Interfacial structure of an H-bonding liquid confined into silica nanopore with surface silanols

Guégan, Régis; Morineau, Denis; Alba‐Simionesco, Christiane

doi:10.1016/j.chemphys.2005.04.034

Cited by 62 publications

(72 citation statements)

References 28 publications

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“…(Figure 6(a) 4 ]. This speculation is consistent with the conclusions of previous studies [20][21][22][23], in which it was proposed that the chemical bond between the IL and the solid surface limited the degrees of freedom of the dialkyl imidazolium cation and changed the structure of immobilized ILs, resulting also in an obvious variation of XRD patterns.…”

Section: Structural Characterization By Xafs and Xrdsupporting

confidence: 81%

Property variation of ionic liquid [Bmim][AuCl4] immobilized on carboxylated polystyrene submicrospheres with a small surface area

et al. 2013

Chin. Sci. Bull.

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In order to understand the effect of surface chemical groups on the immobilized species, Au-containing imidazolium-based ionic liquid (IL) [Bmim] [AuCl 4 ] was intentionally immobilized on polystyrene (PS) submicrospheres (d ~300 nm) with a very small surface area (4-10 m 2 /g), which possess carboxyl-moiety (COONa or COOH) on the surface. The behavior of immobilized [Bmim][AuCl 4 ] on the two types of submicrospheres was investigated by transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and powder X-ray diffraction (XRD). It was revealed that the melting points (T m ) of [Bmim] [AuCl 4 ] that had been immobilized on PS-COONa and PS-COOH submicrospheres were decreased by 2.7 and 4.1°C, respectively. The interaction mechanism between the IL and submicrosphere surface moieties was further analyzed by X-ray absorption fine structure (XAFS) analysis. The data indicated that the coordination environment of Au species changed markedly when [Bmim] [AuCl 4 ] was immobilized on the surfaces of PS-COONa and PS-COOH submicrospheres, as illustrated by the decrease in white line peak intensity. The effect of surface COOH groups on T m depression and the white line peak intensity of the XANES spectrum is more pronounced than that of COONa groups, most likely due to the possible hydrogen bond formation between the COOH group and

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Section: Structural Characterization By Xafs and Xrdsupporting

confidence: 81%

Property variation of ionic liquid [Bmim][AuCl4] immobilized on carboxylated polystyrene submicrospheres with a small surface area

et al. 2013

Chin. Sci. Bull.

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“…Molecular dynamic simulations suggest the presence of ordered Ic in nanopores (Guegan et al, 2005;Moore et al, 2010) and on various surfaces (Feibelman, 2010), thus the presence of Ic in opal is certainly plausible.…”

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confidence: 99%

Ordering of water in opals with different microstructures

Eckert¹,

Gourdon²,

Jacob³

et al. 2015

ejm

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Opal has long fascinated scientists. It is one of the few minerals with an amorphous structure, and yet, compared to silica glass, it is highly organized on the mesoscale. By means of inelastic neutron scattering (INS), we could document that in four samples of opal at low temperature an ice-like structure of water is present, with details depending on microstructural characteristics. While FTIR spectra for all samples are nearly identical and thus not very informative, INS shows clear differences, highlighting the significance of microstructures. Neutron diffraction at 100 K on one of the opal samples provides evidence for crystalline cubic ice.

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“…One of the simplest anisotropic molecules is methanol. As of yet, its liquid state in confined geometries has been studied only inside cylindrical nanotubes [9][10][11][12][13][14][15][16][17] .…”

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confidence: 99%

Strings-to-Rings Transition and Antiparallel Dipole Alignment in Two-Dimensional Methanols

Zangi

Roccatano

2016

Nano Lett.

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Structural order emerging in the liquid state necessitates a critical degree of anisotropy of the molecules. For example, liquid crystals and Langmuir monolayers require rodor disc-shaped and long-chain amphiphilic molecules, respectively, to break the isotropic symmetry of liquids. In this Letter we present results from molecular dynamics simulations demonstrating that in two-dimensional liquids, a significantly smaller degree of anisotropy is sufficient to allow structural organization. In fact, the condensed phase of the smallest amphiphilic molecule, methanol, confined between two, or adsorbed on, graphene sheets forms a monolayer characterized by long chains of molecules. Intrachain interactions are dominated by hydrogen bonds, whereas interchain interactions are dispersive. Upon a decrease in density toward a gaslike state, these strings are transformed into rings. The two-dimensional liquid phase of methanol undergoes another transition upon cooling; in this case, the order−disorder transition is characterized by a low-temperature phase in which the hydrogen bond dipoles of neighboring strings adopt an antiparallel orientation.

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Interfacial structure of an H-bonding liquid confined into silica nanopore with surface silanols

Cited by 62 publications

References 28 publications

Property variation of ionic liquid [Bmim][AuCl4] immobilized on carboxylated polystyrene submicrospheres with a small surface area

Property variation of ionic liquid [Bmim][AuCl4] immobilized on carboxylated polystyrene submicrospheres with a small surface area

Ordering of water in opals with different microstructures

Strings-to-Rings Transition and Antiparallel Dipole Alignment in Two-Dimensional Methanols

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