Literatura académica sobre el tema "Émulsions de Pickering – Propriétés physico-chimiques"
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Artículos de revistas sobre el tema "Émulsions de Pickering – Propriétés physico-chimiques":
SY, Papa Mady, Sidy Mohamed DIENG, Alphonse R. DJIBOUNE, Mamadou SOUMBOUNDOU, Louis Augustin DIOUF, Gora MBAYE, Boucar NDONG y Mounibé DIARRA. "Nanoémulsions de Pickering stabilisées par des nanoparticules d’hydroxyde de magnésium : formulation et caractérisation physico-chimique". Journal Africain de Technologie Pharmaceutique et Biopharmacie (JATPB) 2, n.º 3 (20 de diciembre de 2023). http://dx.doi.org/10.57220/jatpb.v2i3.78.
Tesis sobre el tema "Émulsions de Pickering – Propriétés physico-chimiques":
Douyère, Grégory. "Émulsions de Pickering stimulables stabilisées par des polymères : élaborations, caractérisations et applications catalytiques et pharmaceutiques". Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR048.
Emulsions are micro-dispersed systems conventionally stabilized by surface active molecules. Due to their potentially negative impact on the environment, surfactants tend to be replaced by colloidal particles leading to Pickering emulsions. These emulsions are now enjoying a renewed interest, particularly in the field of catalysis. Indeed, the use of particles responding to specific stimuli such as pH or temperature allows to control the type of emulsion or even its destabilization, which can present an undeniable advantage at the end of a reaction. The objective of this work was therefore to develop new Pickering emulsion systems based on reactive particles. First, we focused on two type of polymeric particles, poly(4-vinylpyridine) (P4VP), sensitive to pH and salt, and polyethyleneimine (PEI), sensitive to pH and temperature. The emulsions obtained in the presence of different oils were characterized and the effects of pH, temperature and salt addition were studied demonstrating the reversibility of the systems under the action of these stimuli. In a second step, emulsions with antibacterial, antifungal and antibiofilm properties were elaborated from the self-assembly of cyclodextrins and phytochemical oils through insoluble inclusion complexes. These emulsions proved to be very effective in the fight against pathogens. Finally, Pickering interfacial catalysis was successfully applied to the synthesis of adipic and suberic acids by combining tri(dodecyltrimethylammonium) phosphotungstate [C12]3[PW12O40], silica grafted with alkyl and sulfonic groups, C18/C3SO3H@SiO2, and acidic phosphate salts as co-catalysts. Under optimal conditions, quantitative olefin conversion associated with boosted acid yields to 70 and 65 % in the presence of Na2HPO4 and (C12)H2PO4, respectively. These additives potentiate the particles self-assembly. The existence of these systems relies on the adaptability of the particles to specific environments and show that their physicochemical properties can be tuned to confer the desired characteristics
Leal-Calderon, Fernando. "Contribution à l'étude des propriétés physico-chimiques des émulsions de bitume". Bordeaux 1, 1992. http://www.theses.fr/1992BOR10559.
Laredj, Bourezg Faïza. "Émulsions stabilisées par des particules polymériques biodégradables : études physico-chimiques et évaluation pour l'application cutanée". Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10128/document.
