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Alumina membranes were modified using a SiO2 sol-gel process to mitigate membrane fouling. The formation of a SiO2 coating layer resulted in slightly narrowed pore sizes and reduced pure water permeability. Due to low isoelectric points, SiO2-coated membranes have a strong negative surface charge (−130mV at pH 6.5), which results in the presence of electrostatic repulsion forces against humic acid...
Alumina wet foams were dip-coated on the surfaces of pre-sintered alumina substrates, dried, and then joined by diffusion bonding via solid-state diffusion without an interlayer during the sintering process. As a coating layer, the alumina wet foam was stabilized by alumina particles that were rendered partially hydrophobic by valeric acid as a short chain amphiphile. The porosity and average cell...
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