Microstructure and thermo-responsive behavior of poly(N-isopropylacrylamide) brushes grafted in nanopores of track-etched membranes

Alem, Halima; Duwez, Anne‐Sophie; Lussis, Perrine; Lipnik, P.; Jonas, Alain M.; Demoustier‐Champagne, Sophie

doi:10.1016/j.memsci.2007.09.036

Cited by 134 publications

(121 citation statements)

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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: 58%

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: 58%

Current Rectification in Temperature‐Responsive Single Nanopores

et al. 2010

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“…N -isopropylacrylamide (NIPAM, Acros) was dissolved in dichloromethane and purifi ed by two extractions with an aqueous sodium hydroxide (NaOH) solution (0.1 M ) followed by two extractions with Milli-Q water and by drying over anhydrous sodium sulfate (Na 2 SO 4 ) before polymerization. [ 21 ] 2-Bromo-2-methylpropanoyl (BMBP, Acros) and pyridine (Acros) were used as received.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Thermoresponsive Nano‐Confined Polymer Brushes by AFM‐Based Force Spectroscopy

Radji

Alem

Demoustier‐Champagne

et al. 2012

Macro Chemistry & Physics

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International audiencePNIPAM polymer brushes are synthesized in nanopores of track-etched membranes. The internal structure of these nano-confined brushes is studied by AFM force spectroscopy experiments as a function of the synthesis conditions. The approach force vs. distance profiles are fitted using the Alexander-de Gennes model to determine the grafting density, and the worm-like chain model is used to estimate the chain length from the retract profiles. The grafting density for brushes synthesized within 80 nm pores is ten times lower than that obtained in 330 nm pores. For the same polymerization time, the chain lengths are much lower if the synthesis is carried out in small pores. The elastic properties of the brushes are also directly related to the confinement conditions

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“…This method has been shown to control the reaction and to obtain high densities of surface-grafted polymer. 25 Several surface 'grafting from' techniques have been reported in the literature, including chemical grafting, 25 plasma, 24,26 radiation 13,19,27,28 and photoinduced grafting. 29,30 A previously reported plasma-induced grafting technique 24 was chosen for the grafting of PNIPAM to the PCTEPMs because it presented several advantages to incorporating the desired properties into the PC membrane.…”

Section: Synthesis Pathway To Incorporate Pnipam Into Pctepmsmentioning

confidence: 99%

Bioinspired synthesis of optically and thermally responsive nanoporous membranes

Morones‐Ramírez

2013

NPG Asia Mater

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The development of porous membranes that can rapidly change flow rates in response to external, noninvasive stimuli has broad technological applications for areas ranging from biomedical devices to architecture. Environmentally responsive membranes have a fundamental role in the development of devices used in chemical sensors, biological sorters, sequencing, separations, high-throughput medical devices and labs on a chip. The design and engineering of these responsive porous membranes have been achieved through the coupling of porous membranes with polymeric materials that can change their physical conformation in response to pressure, heat, pH or different chemical entities. Inspired by the phototropic growth of coleoptiles and the light-mediated mechanism that plants use to open their stomata, in this work, light-responsive porous membranes were engineered, mathematically modeled and synthesized. This biologically inspired approach led to a state-of-the-art design technique and a device that outperforms its natural counterpart and is capable of reversibly controlling flow rates from 0.001 to 0.035 ml s À1 cm À2 in less than a few minutes using the noninvasive stimulus of light. We envision that the polymeric responsive membranes and the platform synthesis technique employed in this manuscript for their fabrication could be utilized in a broad range of applications and will have a great impact on the fields of fluid handling, biomedical high-throughput devices, sensors, medicine and other fields of chemistry, biology and mechanical engineering.

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Microstructure and thermo-responsive behavior of poly(N-isopropylacrylamide) brushes grafted in nanopores of track-etched membranes

Cited by 134 publications

References 55 publications

Current Rectification in Temperature‐Responsive Single Nanopores

Current Rectification in Temperature‐Responsive Single Nanopores

Investigation of Thermoresponsive Nano‐Confined Polymer Brushes by AFM‐Based Force Spectroscopy

Bioinspired synthesis of optically and thermally responsive nanoporous membranes

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