Membrane structure and surface morphology impact on the wetting of MD membranes

Elena Guillen-Burrieza, Amelia Servi, Boor S. Lalia, Hassan A. Arafat

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

The hydrophobicity of an MD membrane is inferred from the liquid entry pressure (LEP) which it can withstand before it gets wet. The membranes used in MD are vastly different from one another, not only in terms of materials, pore sizes and thicknesses, but also in terms of their morphologies and structures. Very few LEP models can be found in the literature. Yet, the experimental validity of these models has not been widely assessed. In this study, we assessed the ability of the existing models to predict the LEP of membranes made via different synthesis pathways in order to give insight into the role of an MD membrane[U+05F3] structural and morphological features on its wetting. Five distinctly different membranes were coated with a conformal polymer layer via the iCVD technique, in order to standardize their surface material and neutralize any effects of surface chemistry on their wetting. We first examined the predictability of LEP for these membranes by existing LEP models and found that the models fail in most of the cases. Then, the influences of the membranes[U+05F3] structural features on their wettability were analyzed and presented through the examination of an indicator (. B'; defined as the ratio between the experimentally measured LEP and that predicted by the capillary model). These features include surface roughness, surface porosity, pore shape, thickness and contact angle. Strong influence of such parameters on the wetting behavior of the membranes was found, proving that membrane structure does play a role in membrane wetting. The results suggest preferable characteristics that can help increase the LEP in hydrophobic membranes.

Original languageBritish English
Pages (from-to)94-103
Number of pages10
JournalJournal of Membrane Science
Volume483
DOIs
StatePublished - 1 Jun 2015

Keywords

  • Liquid entry pressure
  • Membrane distillation
  • Membrane structure
  • Modeling
  • Wetting

Fingerprint

Dive into the research topics of 'Membrane structure and surface morphology impact on the wetting of MD membranes'. Together they form a unique fingerprint.

Cite this