Les produits d'entretien menagers ont principalement pour fonction de nettoyer les surfaces d... more Les produits d'entretien menagers ont principalement pour fonction de nettoyer les surfaces dures. Leur composition est plus ou moins complexe. Ils contiennent toujours des agents de surface , encore appeles tensioactifs ou surfactifs , qui permettent l'elimination des salissures, associes a divers additifs variant selon l'application : des acides utilises comme detartrants et antirouille, des bases qui exhaltent l'activite des savons et dissolvent les graisses par hydrolyse, des agents complexants utilises pour leur action anticalcaire, des adjuvants divers comme les enzymes, les agents de blanchiment, les azurants optiques, les desinfectants et antiseptiques, les conservateurs, les abrasifs, les solvants, les parfums... Cependant, aucun produit ne donne de resultats optimaux sur toutes les surfaces pour tous les types de salissures. En consequence, il existe un nombre important de produits menagers disponibles sur le marche. Ils sont formules de maniere a etre efficaces en termes de performances mais aussi a etre pratiques d'utilisation. Certains sont concus pour un usage plus general, comme les nettoyants dits tout usage ou universels, qui representent environ 29 % du marche, tandis que d'autres donneront de meilleurs resultats sur des surfaces specifiques et/ou pour des salissures precises ; ceux-la representent environ 65 % du marche. Les fabricants ont pris l'habitude de denommer « surfaces dures » les surfaces concernees par les produits d'entretien menager, par opposition a la souplesse de la peau ou des textiles. Ces surfaces sont tres variees et incluent par exemple les sols, les murs, les carreaux de fenetres ou encore les appareils electromenagers. Elles sont constituees de materiaux divers tels que le verre (fenetres), la fibre de verre (cabines de douche), la ceramique (sols, surfaces de cuisson), le metal (appareils menagers, robinets), le marbre (sols), les surfaces peintes (plafonds, murs), l'acrylique (baignoires), le cuir (meubles), le plastique, la porcelaine (eviers), le caoutchouc (revetements de sol), le bois (meubles, planchers), le papier (revetements muraux)... (tableau 1 ). Outre la diversite des surfaces dures, les produits doivent s'attaquer a differents types de salissures selon les surfaces sur lesquelles ils sont utilises, ce qui implique des compositions adaptees a chaque utilisation. Par exemple, dans la cuisine, il sera necessaire de disposer d'un produit efficace contre les graisses, les salissures brulees ou encore les traces de calcaire. De plus, chaque produit aura sa specificite. Un produit pour les toilettes devra presenter un caractere « hygiene » (en contenant de l'eau de javel par exemple) ou « anticalcaire » (il comportera alors des acides) ; un lave-vitres devra nettoyer mais eviter le depot de traces visibles, ce qui implique l'utilisation de composes s'evaporant totalement tels que les ethers de glycol. Cet article traite plus specifiquement des produits pour le nettoyage de la vaisselle a la main et en machine et aborde plus precisement leur formulation et le mode d'action des differents constituants 1 2 3 .
... as a Kinetic Booster for the Chemical Generation of Singlet Oxygen in Methanol Marion Colline... more ... as a Kinetic Booster for the Chemical Generation of Singlet Oxygen in Methanol Marion Collinet-Fressancourta,b, Nathalie Azarouala,c, Jean-Marie Aubrya,b and V ... that DMSO does not react chemically with 1O2 as evidenced by its lifetime in this solvent ( = 19 s).8 Bunton et ...
