Tailoring the properties of asymmetric cellulose acetate membranes by gas plasma etching

Share/Save/Bookmark

Olde Riekerink, M.B. and Engbers, G.H.M. and Wessling, M. and Feijen, J. (2002) Tailoring the properties of asymmetric cellulose acetate membranes by gas plasma etching. Journal of Colloid and Interface Science, 245 . pp. 338-348. ISSN 0021-9797

[img]PDF
Restricted to UT campus only
: Request a copy
523Kb
Abstract:Cellulose triacetate (CTA) ultrafilters and cellulose acetate blend (CAB) desalination membranes were treated with a radiofrequency gas plasma (tetrafluoromethane (CF4) or carbon dioxide (CO2), 47¿49 W, 0.04¿0.08 mbar). Treatment times were varied between 15 s and 120 min. The plasma-treated top layer of the membranes was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and contact angle measurements to obtain information about surface structure, chemistry, and wettability, respectively. The membrane properties (e.g., permeability, selectivity, fouling) were studied by waterflux measurements, molecular weight cutoff measurements, and fouling experiments with bovine serum albumin. CO2 plasma treatment resulted in gradual etching of the membrane's dense top layer. Permeation and selectivity changed significantly for treatment times of 0¿15 min for CTA and 5¿60 min for CAB membranes. Moreover, CTA membranes were hydrophilized during CO2 plasma treatment whereas CF4 plasma treatment led to hydrophobic surfaces due to strong fluorination of the top layer. This study shows that gas plasma etching can tailor the properties of asymmetric cellulose acetate membranes by simultaneously modifying the chemistry and structure of the top layer. The low fouling properties of CTA membranes were thereby largely maintained.
Item Type:Article
Copyright:© 2002 Elsevier Science (USA)
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/38485
Official URL:http://dx.doi.org/10.1006/jcis.2001.8029
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 211010