Concurso para professor adjunto na UFPE em Engenharia de Reabilitação.

O Departamento de Engenharia Biomédica da UFPE está realizando concurso para professor adjunto, com regime de dedicação exclusiva para a área de Engenharia da Reabilitação. Solicitamos a ampla divulgação do mesmo.

INSCRIÇÕES: As inscrições ocorrerão no período de 12 de Fevereiro a 14 de Março de 2014, exceto sábados, domingos e feriados, para entrega da documentação exigida.

Edital de Condições Gerais: Edital Nº 05/2014,

http://www.ufpe.br/progepe/images/progepe/documentos/CCD/edital%2005%202014%20professor%20adjunto.pdf

Edital Complementar: Biomédica: Engenharia de Reabilitação

www.ufpe.br/progepe/images/progepe/documentos/CCD/edital%20complementar%20ctg%20eng%20biomedica%20reabilitacao.pdf

UFPE – Universidade Federal de Pernambuco (www.ufpe.br)

Research center studies material applied as ozone gas sensor (Text by CDMF and INCTMN)

Developing multifunctional materials, that is, chemical compounds synthesized in labs, which may be applied in several areas, is a research field increasingly explored in the chemistry departments of universities around the world. The Center for the Development of Functional Materials (CDMF), located at Universidade Estadual Paulista (UNESP), jointly with researchers from Universidade de São Paulo (USP), Universidade Federal de São Carlos (UFSCar) and Instituto de Pesquisas Energéticas e Nucleares (IPEN) have developed an original study using the chemical compound silver tungstate (Ag2WO4) as a resistive sensor to detect small amounts of ozone gas, providing an alternative to environmental solutions.

Luis Fernando Silva, researcher at CDMF, under the supervision of Professor Elson Longo, has investigated the properties of silver tungstate as an ozone gas sensor. Ozone (O3) is an oxidant gas, used in many technological applications, such as the food industry, drinking water treatment, medicine, microelectronics cleaning processes, among others. “Ozone has been successfully used to disinfect effluents, allowing a more efficient drinking water treatment. However, when there are high amounts of this gas in the atmosphere, it becomes harmful, especially to human health, causing serious conditions as headaches, burning and stinging in the eyes, difficulties to breath and lung damages”, he said.

In 2013, researchers from CDMF identified a way to stimulate the growth of nanoparticles of silver in the silver tungstate compound itself. Thereby, the material developed a number of properties that may be used in different sectors, such as health, environment, and technology.

Encouraged by this breakthrough, the researchers studied silver tungstate as a resistive gas sensor. “The preliminary results qualified this compound as a great gas sensor. In one of our trials, we identified that silver tungstate displayed an excellent performance detecting ozone. That was the first time in which this compound was used as a resistive gas sensor”, explained the researcher. The obtained results were published on the journal Nanoscale, a renowned source on the subject.

Silva also explains that following this work, the main goal will be examining the sensibility of silver tungstate when detecting other gases, such as nitrogen dioxide (NO2), ammonia (NH3), ethanol (C2H6O), or even humidity. “These are parameters that enable the potential commercialization of this material”, he stated.

The initiative results from the interaction between CDMF and the INCTMN (National Institute of Science and Technology for Nanotechnology Materials).

Exposition to ozone gas

Ozone is a gas found in the higher layers of the atmosphere, acting as a filter against the solar ultraviolet radiation that comes down to Earth. The gas is not natural where living beings live, presenting a negative impact to health. It is formed by the reactions between gases created by combustions, as in vehicles, for example.

The World Health Organization (WHO) recommends avoiding the exposition to ozone gas above 120 ppb (parts per billion). Based on this date, the constant detection and measurement of the levels of ozone contained in the atmosphere or in certain environments remains indispensable.

CAPES’s Materials Area Anniversary. Part 1.

At the end of January, 2014, the Brazilian community of Materials research celebrates an anniversary: the Materials Area of CAPES reaches its sixth year of existence. CAPES is the government agency linked to the Brazilian Ministry of Education in charge of promoting high standards for post-graduate courses in Brazil.

In fact, it was on January 30th, 2008, that CAPES’s published a press release announcing the introduction of changes to its table of areas. Such table lists the areas of knowledge and it is used in the evaluations of the post-graduation programs in Brazil. The changes disclosed in such note included the insertion of the Materials Area, which up until then did not exist, and which from then on would be a part of the Multi-disciplinary greater area, which had been recently created.

One day prior to such disclosure, an official letter from CAPES’s Evaluation Office had been sent to all coordinators of post-graduation programs previously identified as possibly being grouped into the new area. The official letter informed that a recent meeting of CAPES’s Superior Board had approved the creation of the new Materials area of evaluation, and also that physicist Lívio Amaral, a professor from the UFRGS (Federal University of the State of Rio Grande do Sul) had been appointed as the pro-tempore coordinator. In addition, the official letter asked the coordinators who deemed it to be in the interest of their programs to become connected to the new area of evaluation, to inform CAPES of their decision.

