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Surfactant-free emulsions from clay-based particles / Jane Doyle in PERSONAL CARE EUROPE, Vol. 6, N° 2 (04/2013)
[article]
Titre : Surfactant-free emulsions from clay-based particles Type de document : texte imprimé Auteurs : Jane Doyle, Auteur ; Neil Grant, Auteur ; Claire Rees, Auteur Année de publication : 2013 Article en page(s) : p. 95-99 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argile
Emulsions -- Emploi en cosmétologie
Emulsions -- Stabilité
Emulsions pickering
Formulation (Génie chimique)
Particules (matières)Index. décimale : 668.5 Parfums et cosmétiques Résumé : The range of clay-based additives manufactured by Rockwood Additives Limited is perhaps best known for its rheology modification properties in both aqueous and organic based formulations, enabling the formulator to exploit the extremely shear-thinning and thixotropic properties of these products to provide suspension, viscosity and storage stability in formulations that range from high viscosity gels that can be sprayed, to pourable liquids capable of suspending particulates.
In addition to these properties some clay-based products (e.g. Laponite XLG, Mineral Colloid BP and Tixogel MPZ) also offer several less well-known benefits that can be utilised in many different formulations alongside traditional rheology modification. One example is their use as Pickering emulsion stabilisers and this aspect is described in more detail in this article.Note de contenu : - Emulsion stabilisation
- Recommended products
- Varying droplet sizes
- Applications of pickering emulsionEn ligne : https://drive.google.com/file/d/1Ve3wxNAavsJLYjvHtzAjR8VhQtzo2uWA/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18220
in PERSONAL CARE EUROPE > Vol. 6, N° 2 (04/2013) . - p. 95-99[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15016 - Périodique Bibliothèque principale Documentaires Disponible Surfactant-free oil-in-oil emulsion-templating of polyimide aerogel foams / Erin Farrell in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 4 (2022)
[article]
Titre : Surfactant-free oil-in-oil emulsion-templating of polyimide aerogel foams Type de document : texte imprimé Auteurs : Erin Farrell, Auteur ; Sadhan C. Jana, Auteur Année de publication : 2022 Article en page(s) : p. 427-441 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels
Caractérisation
Emulsions
Emulsions -- Stabilité
Gélification
Matériaux mésoporeux
Matériaux poreux
Modèles mathématiques
Mousse (chimie)
PolyimidesIndex. décimale : 668.4 Plastiques, vinyles Résumé : A surfactant-free oil-in-oil emulsion-templating method is presented for fabrication of monolithic polyimide aerogel foams using monomer systems that produce fast sol–gel transition. An aerogel foam is a high porosity (∼90%) material with coexisting meso- and macropores inherent to aerogels with externally introduced micrometer size open cells (macrovoids) that are reminiscent of foams. The macrovoids are introduced in polyimide sol using surfactant-free emulsion-templating of droplets of an immiscible liquid that are stabilized against coalescence by fast sol–gel transition. Three immiscible liquids – cyclohexane, n-heptane, and silicone oil – are considered in this work for surfactant-free emulsion-templating. The aerogel foam monoliths, recovered by supercritical drying, exhibit smaller size macrovoids when n-heptane and cyclohexane are used as emulsion-templating liquid, while the overall porosity and the bulk density show weak dependence on the emulsion-templating liquid. Note de contenu : - EXPERIMENTAL SECTION : Materials - Characterization
- RESULTS AND DISCUSSION : Emulsion stability - Gel times - Aerogel foam materials - BET surface area - Macrovoid and pore architecture
- Table 1 : Lists several properties of the solvents used.
