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  1. Article ; Online: Energetics of Sulfur-Carbon Interaction.

    Coulet, Marie-Vanessa / Gourmellen, Loïc / Denoyel, Renaud

    Chemphyschem : a European journal of chemical physics and physical chemistry

    2022  Volume 23, Issue 24, Page(s) e202200416

    Abstract: The energetics of sulfur-carbon interaction are studied using thermo-desorption and immersion microcalorimetry experiments. Sulfur is incorporated in meso- and microporous carbons by impregnation either from the liquid phase or the vapor phase. Varying ... ...

    Abstract The energetics of sulfur-carbon interaction are studied using thermo-desorption and immersion microcalorimetry experiments. Sulfur is incorporated in meso- and microporous carbons by impregnation either from the liquid phase or the vapor phase. Varying the temperature of impregnation enables to fill preferentially microporous domains (vapor impregnation) or both micro-meso-macro domains (liquid impregnation). The three carbons lead to similar immersion enthalpies per unit area for liquid sulfur. This suggests that they possess similar surface-liquid interactions and that liquid sulfur, below the polymerization temperature, wets the whole surface accessible to nitrogen.
    MeSH term(s) Carbon/chemistry ; Adsorption ; Sulfur/chemistry ; Nitrogen ; Thermodynamics
    Chemical Substances Carbon (7440-44-0) ; Sulfur (70FD1KFU70) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2022-11-14
    Publishing country Germany
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2025223-7
    ISSN 1439-7641 ; 1439-4235
    ISSN (online) 1439-7641
    ISSN 1439-4235
    DOI 10.1002/cphc.202200416
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  2. Article ; Online: Influence of Surfactant Concentration on Spontaneous Emulsification Kinetics.

    Toor, Ritu / Denoyel, Renaud / Liggieri, Libero / Schmitt, Murielle / Antoni, Mickaël

    Langmuir : the ACS journal of surfaces and colloids

    2022  Volume 38, Issue 38, Page(s) 11521–11528

    Abstract: The kinetics of spontaneous emulsification is investigated on aqueous pendant drops in paraffin oil. Optical microscopy in transmission mode is used for high-spatial-resolution image recording. The influence of a lipophilic surfactant (Span 80) and two ... ...

    Abstract The kinetics of spontaneous emulsification is investigated on aqueous pendant drops in paraffin oil. Optical microscopy in transmission mode is used for high-spatial-resolution image recording. The influence of a lipophilic surfactant (Span 80) and two water-soluble surfactants (CTAB and SDS) is investigated. As time runs, the drop interface turns opaque due to the formation of microstructures associated with spontaneous emulsification. The time evolution of this phenomenon is shown to depend upon temperature and surfactant concentration, which leads to an overall shrinkage due to gradual water uptake and transport into paraffin oil. Spontaneous emulsification kinetics depends upon the chemical composition. Higher concentrations of Span 80 and CTAB (resp. SDS) are shown to promote (resp. hinder) water transport. This work provides new insights into the understanding of spontaneous emulsification when combining the properties of non-ionic and ionic surfactants.
    Language English
    Publishing date 2022-09-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c03443
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  3. Article ; Online: Effect of the polydispersity on the dispersion of polymers through silicas having different morphologies (fully porous and core-shell particles and monoliths).

    Nguyen, Khac-Long / Wernert, Véronique / Denoyel, Renaud

    Journal of chromatography. A

    2021  Volume 1641, Page(s) 461985

    Abstract: The effect of the polydispersity of polystyrenes on the dispersion through silicas having different morphologies (fully porous, core-shell particles and monoliths) was investigated. The heights equivalent to a theoretical plate (HETP) of those columns ... ...

    Abstract The effect of the polydispersity of polystyrenes on the dispersion through silicas having different morphologies (fully porous, core-shell particles and monoliths) was investigated. The heights equivalent to a theoretical plate (HETP) of those columns were measured for a small molecule (toluene) and a series of polystyrenes of different sizes in non-adsorbing conditions. The different contributions to the total HETP including polydispersity were determined experimentally. The longitudinal diffusion and the mass transfer resistance term were obtained from peak parking experiments. The eddy dispersion was obtained from models and experiments. The effect of polydispersity on the HETP values (H
    MeSH term(s) Calibration ; Chromatography, Liquid ; Diffusion ; Molecular Weight ; Particle Size ; Polymers/chemistry ; Polystyrenes/chemistry ; Porosity ; Silicon Dioxide/chemistry
    Chemical Substances Polymers ; Polystyrenes ; Silicon Dioxide (7631-86-9)
    Language English
    Publishing date 2021-02-09
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1171488-8
    ISSN 1873-3778 ; 0021-9673
    ISSN (online) 1873-3778
    ISSN 0021-9673
    DOI 10.1016/j.chroma.2021.461985
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.A 813: Show issues Location:
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  4. Article ; Online: Apparent Anomalous Temperature Dependence of Self-Diffusion Studied by Pulsed-Field Gradient Nuclear Magnetic Resonance and Thermodynamic Modeling.

