Phase behavior of the molecular medium in nanopores and vibrational spectra structure transformation

Arakcheev, V.G.; Валеев, А. А.; Morozov, V.B.; Farizanov, I. R.

doi:10.3103/s0027134911020032

Cited by 15 publications

(37 citation statements)

References 16 publications

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“…The experimental setup was described in detail in our previous papers . We used a broad‐band frequency‐domain CARS scheme.…”

Section: Methodsmentioning

confidence: 99%

“…The detailed consideration of modeling was presented previously . CARS spectrum is regarded here as the coherent sum of several contributions attributed to different phases of fluid existing simultaneously in the system.…”

Section: Modelingmentioning

confidence: 99%

“…The presence of admixtures inside nanopores caused a noticeable transformation of the spectrum profile . Thermodynamic approach based on surface adsorption and capillary condensation was applied to estimate the partial amount of the adsorbed fluid and the condensed one inside pores . The theoretical considerations has been successfully approved with the spectral observations obtained for nanoporous glass samples with the pores of radii of 2 and 3.5 nm at temperatures far below the critical value .…”

Section: Introductionmentioning

confidence: 99%

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CARS diagnostics of fluid phase behavior in small mesopores at near‐critical temperatures

Arakcheev

Morozov

2013

J Raman Spectroscopy

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Coherent anti-Stokes Raman scattering (CARS) spectroscopy is applied to investigate the fluid phase behavior in small mesopores at bulk sub-and supercritical temperatures. CARS spectra of the Q-branch (1388 cm À1 ) of carbon dioxide were measured at isothermal compression in pores of two nanoporous glass samples with pore radii of 2 and 3.5 nm. The spectral transformations with pressure of the fluid indicate the formation of a condensed phase in the volume of pores that clearly demonstrates the shift of the critical point. The spectrum of carbon dioxide condensed in the wider pores corresponds approximately to the critical density in bulk. In the narrower pores, the spectrum is noticeably shifted towards the lower wavenumbers that correspond to higher density of condensed fluid.

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“…The experimental setup was described in detail in our previous papers . We used a broad‐band frequency‐domain CARS scheme.…”

Section: Methodsmentioning

confidence: 99%

Section: Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CARS diagnostics of fluid phase behavior in small mesopores at near‐critical temperatures

Arakcheev

Morozov

2013

J Raman Spectroscopy

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“…[10] Our consideration was based on the thermodynamic description of the surface adsorption and capillary condensation. In this section, we briefly review the basic ideas of the approach that is used for modeling of the fluid phase behavior in the nanopores and for the calculations of molecular spectra profiles.…”

Section: Modelingmentioning

confidence: 99%

“…On the basis of these considerations, the detailed analysis of the carbon dioxide phase behavior in pores of nanoporous glass Vycor was recently performed. [10] …”

Section: Capillary Condensationmentioning

confidence: 99%

CARS diagnostics of fluid adsorption and condensation in small mesopores

Andreeva

Arakcheev

Баграташвили

et al. 2011

J Raman Spectroscopy

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Coherent anti-Stokes Raman scattering (CARS) spectroscopy is applied to diagnostics of phase behavior of a fluid in pores of nanoporous glasses. Samples with mean pore radii of 2 and 3.5 nm were filled with compressed carbon dioxide at near-room temperatures. CARS spectra of the 1388 cm −1 Q-branch were measured at isothermal compressing in a wide pressure range including the transition from gaseous to condensed state. The spectra show specific transformations caused by fluid adsorption and condensation in nanopores. We have carried out calculations of the spectral profiles based on the phase behavior of carbon dioxide in cylindrical glass nanopores. Phase behavior modeling was performed using thermodynamic concepts of surface adsorption and capillary condensation. A good agreement between experimental spectra and calculations was obtained. The potential of CARS technique for the diagnostics of fluid phase behavior in pores and for the characterization of nanoporous host structure is discussed.

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Dioxygen Reduction by Cobalt(II) Octaethylporphyrin at Liquid|Liquid Interfaces

Partovi‐Nia

Méndez

et al. 2010

ChemPhysChem

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Oxygen reduction catalyzed by cobalt(II) (2,3,7,8,12,13,17,18‐octaethylporphyrin) [Co(OEP)] at soft interfaces is studied by voltammetry and biphasic reactions. When Co(OEP) is present in a solution of 1,2‐dichloroethane in contact with an aqueous acidic solution, oxygen is reduced if the interface is positively polarized (water phase versus organic phase). This reduction reaction is facilitated when an additional electron donor, here ferrocene, is present in excess in the organic phase.

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Phase behavior of the molecular medium in nanopores and vibrational spectra structure transformation

Cited by 15 publications

References 16 publications

CARS diagnostics of fluid phase behavior in small mesopores at near‐critical temperatures

CARS diagnostics of fluid phase behavior in small mesopores at near‐critical temperatures

CARS diagnostics of fluid adsorption and condensation in small mesopores

Dioxygen Reduction by Cobalt(II) Octaethylporphyrin at Liquid|Liquid Interfaces

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