Redox-responsive polymeric membranes via supermolecular host–guest interactions

Advanced functional polymer materials

“…By simply blending stimuli-responsive materials into PES, a membrane with redox-responsive hydraulic permeability was fabricated for the first time by introducing a reversible redoxresponsive system based on the host-guest complex between ferrocene and b-cyclodextrin. 635 As a result, the water flux of the membrane with 18.3 wt% redox-responsive materials was 270 mL m À2 mmHg À1 h À1 in the original state, which increased up to 1022 mL m À2 mmHg À1 h À1 in the oxidation state and decreased to 538 mL m À2 mmHg À1 h À1 in the reduction state. Changes in the pore size and porosity of the modified membrane has outstanding potential for application in chemical detection and biological treatments, as shown in Fig.…”

Macrocycles-assisted polymeric self-assemblies fabricated by host–guest complexation and their applications

“…Over the years, various neutral and charged organic molecular/ polymeric guests have been successfully synthesized, which exhibit high selectivity and good binding affinity towards macrocyclic hosts. [39][40][41][42][43] The binding affinity of the host-guest complexations can be fine-tuned by various stimuli-responsive factors, such as light, enzyme, redox, pH, temperature, reactive oxygen species (ROS), and ions. Thus, based on the variety of stimuli-responses and the mode of reversibility of the host-guest interactions, MPs can be specifically designed and constructed towards intended applications.…”

Advanced Materials for Polymeric Ultrafiltration Membranes Fabrication and Modification

“…24(11), 1591-1601.) Shi et al (2015) synthesized ferrocene and β-cyclodextrin grafted PES. The two functionalized PES were blended with pristine PES to form a membrane, and the two functional PES interacted with each other by host-guest interactions (Figure 20.9).…”

“…The two functionalized PES were blended with pristine PES to form a membrane, and the two functional PES interacted with each other by host-guest interactions (Figure 20.9). By cyclic oxidating and reducing process, the permeability of the membrane could be significantly changed (Shi et al, 2015) For the surface morphology of the membranes (Figure 20.10), the pristine PES membrane (M-0) showed a smooth surface while the modified PES membrane (M-5) showed a rough surface, which was FIGURE 20.8 Surface and cross-sectional SEM images of complex membrane: untreated membrane (a and d), after oxidation by 10 mM Fe(ClO 4 ) 3 aqueous solution (b and e), and then following reduction by 10 mM ascorbic acid in aqueous solution (c and f). Scale bar: 1 μm.…”