Surface engineering of polymer membranes via mussel-inspired chemistry

Surface-independent one-pot chelation of copper ions onto filtration membranes to provide antibacterial properties

“…To prevent the formation of copper (II) hydroxide precipitation, the DOPA solution containing Cu 2+ is acidic at pH 4.5, at which DOPA could not polymerize to form PDA from the reported self-polymerization of DOPA only occurring at alkaline condition with air or oxygen as an oxidant. 12b, 13 However, in the presence of Cu 2+ , DOPA solution turned to dark brown over time even at pH 4.5, and the PDA was deposited on membrane coupons upon immersion in DOPA solution for 60 minutes since their colors all changed to dark, shown in Figure 1 a, regardless of their membrane materials and their forms in flat sheet or hollow fiber. Scanning electron microscopy (SEM) was used to observe the surface morphologies of membrane coupons before and after PDA deposition ( Figure S1 and Figure 1 b).…”

“…12 The previous studies have demonstrated a thin and highly hydrophilic polydopamine (PDA) coating could be formed onto a wide range of substrate surfaces via the self-polymerization of DOPA, regardless of the substrate materials and their surface properties. 13 Furthermore, the formed PDA coating contains many functional groups including catechol, amine, and imine, and serves as the anchors for the firmly loading of copper ions. Very recently, PDA assisted Cu (II) ions immobilization onto titanium surface was reported to achieve outstanding antibacterial performance against Gram-negative E. coli and Grampositive S. aureus.…”

Biomimetic surface modification of polypropylene by surface chain transfer reaction based on mussel-inspired adhesion technology and thiol chemistry

“…More importantly, the resultant polydopamine (PDA) film can act as a platform for easy and diverse secondary reactions to immobilize different functional groups [28][29][30][31][32][33]. It affords an opportunity to create a facial and versatile pathway for surface functionalization of PP.…”

“…In this study, based on the mussel-inspired adhesion technology [27][28][29][30][31][32][33] and the well-known high chain-transfer feature of thiol compounds [34], biomimetic surface modification of PP is conducted via surface chain transfer reaction (transferring radicals from the solution to surface-bonded thiol groups and re-initiating the polymerizationon PP surface) by using 2-methacryloyloxyethylphosphorylcholine (MPC) as a hydrophilic monomer mimicking the cell outer membrane structure and 2,2-azobisisobutyronitrile (AIBN) as initiator in ethanol. The resultant cell outer membrane mimetic structure surface (PP-PMPC) is expected to assume both good interfacial adhesion and blood compatibility.…”

A multilayer gold nanoparticle-polydopamine hybrid membrane-modified indium tin oxide electrode for selective sensing of dopamine in the present of ascorbic acid

“…The fabrication and broad applications of PDA membranes have rapidly advanced in recent years, and this trend clearly reveals the significance and the intense interest of scientific research to PDA [29]. The primary advantage of PDA is that it can be easily deposited on wide range of materials, including noble metals, oxides, polymers, and semiconductors [30][31][32].…”