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    Smart membranes with pH-responsive control of macromolecule permeability

    Year: 2017

    Journal: J. Membr. Sci., Volume 537, SEP 1, page 255–262

    Authors: Tufani, Ali; Ince, Gozde Ozaydin

    Organizations: TUBITAK (The Scientific and Technological Research Council of Turkey) Career Development Program [112M315]; TUBA (Turkish Academy of Sciences) Young Scientist Award Program

    Keywords: Initiated chemical vapor deposition; AAO track-etch membrane; pH responsive polymer; Bovine serum albumin permeation

    Utilization of membranes for separation of macromolecules has gained wide interest in the last decade, especially after the development of smart membranes with tunable properties for improved separation performance. In this work, we fabricated hybrid membranes with variable pore sizes that depend on the pH of the environment. Hybrid membranes were prepared by conformally coating the pore walls of anodic aluminum oxide (AAO) templates with the pH sensitive poly(methylacrylic acid-co-ethylene glycol dimethacrylate) (p(MAA-co-EGDMA)) polymer using initiated chemical vapor deposition (iCVD). Performance of the membranes was investigated under different pH conditions using nanoparticles, polyacrylic acid (PAA) and BSA protein as permeates. Reduced pore sizes at pH 9 due to swollen polymer decreased the permeability of permeates compared to that at pH 3. In addition to size, charge interactions between the polymer surface and permeates affected the permeation. At high pH values, permeation of BSA was reduced due to reduced pore size and the electrostatic interactions with the polymer.
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