Fig. 2: Morphological and structural features of PA membranes. | Nature Communications

Fig. 2: Morphological and structural features of PA membranes.

From: Molecular manipulation of polyamide nanostructures reconciles the permeance-selectivity threshold for precise ion separation

Fig. 2

a, b Surface FESEM images. c, d 2D and 3D AFM images. e, f Cross-sectional TEM images. Top: P-M. Bottom: DP-M. g Pore radius distribution of PA membranes obtained by PEG rejection tests (the inset illustrates the geometric standard deviation). h Molecular dynamics (MD) simulations of the fractional free volume (FFV) of PA layers (left). The dark blue and gray colors represent the voids between the polymer chains and the space occupied by the polymer skeleton, respectively. Representative porous molecular structures of the DP-M and P-M PA networks (right). i MD simulations of the pore radius distribution of the PA nanofilms. j Zeta potential as a function of pH. k Summary of the MWCO, water contact angle (CA), root mean square roughness (Rq), FFV, polyamide layer thickness, and zeta potential (ZP) at pH = 6 for DP-M and P-M.

Back to article page