Preparation and characterization of polyimide membranes containing Ag nanoparticles in pores distributing on one side

Polysulfone ultrafiltration membranes impregnated with silver nanoparticles show improved biofouling resistance and virus removal

“…Nanosilver has been incorporated into cellulose acetate (Chou et al, 2005), polyimide (Deng et al, 2008), polyamide (Damm et al, 2007), and poly(2-ethyl-2-oxazoline (Kang et al, 2006) membranes on the lab scale. However, the long-term effectiveness of the incorporated nAg in preventing biofouling during continuous filtration has not been addressed.…”

“…Additionally, silver lost from the membrane could be regenerated through the reduction and deposition of silver salts, such as AgN0 3 (Deng et al, 2008).…”

“…Rapid silver depletion could be addressed by future research focusing on better nAg fixation techniques that concentrate the silver near the surface of the membrane (where it is most effective) and encapsulate the silver to slow the release rate. Because eventual silver depletion may be unavoidable, the effectiveness of nAg regeneration by reductive deposition of silver salts should be further explored (Chou et al, 2005;Deng et al, 2008). While nAgimpregnated membranes would not guarantee protection against silver-resistant bacteria strains, they may ensure antimicrobial activity against a wide variety of bacteria and viruses and provide long-term protection against biofouling and viral penetration of water filtration membranes.…”

Fabrication of flexible nanostructured silver-polymer films for sensors and bio-warfare or bacterial treatment and conducting gold-silver-polymer film for flexible electronics

“…Unfortunately, the fabrication processes of nanofibers or nanotubes are often costly and complicated. Among nanomaterials, silver nanoparticles have antibacterial or antibio-warfare activities [32][33][34][35], thus Ag nanoparticle-polymers have been an emerging field of research [36][37][38][39][40]. Flexibility of such polymer films can extend their application to a wider range [17].…”

Characterization of antibacterial polyethersulfone membranes using the respiration activity monitoring system (RAMOS)

“…Such membranes could be composed of cellulose (Jung et al, 2009), cellulose acetate (Chou et al, 2005), polysulfone (Taurozzi et al, 2008;Zodrow et al, 2009), polyethersulfone (Basri et al, 2010;Basri et al, 2011), polyacrylnitrile (PAN) (Yu et al, 2003), polyimide (Deng et al, 2008) and poly(2-ethyl-2-oxazoline) (Kang et al, 2006). The main disadvantage of this membrane fabrication method is that silver is homogeneously distributed over the whole membrane matrix while it is needed solely at the surface, where it comes in contact with bacteria.…”