- Table 2 : Interfacial tension values without surfactant
- Table 3 : Mean, median, maximum, and minimum droplet diameter in surfactant-free emulsions in N,N-dimethylformamide
- Table 4 : Droplet distribution data and mean diameter in micrometer in each size range
- Table 5 : Emulsion separation times and creaming rates in polyimide so
- Table 6 : Bulk density, shrinkage, porosity, and percent pores in macro- and mesopore range of emulsion-templated polyimide aerogel foams
- Table 7 : BET surface areaDOI : https://doi.org/10.1515/ipp-2022-4248 En ligne : https://drive.google.com/file/d/1_xRc5_bNKiT5U2NT_gxrCiSs-qCRpbw0/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37918
in INTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 4 (2022) . - p. 427-441[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23739 - Périodique Bibliothèque principale Documentaires Disponible The characterization of Pluronic P123 micelles in the presence of sunscreen agents in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 45, N° 4 (08/2023)
[article]
Titre : The characterization of Pluronic P123 micelles in the presence of sunscreen agents Type de document : texte imprimé Année de publication : 2023 Article en page(s) : p. 470-479 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cosmétiques
Diffusion de neutrons aux petits anglesLa diffusion de neutrons aux petits angles (DNPA) permet de sonder la matière aux échelles spatiales allant de 0.5 et 50 nm en déterminant les grandeurs moyennes qui caractérisent la taille et la forme des objets ainsi que leurs interactions. (https://www.neutron-sciences.org)
Emulsions -- Emploi en cosmétologie
Emulsions -- Stabilité
Formulation (Génie chimique)
Peau -- Soins et hygiène
Pénétration cutanée
Produits antisolaires
Surfactants
Systèmes de livraison (pharmacie)
VectorisationIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objectives : The triblock copolymer Pluronic® is widely used in the personal care industry, including sun protection, for its film-forming and solubilization capabilities. In this study, the effect of three commonly used organic UV filters (ethylhexyl methoxycinnamate [EMC], ethylhexyl triazone [EHT], and avobenzone [AVB]) on the structure of Pluronic P123 micelles was investigated.
- Methods : The Pluronic P123 micelle structure has been investigated using dynamic surface tension, nuclear magnetic resonance (NMR) and small-angle neutron scattering (SANS).
- Results : Dynamic surface tension results show strong interactions between the UV filters and Pluronic® evident by sharp changes in the surface activity of the latter. The NMR results have revealed the creation of a hydrophobic microenvironment special to the Pluronic PPO core group in the presence of UV filters. Some interaction with the hydrophilic EO was also recorded, albeit weaker. This is further confirmed by SANS, where the Pluronic P123 micelles interacted with varying strengths with the UV filters, resulting in sharp changes in their size and shape.
- Conclusions : We have demonstrated the sensitivity of the Pluronic P123 micelles to the presence of various UVA/B filters. The micelles shape varied from spherical to cylindrical as the concentration and type of the UV filters were varied. These variations in the shape are expected to have a significant effect on the sun protection factor (SPF), as it affects the solubilization of the UV filters within a formulation in addition to the formulations' rheological profile and film-forming behaviour.Note de contenu : - MATERIALS
- METHODS : Preparation of Pluronic- UV filters solutions - Tensiometry - Nuclear magnetic resonance (NMR) - Small-angle neutron scattering (SANS)
- RESULTS AND DISCUSSION : Dynamic surface tension (DST) - Nuclear magnetic resonance (NMR) - Small-angle neutron scattering (SANS)
- Table 1 : SANS fitting parameters from P123 micelles (5 wt%) and EMC at different concentrations, in 10 wt% d6-ethanol and D2O, at 25°C - Table 2 : SANS fitting parameters from P123 micelles (5 wt%) and EHT at different concentrations, in 10 wt% d6-ethanol and D2O, at 25°CDOI : https://doi.org/10.1111/ics.12856 En ligne : https://drive.google.com/file/d/1wdAZR7CDALEhDuF0wkFrCPffAYeR-o2E/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39877
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 45, N° 4 (08/2023) . - p. 470-479[article]The characterization of the semi-solid W/O/W emulsions with low concentrations of the primary polymeric emulsifier / D. Vasiljevic in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 27, N° 2 (04/2005)
[article]
Titre : The characterization of the semi-solid W/O/W emulsions with low concentrations of the primary polymeric emulsifier Type de document : texte imprimé Auteurs : D. Vasiljevic, Auteur ; G. Vuleta, Auteur ; M. Primorac, Auteur Année de publication : 2005 Article en page(s) : p. 81-87 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Emulsions -- Emploi en cosmétologie
Emulsions -- Stabilité
Emulsions multiples
Rhéologie
Surfactants
