Dynamic assembly of liquid crystalline graphene oxide gel fibers for ion transport

Park, H.; Lee, K. H.; Kim, Y. B.; Ambade, Swapnil B.; Noh, Sung Hyun; Eom, Wonsik; Hwang, Jun Yeon; Lee, W. J.; Huang, Jiaxing; Han, Tae Hee

doi:10.1126/sciadv.aau2104

Cited by 98 publications

(82 citation statements)

References 49 publications

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“…To fabricate more ordered laminar structure with the minimal number of nonidealities (imperfect stacking, folding, and wrinkles), 2D nanosheets should be kept horizontally aligned when depositing over each other. Besides adjusting intersheet interactions, external forces such as centrifugal, shear, compressive, and even magnetic forces may be employed in this process . 3) Transporting Mechanism : It is obvious that most studies so far endeavor to explain the mass transporting behaviors in horizontal channels including interlayer capillaries and wrinkles.…”

Section: Discussionmentioning

confidence: 99%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

258

148

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energy storage and conversion devices, [26][27][28] as outlined in recent reviews (Figure 1, left). [29] Behind these applications lie a fundamental question: how water and ion transport are controlled in the laminar structure to obtain desired selectivity. A comprehensive summary of structure-transport relation is thereby imperative to understand and optimize membrane selective performance, but is so far lacking. In such context, our review aims to fill this gap by discussing: 1) how 2D materials with specific physicochemical features are assembled into laminar membranes; 2) most importantly, how membrane structure, and its response to external impacts, can tune mass transport (herein, water and ions); 3) how these transport mechanisms translate into selectivity in applications, and into future design of high-performance laminar membranes. Unsolved problems and emerging challenges around these topics are then concluded. We note that the knowledge summarized here can also, at least partly, assist the understanding of the selective gas, liquid, and micromolecule transport through laminar membranes, which are gaining considerable attention as well. [30][31][32] Transition Metal Carbides and/or Nitrides (MXene): MXene nanosheets are etched and delaminated from parent bulk MAX to M n+1 X n T x (e.g., Ti 3 C 2 T x ), and have thus several atom sublayers. [39] While M and X are early transition metal

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Section: Discussionmentioning

confidence: 99%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

258

148

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“…Very recently, a systematic analysis of the electro-optical response of GO LCs under alternating fields was presented by Guerrero et al [378] and a shear-induced stripe assembly was reported by Hong et al [379]. Due to these intriguing physical properties, various potential applications based on GO LCs (Figure 15c-e), such as GO LC gels with "shape memory" effect [380], photoluminescence imaging [381], nanocomposites [382][383][384], sensitive strain sensors [385], transparent electrodes [386], conductive fibres [387][388][389][390], multifunctional yarns [391] and membranes [392], flame-retardant nanocoatings [393], optical devices [394] and biomedical applications [395], have been anticipated and some of them have been realized. More relevant information can be found in a recent review published by Sasikala et al [396].…”

Section: Lc-aided-assembly and Self-assembly Of Nanomaterialsmentioning

confidence: 92%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

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The research field of liquid crystals and their applications is recently changing from being largely focused on display applications and optical shutter elements in various fields, to quite novel and diverse applications in the area of nanotechnology and nanoscience. Functional nanoparticles have recently been used to a significant extent to modify the physical properties of liquid crystals by the addition of ferroelectric and magnetic particles of different shapes, such as arbitrary and spherical, rods, wires and discs. Also, particles influencing optical properties are increasingly popular, such as quantum dots, plasmonic, semiconductors and metamaterials. The self-organization of liquid crystals is exploited to order templates and orient nanoparticles. Similarly, nanoparticles such as rods, nanotubes and graphene oxide are shown to form lyotropic liquid crystal phases in the presence of isotropic host solvents. These effects lead to a wealth of novel applications, many of which will be reviewed in this publication. the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About 25 different thermotropic phases are known to date, and they are still increasing in number. Appl. Sci. 2019, 9, x FOR PEER REVIEW 2 of 47 unique effects of the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About...

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“…This strategy allows the cost‐effective production of 2D‐NLMs with tunable nanochannels at large scale . Given the ease of synthesis, high‐level structural tunability and versatility, 2D‐NLMs have been extensively explored for confined molecular and ion transport by many research groups including Gao, Geim, Gogotsi, Guo, Huang, Jin, Li, Mi, Nair, Ren, Zhu, and more. The following section will lay out some of the typical attributes of 2D‐NLMs obtained by cascading to correlate with the advances in solvation‐involved nanoionics research.…”

Section: Constructing Void Nanostructures For Nanoionics From 2d Nanomentioning

confidence: 99%

“…The solution processability of 2D nanomaterials is particularly attractive for application‐related research. First, large‐area fabrication of 2D‐NLMs can be readily achieved via ordinary liquid processing techniques including filtration, spinning, and casting, facilitating the translation of their unique ionic behaviors into real‐world applications. Second, the thickness of 2D‐NLMs can be made exceptionally thin, down to ≈10 nm.…”

Section: Potential Of 2d‐nlms For Solvation‐involved Nanoionicsmentioning

confidence: 99%

“…This enables novel ionic applications, such as fabrication of ionic diodes and transistors 122a. Lastly, ion transport can be optimized through the liquid processing conditions . The phase of colloids or shearing rate during processing can be controlled to engineer the internal structure and ionic transport properties of the 2D nanomaterials‐containing membranes …”

Section: Potential Of 2d‐nlms For Solvation‐involved Nanoionicsmentioning

confidence: 99%

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Solvation‐Involved Nanoionics: New Opportunities from 2D Nanomaterial Laminar Membranes

et al. 2019

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Nanoporous laminar membranes composed of multilayered 2D nanomaterials (2D‐NLMs) are increasingly being exploited as a unique material platform for understanding solvated ion transport under nanoconfinement and exploring novel nanoionics‐related applications, such as ion sieving, energy storage and harvesting, and in other new ionic devices. Here, the fundamentals of solvation‐involved nanoionics in terms of ionic interactions and their effect on ionic transport behaviors are discussed. This is followed by a summary of key requirements for materials that are being used for solvation‐involved nanoionics research, culminating in a demonstration of unique features of 2D‐NLMs. Selected examples of using 2D‐NLMs to address the key scientific problems related to nanoconfined ion transport and storage are then presented to demonstrate their enormous potential and capabilities for nanoionics research and applications. To conclude, a personal perspective on the challenges and opportunities in this emerging field is presented.

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Dynamic assembly of liquid crystalline graphene oxide gel fibers for ion transport

Abstract: Highly aligned GO gel fibers are fabricated under high extensional flow for efficient nanofluidic transport of ion species.

Cited by 98 publications

References 49 publications

2D Laminar Membranes for Selective Water and Ion Transport

2D Laminar Membranes for Selective Water and Ion Transport

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Solvation‐Involved Nanoionics: New Opportunities from 2D Nanomaterial Laminar Membranes

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