Transport properties of thermo-responsive ion track membranes

Reber, N.; Kuchel, A; Spohr, R.; Wolf, A.; Yoshida, Minoru

doi:10.1016/s0376-7388(01)00460-4

Cited by 59 publications

(55 citation statements)

References 14 publications

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“…Similar positive thermal gating behavior [47] has been reported in previous works. [23][24][25][26][27] The results showed here present strong evidence for the successful assembly of the thoil-terminated PNIPAM brushes into the nanopore.…”

Section: Resultssupporting

confidence: 59%

“…On the one hand, these smart systems can be switched between high and low conducting states by changing conformations of the attached functional molecules in response to the environmental stimuli, including pH, [20] light, [21] ionic strength, [22] and temperature, [23] to control the amount of the fluid transport. [24][25][26][27][28] On the other hand, the preferential direction of the ion transport can be also controlled by introducing broken symmetry to the nanofluidic system, [29] either in spatial or in chemical composition, [18][19]30] known as ionic rectification, which is essentially important and ubiquitous in physiological process. [31] Therefore, in the recent years, growing interests are focusing on constructing smart nanofluidic systems with responsive ionic rectifying functions.…”

Section: Introductionmentioning

confidence: 99%

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Current Rectification in Temperature‐Responsive Single Nanopores

et al. 2010

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Herein we demonstrate a fully abiotic smart single-nanopore device that rectifies ionic current in response to the temperature. The temperature-responsive nanopore ionic rectifier can be switched between a rectifying state below 34 degrees C and a non-rectifying state above 38 degrees C actuated by the phase transition of the poly(N-isopropylacrylamide) [PNIPAM] brushes. On the rectifying state, the rectifying efficiency can be enhanced by the dehydration of the attached PNIPAM brushes below the LCST. When the PNIPAM brushes have sufficiently collapsed, the nanopore switches to the non-rectifying state. The concept of the temperature-responsive current rectification in chemically-modified nanopores paves a new way for controlling the preferential direction of the ion transport in nanofluidics by modulating the temperature, which has the potential to build novel nanomachines with smart fluidic communication functions for future lab-on-chip devices.

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Current Rectification in Temperature‐Responsive Single Nanopores

et al. 2010

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“…This is due to the complex fabrication schemes required to incorporate these materials into microfluidic manifolds. Therefore, controlling physical properties with temperature, [6,30] photon irradiation, [31,32] or specific chemical (pH, ionic strength) [33,34] stimulii would be of great benefit for rapid prototyping.…”

Section: Chemical Sensing Utilizing Bead Technologymentioning

confidence: 99%

Schizophrenic Molecules and Materials with Multiple Personalities - How Materials Science could Revolutionise How we do Chemical Sensing

Byrne¹,

Scarmagnani

Radu³

et al. 2009

MRS Proc.

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Molecular photoswitches like spiropyrans derivatives offer exciting possibilities for the development of analytical platforms incorporating photo-responsive materials for functions such as light-activated guest uptake and release and optical reporting on status (passive form, free active form, guest bound to active form). In particular, these switchable materials hold tremendous promise for microflow-systems, in view of the fact that their behaviour can be controlled and interrogated remotely using light from LEDs, without the need for direct physical contact. We demonstrate the immobilisation of these materials on microbeads which can be incorporated into a microflow system to facilitate photoswitchable guest uptake and release. We also introduce novel hybrid materials based on spiropyrans derivatives grafted onto a polymer backbone which, in the presence of an ionic liquid, produces a gel-like material capable of significant photoactuation behaviour. We demonstrate how this material can be incorporated into microfluidic platforms to produce valve-like structures capable of controlling liquid movement using light.

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“…This thermoresponsive behavior has been applied in various monolithic on-demand drug delivery designs, where release is determined either by a squeezing mechanism [13,14], or by entrapment in the collapsed state, followed by enhanced permeation in the swollen state [15,16]. To overcome the limitations of such monolithic systems, including negative thermoresponsivity and high permeation in the off-state, various hydrogel/membrane composites have been proposed to reversibly affect the diffusion rate by grafting a thermoresponsive hydrogel inside the voids [7,[17][18][19][20][21][22][23][24][25] or on top of the impenetrable solid membrane [11,24,[26][27][28]. The grafting degree determines whether the composite exhibits positive or negative thermoresponsivity, which is schematically depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%