La detergence est un processus complexe qui associe des phenomenes de mouillabilite, d’adsorption... more La detergence est un processus complexe qui associe des phenomenes de mouillabilite, d’adsorption aux interfaces liquide/solide, d’emulsification, de solubilisation et de dispersion dans le liquide lessiviel. Chaque ingredient de la formule remplit une fonction, qu’elle soit principale (laver le linge), secondaire (l’assouplir) ou tertiaire (le rafraichir). Le cahier des charges, necessaire a l’elaboration d’une formule de detergent, est cense contenir l’ensemble de ces criteres. La formulation universelle n’existe pas, elle est dependante non seulement du pays, mais aussi des attentes et habitudes du consommateur.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Dec 1, 2021
Abstract A series of PEG-functionalized silica nanoparticles with various molecular weight (MW 20... more Abstract A series of PEG-functionalized silica nanoparticles with various molecular weight (MW 200, 400, 550, 2000, 5000 g.mol-1) have been prepared through a one-step synthesis and further used for the elaboration of temperature-responsive Pickering. The physicochemical properties of the nanoparticles were determined by TEM, TGA, DLS, surface tension and zeta potential measurements and the formed emulsions have been characterized by optical microscopy. The ability of SiO2@mPEG 550 to form temperature-responsive emulsions with oils of different nature has been explained by the hydrophilic/hydrophobic balance of the PEG/mPEG chains. The emulsions stabilized with PEG-functionalized SiO2 NPs undergo a clear temperature-triggered destabilization from room temperature to 80 °C due to the modification of the distribution of the PEG/mPEG chain at the oil-water interface.
ABSTRACT One of the most usual methods used to deoxygenate water and prevent the corrosion of ind... more ABSTRACT One of the most usual methods used to deoxygenate water and prevent the corrosion of industrial boilers is based on the reduction of dioxygen in aqueous alkaline solution with an hydroxylamine in the presence of catalytic amounts of hydroquinone (H2Q). In order to improve the effectiveness and the “greenness” of this process, the influence of the nature of the hydroxylamine and of the catalyst has been investigated. With H2Q as a catalyst, the efficiency of various hydroxylamines was found to be in the following order: methylhydroxylamine > dimethylhydroxylamine > hydroxylamine > tert-butylhydroxylamine > diethylhydroxylamine (DEHA). To replace the potentially carcinogenic hydroquinone, a natural polyphenol, i.e. gallic acid, which was previously shown to be safer and more robust that H2Q to trap O2 in the presence of DEHA, was used. Methylhydroxylamine was still by far the most active partner, but DEHA was almost as efficient as the other hydroxylamines, free hydroxylamine being the least active oxygen scavenger. As only a catalytic amount of dioxygen scavenger is required in the presence of appropriate hydroxylamines, compounds having a bit more acute toxicity but higher reactivity than hydroquinone may also be alternative catalytic systems. Hence, five aminophenols, i.e. 4-aminophenol, 4-amino-2,5-dichlorophenol, 5-amino-salicylic acid, 4-N-methylaminophenol and 4-N,N-dimethylaminophenol, were also investigated. Among them, 4-N-methylaminophenol was found to be the most efficient although much slower than H2Q.
Journal of Colloid and Interface Science, May 1, 2008
Azelaic acid was used as a starting material for the preparation of new monoester surfactants bas... more Azelaic acid was used as a starting material for the preparation of new monoester surfactants based on fragrance alcohols. Sodium monocitronellyl azelate (citroC(9)Na) and sodium monomenthyl azelate (menC(9)Na) were synthesized and their aqueous phase behaviour was studied. For comparison, monoesters derived from succinic anhydride, i.e. sodium monocitronellyl succinate (citroC(4)Na) and sodium monomenthyl succinate (menC(4)Na), were also prepared as well as sodium monodecyl succinate (C(10)C(4)Na) and sodium monodecyl azelate (C(10)C(9)Na) in order to study the effect of the position of the ester function inside the hydrophobic tail and of branching and unsaturation respectively. Liquid crystal structures were examined by optical polarising microscopy and schematic partial binary phase diagrams (surfactant+water, 0-100 wt%, 10-90 degrees C) of the surfactants were established. Succinate surfactants behave as longer alkyl chain surfactants than their azelate counterparts, meaning that these last ones probably adopt a more folded conformation, with the ester function more frequently present at the micelle surface. This conformation would result in a rougher micelle surface, making it slightly less easy for micelles to pack in liquid crystalline phases. It was also shown that the tendency to adopt a more folded conformation and to form smaller micelles is ranked in this order: monomenthyl>monocitronellyl>monodecyl.
