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Dive into the research topics where Vânia R. Salvini is active.

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Featured researches published by Vânia R. Salvini.


Materials Research-ibero-american Journal of Materials | 1999

Prediction of Ceramic Foams Permeability Using Ergun's Equation

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

In situ α-alumina hydrophobization dynamics at acid pH: effectiveness limitations of short-chain amphiphilic molecules

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

How accurate is Darcy's law for refractories

M. D. M. Innocentini; A. R. F. Pardo; Vânia R. Salvini; Victor C. Pandolfelli


Ceramics International | 2012

Extension of Hasselman's thermal shock theory for crack/microstructure interactions in refractories

Vânia R. Salvini; Victor C. Pandolfelli; Richard C. Bradt


American Ceramic Society Bulletin | 2000

Optimizing permeability, mechanical strength of ceramic foams

Vânia R. Salvini; M. D. M. Innocentini; Victor C. Pandolfelli


Ceramics International | 2015

Developing nano-bonded refractory castables with enhanced green mechanical properties

M. Nouri-Khezrabad; A.P. Luz; Vânia R. Salvini; F. Golestani-Fard; Hamid Reza Rezaie; Victor C. Pandolfelli


Ceramics International | 2017

Analysis and modeling of the pore size effect on the thermal conductivity of alumina foams for high temperature applications

Pedro I.B.G.B. Pelissari; Ricardo Afonso Angélico; Vânia R. Salvini; Diogo O. Vivaldini; V. C. Pandolfelli


Ceramics International | 2013

Why foams containing colloidal hydrophilic particles are unstable

Diogo O. Vivaldini; A.P. Luz; Vânia R. Salvini; Victor C. Pandolfelli


International Journal of Applied Ceramic Technology | 2016

Nontoxic Processing of Reliable Macro‐Porous Ceramics

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

Nanoporous Refractory Insulating: Solution or Illusion?

Diogo O. Vivaldini; Vânia R. Salvini; Arnadeu A.C. Mourão; Victor C. Pandolfelli

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Victor C. Pandolfelli

Federal University of São Carlos

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A.P. Luz

Federal University of São Carlos

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Diogo O. Vivaldini

Federal University of São Carlos

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V. C. Pandolfelli

Federal University of São Carlos

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D. Spinelli

University of São Paulo

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M. D. M. Innocentini

Federal University of São Carlos

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Arnadeu A.C. Mourão

Federal University of São Carlos

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Paulo Renato Orlandi Lasso

Empresa Brasileira de Pesquisa Agropecuária

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Pedro I.B.G.B. Pelissari

Federal University of São Carlos

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