Background

In September, 2012, professor Amaral had taken part in a meeting at the headquarters of CNPq (Brazilian Council for the Scientific and Technological Development) called by Professor Celso de Melo, who was a director in the council. The theme of the meeting was the Materials Science and Engineering area, and the Advisory Boards of such body. The other participants of the meeting were the professors Glória de Almeida Soares (from COPPE-UFRJ), Elson Longo (from UFSCar) and João Marcos Alcoforado Rebello (from COPPE-UFRJ).

A document signed by the participants of the meeting pointed some problems with the evaluation of research projects in the Materials Area. To sum it up, due to the fact that there was no Advisory Board for the Materials Area at that time, the projects and other requests pertaining to Materials Science or Engineering were often appraised with debatable parameters or sent from area to area until someone was found who could evaluate them, a situation which significantly increased the number of appeals received by the CNPq and the time to reply to the requesting researcher. To solve such issue, the document proposed initially the creation of a committee with representatives from the several areas of knowledge involving Materials and also that the scientific societies with any relation to Materials were to be called to the debate, to find a solution fully backed by the technical and scientific community.

“This matter of the inclusion of a Materials area in the government fostering agencies had been considered since the mid-90s”, Lívio Amaral states. “That occurred within the context of creation of a Brazilian Materials society, having the MRS as a reference, which ended up occurring in the early 00s. At the time, there was a lot of debate in several situations, such as in the Brazilian Meetings on Condensed Matter Physics of the Brazilian Physics Society”, he adds.

In parallel, professor Amaral had been following-up on that matter within CAPES, where he was the coordinator of the Physics and Astronomy Area. According to Amaral, by means of evaluations conducted every three years, it was possible to verify that several post-graduation programs, regardless of the names they had and by which of CAPES’s areas they were encompassed, were awarding master and doctorate degrees with intellectual production in Materials. “Since, in addition to being department coordinator, I also took part in CAPES’s Technical and Scientific Council, I had the opportunity to take that entire matter to debate in such Council”, the professor  comments.

At that time, Jorge Almeida Guimarães, who would become CAPES’s president in 2004, was the coordinator of the Biological Sciences II Area and, like professor Amaral, took part in the Technical and Scientific Council and was a professor in the UFRGS. “We discussed at length the need to create two new areas, the Materials and Biotechnology areas”, Lívio Amaral tells us.

In addition, Amaral recalls that another favorable coincidence then occurred. CAPES’s president at the time was Professor Abílio Afonso Baeta Neves, who had previously been the dean of post-graduation in UFRGS when the program of post-graduation in Materials Science had been submitted to the university, by initiative from professors of the Physics department, Amaral included, and of the Engineering and the Chemistry departments. “In summary, in that scenario, the discussion regarding new areas, inside and outside the Technical and Scientific Council, was very frequent due to such circumstances”, professor Amaral sums it up.

Meeting of CAPES’s Technical and Scientific Council, at the time of professor Abílio Baeta Neves’s presidency. At the table, the third one from the right is the president; the sixth, the one speaking, is professor Jorge Guimarães; the seventh is profesor Lívio Amaral. (Picture provided by Lívio Amaral)

The decision for the creation

According to Amaral, in July, 2007, CAPES held a meeting in Brasília, to consider the possible creation of a new area of knowledge, to be called “Materials”. Representatives from several post-graduation programs were invited, including professor Lívio, who was at the time the coordinator of UFRGS’s program.

The official letter-invitation sent by CAPES’s Evaluation Office contained: “The agency has been granted to such area the importance it deserves, considering the relevance of the creation of new materials for the current science and technology. CAPES’s Superior Council, in addition, has already authorized this Office to create the area at hand. For such decision, the meeting to be held in July 31st shall be decisive, for it will allow us to conclude if such innovative measure is in the interests of the programs – and of the Brazilian science and technologies. The new area would encompass all programs that – currently divided into different areas of knowledge – highlight this theme, which is a priority for the Country and for applied sciences”.

“The meeting was, therefore, conclusive for the creation of the new area and designed the initial milestones for the same”, Amaral states. Thus, on January 25th, 2008, CAPES’s Ordinance No. 09 was published, which ordinance, in its article 3, created two new areas of knowledge, “Materials” and “Biotechnology”, and designated their pro tempore coordinators.

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List of post-graduation programs that adhered to the Materials area (as of March, 2008).