A predictive tool called COSMO‐RS, Conductor‐Like Screening Model for Real Solvents, based on qua... more A predictive tool called COSMO‐RS, Conductor‐Like Screening Model for Real Solvents, based on quantum chemistry, dielectric continuum models, electrostatics surface interactions, and statistical thermodynamics, has been used to predict five key physicochemical properties of raw materials used in perfumery industries. The prediction of boiling point (BP), octanol‐water partition coefficient (log P), vapor pressure (VP), water solubility (WS), and Henry's law constant (HLC) of fragrance molecules has been validated with a reference data set of 166 organic compounds. Knowing these properties for a fragrance molecule is essential and being able to predict them precisely can be particularly useful in the development of new molecules or in the replacement of controversial molecules regarding safety issues without compromising the overall hedonic accord. Finally, mapping the vapor pressure versus the Henry's law constant and the octanol‐water partition coefficient consistently predicts the note class of the molecules useful for release comparison of captives.
Journal of Molecular Catalysis A-chemical, Feb 1, 2015
ABSTRACT A simple thermo-responsive one-phase microemulsion (μem) is designed to enable the dark ... more ABSTRACT A simple thermo-responsive one-phase microemulsion (μem) is designed to enable the dark singlet oxidation of organic substrates while allowing a straightforward separation of the catalytic surfactant and products in two distinct phases by cooling down the reaction medium. This latter is prepared by combining a small amount (1%) of the catalytic surfactant bis(dimethyldioctylammonium) molybdate, [DiC8]2[MoO4], with the nonionic amphiphile tetraethylene glycol monooctyl ether, C8E4. Tensiometry and dynamic light scattering are used to rationalize the synergy between the two surfactants which strongly interact. The oxidation takes place in the effective one-phase Winsor IV system which separates into two phases (μem + oil, i.e. Winsor I) just by temperature change thanks to the presence of the thermo-sensitive C8E4. The thermal-controlled nanostructured reaction medium is applied to the ene reaction, [4+2] cycloaddition and sulfide oxidation.
International Journal of Pharmaceutics, Oct 1, 2016
Nosocomial infections have emerged as important causes of morbidity and mortality in immunocompro... more Nosocomial infections have emerged as important causes of morbidity and mortality in immunocompromised individuals. In this respect, biocides are widely used in hospitals leading to resistant microorganisms. We show here that cyclodextrins can remarkably boost the virucidal activity of di-n-decyldimethylammonium chloride. These oligosaccharides synergistically work with the biocide affording a noticeable reduction of the active virucide concentration between 40 and 85%. Partial replacement of a significant amount of the biocide by eco- and bio-compatible cyclodextrins whilst maintaining the same activity is of great interest as it allows the reduction of the toxicological drawbacks of classical biocide mixtures.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Nov 1, 2021
Abstract Hansen Solubility Parameters (HSP) have been shown to be an effective approach for ratio... more Abstract Hansen Solubility Parameters (HSP) have been shown to be an effective approach for rationalizing and predicting the stability of titanium dioxide nanoparticles (TiO2 NPs) dispersions. However, interparticle electrostatic interactions, not considered in Hansen’s approach but taken into account in the DLVO theory, are expected to play a significant role in organic solvents having a notable dielectric constant. Zeta potential ζ of TiO2 P25 NPs was measured in both aqueous and organic media to identify DLVO-stabilized dispersions from those stabilized by more specific NP-solvent interaction. Stability was quantified using a Turbiscan optical device which provides Stokes diameters and Relative Turbiscan Stability Index (RTSI). When the zeta potential of NPs and the dielectric constant of the solvent are both high, the dispersion benefits from additional stabilization while when the electrostatic repulsion is negligible, only the solvents within a Hansen dispersion sphere give stable dispersions. The two interpretations are therefore complementary to describe the behavior of TiO2 dispersions in organic solvents.
