Ferroelectric 2D ice under graphene confinement

Chin, Hao-Ting; Klimeš, Jiří; Hu, I-Fan; Chen, Ding-Rui; Nguyen, Hai‐Thai; Chen, Ting-Wei; Ma, Shao-Wei; Hofmann, Mario; Liang, Chi‐Te; Hsieh, Ya‐Ping

doi:10.1038/s41467-021-26589-x

Cited by 20 publications

(16 citation statements)

References 32 publications

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“…To gain further insight into the effect of acid groups on the confined water layer, we used dielectric spectra to explore the degree of water molecules confined in COF membranes. Different from dielectric response of bulk water in GHz to THz range, water molecules in confined space showed a response in lower frequency range owing to the constrain interaction 33 – 35 . Taking the dielectric loss spectra of COF membranes collected at 25 °C and 90% relative humidity (RH) as an example, the TpPa–PO 3 H 2 and TpPa–CO 2 H membranes showed a single dielectric response below 10 Hz, however, the TpPa–SO 3 H membrane exhibited an addition dielectric response in higher frequency region (Fig.…”

Section: Resultsmentioning

confidence: 85%

Covalent organic framework membranes for efficient separation of monovalent cations

et al. 2022

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Covalent organic frameworks (COF), with rigid, highly ordered and tunable structures, can actively manipulate the synergy of entropic selectivity and enthalpic selectivity, holding great potential as next-generation membrane materials for ion separations. Here, we demonstrated the efficient separation of monovalent cations by COF membrane. The channels of COF membrane are decorated with three different kinds of acid groups. A concept of confined cascade separation was proposed to elucidate the separation process. The channels of COF membrane comprised two kinds of domains, acid-domains and acid-free-domains. The acid-domains serve as confined stages, rendering high selectivity, while the acid-free-domains preserve the pristine channel size, rendering high permeation flux. A set of descriptors of stage properties were designed to elucidate their effect on selective ion transport behavior. The resulting COF membrane acquired high ion separation performances, with an actual selectivity of 4.2–4.7 for K+/Li+ binary mixtures and an ideal selectivity of ~13.7 for K+/Li+.

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Section: Resultsmentioning

confidence: 85%

Covalent organic framework membranes for efficient separation of monovalent cations

et al. 2022

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Section: D Ferroelectricsmentioning

confidence: 99%

Ferroic Phases in Two-Dimensional Materials

Man,

Huang,

Zhao

et al. 2023

Chem. Rev.

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Two-dimensional (2D) ferroics, namely ferroelectric, ferromagnetic, and ferroelastic materials, are attracting rising interest due to their fascinating physical properties and promising functional applications. A variety of 2D ferroic phases, as well as 2D multiferroics and the novel 2D ferrovalleytronics/ferrotoroidics, have been recently predicted by theory, even down to the single atomic layers. Meanwhile, some of them have already been experimentally verified. In addition to the intrinsic 2D ferroics, appropriate stacking, doping, and defects can also artificially regulate the ferroic phases of 2D materials. Correspondingly, ferroic ordering in 2D materials exhibits enormous potential for future high density memory devices, energy conversion devices, and sensing devices, among other applications. In this paper, the recent research progresses on 2D ferroic phases are comprehensively reviewed, with emphasis on chemistry and structural origin of the ferroic properties. In addition, the promising applications of the 2D ferroics for information storage, optoelectronics, and sensing are also briefly discussed. Finally, we envisioned a few possible pathways for the future 2D ferroics research and development. This comprehensive overview on the 2D ferroic phases can provide an atlas for this field and facilitate further exploration of the intriguing new materials and physical phenomena, which will generate tremendous impact on future functional materials and devices.

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“…In addition to the bulk phases, confined water widely exists in porous materials and biological channels and has attracted considerable interest, particularly with regard to behaving dramatically differently from their bulk counterparts. − It is believed that the strong confinement can increase the number of possible phases as the new physical dimension of the confinement can disrupt the hydrogen-bonding network of water. Since the first simulation evidence of spontaneous formation of bilayer hexagonal ice for water confined within angstrom-scale slit below the freezing point, numerous low-dimensional ice phases, including one-dimensional (1D) and two-dimensional (2D) ice phases, have been predicted from computer simulations.…”

Section: Introductionmentioning

confidence: 99%

Continuous and First-Order Liquid–Solid Phase Transitions in Two-Dimensional Water

Zhao

Liang

et al. 2022

J. Phys. Chem. B

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Understanding the phase behaviors of nanoconfined water is of importance in fundamental physical science and nanofluidic applications. Herein, we perform sub-microsecond to microsecond long molecular-dynamics (MD) simulations to show evidence of continuous and first-order phase transitions of water confined between two smooth walls with width of h = 1.0 nm. At either relatively low lateral pressure (P L ≤ 10 MPa) or relatively high lateral pressure (P L ≥ 400 MPa), the freezing of the confined water undergoes a first-order phase transition and gives rise to bilayer low-density amorphous (BL-LDA) ice and the trilayer puckered high-density ice (TL-pHDI), respectively. Very interestingly, within a moderate range of lateral pressures (100 MPa ≤ P L ≤ 300 MPa), the confined water appears to undergo a continuous phase transition in the isobaric condition to form a new phase, namely, the bilayer and puckered high-density amorphous (BL-pHDA) ice. A similar continuous phase transition behavior has been reported previously in tens of nanoseconds MD simulations of the freezing of BL water into the BL flat rhombic ice within a narrower hydrophobic nanoslit (h = 0.8 nm) and in the isochoric condition at high densities of water (Nat. Phys.20106685). Our simulation results on the pressure-dependent continuous and first-order phase transitions of the confined water extend the previous study in a different way and thereby provide new insights into the novel thermodynamic phase behavior of low-dimensional water in nanoscale confinement.

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Ferroelectric 2D ice under graphene confinement

Cited by 20 publications

References 32 publications

Covalent organic framework membranes for efficient separation of monovalent cations

Covalent organic framework membranes for efficient separation of monovalent cations

Ferroic Phases in Two-Dimensional Materials

Continuous and First-Order Liquid–Solid Phase Transitions in Two-Dimensional Water

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