Do the soft-etched and UV-track membranes actually have uniform cylindrical subnanometer channels?

Apel, P. Yu.; Blonskaya, I.V.; Іванов, О. М.; Kristavchuk, Olga; Nechaev, A. N.; Olejniczak, K.; Orelovich, O.L.; Полежаева, О. А.; Dmitriev, S. N.

doi:10.1016/j.radphyschem.2022.110266

Cited by 9 publications

(4 citation statements)

References 44 publications

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“…1b). However, the effects of irradiation energy, 32,33 UV exposure, 34 and the procedure for removing radiolysis products 27,35 on the channel size are still not clear, not even for their applications. 36 We first investigated the conductance as a function of the salt concentration C, ranging from 1 mM to 3 M KCl at pH 5.0.…”

Section: Resultsmentioning

confidence: 99%

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Surface-charge governed ionic blockade in angstrom-scale latent-track channels

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Surface-charge governed ionic blockade in angstrom-scale latent-track channels

et al. 2023

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“…Multi-nanochannels were fabricated with a tip diameter of 10 nm and base diameter of 650 nm by asymmetrical etching on the PET films, as shown in Figure S4. Carboxylic groups (COOH) existed on the inner surface of the conical nanochannels due to the radiation and photolysis processes. , Figure a illustrates the modification process of the cone-shaped PET multi-nanochannels with GHK by covalent bonding, and the surface hydrophobicity was evaluated through contact angle (CA) measurements. GHK contains two amino groups: one in the lysine spacer and the other in the glycine terminal.…”

Section: Resultsmentioning

confidence: 99%

Ultrasensitive and Label-Free Detection of Copper Ions by GHK-Modified Asymmetric Nanochannels

An,

Zhang,

Yang

et al. 2023

Anal. Chem.

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Artificial solid-state nanochannels have garnered considerable attention as promising nanofluidic tools for ion/molecular detection, DNA sequencing, and biomimicry. Recently, nanofluidic devices have emerged as cost-effective detection tools for heavy metal ions by modifying stimuli-responsive materials. In this work, high-purity glycyl-L-histidyl-L-lysine (GHK) peptide is synthesized by using 7-diphenylphosphonooxycoumarin-4-methanol (DPCM) as a protecting group and auxiliary carrier by homogeneous synthesis of photocleavable groups. Subsequently, we developed a GHKmodified asymmetric nanochannel nanofluidic diode by covalently attaching the GHK peptide to the inner surface of the nanochannels. This modification facilitated specific recognition and ultra-trace level detection of Cu 2+ ions, achieving a detection limit of 10 −15 M. Due to the robust complexing ability between Cu 2+ and GHK peptide, the GHK-modified asymmetric nanochannels can form GHK-Cu complexes on the inner surface of nanochannels when Cu 2+ passes through the nanochannels. This results in changes of current−potential (I−V) properties, which facilitated Cu 2+ detection. Theoretical calculations confirmed the high affinity of the GHK peptide for Cu 2+ , thereby ensuring excellent Cu 2+ selectivity. To evaluate the applicability of our system for detecting Cu 2+ in real-world scenarios, we analyzed the concentration of Cu 2+ in tap water. The GHK-Cu complexes could be dissociated by adding EDTA to the solution, enabling the regeneration and reuse of this ultrasensitive and label-free Cu 2+ detection system using GHK-modified asymmetric multinanochannels. We anticipate that the GHK-modified asymmetric nanochannels will find future applications in the label-free detection of Cu 2+ in domestic water.

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“…Polyimide track membranes are films in which there are many through pores, most often cylindrical and of the same size [9][10][11]. There are a number of works in which the creation of polymeric composites was carried out by deposition of metal salts in pores of polymer nuclear membranes [12,13], although the issue of deposition of silica filler in the pores of the given membranes remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

Effect of a Tetraethoxysilane Hydrolysis Reaction Catalyst on the Precipitation of Hydrolysis Products in the Pores of a Polyimide Track Membrane

et al. 2023

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This paper presents the results of obtaining a composite film based on polyimide track membranes filled with a silica filler, although the issue of the deposition of this filler in the pores of the given membranes remained unexplored. The filler was obtained by hydrolysis of tetraethoxysilane using an alkaline and acid catalyst. This paper presents the results of the effect of the tetraethoxysilane hydrolysis reaction catalyst on the precipitation of hydrolysis products in the pores of the polyimide track membrane. The factors influencing the formation of silicon oxide nanofibers within the matrix template (polyimide track membrane) are determined. It was found that the use of an acid catalyst provides the highest rates of filling, while when using an alkaline catalyst, the filling is practically not observed, and only single pores are filled. The properties of the composite film obtained were investigated. SEM images of the surface and chip of the composite while using alkaline and acid catalyst are presented. The spatial structure of composite films based on track membranes was investigated by FTIR spectroscopy. The hydrolysis of tetraethoxysilane in an acid medium significantly decreases the optical density index of the membranes and simultaneously increases their light transmission index. The greatest changes are observed in the range of 500–1000 nm, and there are no detectable changes in the range of 340–500 nm. When using an alkaline catalyst, there is not the same significant decrease in the relative optical density index D.

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Do the soft-etched and UV-track membranes actually have uniform cylindrical subnanometer channels?

Cited by 9 publications

References 44 publications

Surface-charge governed ionic blockade in angstrom-scale latent-track channels

Surface-charge governed ionic blockade in angstrom-scale latent-track channels

Ultrasensitive and Label-Free Detection of Copper Ions by GHK-Modified Asymmetric Nanochannels

Effect of a Tetraethoxysilane Hydrolysis Reaction Catalyst on the Precipitation of Hydrolysis Products in the Pores of a Polyimide Track Membrane

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