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Dr. Edgar Sanches
Laboratório de Polímeros Nanoestruturados (NANOPOL), Federal University of Amazonas-UFAM, Manaus 69067-005, AM, Brazil
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Academic Career Length
13Years (2014-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications1 January 2015 in Journal of Nanomaterials
Journal Article
ESEdgar Sanches
Edgar SanchesSAScarlat F. Alves
Scarlat F. Alves
JSJuliana C. Soares
Juliana C. Soares
ASArnaldo M. Da Silva
Arnaldo M. Da Silva
CSCristina G. Da Silva
Cristina G. Da SilvaHFHidembergue O. Da Frota
Hidembergue O. Da Frota
+1
Polypyrrole (PPY) powder was chemically synthesized using ferric chloride (FeCl3) and characterized by X‐ray diffraction (XRD), Le Bail Method, Fourier Transform Infrared Spectrometry (FTIR), and Scanning Electron Microscopy (SEM). XRD pattern showed a broad scattering of a semicrystalline structure composed of main broad peaks centered at 2θ = 11.4°, 22.1°, and 43.3°. Crystallinity percentage was estimated by the ratio between the sums of the peak areas to the area of amorphous broad halo due to the amorphous phase and showed that PPY has around 20 (1)%. FTIR analysis allowed assigning characteristic absorption bands in the structure of PPY. SEM showed micrometric particles of varying sizes with morphologies similar to cauliflower. Crystal data (monoclinic, space group P 21/c, a = 7.1499 (2) Å, b = 13.9470 (2) Å, c = 17.3316 (2) Å, α = 90 Å, β = 61.5640 (2) Å and γ = 90 Å) were obtained using the FullProf package program under the conditions of the method proposed by Le Bail. Molecular relaxation was performed using the density functional theory (DFT) and suggests that tetramer polymer chains are arranged along the “c” direction. Average crystallite size was found in the range of 20 (1) Å. A value of 9.33 × 10−9 S/cm was found for PPY conductivity.
16 August 2018 in Journal of the Science of Food and Agriculture
Journal Article
LSLaiane S. Silva
Laiane S. Silva
JMJosiana M. Mar
Josiana M. Mar
SASidney G. Azevedo
Sidney G. Azevedo
MRMaxwaldo S. Rabelo
Maxwaldo S. Rabelo
JBJaqueline A Bezerra
Jaqueline A Bezerra
ESEdgar Sanches
Edgar Sanches +6
15 March 2024 in Communications in Soil Science and Plant Analysis
Journal Article
HSHelder B. E. Sales
Helder B. E. SalesACAdriano de Souza Carolino
Adriano de Souza CarolinoRNRonald de Aguiar Nunes
Ronald de Aguiar NunesCMCélio M. A. Macalia
Célio M. A. MacaliaCRCamila M. Ruzo
Camila M. RuzoESEdgar Sanches
Edgar Sanches +5
1 September 2020 in Materials Letters
Journal Article
LOLarissa Medeiros de Oliveira
Larissa Medeiros de Oliveira
Robert Matos
Pedro Henrique CampeloESEdgar Sanches
Edgar SanchesHFHenrique D. da Fonseca Filho
Henrique D. da Fonseca Filho
12 March 2020 in Journal of the Science of Food and Agriculture
Journal Article
JFJayne A Figueiredo
Jayne A FigueiredoALAmanda M. T. Lago
Amanda M. T. LagoJMJosiana M. Mar
Josiana M. MarLSLaiane S. Silva
Laiane S. SilvaESEdgar Sanches
Edgar SanchesSBSoraia V. Borges
Soraia V. Borges +4
1 January 2015 in Advances in Materials Science and Engineering
Journal Article
ESEdgar Sanches
Edgar SanchesACAdriano de S. Carolino
Adriano de S. Carolino
ASAmanda L. dos Santos
Amanda L. dos Santos
EFEdson G. R. Fernandes
Edson G. R. Fernandes
DTDaniela M. Trichês
Daniela M. Trichês
YMYvonne Mascarenhas
Yvonne MascarenhasCeramic nanocomposites constituted by a matrix ofα-Al2O3microparticles reinforced by polyaniline emeraldine-salt form (PANI-ES) nanoparticles were prepared byin situpolymerization and characterized structural and morphologically. Peaks related to both materials were observed through XRD technique: PANI-ES presented peaks at= 8.9, 14.9, 20.8, 25.3, 27.1, and 30.0° and inα-Al2O3phase peaks were found at= 25.6, 35.2, 37.9, 43.5, 52.6, 57.6, and 68.1°. Nanocomposite crystallinity percentage was estimated around 70%. SEM showed a polymerization of PANI-ES over alumina plates. By Le Bail method it was observed that PANI-ES andα-Al2O3have crystallite average size around, respectively, 41 and 250 Å. By FTIR analysis characteristic absorption bands of both materials were identified. Additional bands indicating new chemical bonds were not observed, suggesting that nanocomposite was formed by physical deposition. Nanocomposite DC electrical conductivity was found around 0.24 S/cm (against S/cm for pure PANI-ES), showing an increase of about 1,300 times compared to the pure PANI-ES at room temperature. Thus, this paper showed that both materials have kept its original structural characteristics and exhibited high electrical conductivity when combined in nanocomposite form.
About Me
Since 2013, I have been a professor (currently adjunct II) at the department of physics at the Federal University of Amazonas - DF/UFAM. I am accredited as a permanent professor in the graduate programs in physics (PPGFIS - since 2013), chemistry (PPGQ - since 2015), and materials science and engineering (PPGCEM - since 2014) at UFAM. I have been coordinator of the Laboratory of Nanostructured Polymers (NANOPOL - @nanopol_ufam) since 2014, having worked on research that addresses (i) synthesis and structural characterization of conjugated polymers and nanocomposites; (ii) development of biodegradable polymeric particles that carry natural actives; (iii) stabilization of encapsulated systems; (iv) extraction, characterization and encapsulation of essential oils and (v) evaluation of the bioactivity of encapsulated systems. I have been the leader of the Nanotechnology Group in Natural Products (NANONAT - CNPq) of CNPq since 2014. I served as coordinator of the graduate program in materials science and engineering at UFAM (2017-2021). I was awarded a CNPq Level 2 Productivity Scholarship (physics and astronomy) in 2014, and in 2020 I was promoted to Level 1D (physics and astronomy). I was the winner of the 2021 FAPEAM Award in the Outstanding Researcher category of the State of Amazonas (exact and earth sciences).