Les produits d'entretien menagers ont principalement pour fonction de nettoyer les surfaces d... more Les produits d'entretien menagers ont principalement pour fonction de nettoyer les surfaces dures. Leur composition est plus ou moins complexe. Ils contiennent toujours des agents de surface , encore appeles tensioactifs ou surfactifs , qui permettent l'elimination des salissures, associes a divers additifs variant selon l'application : des acides utilises comme detartrants et antirouille, des bases qui exhaltent l'activite des savons et dissolvent les graisses par hydrolyse, des agents complexants utilises pour leur action anticalcaire, des adjuvants divers comme les enzymes, les agents de blanchiment, les azurants optiques, les desinfectants et antiseptiques, les conservateurs, les abrasifs, les solvants, les parfums... Cependant, aucun produit ne donne de resultats optimaux sur toutes les surfaces pour tous les types de salissures. En consequence, il existe un nombre important de produits menagers disponibles sur le marche. Ils sont formules de maniere a etre efficaces en termes de performances mais aussi a etre pratiques d'utilisation. Certains sont concus pour un usage plus general, comme les nettoyants dits tout usage ou universels, qui representent environ 29 % du marche, tandis que d'autres donneront de meilleurs resultats sur des surfaces specifiques et/ou pour des salissures precises ; ceux-la representent environ 65 % du marche. Les fabricants ont pris l'habitude de denommer « surfaces dures » les surfaces concernees par les produits d'entretien menager, par opposition a la souplesse de la peau ou des textiles. Ces surfaces sont tres variees et incluent par exemple les sols, les murs, les carreaux de fenetres ou encore les appareils electromenagers. Elles sont constituees de materiaux divers tels que le verre (fenetres), la fibre de verre (cabines de douche), la ceramique (sols, surfaces de cuisson), le metal (appareils menagers, robinets), le marbre (sols), les surfaces peintes (plafonds, murs), l'acrylique (baignoires), le cuir (meubles), le plastique, la porcelaine (eviers), le caoutchouc (revetements de sol), le bois (meubles, planchers), le papier (revetements muraux)... (tableau 1 ). Outre la diversite des surfaces dures, les produits doivent s'attaquer a differents types de salissures selon les surfaces sur lesquelles ils sont utilises, ce qui implique des compositions adaptees a chaque utilisation. Par exemple, dans la cuisine, il sera necessaire de disposer d'un produit efficace contre les graisses, les salissures brulees ou encore les traces de calcaire. De plus, chaque produit aura sa specificite. Un produit pour les toilettes devra presenter un caractere « hygiene » (en contenant de l'eau de javel par exemple) ou « anticalcaire » (il comportera alors des acides) ; un lave-vitres devra nettoyer mais eviter le depot de traces visibles, ce qui implique l'utilisation de composes s'evaporant totalement tels que les ethers de glycol. Cet article traite plus specifiquement des produits pour le nettoyage de la vaisselle a la main et en machine et aborde plus precisement leur formulation et le mode d'action des differents constituants 1 2 3 .
... as a Kinetic Booster for the Chemical Generation of Singlet Oxygen in Methanol Marion Colline... more ... as a Kinetic Booster for the Chemical Generation of Singlet Oxygen in Methanol Marion Collinet-Fressancourta,b, Nathalie Azarouala,c, Jean-Marie Aubrya,b and V ... that DMSO does not react chemically with 1O2 as evidenced by its lifetime in this solvent ( = 19 s).8 Bunton et ...
