero

    Reinaldo Ruggiero

    Universidade Federal de Uberlândia

    H-index: 22
    Alexandre Marletta

    Alexandre Marletta

    Universidade Federal de Uberlândia

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