1. Program of Post-Graduation in Materials – UNIVERSIDADE DE CAXIAS DO SUL

2. Program of Post-Graduation in Materials Science – UNIVERSIDADE FEDERAL  DO RIO GRANDE DO SUL

3. Program of Post-Graduation in Materials Engineering and Science – UNIVERSIDADE FEDERAL DO CEARÁ

4. Program of Post-Graduation in Materials Science – UNIVERSIDADE FEDERAL DE PERNANBUCO

5. Program of Post-Graduation in Materials Science and Technology – UNIVERSIDADE ESTADUAL PAULISTA “JÚLIO DE MESQUITA FILHO” – UNESP-BAURÚ

6. Program of Post-Graduation in Materials Engineering – UNIVERSIDADE DE SÃO PAULO – ESCOLA DE ENGENHARIA DE LORENA

7. Program of Post-Graduation in Materials Engineering and Science – UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE

8. Program of Post-Graduation in Materials Engineering and Science – UNIVERSIDADE DE SÃO PAULO – SÃO CARLOS

9. Program of Post-Graduation in Materials Science and Technology – UNIVERSIDADE ESTADUAL PAULISTA “JÚLIO DE MESQUITA FILHO” – UNESP- CAMPUS DE ILHA SOLTEIRA

10. Program of Post-Graduation in Materials Engineering and Science – UNIVERSIDADE FEDERAL DE SANTA CATARINA.

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Featured paper: Changing the properties and morphology of graphene nanoribbons with nitrogen.

The scientific paper by members of the Brazilian community in Materials research featured this month is:

Josue Ortiz-Medina,  M. Luisa García-Betancourt,  Xiaoting Jia,  Rafael Martínez-Gordillo,  Miguel A. Pelagio-Flores,  David Swanson,  Ana Laura Elías,  Humberto R. Gutiérrez,  Eduardo Gracia-Espino,  Vincent Meunier, Jonathan Owens,  Bobby G. Sumpter, Eduardo Cruz-Silva,  Fernando J. Rodríguez-Macías,  Florentino López-Urías,  Emilio Muñoz-Sandoval, Mildred S. Dresselhaus,  Humberto Terrones,  Mauricio Terrones. Nitrogen-Doped Graphitic Nanoribbons: Synthesis, Characterization and Transport. Advanced Functional Materials 2013, 23, 3755-3762. DOI 10.1002/adfm.201202947.

Changing the properties and morphology of graphene nanoribbons with nitrogen

Multiple layers of graphene with the shape of ribbons (narrow and long) are called graphitic nanoribbons. These materials have been studied to control their properties by various methods, such as doping, in which are introduced atoms of “foreign” elements in the graphene carbon lattice.

In a study led by scientists at Pennsylvania State University with the participation of researchers from institutions in the United States, Mexico, Spain and Brazil, nitrogen-doped graphitic nanoribbons were manufactured by the chemical vapor deposition (CVD) method and showed new features, linked with the introduction of nitrogen, such as highest semiconductor performance, promising for applications in electronic devices, chemical reactivity and a very particular morphology on its edges.  The research was published in the journal Advanced Functional Materials.

“This article showed by the first time that it is possible to make doping with nitrogen on the same synthesis by CVD of graphite nanoribbons, and that you can control the level of doping during synthesis,” highlights Fernando Rodríguez-Macías, foreign visiting professor at the Brazilian Federal University of Pernambuco (UFPE) and one of the authors of the scientific paper. A Mexican national, Rodríguez-Macías came to UFPE in 2012, during his sabbatical year to work as a foreign visiting professor in the Department of Fundamental Chemistry and in the Graduate Program in Materials Science of the University. “I have prolonged my stay for another year to continue until 2014 doing collaborative studies for the production of carbon nanostructures, of bionanotechnology and toxicity of nanomaterials,” says the professor. “I am also teaching preparation and characterization of materials,” he adds.

The doped nanoribbons

The article’s authors showed that different concentrations of nitrogen generate controlled changes in material behavior. In particular, scientists have proven that the more nitrogen introduced into the structure of graphene, the most predominant the semiconductor behavior of nanoribbons. As an explanation to this phenomenon, the researchers suggested, based on theoretical calculations, that nitrogen atoms of doped nanoribbons act as scattering centers of electrons and decrease the conductive behavior of undoped graphene. “The control of doping level allows you to change the electrical properties of the nanoribbons, which can be useful for applications in transistors and other electronic devices,” says Rodríguez-Macías.

In addition, the paper also shows that the reactivity of nanoribbons can change with the doping level. Pure graphene, explains UFPE’s visiting professor, is very inert and has limited interactions with many chemical substances; on the other hand, nanoribbons doped with nitrogen are more reactive, which makes them useful for applications in sensors and catalysis.

As to the morphology, the article’s authors found that the nitrogen-doped nanoribbons have loops on their edges, uniting different graphene sheets. “This morphology is not presented by undoped graphite nanoribbons,” says Rodríguez-Macías.