The so-called Pickering stabilization is based on the use of solid particles instead of emulsifiers. Their strong adsorption at interfaces confers rigidity preventing them from coalescence. This work is divided into four main parts. The first part deals with the manufacture of these particles and their physicochemical characterization. A second part deals with the O/W emulsions formulation according to two different methods and their characterization. The third part is an investigation into the behavior of these particles at the O/W interface by small angle neutron scattering. The last part deals with the evaluation of these emulsions for their application to skin delivery. This work aims at the preparation of Pickering emulsions using biodegradable polymeric particles. Individual particles formed from diblock copolymers such as: PCL-b-PEG and PLA-b-PEG, were made by an innovative nanoprecipitation process. They were characterized in terms of their size and stability. Their internal structure was also investigated by NMR and cryo-TEM. Their ability to stabilize highly concentrated O/W emulsions has been demonstrated. The impact of the emulsification process on the final properties was emphasized and the adsorption of particles as tight necklaces at the interface was visualized by neutron scattering and freeze-fracture electron microscopy. The skin absorption of retinol from these innovative emulsions showed enhanced accumulation of the asset in the stratum corneum compared to conventional surfactant-stabilized emulsions. Such skin absorption of retinol was shown to depend on the manufacturing method of the emulsions. Particles in aqueous suspension were also tested for encapsulation and delivery of retinol in skin. The results showed the influence of the internal structure of the particles (PCL or PLA) on the absorption of retinol in the skin. The use of biodegradable polymers brings new perspectives in the formulation of Pickering emulsions for cosmetic or pharmaceutical use, while avoiding the effects of inorganic particles considered hazardous to human health
Frelichowska, Justyna. "Émulsions stabilisées par des particules solides : études physico-chimiques et évaluation pour l'application cutanée". Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00370654.
1) l'étude des aspects physico-chimiques des émulsions ; 2) l'évaluation des émulsions stabilisées par des solides pour l'application cutanée.
Les émulsions ont été stabilisées avec des nanoparticules de silice de caractère hydrophobe varié. Les émulsions huile-dans-eau obtenues avec de la silice partiellement hydrophobe ont été caractérisées en termes de stabilité, rhéologie et de quantité optimale de particules nécessaires pour la stabilisation. Les particules de silice hydrophile stabilisent les émulsions H/E avec des huiles très polaires. Le rôle de l'agrégation des particules en présence d'huile et d'électrolyte dans la stabilisation des émulsions a été souligné. Dans un deuxième temps, nous avons étudié l'absorption de principes actifs dans la peau, à partir des émulsions de Pickering, et nous avons comparé les résultats avec les émulsions classiques stabilisées par les tensioactifs. Les émulsions H/E et E/H avec des principes actifs modèles (rétinol comme molécule lipophile et caféine comme molécule hydrophile) ont été étudiées en terme d'absorption dans la peau. L'absorption des principes actifs a été significativement différente pour les émulsions stabilisées par des particules solides et pour les émulsions stabilisées par des molécules de tensioactif. Les émulsions de Pickering constituent une nouvelle formulation pour l'application cutanée.
Charbonnier, Patrick. "Étude des relations entre les propriétés physico-chimiques d'une émulsion et son pouvoir lubrifiant". Nancy 1, 1990. http://www.theses.fr/1990NAN10514.
Salou, Martine. "ARelation entre la stabilité et les propriétés macroscopiques des émulsions de bitumes et les propriétés physico-chimiques et interfaciales des bitumes". Mulhouse, 1996. http://www.theses.fr/1996MULH0020.
Langenfeld, Anne. "Emulsions concentrées inverses : relation entre le comportement rhéologique et les propriétés physico-chimiques : application au processus d'émulsification". Nancy 1, 1999. http://www.theses.fr/1999NAN10255.
Bérépion, Bastien. "Incidence de la composition chimique et des propriétés physico-chimiques des gommes en acacia sur leurs propriétés en émulsion". Le Havre, 2011. http://www.theses.fr/2011LEHA0013.
Acacia gum is an exudate from Acacia senegal var senegal commonly used in food and pharmaceutical industry as emulsifier and stabilizer (E414). The aim of this thesis, in partnership with Allan & Robert, was to study the relationship between chemical composition, physic-chemical properties, functional properties and environmental conditions of acacia gums synthesis and harvest. At first, studying raw gums show the influence of geographic origin and post-harvest storage condition on the acacia gums chemical composition and physic-chemical properties. Then, we confirm the important role of AGP fraction in emulsions properties into correlating the AGP percent with the emulsifying properties, the aromatic amino acid proportion in the fraction with the emulsion stability and the aggregates negative effect on the emulsion properties. Furthermore, a relation appears between emulsions quality and protein percent in gums. Finally, we highlighted the atomization process influence on physic-chemical and functional properties of acacia gums
Terescenco, Daria. "Evaluation et compréhension de la structure de l’émulsifiant et son impact sur les propriétés physiques, physico-chimiques et sensorielles d’émulsions cosmétiques". Thesis, Normandie, 2018. http://www.theses.fr/2018NORMLH05/document.
