Anomalously Soft Dynamics of Water in a Nanotube: A Revelation of Nanoscale Confinement

Kolesnikov, A. I.; Zanotti, Jean-Marc; Loong, C.‐K.; Thiyagarajan, P.; Moravsky, A. P.; Loutfy, Raouf O.; Burnham, Christian J.

doi:10.1103/physrevlett.93.035503

Cited by 513 publications

(541 citation statements)

References 27 publications

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“…Hence, the water wire is liquid-like, consistent with the experimental result of "nanotube water". 56 The radial density profiles of polygonal H 2 hydrates confirm that H 2 molecules are trapped in the interior nanochannel of corresponding polygonal ice nanotubes. As the diameter of SW-CNT increases, the trapped H 2 molecules tend to be located off the center (see Figure 6).…”

Section: Resultsmentioning

confidence: 75%

Spontaneous Formation of One-Dimensional Hydrogen Gas Hydrate in Carbon Nanotubes

et al. 2014

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We present molecular dynamics simulation evidence of spontaneous formation of quasi-one-dimensional (Q1D) hydrogen gas hydrates within single-walled carbon nanotubes (SW-CNTs) of nanometer-sized diameter (1−1.3 nm) near ambient temperature. Contrary to conventional 3D gas hydrates in which the guest molecules are typically contained in individual and isolated cages in the host lattice, the guest H 2 molecules in the Q1D gas hydrates are contained within a 1D nanochannel in which the H 2 molecules form a molecule wire. In particular, we show that in the (15,0) zigzag SW-CNT, the hexagonal H 2 hydrate tends to form, with one H 2 molecule per hexagonal prism, while in the (16,0) zigzag SW-CNT, the heptagonal H 2 hydrate tends to form, with one H 2 molecule per heptagonal prism. In contrast, in the (17,0) zigzag SW-CNT, the octagonal H 2 hydrate can form, with either one H 2 or two H 2 molecules per pentagonal prism (single or double occupancy). Interestingly, in the hexagonal or heptagonal ice nanotube, the H 2 wire is solid-like as the axial diffusion constant is very low (<5 × 10 −10 cm 2 /s), whereas in the octagonal ice nanotube, the H 2 wire is liquid-like as its axial diffusion constant is comparable to 10 −5 cm 2 /s.

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Section: Resultsmentioning

confidence: 75%

Spontaneous Formation of One-Dimensional Hydrogen Gas Hydrate in Carbon Nanotubes

et al. 2014

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“…We noted recent studies on carbon nanotubes showing that water can spontaneously fill small hydrophobic nanopores 36,37 , especially those with small pore diameters [36][37][38][39][40][41][42] , leading to enhanced mass flow or resonance 40,43 . The observed ion conductance of the hydrophobic channel formed by 1a implies that this sub-nm pore may also be filled with water molecules.…”

Section: Direct Measurement Of Transmembrane Water Transportmentioning

confidence: 88%

Self-assembling subnanometer pores with unusual mass-transport properties

et al. 2012

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A long-standing aim in molecular self-assembly is the development of synthetic nanopores capable of mimicking the mass-transport characteristics of biological channels and pores. Here we report a strategy for enforcing the nanotubular assembly of rigid macrocycles in both the solid state and solution based on the interplay of multiple hydrogen-bonding and aromatic π − π stacking interactions. The resultant nanotubes have modifiable surfaces and inner pores of a uniform diameter defined by the constituent macrocycles. The self-assembling hydrophobic nanopores can mediate not only highly selective transmembrane ion transport, unprecedented for a synthetic nanopore, but also highly efficient transmembrane water permeability. These results establish a solid foundation for developing synthetically accessible, robust nanostructured systems with broad applications such as reconstituted mimicry of defined functions solely achieved by biological nanostructures, molecular sensing, and the fabrication of porous materials required for water purification and molecular separations.

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“…DL has been successfully used to investigate the role of water in collagen [10,11] where water appears to be structured in regular chains along the collagen fibrils [12], which would indeed facilitate the proton jump-conduction that could be used by molecules, cells, and tissues to intercommunicate. Such collagen water chains are reminiscent of those seen in carbon nanotubes [13], which are thought to represent an entirely new phase of water.…”

mentioning

confidence: 95%

Delayed luminescence: a novel technique to obtain new insights into water structure

et al. 2012

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Fully understanding the structure of water is a crucial point in biophysics because this liquid is essential in the operation of the engines of life. Many of its amazing anomalies seem to be tailored to support biological processes and, during about a century, several models have been developed to describe the water structuring. In particular, a theory assumes that water is a mixture of domains constituted by two distinct and interconverting structural species, the low-density water (LDW) and the high-density water (HDW). According to this theory, by using some particular solutes or changing the water temperature, it should be possible to modify the equilibrium between the two species, changing in this way the water behavior in specific biological processes, as in governing the shape and stability of the structures of proteins. In this work, we assess the possibility of obtaining information on the structures induced in water by specific salts or by temperature by measuring the delayed luminescence (DL) of some salt solutions and of water in the super-cooled regime. Previous works have demonstrated that the delayed luminescence of a system is correlated with its dynamic ordered structures. The results show significant DL signals only when the formation of LDW domains is expected. The measurement reveals a similar activation energy for the domains both in aqueous salt solutions and super-cooled water. It is worth noting that the time trend of DL signals suggests the existence of structures unusually long-lasting in time, up to the microsecond range.

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Anomalously Soft Dynamics of Water in a Nanotube: A Revelation of Nanoscale Confinement

Cited by 513 publications

References 27 publications

Spontaneous Formation of One-Dimensional Hydrogen Gas Hydrate in Carbon Nanotubes

Spontaneous Formation of One-Dimensional Hydrogen Gas Hydrate in Carbon Nanotubes

Self-assembling subnanometer pores with unusual mass-transport properties

Delayed luminescence: a novel technique to obtain new insights into water structure

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