This figure, sent by Professor Fernando Rodríguez-Macías, shows the nitrogen-doped graphitic nanoribbons in three scales. The scanning electron microscopy (top left corner) shows how these ribbons are made up of several layers and feature a curved surface with roughness. The transmission electronic microscopy (bottom left corner) shows that the nanoribbon layers are graphene sheets. The high resolution transmission electronic microscopy (right) shows that the layers of graphene on the nanoribbons edges form loops uniting different graphene sheets.

Collaborators

Almost all work of materials synthesis of the paper of Advanced Functional Materials was developed at Pennsylvania State University; the characterization was done in collaboration with other researchers and laboratories, reports UFPE’s visiting professor.

The participation of UFPE in the article happened through the doctoral student Miguel Angel Pelagio-Flores in the analysis and theoretical modeling of doped nanoribbons, and through professor Fernández-Macías himself, who, in addition to having participated in the discussion of results and review of the article from his office at UFPE, was doctoral advisor of the first author of the article, Josué Ortiz-Medina, while professor of a Mexican institution, IPICYT. “Ortiz-Medina did most of the experimental work of the article, besides being an important part of the characterization and theoretical studies of these new nanomaterials, when he was in exchange at Penn State in the laboratory of professor Terrones,” contextualizes the professor.

In total, 19 authors sign the article, among them MIT’s Professor Mildred Dresselhaus, reference in carbon science.

XIII SBPMat Meeting Symposia.

A: Functional hybrid interfaces: from characterization to applications. Main organizer: Welchy Leite

Cavalcanti (IFAM/Germany).

B: Advances in Functional Polymers. Main organizer: Ricardo Vinicius Bof de Oliveira (UFRGS/Brazil).

C: Magnetic Materials. Main organizer: Marcos Flavio de Campos (UFF/Brazil).

D: Organic Electronics and hybrids: materials and devices. Main organizer: Rodrigo F. Bianchi (UFOP/Brazil).

E: Sol-Gel Materials: From Fundamentals to Advanced Applications. Main organizer: Andrea S. de Camargo (USP São Carlos/Brazil).

F: Research Frontiers of Computer Simulations in Materials Science: Developments and Applications. Main organizer: Juarez L. F. Da

Silva (USP São Carlos/Brazil).

G: Anti-fouling Materials and Coatings. Main organizer: Alexander Hiroshi Kasama (PETROBRÁS/Brazil).

H: Luminescent Materials. Main organizer: Hermi F. Brito (USP/Brazil).

I: Beyond Graphene: Low-dimensional systems based on graphene and III-Nitrides. Main organizer: Caio M.C. de Castilho (UFBA/Brazil).

J: IX Brazilian Electroceramics Symposium. Main organizer: Daniel Zanetti (UFABC/Brazil).

K: Structure-Properties Relationship of Advanced Metallic Materials. Main organizer: Leonardo Barbosa Godefroid (UFOP/Brazil).

L: Current Research in Energy Storage Systems. Main organizer: Alexandre Urbano (UEL/Brazil).

M: Nanomaterials for Nanomedicine. Main organizer: Carlos Jacinto da Silva (UFAL/Brazil).

N: Surface Engineering: functional coatings and modified surfaces. Main organizer: Carlos Alejandro Figueroa (UCS/Brazil).

O: Multifunctional materials derived from clay minerals. Main organizer: Maria Gardênnia da Fonseca (UFPB/Brazil).

P: Advanced Carbon Nanostructures and Composites. Main organizer: Ana Flávia Nogueira (UNICAMP/Brazil).

Q: International Symposium on Cementitious Materials. Main organizer: Sandro Torres (UFPB/Brazil).

R: Innovation and Technology Transfer Symposium. Main organizer: Roberto Faria (USP São Carlos/Brazil).

S: Ceramic and metallic materials obtained by wet-chemical methods. Main organizer: Mary Alves (UEPB/Brazil).

Curso de verão 2014 do IFGW – Unicamp.

O curso de Verão 2014 do IFGW ocorrerá no próprio Instituto de Física “Gleb Wataghin” (IFGW) da UNICAMP em Campinas (SP) de 17 a 21 de fevereiro de 2014.

O mesmo é direcionado principalmente a alunos do último ano de graduação em Física, Matemática e Engenharias, além de alunos de pós-graduação e pesquisadores que tenham interesse em conhecer o instituto.

Os candidatos poderão solicitar no ato da inscrição auxílio financeiro para transporte e estadia, que será concedido, ou não, de acordo com a disponibilidade de recursos.

A programação temática deste ano envolverá Materiais Avançados e Técnicas de Caracterização. Serão oferecidos minicursos, palestras em tópicos avançados e visitas a laboratórios do IFGW.

Maiores informações e inscrições:

http://sites.ifi.unicamp.br/veraoifgw

veraoifgw@ifi.unicamp.br