Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration

Komatsu, Natsumi; Nakamura, Motonori; Ghosh, Souparno; Kim, Daeun; Chen, Haoze; Katagiri, Atsuhiro; Yomogida, Yohei; Gao, Weilu; Yanagi, Kazuhiro; Kono, Junichiro

doi:10.1021/acs.nanolett.9b04764

Cited by 46 publications

(54 citation statements)

References 14 publications

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“…The analysis showed that the neat SWCNT film was composed of intertwined bundles of SWCNTs arranged in an isotropic fashion as expected for material prepared by unconstrained vacuum filtration. Spontaneous alignment of SWCNTs occurs only when special conditions are established, e.g., filtration rate is limited to a few mL/h of the dispersion [32,33], which was not the case herein. Regarding purity, no obvious signs of contamination were discerned in the material.…”

Section: Resultsmentioning

confidence: 84%

Effective Doping of Single-Walled Carbon Nanotubes with Polyethyleneimine

Rdest

Janas

2020

Materials

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More and more electrically conducting materials are required to sustain the technological progress of civilization. Faced with the performance limits of classical materials, the R&D community has put efforts into developing nanomaterials, which can offer sufficiently high operational parameters. In this work, single-walled carbon nanotubes (SWCNTs) were doped with polyethyleneimine (PEI) to create such material. The results show that it is most fruitful to combine these components at the synthesis stage of an SWCNT network from their dispersion. In this case, the electrical conductivity of the material is boosted from 249 ± 21 S/cm to 1301 ± 56 S/cm straightforwardly and effectively.

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Section: Resultsmentioning

confidence: 84%

Effective Doping of Single-Walled Carbon Nanotubes with Polyethyleneimine

Rdest

Janas

2020

Materials

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“…Vacuum filtration is a method of covering the required material on the membrane by the negative pressure caused by air extraction. [99] For example, Yang et al prepared asymmetric Janus membrane from FOOH Kevlar solution and ZnO Kevlar solution by vacuum filtration using double layer composite, as shown in Figure 10b. [59] Vacuum filtration could not only simply fabricate Janus membrane, its operation is simple, therefore it has the potential of large-scale preparation of Janus membrane.…”

Section: Double-layer Modificationmentioning

confidence: 99%

“…Vacuum filtration is a method of covering the required material on the membrane by the negative pressure caused by air extraction. [ 99 ] For example, Yang et al. prepared asymmetric Janus membrane from FOOH Kevlar solution and ZnO Kevlar solution by vacuum filtration using double layer composite, as shown in Figure 10b.…”

Section: Design and Fabricationmentioning

confidence: 99%

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Zhang

Sun

Guo

et al. 2021

Advanced Sustainable Systems

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but these separation methods have the disadvantages of low separation efficiency, high energy consumption, complicated operation, and so on. [8] In order to solve these problems, a variety of original oil-water separation methods emerged, which usually separate oil/water mixtures by filtration and absorption. The materials for separating oil/water mixtures by filtration principle include meshes, [9,10] membranes, [11,12] filters, [13,14] film, [15,16] and so on; the materials for separating oil/water mixtures by absorption are porous materials, [17,18] powders/particles, [19,20] gels, [21,22] nanocomposites, [23,24] and so on. [3] The oil/water mixture can be divided into three categories according to the diameter size: free oil: the diameter of droplet is greater than 150 µm; dispersed oil: the diameter of droplet is less than 150 µm and greater than 20 µm; emulsified oil: the diameter of droplet is less than 20 µm. [25][26][27][28][29][30] Among them, emulsions consisting of micro-/nanoscale dispersed droplets within a continuous phase are the most difficult to separate, and the general oil/water separation method cannot effectively separate them. [31][32][33][34][35] Traditional separation methods of oil/water emulsion include thermal/chemical demulsification separation, electrochemical demulsification, centrifugation, etc. [36] However, these separation methods not only have complex operation, low separation efficiency, but also may cause secondary pollution. [4] The separation of oil/water emulsion also adopts the principle of filtration and absorption. [3] When oil/water emulsions are separated by absorption, materials with a 3D structure are often used to separate them, for example, Chen et al. [37] prepared 3D superhydrophobic foams by in situ pretreated by noncovalent surface decoration of plant polyphenol-glutaraldehyde cross-linkage that were pretreated by noncovalent surface decoration of plant polyphenolglutaraldehyde cross-linkage. Although this separation method is effective and does not clog the membrane, it cannot be reused for many times, which increases the cost. When the oil/water emulsion is separated through filtration, demulsification is usually used. Demulsification refers to the reduction of emulsion stability, resulting in immiscible phase separation, including chemical, biological, and physical treatment methods, which are commonly used in membrane separation demulsification methods including size sieving effect, charge-screening effect, With frequent oil spill accidents and the large amount of oily wastewater produced in various industrial and domestic processes, the separation of emulsified oil/water mixtures has become an important topic in environmental protection. Janus membranes with asymmetric wettability stand out among many separation materials for their switchable separation, high separation efficiency, low energy consumption, good repeatability, and durability. In recent years, Janus membranes have developed rapidly, but their separation principles and advantages and disadvan...

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“…Furthermore, the isotropic distribution of these building blocks within the network contributes its share to the extrinsic component of resistance, which must be considered. Recent advances in the field alleviate these problems by substantially improving the internal structure alignment [ 21 , 22 , 23 , 24 ]. Nevertheless, the intrinsic factors of resistance remain a problem.…”

Section: Introductionmentioning

confidence: 99%

Sensing Organophosphorus Compounds with SWCNT Films

Sahlman

Lundström

Janas

2021

Sensors

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Promising electrical properties of single-walled carbon nanotubes (SWCNTs) open a spectrum of applications for this material. As the SWCNT electronic characteristics respond well to the presence of various analytes, this makes them highly sensitive sensors. In this contribution, selected organophosphorus compounds were detected by studying their impact on the electronic properties of the nanocarbon network. The goal was to untangle the n-doping mechanism behind the beneficial effect of organic phosphine derivatives on the electrical conductivity of SWCNT networks. The highest sensitivity was obtained in the case of the application of 1,6-Bis(diphenylphoshpino)hexane. Consequently, free-standing SWCNT films experienced a four-fold improvement to the electrical conductivity from 272 ± 21 to 1010 ± 44 S/cm and an order of magnitude increase in the power factor. This was ascribed to the beneficial action of electron-rich phenyl moieties linked with a long alkyl chain, making the dopant interact well with SWCNTs.

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Groove-Assisted Global Spontaneous Alignment of Carbon Nanotubes in Vacuum Filtration

Cited by 46 publications

References 14 publications

Effective Doping of Single-Walled Carbon Nanotubes with Polyethyleneimine

Effective Doping of Single-Walled Carbon Nanotubes with Polyethyleneimine

Janus Membranes with Asymmetric Wettability Applied in Oil/Water Emulsion Separations

Sensing Organophosphorus Compounds with SWCNT Films

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