On the Intrinsic Limits of the Convolution Method to Obtain the Crystallite Size Distribution from Nanopowders Diffraction

Autor: Roberto Ribeiro de Avillez, Fernanda Gonçalves Abrantes, Sonia Letichevsky

Publikováno v: Materials Research, Vol 21, Iss 3 (2018)

The present work briefly reviews the convolution of crystallite shape functions and discusses its experimental limitations. The diffraction from a theoretical spherical shape powder is used to exemplify the limits of the convolution procedure. Mean l

Externí odkaz: https://doaj.org/article/eea6f79d90954452921ef18d8ba56550

SYNTHESIS AND CHARACTERIZATION OF NANOCRYSTALLINE MORDENITE, FERRIERITE AND ZSM-5 ZEOLITES

Autor: SONIA LETICHEVSKY

Publikováno v: Repositório Institucional da PUC_RIOPontifícia Universidade Católica do Rio de JaneiroPUC_RIO.

PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Neste trabalho, as zeólitas mordenita, ferrierita e Z

Externí odkaz: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12172@1
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12172@2

EFFECT OF THE PREPARATION CONDITIONS ON THE CHARACTERISTICS OF THE CEO2-ZRO2 MIXED OXIDES PREPARED BY COPRECIPITATION METHOD

Autor: SONIA LETICHEVSKY

Publikováno v: Repositório Institucional da PUC_RIOPontifícia Universidade Católica do Rio de JaneiroPUC_RIO.

PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Os óxidos mistos CeO2-ZrO2 são utilizados como suporte de catalisadores automotivos devido a sua capacidade de estocar e liberar oxigênio em condições pobres ou ricas de combustível, res

Externí odkaz: http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5212@1
http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5212@2

Influence of precursor materials on the fresh state and thermo-chemo-mechanical properties of sodium-based geopolymers

Autor: Ana Carolina Constâncio Trindade, Roberto Ribeiro de Avillez, Sonia Letichevsky, Flávio de Andrade Silva

Publikováno v: Ceramics International. 48:19806-19817

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::423b31e906fb9e4c772e2518581f2723
https://doi.org/10.1016/j.ceramint.2022.03.255

A Simple Method for Low-temperature Sintering of Titania

Autor: Anna Luísa W. R. Miguel, Roberto R. de Avillez, Marlin J. Pedrozo-Peñafiel, Ricardo Q. Aucélio, Sonia Letichevsky

Publikováno v: Materials Research, Volume: 25, Article number: e20220202, Published: 07 OCT 2022
Materials Research v.25 2022
Materials research (São Carlos. Online)
Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL

A low-temperature sintering process was used to produce pellets at different temperatures using TiO2 anatase (Vetec) and P25 (Evonik) commercial powders. The initial powder was mixed with 75% acetic acid aqueous solution and pressed under 375 MPa. Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::55beee0e448baac60b68b5dcd6788acf
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392022000100366&lng=en&tlng=en