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Use of atomic force microscopy and solid-state NMR spectroscopy to characterize structure-property-performance correlation in high-flux reverse osmosis (RO) membranes by Seung-Yeop Kwak; Dae Woo Ihm is a Engineering article available to read on EtoBox.

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Morphology and relaxation studies were very effective in understanding of the reverse osmosis (RO) permeation for the high- ̄ux reverse osmosis (RO) membranes which were the thin-®lm-composite (TFC) type based on aromatic polyamide of m-phenylene diamine (MPD)/trimesoyl chloride (TMC). Microscopic morphology analyzed by atomic force microscopy (AFM) together with ®eld-emission scanning electron microscopy (FE-SEM) and molecular relaxation characterized by solidstate 1 H nuclear magnetic resonance (NMR) spectroscopy revealed an important factor crucially affecting the enhancement of RO permeability. The proton spin-lattice relaxation in the rotating frame for the aromatic polyamides in their wet state (i.e., saturated with D 2 O) has been shown to be sensitive to the water ̄ux and played a signi®cant role in enhancing the membrane permeability, regardless of the surface features. The aromatic polyamide possessing relatively shorter spin-lattice relaxation times in the rotating frame, T 1& , provided a TFC membrane with higher RO permeation, and vice versa.

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Author

Seung-Yeop Kwak; Dae Woo Ihm

Publisher

Elsevier BV

Published

1999

Language

EN

Field

Engineering (Physical Sciences)