Zobrazeno 1 - 10
of 295
pro vyhledávání: '"Jair C. C."'
Publikováno v:
ACS Omega, Vol 9, Iss 46, Pp 45759-45773 (2024)
Externí odkaz:
https://doaj.org/article/02c6c7795f99488891974f19d8bc9844
Autor:
Djanyna V. C. Schmidt, Tainara L. G. Costa, Daniel F. Cipriano, Carla S. Meireles, Cleocir J. Dalmaschio, Jair C. C. Freitas
Publikováno v:
ACS Omega, Vol 9, Iss 39, Pp 40882-40896 (2024)
Externí odkaz:
https://doaj.org/article/5898484c7f2d44ed8058acae60ca3726
Autor:
F. Mendoza-Villa, Noemi-Raquel Checca-Huaman, Tainara L. G. Costa, Jair C. C. Freitas, Juan A. Ramos-Guivar
Publikováno v:
Toxics, Vol 12, Iss 4, p 252 (2024)
In this work, the synthesis and structural, thermal, vibrational, morphological, and electronic characterization of 2D-like pure graphene oxide (GO) and phosphorus-containing graphene oxide (GOP) sheets were investigated. The average thicknesses of G
Externí odkaz:
https://doaj.org/article/985466fb439c4e1cbe7c6c82090b65fc
Autor:
Mariana A. Vieira, Tainara L. G. Costa, Gustavo R. Gonçalves, Daniel F. Cipriano, Miguel A. Schettino, Elen L. da Silva, Andrés Cuña, Jair C. C. Freitas
Publikováno v:
C, Vol 9, Iss 2, p 60 (2023)
The reduction of graphene oxide (GO) by means of thermal and/or chemical treatments leads to the production of reduced graphene oxide (rGO)—a material with improved electrical conductivity and considered a viable and low-cost alternative to pure gr
Externí odkaz:
https://doaj.org/article/1ac93cda976b4eef9a8315d41e08dbbb
Autor:
Lyane M. Darabian, Tainara L. G. Costa, Daniel F. Cipriano, Carlos W. Cremasco, Miguel A. Schettino, Jair C. C. Freitas
Publikováno v:
C, Vol 8, Iss 4, p 48 (2022)
Graphene quantum dots (GQDs) are nanosized systems that combine beneficial properties typical of graphenic materials (such as chemical stability, biocompatibility and ease of preparation from low-cost precursors) with remarkable photoluminescent feat
Externí odkaz:
https://doaj.org/article/20400a9e9c8d4d8d9a3233572791ef88
Publikováno v:
Química Nova, Vol 37, Iss 10, Pp 1657-1662 (2014)
Rice husk ash (RHA) is used as a silica source for several purposes, among them to obtain metal catalysts, as was done in this work. The catalysts were characterized by chemisorption, physisorption, thermal analyses (TG, DSC), X-ray diffraction, X-ra
Externí odkaz:
https://doaj.org/article/c0edea2173cf44f5ad14c726635720d1
Autor:
André F. Constantino, Valdemar Lacerda Jr., Reginaldo B. dos Santos, Sandro J. Greco, Renzo C. Silva, Álvaro C. Neto, Lúcio L. Barbosa, Eustáquio V. R. de Castro, Jair C. C. Freitas
Publikováno v:
Química Nova, Vol 37, Iss 1, Pp 10-17 (2014)
To choose among the variety of oleaginous plants for biodiesel production, the oil content of several matrices was determined through different low-field ¹H nuclear magnetic resonance (NMR) experiments with varied pulse sequences, namely single-puls
Externí odkaz:
https://doaj.org/article/189badbcee0c4456b9da6d12d05decff
Autor:
Jair C. C. Freitas, Daniel F. Cipriano, Carlos G. Zucolotto, Alfredo G. Cunha, Francisco G. Emmerich
Publikováno v:
Journal of Spectroscopy, Vol 2016 (2016)
Solid-state 13C nuclear magnetic resonance (NMR) spectroscopy was used in this work to analyze the physical and chemical properties of plasma blacks and carbon deposits produced by thermal cracking of natural gas using different types of plasma react
Externí odkaz:
https://doaj.org/article/1b4b4ff3f5674fb28d76ecd2ef3caa9c
Autor:
Ana Brígida Soares, Paulo Roberto Nagipe da Silva, Alexandre Moura Stumbo, Jair C. C. Freitas
Publikováno v:
Química Nova, Vol 35, Iss 2, Pp 268-273 (2012)
Silica obtained from rice husk after acid leaching and calcination was compared to commercial silica as a catalyst support. CaO and SnO2 catalysts were prepared by impregnation and tested in the transesterification of soybean oil and the esterificati
Externí odkaz:
https://doaj.org/article/ba6116499f6c4cc48e218727b6fc99df
Autor:
Milton K. MorigakiI, Elias M. da Silva, Carlos V. P. de Melo, Jamile R. Pavan, Renzo C. Silva, Armando Biondo, Jair C. C. Freitas, Gilson H. M. Dias
Publikováno v:
Química Nova, Vol 32, Iss 7, Pp 1812-1817 (2009)
FeBr2 has reacted with an equivalent of mnt2- (mnt = cis-1,2-dicyanoethylene-1,2-dithiolate) and the α-diimine L (L = 1,10'-phenantroline, 2,2'-bipyridine) in THF solution, and followed by adding of t-butyl-isocyanide to give [Fe(mnt)(L)(t-BuNC)2] n
Externí odkaz:
https://doaj.org/article/6d35798a96ae4b26a40548c355a3b230