Fabrication of different pore shapes by multi-step etching technique in ion-irradiated PET membranes

Mo, Dan; Liu, J.D.; Duan, Jinglai; Yao, Huijun; Latif, Hamid; Cao, Dong; Chen, Y.H.; Zhang, S.X.; Zhai, Pengfei

doi:10.1016/j.nimb.2014.04.011

Cited by 40 publications

(21 citation statements)

References 25 publications

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“…In this experiment, single nanochannels with a diameter from ∼3 to ∼400 nm were prepared in a 12 μm thick polyethylene terephthalate (PET) membrane using a well-developed track-etching technique (Supporting Information Figures S1–S3). − As a result of etching, the channel surface contained carboxyl groups at a density of ∼1 nm –2 , which endows the surface with a regulated charge property by the electrolyte solution. , …”

Section: Resultsmentioning

confidence: 99%

Electrostatic-Charge- and Electric-Field-Induced Smart Gating for Water Transportation

et al. 2016

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Regulating and controlling the transport of water across nanochannels is of great importance in both fundamental research and practical applications because it is difficult to externally control water flow through nanochannels as in biological channels. To date, only a few hydrophobic nanochannels controlling the transport of water have been reported, all of which use exotic hydrophobic molecules. However, the effect of electrostatic charges, which plays an indispensable role in membrane proteins and dominates the energetics of water permeation across aquaporins, has not gained enough attention to control water transport through a solid-state nanochannel/nanopore. Here, we report electrostatic-charge-induced water gating of a single ion track-etched sub-10 nm channel. This system can directly realize the gating transition between an open, conductive state and a closed, nonconductive state by regulating the surface charge density through a process that involves alternating capillary evaporation and capillary condensation. Compared to the introduction of exotic hydrophobic molecules, water gating controlled by electrostatic charges is simple, convenient, and effective. Such a system anticipates potential applications including desalination, controllable valves, and drug delivery systems.

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Section: Resultsmentioning

confidence: 99%

Electrostatic-Charge- and Electric-Field-Induced Smart Gating for Water Transportation

et al. 2016

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“…As a result, the switchable and controllable states between the opening and closing of the channel can be realized. In particular, the recyclable voltage-gated potassium-activated nanochannel was based on the biomimetic funnel-shaped nanochannel that was fabricated from an asymmetric two-step track-etching technique in a 12-μm-thick PET membrane (Supporting Information, Figure S1). , The cross-sectional scanning electron microscope (SEM) image (Figure b) showed that the prepared funnel-shaped nanochannel was composed of a conical segment of about 7.5 μm and a cylindrical segment of about 4.5 μm. The base (large) opening was about 600 nm, and the tip (small) opening was about 15 nm (Supporting Information, Figure S2).…”

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confidence: 99%

Biomimetic Voltage-Gated Ultrasensitive Potassium-Activated Nanofluidic Based on a Solid-State Nanochannel

Kai

Xiao

Chen³

et al. 2017

Langmuir

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In living organism, voltage-gated potassium channels play a crucial role and are largely responsible for various vital movements. For life science, it is significant and challenging to imitate and control the potassium ion transportation with a convenient artificial system. Here, we reported a voltage-gated ultrasensitive potassium-activated nanofluidic system using a 4'-aminobenzo-18-crown-6 molecule-functionalized funnel-shaped solid-state nanochannel. The switchlike property between open and closed states can be tuned freely by reversible immobilization and the release of potassium ions. By virtue of good reversibility and excellent stability, this system can potentially be applied in controlled drug release and biosensors.

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“…To date, porous materials have been formed through a variety of methods such as thermally induced phase separation, evaporation induced phase separation, phase inversion and track-etching [20][21][22]. For example, Jian Zhao et al proposed a method to fabricate microporous material using the solvent evaporation-including separation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ionic Radius in Metal Nitrate on Pore Generation of Cellulose Acetate in Polymer Nanocomposite

2020

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To prepare a porous cellulose acetate (CA) for application as a battery separator, Cd(NO 3 ) 2 ·4H 2 O was utilized with water-pressure as an external physical force. When the CA was complexed with Cd(NO 3 ) 2 ·4H 2 O and exposed to external water-pressure, the water-flux through the CA was observed, indicating the generation of pores in the polymer. Furthermore, as the hydraulic pressure increased, the water-flux increased proportionally, indicating the possibility of control for the porosity and pore size. Surprisingly, the value above 250 LMH (L/m 2 h) observed at the ratio of 1:0.35 (mole ratio of CA: Cd(NO 3 ) 2 ·4H 2 O) was of higher flux than those of CA/other metal nitrate salts (Ni(NO 3 ) 2 and Mg(NO 3 ) 2 ) complexes. The higher value indicated that the larger and abundant pores were generated in the cellulose acetate at the same water-pressure. Thus, it could be thought that the Cd(NO 3 ) 2 ·4H 2 O salt played a role as a stronger plasticizer than the other metal nitrate salts such as Ni(NO 3 ) 2 and Mg(NO 3 ) 2 . These results were attributable to the fact that the atomic radius and ionic radius of the Cd were largest among the three elements, resulting in the relatively larger Cd of the Cd(NO 3 ) 2 that could easily be dissociated into cations and NO 3 − ions. As a result, the free NO 3 − ions could be readily hydrated with water molecules, causing the plasticization effect on the chains of cellulose acetate. The coordinative interactions between the CA and Cd(NO 3 ) 2 ·4H 2 O were investigated by IR spectroscopy. The change of ionic species in Cd(NO 3 ) 2 ·4H 2 O was analyzed by Raman spectroscopy.Polymers 2020, 12, 981 8 of 9 Polymers 2020, 12, x FOR PEER REVIEW 8 of 9 Scheme 1. Comparison of pore generation by species of metal salts in cellulose acetate.

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Fabrication of different pore shapes by multi-step etching technique in ion-irradiated PET membranes

Cited by 40 publications

References 25 publications

Electrostatic-Charge- and Electric-Field-Induced Smart Gating for Water Transportation

Electrostatic-Charge- and Electric-Field-Induced Smart Gating for Water Transportation

Biomimetic Voltage-Gated Ultrasensitive Potassium-Activated Nanofluidic Based on a Solid-State Nanochannel

Effect of Ionic Radius in Metal Nitrate on Pore Generation of Cellulose Acetate in Polymer Nanocomposite

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