A sedimentation study to optimize the dispersion of alumina nanoparticles in water

Cerâmica

S. Manjula²  S. Mahesh Kumar¹  A. M. Raichur¹  G. M. Madhu²  R. Suresh²  M. A. Lourdu Anthony Raj² 

[1] ,R. V. College of Engineering Department of Chemical Engineering ,India

关键词: alumina nanoparticles;    sedimentation;    iso-electric point;    bio-surfactant JBR215;    darvan C.;    nanopartícula de alumina;    sedimentação;    ponto isoélétrico;    bio-surfactante JBR215;    darvan C.;   

DOI  :  10.1590/S0366-69132005000200009

来源: SciELO

【 摘 要 】

Sedimentation studies have been carried out to optimize the dispersion conditions of aqueous alumina nanopowder suspensions with or without dispersants (ammonium salt of polymethacrylic acid or rhamnolipids at 15%). Different dispersant dosages, solid loadings, pulp densities and pH values were examined. The iso-electric point (IEP) of the alumina nanopowder was found to be pHiep= 9.2. The experiments revealed that the polymethacrylic acid was more effective as dispersant than rhamnolipids in a wide range of pH at all solid-loading conditions tested. Optimum dispersant dosages for polymethacrylic acid and rhamnolipids to achieve maximum stability of alumina nanodispersion at iso-electric point were found to be 9.25 mg/g and 57.75 mg/g solids, respectively.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License