Toward remote-controlled valve functions via magnetically responsive capillary pore membranes

Himstedt, Heath H.; Yang, Qian; Qian, Xianghong; Wickramasinghe, S. Ranil; Ulbricht, Mathias

doi:10.1016/j.memsci.2012.08.015

Cited by 37 publications

(32 citation statements)

References 23 publications

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“…Moreover, graing poly(HEMA) on membrane substrate has been well studied with well-controlled graing degrees. [25][26][27] Fig. 3 represents the reaction scheme for graing comb-like ligands from RC membrane surfaces.…”

Section: Introductionmentioning

confidence: 99%

The architecture of responsive polymeric ligands on protein binding and recovery

2017

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Section: Introductionmentioning

confidence: 99%

The architecture of responsive polymeric ligands on protein binding and recovery

2017

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“…As emerging artificial biomimetic membranes, smart gating membranes with porous substrates and functional gates, whose permeation properties can be dramatically controlled or adjusted by the gates in response to mild chemical and/or physical stimuli in the external environments, are attracting ever-increasing interests from various fields 5 6 7 . Such smart gating membranes could find myriad applications in numerous fields including water treatment 8 9 10 , controlled release 6 11 , chemical/biological separations 12 13 , chemical sensors and valves 14 15 , tissue engineering 16 and so on. Easy fabrication, high flux, significant response and strong mechanical strength are critical for the versatility of such smart gating membranes, because these attributes ensure low cost and easy mass-production as well as satisfactory performances of membranes for practical applications.…”

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confidence: 99%

Smart gating membranes with in situ self-assembled responsive nanogels as functional gates

Luo

Xie

Liu

et al. 2015

Sci Rep

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Smart gating membranes, inspired by the gating function of ion channels across cell membranes, are artificial membranes composed of non-responsive porous membrane substrates and responsive gates in the membrane pores that are able to dramatically regulate the trans-membrane transport of substances in response to environmental stimuli. Easy fabrication, high flux, significant response and strong mechanical strength are critical for the versatility of such smart gating membranes. Here we show a novel and simple strategy for one-step fabrication of smart gating membranes with three-dimensionally interconnected networks of functional gates, by self-assembling responsive nanogels on membrane pore surfaces in situ during a vapor-induced phase separation process for membrane formation. The smart gating membranes with in situ self-assembled responsive nanogels as functional gates show large flux, significant response and excellent mechanical property simultaneously. Because of the easy fabrication method as well as the concurrent enhancement of flux, response and mechanical property, the proposed smart gating membranes will expand the scope of membrane applications, and provide ever better performances in their applications.

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“…In addition, in our earlier work, we have shown that, for nanofiltration membranes, movement of the magnetically responsive polymer chains leads to a breakup of the concentration polarization boundary layer. This, in turn, leads to an increase in the apparent rejection coefficient for partially rejected solutes [16][17][18]. It is possible that both effects are responsible for the increase in the rejection of dextran and BSA.…”

Section: Membrane Separation Performancementioning

confidence: 99%

“…When poly(2-hydroxyethyl methacrylate) (PHEMA) is grafted from the surface of nanofiltration membranes, we show that movement of the grafted polymer chains can break up concentration polarization and suppress fouling [12][13][14][15][16]. When these same magnetically responsive polymer chains are grafted from the inside pore surface of track-etched polyethylene terephthalate membranes, changes in the grafted polymer conformation lead to remote-controlled valves where a magnetic field can be used to modulate the membrane performance [17].…”

Section: Introductionmentioning

confidence: 99%

Tailoring and Remotely Switching Performance of Ultrafiltration Membranes by Magnetically Responsive Polymer Chains

Sengupta

Freeman

et al. 2020

Membranes

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Magnetically responsive ultrafiltration membranes were prepared by grafting poly(2-hydroxyethyl methacrylate) chains from the outer surface of 100-kDa regenerated cellulose ultrafiltration membranes. Surface-initiated atom transfer radical polymerization was used to graft the polymer chains. Grafting from the internal pore surface was suppressed by using glycerol as a pore-filling solvent during initiator immobilization at varied densities. Glycerol suppresses the initiator attachment to the pore surface. Polymerization times of up to four hours were investigated. Superparamagnetic nanoparticles were covalently attached to the chain end. Membrane performance was determined using bovine serum albumin and dextran as model solutes. Increasing the grafted polymer chain density and length led to a decrease in the permeate flux and an increase in the apparent rejection coefficient. In an oscillating magnetic field, movement of the grafted polymer chains led to a decrease in the permeate flux, as well as an increase in the apparent rejection coefficient of the model solutes.

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Toward remote-controlled valve functions via magnetically responsive capillary pore membranes

Cited by 37 publications

References 23 publications

The architecture of responsive polymeric ligands on protein binding and recovery

The architecture of responsive polymeric ligands on protein binding and recovery

Smart gating membranes with in situ self-assembled responsive nanogels as functional gates

Tailoring and Remotely Switching Performance of Ultrafiltration Membranes by Magnetically Responsive Polymer Chains

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