A photo-tunable membrane based on inter-particle crosslinking for decreasing diffusion rates

Song Li, Basem Moosa, Ye Chen, Wengang Li, Niveen M. Khashab

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Functional polymeric membranes are widely used to adjust and control the diffusion of molecules. Herein, photosensitive poly(hydroxycinnamic acid) (PHCA) microspheres, which were fabricated by an emulsification solvent-evaporation method, were embedded into an ethyl cellulose matrix to fabricate composite membranes with a photo-tunable property. The photoreaction of PHCA is based on the [2 + 2] cycloaddition of cinnamic moieties upon irradiation with 365 nm light. Intra-particle crosslinking in PHCA microspheres was confirmed in the solution phase, while inter-particle crosslinking between adjacent PHCA microspheres dominated the solid membrane phase. The inter-particle crosslinking turned down the permeability of the composite membranes by 74%. To prove the applicability of the designed system, the composite membrane was coated on a model drug reservoir tablet. Upon irradiating the tablet with UV light, the original permeability decreased by 57%, and consequently the diffusion rate of the cargo (Rhodamine B) from the tablet slowed down. Most importantly, the tablet showed sustained release for over 10 days. This controllability can be further tuned by adjusting the membrane thickness. Composite membranes showed excellent processing reproducibility together with consistent mechanical properties. These results demonstrate that the incorporation of photosensitive PHCA microspheres in polymeric membranes provides a promising photo-tunable material for different applications including coating and separation. This journal is © The Royal Society of Chemistry 2015.
Original languageEnglish (US)
Pages (from-to)1208-1216
Number of pages9
JournalJ. Mater. Chem. B
Issue number7
StatePublished - 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01

ASJC Scopus subject areas

  • Biomedical Engineering
  • General Materials Science
  • General Medicine
  • General Chemistry


Dive into the research topics of 'A photo-tunable membrane based on inter-particle crosslinking for decreasing diffusion rates'. Together they form a unique fingerprint.

Cite this