Formation and Characterization of Fully Aromatic Polyamide Thin Films on Solid Substrates
Open AccessReverse osmosis has become one of the most important membrane technologies for desalination, however, membrane fouling and scaling has been a serious problem for membrane systems, they reduce water flux and membrane lifespan. The study of the principle of mineral scaling on membrane surface and search for strategies to minimize the scaling is very important for the development of RO membrane technology.Membrane surface properties have important influence on mineral scaling behavior. The modification of membrane properties can change the extent of mineral scaling on the membrane surface, for example changing surface functional groups and surface charges can minimize the mineral scaling caused by particles with specific charges or chemical properties, and providing less surface roughness can reduce the accumulation of mineral particles.In this thesis, glass, mica and silica QCM-D sensor are used as substrate, fully aromatic polyamide layer is formed via spin-assisted coating, manual coating and interfacial polymerization. In order to characterize the surface properties of the formed polyamide layer, ATR-FITR measurement is used to detect surface chemistry composition, and AFM imaging technology is used to detect surface morphology.The results show that fully aromatic polyamide was successfully formed on glass substrate via interfacial polymerization, and on silica QCM-D sensor via manual mLbL coating. The spin-assisted method can provide smoother surface than interfacial polymerization. Spin coating process can be a useful tool to form polyamide layer on membrane surface for future research.
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