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ARTIGOS RECENTES - MICROSCOPIA ELETRÔNICA E MICROANÁLISES


Artigo

AVALIAÇÃO DA EFICIÊNCIA FOTOTÉRMICA DE ÓXIDOS DE GRAFENO REDUZIDOS COM DIFERENTES DIMENSÕES

Isabela A. A. Bessa; Mikaelly O. B. Sousa; Fernanda D. Marques; Elisa Q. C. da Costa; Ana Beatriz C. Souza; Dayenny L. D'Amato; Camille C. de Mello; Diego O. da Costa ; Wilson S. Nascimento; Johnnys S. Hortêncio; Bráulio S. Archanjo; Célia M. Ronconi

Different exfoliation methods were applied to obtain reduced graphene oxide (rGO) with varied lateral sizes. Photothermal studies under near-infrared (NIR) irradiation showed efficient heat generation. Sheet size had minimal influence on the photothermal performance.

http://dx.doi.org/10.21577/0100-4042.20250231

Publicado online: outubro 14, 2025
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Total access: 187

O que o potencial de circuito aberto pode nos informar sobre a resistência à corrosão de ligas de alumínio?

João Victor de S. AraujoI,*; Zehbour PanossianII; Hercílio G. MeloIII; Isolda CostaI

The evolution of open circuit potential (OCP) over time was monitored to evaluate corrosion resistance of aluminium alloys. Localized attack occurred even at more noble potentials. This highlights the limitations of using OCP as a standalone technique for corrosion resistance assessment.

http://dx.doi.org/10.21577/0100-4042.20250229

Publicado online: outubro 10, 2025
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Total access: 167

Scanning electron microscopy: an essential tool in the investigation of cement for oil wells

Rafael A. VenturaI; Eduardo J. C. LinsII; Júlio C. O. FreitasI; Antonio E. MartinelliII,*

The graphical abstract illustrates the use of scanning electron microscopy (SEM) to investigate oil well cement microstructures. Representative SEM images reveal hydration products, carbonation phases, and morphological changes under various conditions.

http://dx.doi.org/10.21577/0100-4042.20250227

Publicado online: outubro 8, 2025
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Total access: 148

In situ fe doped anodized tio2 nanotubes: characterization and photocurrent response

Gustavo R. S. PaulaI; Andréia R. C. CarneiroII; Leandro A. SantosIII; Dalila C. SicupiraII; Rosa M. R. JunqueiraI*

The Graphical Abstract consists of three scanning electron microscopies obtained in the analysis of TiO2 nanotubes synthesized in the presence and absence of iron ions.

http://dx.doi.org/10.21577/0100-4042.20250224

Publicado online: outubro 6, 2025
PDF

Total access: 169

Simple and green production of lignin nanoparticles using ethanol-water mixtures and ultrasonication

Eduardo G. F. de AlmeidaI; Lucas G. P. TienneII; Braulio S. ArchanjoIII; Felipe S. AlencastroIV; Tiago A. BalbinoI; Renata A. SimãoI*

Two solvent compositions (70 and 90% ethanol, v/v in water) and varying sonication times (0-2 h) were evaluated to investigate their effects on lignin nanoparticle formation, morphology, and size.

http://dx.doi.org/10.21577/0100-4042.20250223

Publicado online: outubro 2, 2025
PDF

Total access: 248

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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