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Aquaporin Based Biomimetic Membrane for Water Desalination
Ahmed FUWAD,Hyunil RYU,Sun Min KIM,Tae-Joon JEON 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Nature has a very sophisticated water transportation system via specialized proteins called aquaporins or water channels. Biomimetic membranes emerge as the next generation water purification technology with high water flux and low energy consumption. Despite its substantial advantages, low water permeability compared to theoretical performance and requirement of the specialized environmental conditions for transportation and storage are the major barriers in commercialization of these membranes. In this work, we reported a highly permeable ceramic substrate-based aquaporin membrane, the porous anodized aluminum oxide (AAO) substrate was functionalized using polydopamine coating and subsequently aquaporin biomimetic membranes were stabilized using electrokinetic coating on the surface. The was subjected to forward osmosis water desalination and it shows exceptional high water desalination performance with water permeability of ~ 27.8 LMH and high membrane selectivity of 0.1 g/l. Furthermore, the membrane was subjected to cryodesiccation which enhances its shelf life and transportability without need of specialized environmental conditions.
An electrokinetic approach to fabricating aquaporin biomimetic membranes for water purification
Fuwad, Ahmed,Ryu, Hyunil,Lee, Jun-Hee,Kim, Daejoong,Yoo, Yeong-Eun,Kim, Young-Rok,Kim, Sun Min,Jeon, Tae-Joon Elsevier 2019 Desalination Vol.452 No.-
<P><B>Abstract</B></P> <P>Membrane technology has been dominating the water desalination industry for decades due to its high efficiency and reliability. However, conventional membrane materials present performance limitations; thus, the demand for the development of new material is high. In recent years, aquaporin biomimetic membranes have emerged as a next-generation water desalination platform based on natural phenomena. Aquaporin is a natural water-selective protein that possesses exceptional water selectively and permeability properties. However, aquaporin must be embedded in an amphiphilic structure, such as a cell membrane, and the mimetic structure and stability of these environments represent key factors for successful water purification systems. Herein, we report an electrokinetic approach that stabilizes the aquaporin-containing membranes on a porous substrate under an applied electric field, resulting in an exceptionally stable and uniform biomimetic membrane on a solid support. The surface morphological analysis shows that the liposomes retained their perfect shape and size and did not present fusion or aggregation. Moreover, under forward osmosis, our membrane presents a salt rejection rate that reached 97.8±0.7% with 7.45±0.62Lm<SUP>−2</SUP>h<SUP>−1</SUP> (LMH) of water flux.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An electrokinetic approach that stabilizes aquaporin biomimetic membranes on a porous substrate is demonstrated in this work. </LI> <LI> Charged proteoliposomes are concentrated on the pores under an applied electric field </LI> <LI> Forward osmosis was applied to the aquaporin biomimetic membranes, resulting in high salt rejection </LI> <LI> An electrokinetic method can add great versatility to water purification systems using aquaporin-functionalized biomimetic membranes </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
High performance hybrid film for energy harvesting from water droplets
Ahmed Fuwad,Hyunil Ryu,Tae-Joon Jeon,Sun Min Kim 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The increase advancement in technology and industry exponentially increases the global energy requirements, thus new renewable energy sources have been identified for energy harvesting to fulfill these requirements. We reported a high-performance hybrid film to harvest energy from water droplets by mixing two different dielectric polymers, polydimethylsiloxane (PDMS) and polytetrafluoroethylene (PTFE). The energy harvesting performance of the hybrid film was enhanced by optimizing different parameters such as mixing ratio, film thickness, surface morphology and roughness and contact area. As a result, the film shows high output performance of 50V with high power output of 1.8mW against a suitable resistance, which can light up 20 LEDs and can charge 1μF capacitor in 40secs.