Polarized FT-IR Spectra of Water in the Middle Phase of Triton X100-Water System

Kimura, Naoko; Umemura, Junzo; Hayashi, Soichi

doi:10.1006/jcis.1996.0474

Cited by 79 publications

(76 citation statements)

References 15 publications

(19 reference statements)

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“…2 and 3 Sharpening of the peaks is due to complex formation, aggregation and crystallisation of the material in the form of Ag(C 12 EO 10 ) x NO 3 complex. 22 On the basis of the IR data and literature assignments [33][34][35][36] it is clear that upon increasing the silver nitrate concentration, there is a phase transition of the AgNO 3 -C 12 EO 10 : H 2 O (50 w/w%) : HNO 3 system from the hexagonal LC phase, which appears as a clear dense gel, to another phase, which is a white soft solid. It is apparent that the Ag 1 and NO 3 2 ions both play very important roles in the collapsing of H 1 LC phase through altering the hydrophilicity of the EO head group.…”

Section: Resultsmentioning

confidence: 99%

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

et al. 2003

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A lyotropic AgNO 3 , HAuCl 4 and H 2 PtCl 6 -silica liquid crystalline (LC) phase is used as a supramolecular template for a one-pot synthesis of novel noble metal or complex ion containing nanocomposite materials in the form of a film and monolith. In these structures, Ag 1 , AuCl 4 2 and PtCl 6 22 ions interact with the head group of an oligo(ethylene oxide) type non-ionic surfactant (C 12 H 25 (CH 2 CH 2 O) 10 OH, denoted as C 12 EO 10 ) assembly that are embedded within the channels of hexagonal mesostructured silica materials. A chemical and/ or thermal reduction of the metal or complex ions produces nanoparticles of these metals in the mesoporous channels and the void spaces of the silica. The LC mesophase of H 2 O : X : HNO 3 : C 12 EO 10 , (where X is AgNO 3 , HAuCl 4 and H 2 PtCl 6 ), and nanocomposite silica materials of meso-SiO 2 -C 12 EO 10 -X and meso-SiO 2 -C 12 EO 10 -M (M is the Ag, Au and Pt nanoparticles) have been investigated using polarised optical microscopy (POM), powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), Fourier transform (FT) Raman and UV-Vis absorption spectroscopy. Collectively the results indicate that the LC phase of a 50 w/w% H 2 O : C 12 EO 10 is stable upon mixing with AgNO 3 , HAuCl 4 and H 2 PtCl 6 salts and/or acids. The metal ions or complex ions are distributed inside the channels of the mesoporous silica materials at low concentrations and may be converted into metal nanoparticles within the channels by a chemical and/or thermal reduction process. The metal nanoparticles have a broad size distribution where the platinum and silver particles are very small (typically 2-6 nm) and the gold particles are much larger (typically 5-30 nm).

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Section: Resultsmentioning

confidence: 99%

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

et al. 2003

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“…[23][24][25][26] The dielectric behavior of TX-100/water mixtures in a wide frequency range of 1 MHz to 13.5 GHz was recently investigated by Asami. 23 Obvious dielectric relaxation is observed only above 1 GHz for the mixtures, which is assigned to the dynamics of water molecules including bulk-like (free) water and hydration water.…”

Section: B Mechanisms Of the Relaxationsmentioning

confidence: 99%

Dielectric spectroscopy study on ionic liquid microemulsion composed of water, TX-100, and BmimPF6

Chen

Nozaki

2012

The Journal of Chemical Physics

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Articles you may be interested inWe report here a broadband dielectric spectroscopy study on an ionic liquid microemulsion (ILM) composed of water, Triton X-100 (TX-100), and 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF 6 ). It is found that the phase behavior of this ILM can be easily identified by its dielectric response. The dielectric behavior of the ILM in the GHz range is consistent with that of TX-100/water mixtures with comparable water-to-TX-100 weight ratio. It consists of the relaxations due to ethylene oxide (EO) unit relaxation, hydration water dynamics, and/or free water dynamics. The water content dependence of the EO unit relaxation suggests that this relaxation involves dynamics of hydration water molecules. In the IL-in-water microemulsion phase, it is found that bmimPF 6 molecules are preferentially dissolved in water when their concentration in water is lower than the solubility. An additional dielectric relaxation that is absent in the TX-100/water mixtures is observed in the frequency range of 10 7 -10 8 Hz for this ILM. This low-frequency relaxation is found closely related to the bmimPF 6 molecule and could be attributed to the hopping of its cations/anions between the anionic/cationic sites.

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“…3f). The FTIR spectra of similar surfactant molecules in both solid and LC phase have been recorded, and the assignments of the peaks in the δ-CH 2 and ν-CO regions have been made (24,25). However, the δ-CH 2 and ν-CO regions of the spectra become highly broad and hard to convolute when the AgNO 3 /surfactant ratio is between 0.5 and 1.5 (Figs.…”

Section: Resultsmentioning

confidence: 99%

Silver Nitrate/Oligo(ethylene Oxide) Surfactant/Mesoporous Silica Nanocomposite Films and Monoliths

Samarskaya

Dag

2001

Journal of Colloid and Interface Science

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A lyotropic, liquid crystalline (LC) phase of a silver nitrate/ oligo(ethylene oxide), water, and acid mixture was used for onepot synthesis of mesoporous silica materials in which Ag + ions are uniformly distributed. We established that the AgNO 3 -to-surfactant mole ratio is very important in a 50 wt% surfactant/water system to preserve the hexagonal LC phase before and after the addition of the silica source. Below a 0.6 AgNO 3 -to-surfactant mole ratio, the mixture is liquid crystalline and serves as a template for silica polymerization. However, between 0.6 and 0.8 AgNO 3 -to-surfactant mole ratios, one must control the composition of the mixture during the polymerization processes. Above a 0.8 mole ratio, Ag + ions undergo phase separation from the reaction mixture by complexing with the surfactant molecules. The resulting silica materials obtained from AgNO 3 /surfactant ratios above 0.8 have anisotropy but without a hexagonal mesophase. Here, we establish a AgNO 3 concentration range in which the LC phase is preserved to template the synthesis of mesoporous silica, and we discuss the structural behavior of the mixtures at AgNO 3 /surfactant mole ratios of 0.00-2.00, using POM, PXRD, FTIR, and UV-Vis absorption spectroscopy. C 2001 Academic Press

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Polarized FT-IR Spectra of Water in the Middle Phase of Triton X100-Water System

Cited by 79 publications

References 15 publications

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

The synthesis of mesostructured silica films and monoliths functionalised by noble metal nanoparticles

Dielectric spectroscopy study on ionic liquid microemulsion composed of water, TX-100, and BmimPF6

Silver Nitrate/Oligo(ethylene Oxide) Surfactant/Mesoporous Silica Nanocomposite Films and Monoliths

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