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  1. Book ; Online: 911-2011. Penser les mondes normands médiévaux

    Bates, David / Bauduin, Pierre

    (Symposia)

    2016  

    Series title Symposia
    Keywords European history ; Early history: c 500 to c 1450/1500 ; Normands ; Europe ; Normandie ; Normandie (ducs de) ; Grande-Bretagne
    Language fra
    Size 1 electronic resource (574 pages)
    Publisher Presses universitaires de Caen
    Publishing place Caen
    Document type Book ; Online
    Note French
    HBZ-ID HT030647213
    ISBN 9782841337743 ; 284133774X
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: Aqueous solubilization of hydrophobic compounds by inorganic nano-ions: An unconventional mechanism

    Chazapi, Ioanna / Diat, Olivier / Bauduin, Pierre

    Elsevier Inc. Journal of Colloid And Interface Science. 2023 May, v. 638 p.561-568

    2023  

    Abstract: Solubilization of hydrophobic compounds in water is commonly performed by using organic solubilizers such as hydrotropes, surfactants, co-solvents, and macrocycles to form host–guest complexes. 3,3′-commo-bis[closo-1,2-dicarba-3-cobaltadodecaborane] ... ...

    Abstract Solubilization of hydrophobic compounds in water is commonly performed by using organic solubilizers such as hydrotropes, surfactants, co-solvents, and macrocycles to form host–guest complexes. 3,3′-commo-bis[closo-1,2-dicarba-3-cobaltadodecaborane] derivatives (COSANs) are fully inorganic and non-amphiphilic ionic boron clusters with nanometric size (nano-ions) showing superchaotropic properties as they strongly bind to neutral organic molecules. Therefore, we expect COSANs to act as solubilizers of sparingly water-soluble molecules, but with a mechanism different from all other organic solubilizers known so far. The aqueous solubilization efficiency of COSANs towards butanol was evaluated by determining phase diagrams and comparing them to classical solubilizers. Nanostructuration of the mixture was studied using UV spectroscopy, small-angle X-ray, and neutron scattering with contrast variation. COSANs act as efficient aqueous solubilizers of medium-chain alcohols (0.6 < log P < 1.5). Unlike surfactants, COSAN is an efficient solubilizer in its monomeric state, at concentrations well below its critical aggregation concentration. Solubilization by COSAN takes place with a bi-dimensional anisotropic growth of COSAN/butanol co-assemblies, whereas solubilization by surfactant occurs via an isotropic swelling of micelles. Appealingly, COSANs/2-butanol co-assemblies efficiently solubilize more hydrophobic compounds with log P values up to around 6, offering new opportunities in many applied fields.
    Keywords anisotropy ; boron ; butanol ; hydrophobicity ; isotropy ; micelles ; neutrons ; small-angle X-ray scattering ; solubilization ; surfactants ; ultraviolet-visible spectroscopy ; water solubility ; COSAN ; Aqueous solubilization ; Hydrophobic compound ; Nano-ion ; Co-assembly ; Perfume ; Dye ; Drug ; CMC ; MHC ; SDS ; 2-BuOH ; UV–vis ; TOC ; CD ; CAC ; SWAXS ; SANS
    Language English
    Dates of publication 2023-05
    Size p. 561-568.
    Publishing place Elsevier Inc.
    Document type Article ; Online
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2023.01.115
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 71/707: Show issues

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  3. Article ; Online: Aqueous solubilization of hydrophobic compounds by inorganic nano-ions: An unconventional mechanism.

    Chazapi, Ioanna / Diat, Olivier / Bauduin, Pierre

    Journal of colloid and interface science

    2023  Volume 638, Page(s) 561–568

    Abstract: Hypothesis: Solubilization of hydrophobic compounds in water is commonly performed by using organic solubilizers such as hydrotropes, surfactants, co-solvents, and macrocycles to form host-guest complexes. 3,3'-commo-bis[closo-1,2-dicarba-3- ... ...

    Abstract Hypothesis: Solubilization of hydrophobic compounds in water is commonly performed by using organic solubilizers such as hydrotropes, surfactants, co-solvents, and macrocycles to form host-guest complexes. 3,3'-commo-bis[closo-1,2-dicarba-3-cobaltadodecaborane] derivatives (COSANs) are fully inorganic and non-amphiphilic ionic boron clusters with nanometric size (nano-ions) showing superchaotropic properties as they strongly bind to neutral organic molecules. Therefore, we expect COSANs to act as solubilizers of sparingly water-soluble molecules, but with a mechanism different from all other organic solubilizers known so far.
    Experiments: The aqueous solubilization efficiency of COSANs towards butanol was evaluated by determining phase diagrams and comparing them to classical solubilizers. Nanostructuration of the mixture was studied using UV spectroscopy, small-angle X-ray, and neutron scattering with contrast variation.
    Findings: COSANs act as efficient aqueous solubilizers of medium-chain alcohols (0.6 < log P < 1.5). Unlike surfactants, COSAN is an efficient solubilizer in its monomeric state, at concentrations well below its critical aggregation concentration. Solubilization by COSAN takes place with a bi-dimensional anisotropic growth of COSAN/butanol co-assemblies, whereas solubilization by surfactant occurs via an isotropic swelling of micelles. Appealingly, COSANs/2-butanol co-assemblies efficiently solubilize more hydrophobic compounds with log P values up to around 6, offering new opportunities in many applied fields.
    Language English
    Publishing date 2023-01-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2023.01.115
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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    In stock of ZB MED Bonn / Germany

    Z 71/707: Show issues

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  4. Article ; Online: Correction to "When Ions Defy Electrostatics: The Case of Superchaotropic Nanoion Adsorption".

