Polymer-Modified Opal Nanopores

Schepelina, Olga; Zharov, Ilya

doi:10.1021/la061170d

Cited by 59 publications

(55 citation statements)

References 52 publications

(74 reference statements)

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“…Firstly, the surface charge can be retained by the anions adsorption onto the gold pore wall, [37][38] which provide possibility to achieve the ionic rectifying nanopores. Secondly, compared to the commonly used surface-initiated atom transfer radical polymerization (SI-ATRP), [39] the properties of the pre-synthesized PNIPAM molecules can be well determined and characterized prior to the attachment onto the nanopore. We will discuss the two issues in detail in the following paragraphs.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

Current Rectification in Temperature‐Responsive Single Nanopores

et al. 2010

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“…We were also able to prepare polymer-modified colloidal films where molecular transport has been controlled by sterics in response to temperature and pH. [37][38][39] Recently, we developed a free-standing colloidal membrane (nanofrit) with large surface area. [40] These membranes are prepared by sintering, [41,42] which causes the silica spheres to fuse to one another.…”

Section: Introductionmentioning

confidence: 99%

pH‐Responsive Nanoporous Silica Colloidal Membranes

Schepelina

Poth

Zharov

2010

Adv Funct Materials

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Free‐standing colloidal membranes (nanofrits) with varied thickness and nanopore size are fabricated and modified with pH‐responsive poly(2‐(dimethylamino)ethyl methacrylate) brushes. The polymer‐modified nanofrits demonstrate excellent gating behavior for molecular diffusion: in the presence of acid, the diffusion rate of positively charged species significantly decreases. Increasing the polymer length and membrane thickness and decreasing the nanopore size leads to the complete acid‐controlled gating of the membranes.

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“…[18] Alternatively, in this study, the polymer brushes were further modified, which allowed to derive a width of desired functional groups. We have previously reported on the synthesis of sulfonated polystyrene gel, which is greatly conducive to a favorable formation of functional composites within the gel.…”

Section: Resultsmentioning

confidence: 99%

A General Approach toward Opal–Inverse Opal Interlocked Materials

Liu

Jin

et al. 2007

Macromol. Rapid Commun.

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Opal–inverse opal interlocked composites consisting of opals of hollow spheres with window channels interlocked, have displayed new properties. A facile and general method has been reported to synthesize the ordered composites. Polymer shells are first grown onto the surface of a silica sphere of an opal template by ATRP, which is followed by a sequential modification of the shells resulting in functional groups. Composite shells are favorably synthesized within the functional polymer shells. After the removal of silica opal templates, opal–inverse opal interlocked structures with varied compositions of polymers, inorganic materials, and carbon are achieved.

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Polymer-Modified Opal Nanopores

Cited by 59 publications

References 52 publications

Current Rectification in Temperature‐Responsive Single Nanopores

Current Rectification in Temperature‐Responsive Single Nanopores

pH‐Responsive Nanoporous Silica Colloidal Membranes

A General Approach toward Opal–Inverse Opal Interlocked Materials

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