    Dutta, Sujeet / Nossov, Andrei / Galarneau, Anne / Didi, Youcef / Said, Bilel / Denoyel, Renaud / Wernert, Veronique / Coasne, Benoit / Guenneau, Flavien

    The journal of physical chemistry letters

    2024  Volume 15, Issue 12, Page(s) 3276–3284

    Abstract: The self-diffusivity of cyclohexane ... ...

    Abstract The self-diffusivity of cyclohexane and
    Language English
    Publishing date 2024-03-15
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c03468
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  5. Article: Influence of Surfactant Concentration on Spontaneous Emulsification Kinetics

    Toor, Ritu / Denoyel, Renaud / Liggieri, Libero / Schmitt, Murielle / Antoni, Mickaël

    Langmuir. 2022 Sept. 12, v. 38, no. 38

    2022  

    Abstract: The kinetics of spontaneous emulsification is investigated on aqueous pendant drops in paraffin oil. Optical microscopy in transmission mode is used for high-spatial-resolution image recording. The influence of a lipophilic surfactant (Span 80) and two ... ...

    Abstract The kinetics of spontaneous emulsification is investigated on aqueous pendant drops in paraffin oil. Optical microscopy in transmission mode is used for high-spatial-resolution image recording. The influence of a lipophilic surfactant (Span 80) and two water-soluble surfactants (CTAB and SDS) is investigated. As time runs, the drop interface turns opaque due to the formation of microstructures associated with spontaneous emulsification. The time evolution of this phenomenon is shown to depend upon temperature and surfactant concentration, which leads to an overall shrinkage due to gradual water uptake and transport into paraffin oil. Spontaneous emulsification kinetics depends upon the chemical composition. Higher concentrations of Span 80 and CTAB (resp. SDS) are shown to promote (resp. hinder) water transport. This work provides new insights into the understanding of spontaneous emulsification when combining the properties of non-ionic and ionic surfactants.
    Keywords chemical composition ; emulsifying ; light microscopy ; lipophilicity ; oils ; shrinkage ; surfactants ; temperature ; water solubility ; water uptake
    Language English
    Dates of publication 2022-0912
    Size p. 11521-11528.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.1c03443
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  6. Article: Impact of surface diffusion on transport through porous materials

    Wernert, Véronique / Nguyen, Khac Long / Levitz, Pierre / Coasne, Benoit / Denoyel, Renaud

    Journal of chromatography. 2022 Feb. 22, v. 1665

    2022  

    Abstract: The peak parking method was applied to evaluate the surface diffusivity Dₛ of polystyrenes dissolved in a THF/heptane mixture and transported through porous silica materials with various morphologies. With this method, the overall effective diffusivity D ...

    Abstract The peak parking method was applied to evaluate the surface diffusivity Dₛ of polystyrenes dissolved in a THF/heptane mixture and transported through porous silica materials with various morphologies. With this method, the overall effective diffusivity D is measured experimentally with coarse-grained models like Maxwell equation allowing one to infer the particle diffusivity Dₚz. Such particle diffusivity has two main contributions: in-pore diffusivity Dₚ and surface diffusivity Dₛ. The diffusion within the pores is determined experimentally using either non-adsorbing conditions or calculated from particle porosity, particle tortuosity, and hydrodynamic hindrance. The surface diffusion coefficient Dₛ is usually determined using models considering parallel diffusion in the pores and at the surface but this assumption is rather crude. In this paper, to address this problem, another approach is proposed using the Brownian motion of molecules in the pore space. These two approaches lead to similar equations relating the effective diffusion coefficient D, the in-pore diffusion Dₚ and surface diffusion Dₛ. The surface diffusion is analyzed as a function of the surface affinity of the probes considered here (polystyrenes of different molecular weights/lengths). Such surface affinity depends both on the probe chain length and surface chemistry of the host solid (the latter being characterized here through the silanol surface density). For short chain lengths, a non-monotonic change in the surface diffusion with affinity (i.e. retention factor) is observed in some cases. Yet, generally, as expected, surface diffusion decreases upon increasing the surface affinity. In contrast to short chain lengths, the longest chain lengths are less sensitive to the silanol surface density.
    Keywords chromatography ; diffusivity ; equations ; heptane ; hydrodynamics ; porosity ; silica
    Language English
    Dates of publication 2022-0222
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 218139-3
    ISSN 0021-9673 ; 0378-4355 ; 0376-737X
    ISSN 0021-9673 ; 0378-4355 ; 0376-737X
    DOI 10.1016/j.chroma.2022.462823
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 813: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
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  7. Article ; Online: Impact of surface diffusion on transport through porous materials.

