Development of a Fast Response Molecular Recognition Ion Gating Membrane

Yamaguchi, Takeo; Ito, Taichi; Sato, Takenari; Shinbo, Toshio; Nakao, Shin-ichi

doi:10.1021/ja984170b

Cited by 142 publications

(133 citation statements)

References 17 publications

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“…Environmental stimuli-responsive gating membranes exhibit permeability changes in response to external stimuli such as temperature , pH [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44], ionic strength [43][44][45][46][47][48][49], electric field [50,51], or substance species [52][53][54][55][56][57][58][59][60]. Such "smart" membranes are considered to have great potential in a wide variety of applications, including controlled drug delivery, chemical separation, water treatment, chemical sensing, and so on.…”

Section: Introductionmentioning

confidence: 99%

Gating Characteristics of Thermo‐Responsive Membranes with Grafted Linear and Crosslinked Poly(N‐isopropylacrylamide) Gates

et al. 2009

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Thermo-responsive porous membranes with grafted linear and crosslinked poly(N-isopropylacrylamide) (PNIPAM) gates are successfully prepared at temperatures above and below the lower critical solution temperature (LCST) of PNIPAM by using a plasma-induced grafting polymerization method, and the effects of operation pressure and grafting temperature on the thermo-responsive gating characteristics of the prepared membranes are investigated systematically. The fluxes of water through the grafted membranes increase simply with increasing the operation pressure no matter whether the environmental temperature is 40°C or 25°C. Under high operation pressure (e.g., higher than 0.14 MPa), the grafted linear PNIPAM gates deform to a certain extent, whereas the grafted crosslinked PNIPAM gates do not deform. For both membranes with grafted linear and crosslinked PNIPAM gates, the membranes prepared at 25°C (below the LCST of PNIPAM) show larger thermo-responsive gating coefficients than those prepared at 40°C (above the LCST of PNIPAM), which results from different distributions of grafted PNIPAM gates in the membrane pores. When the PNIPAM gates are grafted at 25°C, the grafted layer near the membrane surface is much thicker than that inside the membrane pores; on the other hand, when the PNI-PAM gates are grafted at 40°C, the grafted layer is homogeneously formed throughout the whole pore length. Both linear and crosslinked grafted PNIPAM gates in the membrane pores exhibit stable and repeatable thermo-responsive "open-close" switch performances under the operation pressure of 0.26 MPa. The results in this study provide valuable guidance for designing, fabricating, and operating thermo-responsive gating membranes with desirable performances.

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Section: Introductionmentioning

confidence: 99%

Gating Characteristics of Thermo‐Responsive Membranes with Grafted Linear and Crosslinked Poly(N‐isopropylacrylamide) Gates

et al. 2009

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“…[32][33][34][35] In this work, the commercially available 4-aminobenzo-15-crown-5-ether, which was presumed to form a stable 'host-guest' complex with sodium ion (Na + ), was chosen. 44 The formation of the silane coupling reagent with the 15-crown-5-ether was attained by the reaction of 4¢-aminobenzo-15-crown-5-ether with (3-isocyanatopropyl)triethoxysilane.…”

Section: Resultsmentioning

confidence: 99%

“…[27][28][29][30][31][32][33][34][35][36][37] The use of PSQ seems to be convenient for the introduction of such additional responsive functions. In particular, the silane coupling reagent with the low-molecular-weight organic group, which provides the thermoresponsive property, is expected to be a more useful material for the formation of the multi-functional PSQ.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of thermoresponsive polysilsesquioxane with methoxyethylamide group and crown ether

Matsuoka

Yamamoto

Moriya

et al. 2010

Polym J

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A polysilsesquioxane with a bis(2-methoxyethyl)amide group and 15-crown-5-ether ring (MCPSQ) was newly prepared by the co-condensation of silane coupling reagents, which were obtained from (3-isocyanatopropyl)triethoxysilane and the corresponding amines with the respective groups. MCPSQ showed the expected amphiphilic and thermoresponsive properties. The behaviors of hydrophobic aggregation of MCPSQ in the aqueous solutions containing the chlorides of lithium, potassium and sodium reflected the selective ion recognition property due to the presence of the crown ether. The highest aggregation temperature of 32 1C was observed in the solution containing sodium ion as expected from the coordination ability of the crown ether group. With the use of the sodium salt of 4-phenylazobenzoic acid as an additive in the aqueous solution of MCPSQ, the aggregation temperature was changed according to the photochemical isomerization of the phenylazobenzoate group. The results show the efficient coordination of the sodium salt with the crown ether ring.

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“…[1][2][3] Only a few studies of stimuli-responsive membranes that respond to a target molecule have been undertaken, in spite of their potential applications in biochemical and biomedical fields. [4][5][6] For example, a molecular recognition ion gating membrane was prepared by grafting a temperature-responsive polymer with crown ether moieties onto the surface of a porous polyethylene film by plasma graft copolymerization. 5,6 The molecular recognition ion gating membrane spontaneously controlled the solution flux in response to a specific ion, such as Ba 2+ , which can be recognized by the crown ether moiety.…”

Section: Introductionmentioning

confidence: 99%

Controlled permeation of model drugs through a bioconjugated membrane with antigen–antibody complexes as reversible crosslinks

Miyata

Asami

Okita

et al. 2010

Polym J

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Development of a Fast Response Molecular Recognition Ion Gating Membrane

Cited by 142 publications

References 17 publications

Gating Characteristics of Thermo‐Responsive Membranes with Grafted Linear and Crosslinked Poly(N‐isopropylacrylamide) Gates

Gating Characteristics of Thermo‐Responsive Membranes with Grafted Linear and Crosslinked Poly(N‐isopropylacrylamide) Gates

Synthesis of thermoresponsive polysilsesquioxane with methoxyethylamide group and crown ether

Controlled permeation of model drugs through a bioconjugated membrane with antigen–antibody complexes as reversible crosslinks

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