Molecular Structure of Aromatic Reverse Osmosis Polyamide Barrier Layers | Zendy

Qinyi Fu | Zendy; Nisha Verma | Zendy; Hongyang Ma | Zendy; Francisco J. MedellínRodríguez | Zendy; Ruipeng Li | Zendy; Masafumi Fukuto | Zendy; Christopher M. Stafford | Zendy; Benjamin S. Hsiao | Zendy; B. M. Ocko | Zendy

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Molecular Structure of Aromatic Reverse Osmosis Polyamide Barrier Layers

Author(s) -

Qinyi Fu,

Nisha Verma,

Hongyang Ma,

Francisco J. MedellínRodríguez,

Ruipeng Li,

Masafumi Fukuto,

Christopher M. Stafford,

Benjamin S. Hsiao,

B. M. Ocko

Publication year - 2019

Publication title -

acs macro letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.966

H-Index - 92

ISSN - 2161-1653

DOI - 10.1021/acsmacrolett.9b00077

Subject(s) - polyamide , reverse osmosis , aramid , materials science , chemical engineering , osmosis , membrane , chemistry , polymer chemistry , composite material , biochemistry , engineering , fiber

The molecular structures of polyamide barrier layers in reverse osmosis membranes, made by interfacial polymerization of m -phenylenediamine and trimesoyl chloride under different reaction and post-treatment conditions, were characterized by grazing incidence wide-angle X-ray scattering (GIWAXS). The molecular backbone packing is consistent with two different aromatic molecular packing motifs (parallel and perpendicular) with preferential surface-induced orientation. The results suggest that the perpendicular, T-shaped, packing motif (5 Å spacing) might be associated with optimal membrane permeance, compared with the parallel packings (3.5-4.0 Å spacings).

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