    Hohenschutz, Max / Dufrêche, Jean-François / Diat, Olivier / Bauduin, Pierre

    The journal of physical chemistry letters

    2023  Volume 14, Issue 23, Page(s) 5235

    Language English
    Publishing date 2023-06-01
    Publishing country United States
    Document type Published Erratum
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c01501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: When Ions Defy Electrostatics: The Case of Superchaotropic Nanoion Adsorption.

    Hohenschutz, Max / Dufrêche, Jean-François / Diat, Olivier / Bauduin, Pierre

    The journal of physical chemistry letters

    2023  Volume 14, Issue 15, Page(s) 3602–3608

    Abstract: Nanometer-sized anions, like polyoxometalates and borate clusters, bind to nonionic hydrated matter driven by the chaotropic effect, which arises from the favorable dehydration of the ions. Herein, we evaluate the adsorption and activity coefficient of ... ...

    Abstract Nanometer-sized anions, like polyoxometalates and borate clusters, bind to nonionic hydrated matter driven by the chaotropic effect, which arises from the favorable dehydration of the ions. Herein, we evaluate the adsorption and activity coefficient of the superchaotropic Keggin polyoxometalate SiW
    Language English
    Publishing date 2023-04-06
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.3c00095
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Conference proceedings: Vers l'Orient et vers l'Occident

    Bauduin, Pierre

    regards croisés sur les dynamiques et les transferts culturels des Vikings à la Rous ancienne = Eastwards and westwards = Na Zanad i na Vostok

    (Publications du CRAHAM)

    2014  

    Event/congress Colloque (2009.07.22-24, Saint-PétersbourgNovgorod) ; Colloque (2009.09.22-24, Caen)
    Author's details Pierre Bauduin ... (dir.)
    Series title Publications du CRAHAM
    Language French ; English ; Russian
    Size 500 S., Ill., Kt., 29 cm
    Publisher Presses Univ. de Caen
    Publishing place Caen
    Document type Book ; Conference proceedings
    Note Beitr. teilw. franz., teilw. engl. - Zsfassung der Beitr. franz., engl. und russ. - Teilw. in kyrill. Schr. ; Collected essays
    ISBN 9782841334995 ; 2841334996
    Database Former special subject collection: coastal and deep sea fishing

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  7. Article ; Online: Foam Flotation of Clay Particles Using a Bifunctional Amine Surfactant.

    Micheau, Cyril / Ueda, Yuki / Motokawa, Ryuhei / Bauduin, Pierre / Girard, Luc / Diat, Olivier

    Langmuir : the ACS journal of surfaces and colloids

    2023  Volume 39, Issue 31, Page(s) 10965–10977

    Abstract: Understanding clay flotation mechanisms has become a major concern because of the increasing level of environmental contamination of soil and ground water by heavy metals and radionuclides. Clays are often used as sorbents for extracting metals in ... ...

    Abstract Understanding clay flotation mechanisms has become a major concern because of the increasing level of environmental contamination of soil and ground water by heavy metals and radionuclides. Clays are often used as sorbents for extracting metals in indirect flotation processes but can function simultaneously as defoamers. However, how foam generation and stability depend on the molecular interactions between the clays and surfactant is still controversial. In the present study, an amine polyethoxylated surfactant was used as a bifunctional surfactant that collected clay particles and acted as a foaming agent in the flotation process. The pH conditions strongly affected the surfactant physicochemical properties, allowing the clay extraction efficiency to be tuned. The interfacial recovery factor of the clays almost reached 100% under acidic (pH < 6) and neutral (pH 6-10) conditions, whereas it was negative under alkaline conditions (pH > 10), contrary to expectations. To elucidate the mechanisms involved in the particle flotation process for each of the pH conditions, the bulk and foam phases were analyzed. The effects of electrostatic interactions between the solutes and multiscale structure on the clay extraction behavior were investigated by electrophoretic measurements, dynamic light scattering, small-angle neutron scattering, and image analysis. Based on these results, three flotation processes were found depending on pH range: surfactant foam fractionation at pH > 10; clay particle foam flotation at pH 6-10; and particle froth flotation at pH < 6.
    Language English
    Publishing date 2023-07-28
    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.3c01213
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Repulsive, but sticky - Insights into the non-ionic foam stabilization mechanism by superchaotropic nano-ions.