La detergence est un processus complexe qui associe des phenomenes de mouillabilite, d’adsorption... more La detergence est un processus complexe qui associe des phenomenes de mouillabilite, d’adsorption aux interfaces liquide/solide, d’emulsification, de solubilisation et de dispersion dans le liquide lessiviel. Chaque ingredient de la formule remplit une fonction, qu’elle soit principale (laver le linge), secondaire (l’assouplir) ou tertiaire (le rafraichir). Le cahier des charges, necessaire a l’elaboration d’une formule de detergent, est cense contenir l’ensemble de ces criteres. La formulation universelle n’existe pas, elle est dependante non seulement du pays, mais aussi des attentes et habitudes du consommateur.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Dec 1, 2021
Abstract A series of PEG-functionalized silica nanoparticles with various molecular weight (MW 20... more Abstract A series of PEG-functionalized silica nanoparticles with various molecular weight (MW 200, 400, 550, 2000, 5000 g.mol-1) have been prepared through a one-step synthesis and further used for the elaboration of temperature-responsive Pickering. The physicochemical properties of the nanoparticles were determined by TEM, TGA, DLS, surface tension and zeta potential measurements and the formed emulsions have been characterized by optical microscopy. The ability of SiO2@mPEG 550 to form temperature-responsive emulsions with oils of different nature has been explained by the hydrophilic/hydrophobic balance of the PEG/mPEG chains. The emulsions stabilized with PEG-functionalized SiO2 NPs undergo a clear temperature-triggered destabilization from room temperature to 80 °C due to the modification of the distribution of the PEG/mPEG chain at the oil-water interface.
ABSTRACT One of the most usual methods used to deoxygenate water and prevent the corrosion of ind... more ABSTRACT One of the most usual methods used to deoxygenate water and prevent the corrosion of industrial boilers is based on the reduction of dioxygen in aqueous alkaline solution with an hydroxylamine in the presence of catalytic amounts of hydroquinone (H2Q). In order to improve the effectiveness and the “greenness” of this process, the influence of the nature of the hydroxylamine and of the catalyst has been investigated. With H2Q as a catalyst, the efficiency of various hydroxylamines was found to be in the following order: methylhydroxylamine > dimethylhydroxylamine > hydroxylamine > tert-butylhydroxylamine > diethylhydroxylamine (DEHA). To replace the potentially carcinogenic hydroquinone, a natural polyphenol, i.e. gallic acid, which was previously shown to be safer and more robust that H2Q to trap O2 in the presence of DEHA, was used. Methylhydroxylamine was still by far the most active partner, but DEHA was almost as efficient as the other hydroxylamines, free hydroxylamine being the least active oxygen scavenger. As only a catalytic amount of dioxygen scavenger is required in the presence of appropriate hydroxylamines, compounds having a bit more acute toxicity but higher reactivity than hydroquinone may also be alternative catalytic systems. Hence, five aminophenols, i.e. 4-aminophenol, 4-amino-2,5-dichlorophenol, 5-amino-salicylic acid, 4-N-methylaminophenol and 4-N,N-dimethylaminophenol, were also investigated. Among them, 4-N-methylaminophenol was found to be the most efficient although much slower than H2Q.
Journal of Colloid and Interface Science, May 1, 2008
Azelaic acid was used as a starting material for the preparation of new monoester surfactants bas... more Azelaic acid was used as a starting material for the preparation of new monoester surfactants based on fragrance alcohols. Sodium monocitronellyl azelate (citroC(9)Na) and sodium monomenthyl azelate (menC(9)Na) were synthesized and their aqueous phase behaviour was studied. For comparison, monoesters derived from succinic anhydride, i.e. sodium monocitronellyl succinate (citroC(4)Na) and sodium monomenthyl succinate (menC(4)Na), were also prepared as well as sodium monodecyl succinate (C(10)C(4)Na) and sodium monodecyl azelate (C(10)C(9)Na) in order to study the effect of the position of the ester function inside the hydrophobic tail and of branching and unsaturation respectively. Liquid crystal structures were examined by optical polarising microscopy and schematic partial binary phase diagrams (surfactant+water, 0-100 wt%, 10-90 degrees C) of the surfactants were established. Succinate surfactants behave as longer alkyl chain surfactants than their azelate counterparts, meaning that these last ones probably adopt a more folded conformation, with the ester function more frequently present at the micelle surface. This conformation would result in a rougher micelle surface, making it slightly less easy for micelles to pack in liquid crystalline phases. It was also shown that the tendency to adopt a more folded conformation and to form smaller micelles is ranked in this order: monomenthyl>monocitronellyl>monodecyl.