    Wernert, Véronique / Nguyen, Khac Long / Levitz, Pierre / Coasne, Benoit / Denoyel, Renaud

    Journal of chromatography. A

    2022  Volume 1665, Page(s) 462823

    Abstract: The peak parking method was applied to evaluate the surface diffusivity ... ...

    Abstract The peak parking method was applied to evaluate the surface diffusivity D
    Language English
    Publishing date 2022-01-11
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1171488-8
    ISSN 1873-3778 ; 0021-9673
    ISSN (online) 1873-3778
    ISSN 0021-9673
    DOI 10.1016/j.chroma.2022.462823
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 813: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)

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  8. Article ; Online: Microstructure Formation in Freezing Nanosuspension Droplets.

    Nespoulous, Mathieu / Denoyel, Renaud / Antoni, Mickaël

    The journal of physical chemistry letters

    2018  Volume 9, Issue 10, Page(s) 2714–2719

    Abstract: The structural evolution of suspensions upon freezing is studied with optical microscopy in a suspended droplet configuration. Droplets are of millimeter size and consist of an aqueous mixture of silica particles, while the surrounding phase is hexane. ... ...

    Abstract The structural evolution of suspensions upon freezing is studied with optical microscopy in a suspended droplet configuration. Droplets are of millimeter size and consist of an aqueous mixture of silica particles, while the surrounding phase is hexane. Freeze-thaw cycles are applied to this system, and a two-step freezing mechanism is evidenced. A fast adiabatic growth of dendrites that invade the full droplets is first observed and occurs within a few milliseconds. Then, a slow process lasts for several seconds and corresponds to the release of solidification latent heat into the hexane phase. The striking feature of this work is to evidence that after the first freeze-thaw cycle flocculated microstructures are generated. When a second cycle is performed, microstructures further flocculate and generate, for dense silica suspensions, stable porous spheres of the size of the droplets. A phenomenological description based on repulsion or engulfment of particles by solidifying ice fronts is proposed.
    Language English
    Publishing date 2018-05-17
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.8b00984
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  9. Article ; Online: Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces.

    Schmitt, Murielle / Toor, Ritu / Denoyel, Renaud / Antoni, Mickaël

    Langmuir : the ACS journal of surfaces and colloids

    2017  Volume 33, Issue 49, Page(s) 14011–14019

    Abstract: An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial-resolution image ... ...

    Abstract An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial-resolution image recording. The kinetics of spontaneous emulsification is studied. It is shown to generate a darkening of the drops because of interface modification with a characteristic time that depends upon the SPAN80 concentration. For low concentrations, spontaneous emulsification is slow and produces micrometer-sized droplets, whereas for large concentrations, it is fast and bush-like microstructures are observed. These microstructures increase in size and progressively invade the complete water/PO interfaces, detach, and finally migrate into the PO phase. This transport phenomenon withdraws water from the drops and leads to a gradual shrinking of their volume. At the end of this process, they appear as deformed objects surrounded by a loose membrane.
    Language English
    Publishing date 2017--12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.7b02549
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  10. Article: Spontaneous Microstructure Formation at Water/Paraffin Oil Interfaces

    Schmitt, Murielle / Toor Ritu / Denoyel Renaud / Antoni Mickaël

    Langmuir. 2017 Dec. 12, v. 33, no. 49

    2017  

    Abstract: An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial-resolution image ... ...

    Abstract An experimental investigation of spontaneous emulsification is proposed with a water drop pendant in a paraffin oil (PO) solution loaded with a surfactant (SPAN80). Optical microscopy in a transmission mode is employed for high-spatial-resolution image recording. The kinetics of spontaneous emulsification is studied. It is shown to generate a darkening of the drops because of interface modification with a characteristic time that depends upon the SPAN80 concentration. For low concentrations, spontaneous emulsification is slow and produces micrometer-sized droplets, whereas for large concentrations, it is fast and bush-like microstructures are observed. These microstructures increase in size and progressively invade the complete water/PO interfaces, detach, and finally migrate into the PO phase. This transport phenomenon withdraws water from the drops and leads to a gradual shrinking of their volume. At the end of this process, they appear as deformed objects surrounded by a loose membrane.
    Keywords droplets ; emulsifying ; light microscopy ; microstructure ; oils ; surfactants
    Language English
    Dates of publication 2017-1212
    Size p. 14011-14019.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021%2Facs.langmuir.7b02549
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