    Braun, Larissa / Hohenschutz, Max / Diat, Olivier / von Klitzing, Regine / Bauduin, Pierre

    Journal of colloid and interface science

    2023  Volume 641, Page(s) 437–448

    Abstract: Hypothesis: The superchaotropic Keggin polyoxometalate α-SiW: Experiments: Imaging and conductimetry were used on macroscopic foams to monitor the foam collapse under free drainage and small angle neutron scattering (SANS) at a given foam height ... ...

    Abstract Hypothesis: The superchaotropic Keggin polyoxometalate α-SiW
    Experiments: Imaging and conductimetry were used on macroscopic foams to monitor the foam collapse under free drainage and small angle neutron scattering (SANS) at a given foam height allowed for the tracking of the evolution of film thickness under quasi-stationary conditions. Thin film pressure balance (TFPB) measurements enabled to quantify the resistance of single foam films to external pressure and to identify intra-film forces.
    Findings: At low SiW/surfactant ratios, the adsorption of SiW induces electrostatic repulsion within foam films. Above a concentration threshold corresponding to an adsorption saturation, excess of SiW screens the electrostatic repulsion that leads to thinner foam films. Despite screened electrostatics, the foam and single foam films remain very stable caused by an additional steric stabilizing force consistent with the presence of trapped micelles inside the foam films that bridge between the interfaces. These trapped micelles can serve as a surfactant reservoir, which promotes self-healing of the interface leading to much more resilient foam films in comparison to bare surfactant foams/films.
    Language English
    Publishing date 2023-03-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2023.03.030
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

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    In stock of ZB MED Bonn / Germany

    Z 71/707: Show issues

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  9. Article ; Online: Toward Distinguishing between the Superchaotropic and Hydrophobic Characters of Nanometric-Sized Ions in Interaction with PEGylated Surfaces.

    Bruckschlegel, Christoph / Pasquier, Coralie / Toquer, Guillaume / Girard, Luc / Odorico, Michael / Lautru, Joseph / Diat, Olivier / Bauduin, Pierre

    The journal of physical chemistry letters

    2024  Volume 15, Issue 15, Page(s) 4229–4236

    Abstract: In this study, we explore the superchaotropic effect of various polyoxometalate or boron cluster nano-ions on hydrophilic neutral surfaces. Nano-ions, characterized by low charge densities, exhibit strong adsorption on non-ionic hydrophilic surfaces like ...

    Abstract In this study, we explore the superchaotropic effect of various polyoxometalate or boron cluster nano-ions on hydrophilic neutral surfaces. Nano-ions, characterized by low charge densities, exhibit strong adsorption on non-ionic hydrophilic surfaces like PEGylated micelles. This adsorption phenomenon was attributed to the enthalpically favorable dehydration of nano-ions, the so-called superchaotropic effect. Here, we investigate the adsorption of three nano-ions, α-SiW
    Language English
    Publishing date 2024-04-11
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.4c00710
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: {2-Phases 2-reactions 1-catalyst} concept for the sustainable performance of coupled reactions

    Schmid, Philipp / Jost, Gasper / Graß, Xaver / Touraud, Didier / Diat, Olivier / Pfitzner, Arno / Bauduin, Pierre

    Green chemistry. 2022 Mar. 21, v. 24, no. 6

    2022  

    Abstract: In recent years, photoredox chemistry has been intensively investigated due to its sustainability and low energy-cost. Here, we propose a physicochemical concept – called {2-phases 2-reactions 1-catalyst} – to perform two chemical reactions ... ...

    Abstract In recent years, photoredox chemistry has been intensively investigated due to its sustainability and low energy-cost. Here, we propose a physicochemical concept – called {2-phases 2-reactions 1-catalyst} – to perform two chemical reactions simultaneously with only one catalyst using a liquid–liquid biphasic system. The well-known and commercially available α-Keggin polyoxometalate (POM), PW₁₂O₄₀³⁻, was used as a photocatalyst for oxidizing a hydrophobic compound in an organic phase. The reduced POM, PW₁₂O₄₀⁴⁻, being more hydrophilic, diffuses then in the aqueous phase where it reduces a hydrophilic compound. After this step, the re-oxidized POM migrates back to the organic phase closing the catalytic cycle. We applied this concept to several basic reactions: oxidations of organic compounds (e.g. alcohol to aldehyde), degradation of organic dyes, metal recovery by reduction of metal ions, and in situ metal–organic complexation reactions. This concept is proposed as a powerful, simple and sustainable tool to couple diverse photo-oxidation/reduction reactions. As an example, oxidative dye degradation/metal (silver) recovery were performed using this general methodology. The main advantage of the {2-phases 2-reactions 1-catalyst} concept is the economy of one reactor and one catalyst, including its self-regeneration by another useful reaction.
    Keywords alcohols ; aldehydes ; dyes ; green chemistry ; hydrophilicity ; hydrophobicity ; photocatalysts ; silver
    Language English
    Dates of publication 2022-0321
    Size p. 2516-2526.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2006274-6
    ISSN 1463-9270 ; 1463-9262
    ISSN (online) 1463-9270
    ISSN 1463-9262
    DOI 10.1039/d1gc04265c
    Database NAL-Catalogue (AGRICOLA)

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