Vânia R. Salvini
Federal University of São Carlos
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Featured researches published by Vânia R. Salvini.
Materials Research-ibero-american Journal of Materials | 1999
M. D. M. Innocentini; Vânia R. Salvini; Álvaro Macedo; V. C. Pandolfelli
SiC-Al2O3 ceramic foams with 30 to 75 pores per linear inch (ppi) were used to access the application of pore size obtained by image analysis to estimate the cellular materials permeability through Erguns equation. Samples were sliced and the pore size distribution, cross-sectional porosity and pore density were evaluated as a function of the slice thickness based on optical and X-ray computerized tomography acquired images. The average pore sizes were used to calculate permeability constants (k1 and k2) of Erguns equation, which were compared to those experimentally obtained under water flow. Results indicated that the optical diameter distribution was very sensitive to the number of pore layers. Deviation between experimental and calculated values depended on the slice thickness. Nevertheless, the introduction of pore size obtained by image analysis into Erguns equations seems to give fair results to assess the permeability of ceramic foams.
Materials Research-ibero-american Journal of Materials | 2013
Diogo O. Vivaldini; A.P. Luz; Vânia R. Salvini; V. C. Pandolfelli
The present work highlights that α-alumina hydrophobicity (attained by the in situ modification of its surface properties with water soluble organic monoacids) cannot be increased by using molecules with low acidity (pKa) values due to the alumina zeta potential profile at pHs below approximately 4. In order to certify this statement, the effects of short-chain fatty acids and fluorinated ones on the alumina contact angle (θe) with water were analyzed. It is also pointed out that the θe values derived from the experiments carried out using fluorinated acids are the highest possible when monoacid surfactants are added in α -alumina suspensions in acidic pH. This result indicates that there is another constraint to the in situ hydrophobization procedure, which was not previously elucidated or fully settled in literature.
American Ceramic Society Bulletin | 1999
M. D. M. Innocentini; A. R. F. Pardo; Vânia R. Salvini; Victor C. Pandolfelli
Ceramics International | 2012
Vânia R. Salvini; Victor C. Pandolfelli; Richard C. Bradt
American Ceramic Society Bulletin | 2000
Vânia R. Salvini; M. D. M. Innocentini; Victor C. Pandolfelli
Ceramics International | 2015
M. Nouri-Khezrabad; A.P. Luz; Vânia R. Salvini; F. Golestani-Fard; Hamid Reza Rezaie; Victor C. Pandolfelli
Ceramics International | 2017
Pedro I.B.G.B. Pelissari; Ricardo Afonso Angélico; Vânia R. Salvini; Diogo O. Vivaldini; V. C. Pandolfelli
Ceramics International | 2013
Diogo O. Vivaldini; A.P. Luz; Vânia R. Salvini; Victor C. Pandolfelli
International Journal of Applied Ceramic Technology | 2016
Vânia R. Salvini; Paulo Renato Orlandi Lasso; A.P. Luz; Victor C. Pandolfelli
Proceedings of the Unified International Technical Conference on Refractories (UNITECR 2013) | 2014
Diogo O. Vivaldini; Vânia R. Salvini; Arnadeu A.C. Mourão; Victor C. Pandolfelli