Emulsifier is a raw material widely used in formulated systems of emulsion type. Due to its amphiphilic chemical structure, this molecule decreases the interfacial tension between two immiscible liquids that form an emulsion, which increases the stability of the system over time. In addition, it can form liquid crystals in the formulated systems because of its structure and this has a considerable impact on the physicochemical and applicative properties of emulsions. The objective of this project is to study a natural alkyl polyglucoside/fatty alcohol mixed surfactant. Its properties were first investigated via the construction of the phase diagram. Thus, it has been shown that the variation of the concentration and of the ratio of alkyl polyglucoside/fatty alcohol in the mixed emulsifier favors the transition between the micellar solutions towards liquid crystals of lamellar or hexagonal type in the studied systems. Next, the mastering of the binary systems properties allowed understanding the metamorphoses undergone by the system when an oil phase is incorporated into it. The chemical structure of emollients (presence of heteroatoms) affects the organization of liquid crystals formed by the amphiphilic molecules. Therefore, depending on the emollient type, the microscopic and macroscopic properties of the systems change (droplet sizes and distribution, rheological, thermal and texture profile). Finally, the applicative properties of emulsions are also affected, as shown by sensory analysis and in-vivo biometric measurements
Delforce, Lucie. "Nouvelles méthodologies pour la caractérisation des particules, des huiles complexes et des tensioactifs : relations entre structures chimiques, propriétés physicochimiques et propriétés applicatives". Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR042.
The multiple aims of this thesis fall within the implementation of a new HT-SMART-FORMU technological platform dedicated to formulation science. The focus is set on the development of reliable experimental methods, theoretical and predictive tools, so as to establish relations between chemical composition, physicochemical properties and applicative properties.The first type of systems investigated in this work consists of solid dispersions. Their stability has long been approached by the DLVO theory, but more recent studies suggest the use of Hansen Solubility Parameters to describe their stability in non-aqueous media. In the first chapter, a systematic analytical method based on zeta potential measurement and light scattering stability monitoring allows deducing a complementarity of both theories to describe the stability of TiO2 dispersions in non-aqueous solvents.The problematic of oil hydrophobicity prediction through EACN values modelling, which is a key parameter to design surfactant/oil/water (SOW) dispersed systems, is addressed in the second chapter. Two mathematical models, designed using machine-learning methods, are proposed for the rapid prediction of the EACN of oils, namely Neural Networks (NN) and Graph Machines (GM). While the GM model is implemented from the SMILES codes, the NN model is fed with σ-moments descriptors computed with the COSMOtherm software. The prediction reliability of both models is discussed based on a complex 10-molecule test set.In chapters 3 and 4, the scope of applicative properties of a nonionic glycerol-based surfactant are investigated. Firstly, chapter 3 focuses on its aggregation behavior in aqueous solutions and the formation of liquid crystals (LC) at low concentration, in comparison with the benchmark polyethoxylated fatty alcohols and alkyl polyglucosides. The influence of its physicochemical properties, in particular the air / water interface dilational viscoelasticity, is put in relation with the observed poor foamability and long-lasting foam stability.Finally, C12Gly2 properties in SOW systems are investigated in chapter 4. The Normalized Hydrophilic-Lipophilic Deviation (HLDN), a powerful theoretical tool, is regarded as a way to rationalize the characteristics of both emulsions and microemulsions. In this way, a thorough quantification of surfactants amphiphilicity, temperature sensitivity and salt-tolerance are presented. The potential use of C12Gly2 as O/W and W/O emulsifier is then investigated: the granulometry and stability of emulsions obtained by varying the oil concurs with HLDN values. A minimum is observed at HLDN = 0 and increases for negative and positive HLDN values