Toward Microcapsule-Embedded Self-Healing Membranes

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• 作者：Sang-Ryoung Kim ; Bezawit A. Getachew ; Seon-Joo Park ; Oh-Seok Kwon ; Won-Hee Ryu ; André D. Taylor ; Joonwon Bae ; Jae-Hong Kim
• 刊名：Environmental Science & Technology Letters
• 出版年：2016
• 出版时间：May 10, 2016
• 年：2016
• 卷：3
• 期：5
• 页码：216-221
• 全文大小：533K
• 年卷期：0

文摘

We herein report the first instance of a self-healing water treatment membrane that restores its water flux and particle rejection properties autonomously. The self-healing membrane is fabricated by embedding microcapsules with a polyurethane shell and an isophorone diisocyanate core within a conventional poly(ether sulfone) membrane. A dual-surfactant system and polydopamine coating were used to control the size of these microcapsules and avoid capsule buckling. When the membrane structure is physically damaged, the microcapsules release a reactive isocyanate healing agent that reacts with the surrounding water to form a polyurea matrix that plugs the damage. The self-healing was found to recover the water flux and particle rejection of the membrane to 103 and 90% of the original membrane’s performance, respectively. The results of this study show that microcapsule-embedded membranes are a promising approach to fabricating versatile, next-generation membranes that can self-heal.