A predictive tool called COSMO‐RS, Conductor‐Like Screening Model for Real Solvents, based on qua... more A predictive tool called COSMO‐RS, Conductor‐Like Screening Model for Real Solvents, based on quantum chemistry, dielectric continuum models, electrostatics surface interactions, and statistical thermodynamics, has been used to predict five key physicochemical properties of raw materials used in perfumery industries. The prediction of boiling point (BP), octanol‐water partition coefficient (log P), vapor pressure (VP), water solubility (WS), and Henry's law constant (HLC) of fragrance molecules has been validated with a reference data set of 166 organic compounds. Knowing these properties for a fragrance molecule is essential and being able to predict them precisely can be particularly useful in the development of new molecules or in the replacement of controversial molecules regarding safety issues without compromising the overall hedonic accord. Finally, mapping the vapor pressure versus the Henry's law constant and the octanol‐water partition coefficient consistently predicts the note class of the molecules useful for release comparison of captives.
Journal of Molecular Catalysis A-chemical, Feb 1, 2015
ABSTRACT A simple thermo-responsive one-phase microemulsion (μem) is designed to enable the dark ... more ABSTRACT A simple thermo-responsive one-phase microemulsion (μem) is designed to enable the dark singlet oxidation of organic substrates while allowing a straightforward separation of the catalytic surfactant and products in two distinct phases by cooling down the reaction medium. This latter is prepared by combining a small amount (1%) of the catalytic surfactant bis(dimethyldioctylammonium) molybdate, [DiC8]2[MoO4], with the nonionic amphiphile tetraethylene glycol monooctyl ether, C8E4. Tensiometry and dynamic light scattering are used to rationalize the synergy between the two surfactants which strongly interact. The oxidation takes place in the effective one-phase Winsor IV system which separates into two phases (μem + oil, i.e. Winsor I) just by temperature change thanks to the presence of the thermo-sensitive C8E4. The thermal-controlled nanostructured reaction medium is applied to the ene reaction, [4+2] cycloaddition and sulfide oxidation.
International Journal of Pharmaceutics, Oct 1, 2016
Nosocomial infections have emerged as important causes of morbidity and mortality in immunocompro... more Nosocomial infections have emerged as important causes of morbidity and mortality in immunocompromised individuals. In this respect, biocides are widely used in hospitals leading to resistant microorganisms. We show here that cyclodextrins can remarkably boost the virucidal activity of di-n-decyldimethylammonium chloride. These oligosaccharides synergistically work with the biocide affording a noticeable reduction of the active virucide concentration between 40 and 85%. Partial replacement of a significant amount of the biocide by eco- and bio-compatible cyclodextrins whilst maintaining the same activity is of great interest as it allows the reduction of the toxicological drawbacks of classical biocide mixtures.
Colloids and Surfaces A: Physicochemical and Engineering Aspects, Nov 1, 2021
Abstract Hansen Solubility Parameters (HSP) have been shown to be an effective approach for ratio... more Abstract Hansen Solubility Parameters (HSP) have been shown to be an effective approach for rationalizing and predicting the stability of titanium dioxide nanoparticles (TiO2 NPs) dispersions. However, interparticle electrostatic interactions, not considered in Hansen’s approach but taken into account in the DLVO theory, are expected to play a significant role in organic solvents having a notable dielectric constant. Zeta potential ζ of TiO2 P25 NPs was measured in both aqueous and organic media to identify DLVO-stabilized dispersions from those stabilized by more specific NP-solvent interaction. Stability was quantified using a Turbiscan optical device which provides Stokes diameters and Relative Turbiscan Stability Index (RTSI). When the zeta potential of NPs and the dielectric constant of the solvent are both high, the dispersion benefits from additional stabilization while when the electrostatic repulsion is negligible, only the solvents within a Hansen dispersion sphere give stable dispersions. The two interpretations are therefore complementary to describe the behavior of TiO2 dispersions in organic solvents.
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Papers by Véronique Nardello-Rataj