Unravelling the Role of the Compressed Gas on Melting Point of Liquid Confined in Nanospace

Chen, Shimou; Liu, Yusheng; Fu, Haiying; He, Yaxing; Li, Cheng; Huang, Wei; Jiang, Zheng; Wang, Guozhong

doi:10.1021/jz300225n

Cited by 44 publications

(57 citation statements)

References 26 publications

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“…15 Our previous research proved that RTILs confined within CNTs formed polymorphous crystals at a melting point of >200°C. 16 We also demonstrated that gas compression during RTIL loading in nanospace 17 and the diameter of the basic material 18 considerably affect the structural and dynamic properties of the confined ILs. This unusual thermal transition and crystallization in the nanometric system are strongly influenced by geometric constraints and strong interactions between the solid and fluid, as explained by the Gibbs− Thomson equation.…”

Section: Introductionmentioning

confidence: 81%

Temperature-Induced Molecular Rearrangement of an Ionic Liquid Confined in Nanospaces: An in Situ X-ray Absorption Fine Structure Study

Jiang

et al. 2015

J. Phys. Chem. C

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A temperature-dependent X-ray absorption fine structure (XAFS) study was performed to investigate structural changes in the 1-hexyl-3-methylimidazolium bromine (C 6 mimBr) ionic liquid (IL) confined within the channels of multiwalled carbon nanotubes (MWCNTs). The XAFS spectra at room temperature confirmed the charge transfer from the bromine anion of the encapsulated IL to the MWCNTs. R-space analysis at ambient temperature revealed the reduced distance between the anions and cations in the confined IL compared with that in the bulk state. Interfacialinduced solidification and nanoconfinement in MWCNTs induced the self-assembly of ions in the confined IL to form a layered arrangement near the inner surface of MWCNTs. In situ XAFS analysis revealed that with increasing temperature charge transferred from MWCNTs to Br anions because of the damage from the conjugative effect between Br and MWCNTs and the relatively strong electronegativity of Br atoms. R-space analysis also showed gradual reduction in distance between cations and anions with increasing temperature. This finding indicated that the anion moved toward the ring planar, and ions rearranged from the layered to the near-planar structure. Raman and XRD experiments confirmed the structural transformation of the confined IL at increased temperature.

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Section: Introductionmentioning

confidence: 81%

Temperature-Induced Molecular Rearrangement of an Ionic Liquid Confined in Nanospaces: An in Situ X-ray Absorption Fine Structure Study

Jiang

et al. 2015

J. Phys. Chem. C

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“…The decomposition temperature, which indicates the thermal stability of the ionic liquid, can also be affected by the interface interaction. For example, it was observed that the decomposition temperature of the [BMI][PF 6 ] decreased by 80 °C when the IL was confined in a nonthermal conducting porous silica with pore size less than 10 nm . The reason for this decrease is yet unclear.…”

Section: Ile‐scesmentioning

confidence: 99%

Solid and Solid‐Like Composite Electrolyte for Lithium Ion Batteries: Engineering the Ion Conductivity at Interfaces

Chen

Vereecken

2018

Adv Materials Inter

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The development of solid composite electrolytes or solid composite electrolytes (SCEs) consisting of an ionic conductor and a dielectric matrix offers an elegant strategy to enhance the ionic conductivity of electrolytes by engineering the interface conduction. At the conductor/matrix interface, the ionic conductivity can be enhanced by the enriched charge carrier concentration and/or the changed molecular structure of the ionic conductor. This review deals with the interfacial ion conduction mechanisms of the inorganic particle‐based SCE, polymer‐SCE, and ionic liquid electrolyte‐based SCE (ILE‐SCE). In the first part of this review, an overview is given of the space‐charge theory developed to describe the increased vacancy concentration at the interface of inorganic particle‐based SCE. In the second part, the proposed interface interactions and structural changes associated with interface conduction for the polymer‐SCE and ILE‐SCE are reviewed. For the ILE‐SCE, the preparation methods and interface characterization are discussed together with the proposed conductivity models. The use of mesoporous matrix materials with high internal surface area for ILE‐SCE is reviewed here for the first time.

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“…Nanoconfined ILs constitute therefore a new class of composites, where the confinement effects and the interactions between the ILs and the pore walls of the porous solid networks modify their physicochemical properties compared to the corresponding bulk system. For example, an increase or decrease 24 of the melting point of ILs compared to the bulk state has been experimentally demonstrated under confinement, depending on the nature of the ILs 25 , on the surface chemistry of the solid interface 26,27 , or on the environmental conditions 28 .…”

Section: Introductionmentioning

confidence: 99%

Solid-like Ordering of Imidazolium-Based Ionic Liquids at Rough Nanostructured Oxidized Silicon Surfaces

borghi¹,

Milani²,

Podestà³

2019

Preprint

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The investigation of ionic liquids (ILs) confined in a solid porous matrix is of particular interest considering that these substances are increasingly used as electrolyte in devices employing nanostructured nanoporous materials for the electrodes. Furthermore, the confinement of the ILs into a porous matrix would allow overcoming the difficulties of its packaging, leakage and portability. In order to support applications, a deeper understanding of the interaction of ILs with the nanoporous solid material and its increased interface is required.<br>In this work, we report on the modification of morphological and mechanical properties of the imidazolium-based [Bmim][NTf2] ionic liquid upon surface confinement on a cluster-assembled nanostructured rough oxidized silicon (ns-SiOx) surface. An atomic force microscopy investigation revealed that upon the interaction with the ns-SiOx film, [Bmim][NTf2] locally rearranges into ordered, layered, stiff and poorly conducting solid-like domains, coexisting with, and embedded into, the liquid IL film. The observed interfacial layering of [Bmim][NTf2] deposited on ns-SiOx suggests that the behavior of the IL-electrode interface in photoelectrochemical devices employing nanostructured nanoporous materials can be far more complex than expected under the hypothesis of an IL-based electrolyte in the stable liquid phase. The observed effects reported in this work could in principle take place also inside the bulk nanoporous matrix, where they could be further amplified by the extreme spatial confinement.

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Unravelling the Role of the Compressed Gas on Melting Point of Liquid Confined in Nanospace

Cited by 44 publications

References 26 publications

Temperature-Induced Molecular Rearrangement of an Ionic Liquid Confined in Nanospaces: An in Situ X-ray Absorption Fine Structure Study

Temperature-Induced Molecular Rearrangement of an Ionic Liquid Confined in Nanospaces: An in Situ X-ray Absorption Fine Structure Study

Solid and Solid‐Like Composite Electrolyte for Lithium Ion Batteries: Engineering the Ion Conductivity at Interfaces

Solid-like Ordering of Imidazolium-Based Ionic Liquids at Rough Nanostructured Oxidized Silicon Surfaces

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