Maximal pore size in UF membranes

Elizabeth Arkhangelsky, Aviv Duek, Vitaly Gitis

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The ultrafiltration membrane rejection capability is most often characterized by molecular weight cut-off (MWCO). The value is found by rejection of organic solutes and the evaluation of particle retention requires a conversion of either MWCO to pore size or particle diameter to molecular weight. The conversion affects the accuracy of reported values and results in a gap between reported and measured retentions.We suggest a novel, simple and effective pore size test based on synthesis and membrane transfer of rigid nanoparticles. Gold and silver 3-50nm monodispersions had delivered a comprehensive pore size distribution including d 100, a pore diameter for which a membrane has a 100% retention capability. The maximal pore size in UF membrane structure can hardly be detected with other methods although it is much needed for precise separation analysis.The d 100 values in tested UF membranes vary between 40nm and 50nm depending on the membrane material. The polymer membranes are more flexible than the ceramics and their d 100 is usually much higher than MWCO. The d 100 increases with high transmembrane pressure or after oxidative chemical cleaning. For some membranes the d 100 values can be correlated with d 90 but not with d 50.

Original languageEnglish
Pages (from-to)89-97
Number of pages9
JournalJournal of Membrane Science
Volume394-395
DOIs
Publication statusPublished - Mar 15 2012
Externally publishedYes

Fingerprint

Pore size
membranes
Membranes
porosity
molecular weight
Molecular weight
Molecular Weight
cut-off
rejection
chemical cleaning
Chemical cleaning
membrane structures
Membrane structures
Ultrafiltration
Silver
Gold
Ceramics
Particle Size
Polymers
Nanoparticles

Keywords

  • Aquasols
  • Molecular separation
  • Monodispersed nanoparticles
  • Pathogens
  • Porous materials

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

Cite this

Maximal pore size in UF membranes. / Arkhangelsky, Elizabeth; Duek, Aviv; Gitis, Vitaly.

In: Journal of Membrane Science, Vol. 394-395, 15.03.2012, p. 89-97.

Research output: Contribution to journalArticle

Arkhangelsky, Elizabeth ; Duek, Aviv ; Gitis, Vitaly. / Maximal pore size in UF membranes. In: Journal of Membrane Science. 2012 ; Vol. 394-395. pp. 89-97.
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