Taille des gouttelettesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : Les émulsions H/L/H semi-solides ont été formulées avec les concentrations basses (0.8, 1.6 et 2.4% m/m) de l'émulsifiant lipophile polymèrique PEG-30-dipolyhydroxystearate. Les émulsions simples et multiples ont été préparées avec la teneur élevée en phase intérieure (phi1 = phi2 = 0.8). La teneur en émulsifiant lipophile était la seule différence entre ces formulations. L'aspect macroscopique et microscopique, la taille de globules, la stabilité physique déterminée par le test de centrifugation ainsi que le comportement rhéologique (rhéologie d'écoulement et oscillatoire) ont permis l'évaluation des émulsions multiples. Il est possible de formuler les émulsions H/L/H semi-solides multiples avec les concentrations basses de PEG-30-dipolyhydroxystearate comme émulsifiant primaire. Il a été découvert que l'émulsion H/L/H multiple avec le plus grand pourcentage (2.4% m/m) de l'émulsifiant primaire a le diamètre de globule le plus petit, la plus grande viscosité apparente et le plus grand module élastique ainsi que la plus longue stabilité. DOI : 10.1111/j.1467-2494.2004.00247.x En ligne : https://onlinelibrary.wiley.com/doi/10.1111/j.1467-2494.2004.00247.x Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4426
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Code-barres Cote Support Localisation Section Disponibilité 004009 - Périodique Bibliothèque principale Documentaires Disponible The effect of particle size on the characteristics and performance of emulsion binders and topcoats / T. J. Braithwaite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
[article]
Titre : The effect of particle size on the characteristics and performance of emulsion binders and topcoats Type de document : texte imprimé Auteurs : T. J. Braithwaite, Auteur Année de publication : 1978 Article en page(s) : p. 82-86 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colloides
Cuirs et peaux -- Finition
Emulsification
Emulsions
Emulsions -- Stabilité
Laque et laquage
Liants
Polymères en émulsion
Polyuréthanes
Taille des particulesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The term emulsion, as applied to coating binders as is known today, is, in fact, a misnomer since by definition an emulsion is a mixture of two or more immiscible liquids, and binders are a mixture of an immiscible solid and a liquid. The correct terminology should thus be a resin dispersion but, for the sake of convenience, will always be referred to as "emulsion".
Aqueous polymers exist as three specific types. These types vary very significantly in both physical and mechani-cal properties. These three types are aqueous dispersions or emulsions, colloidal dispersions and true solutions.
Aqueous dispersions, or emulsions as they are commonly known, can be defined as discrete particles of high molecular weight polymer dispersed in an aqueous medium. The solid polymer is known as the disperse phase, while the water is the disperse medium.
Colloidal dispersions can be considered to be ultra-fine particles or molecular weight intermediates between that of aqueous dispersions and true solutions. The polymers contain polar groups, either acidic or basic, which do impart some degree of solubility. The colloidal dispersions can also be considered as hybrids of dispersions and true solutions, in that they possess properties which are common and characteristic of both types. True solutions, or water reducible resins, are polymers in which polymerisation reactions are performed in water miscible organic solvents such as esters and alcohols, or solubilised by the addition of alkali, i.e. neutralisation. Solubility is also attributed to polar groups on the polymer side chains. The polymers are thus totally soluble in the medium water.
The above generalisation will thus suffice to explain the varions "states" in which aqueous polymers are available. Emulsions find application in the function as binders or topcoats for leather finishing, while colloidal dispersions are used to a smaller extent as thickeners for the finish mixes and more commonly, as pasting adhesives. Water reducible urethane lacquers are also the colloidal dispersions type. True solutions are not currently used in leather finishing but are in the paint industry, particularly the automotive and appliance industries.Note de contenu : - TYPES OF EMULSIONS
- SURFACE ACTIVE AGENTS
- THE EMULSIFICATION PROCESS
- MEASUREMENT OF PARTICLE SIZE DISTRIBUTION : Measurement of particle size distribution : The electron microscope - Sedimentation method - Soap titration method - Light scattering method - General remarks
- THE EFFECT OF PARTICLE SIZE ON THE NATURE OF THE EMULSION, EMULSION POLYMERS AND BINDERS : Emulsion stability - Viscosity - Solids - Nitrocellulose lacquer emulsions
- THE EFFECT OF PARTICLE SIZE ON THE EFFECT OF PARTICLE SIZE ON THE PERFORMANCE OF THE EMULSION-BASED FINISHING SYSTEMS : Properties improved by increasing particle size - Disadvantages of fine particle emulsionsEn ligne : https://drive.google.com/file/d/1EKuMbEz4pgpYU_3wKzkdO2M4Th7KcxAl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35222
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 61 et 62 (Années 1977 et 1978) . - p. 82-86[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008597 - Périodique Archives Documentaires Exclu du prêt The effect of particle size on the characteristics and performance of emulsion binders and topcoats / T. J. Braithwaite in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 4 (07-08/1978)
PermalinkThe influence of natural gelling agents on the foaming behaviour and foam structure in surfactant systems / Gina marin Velasquez in SOFW JOURNAL, Vol. 146, N° 1-2 (01-02/2020)
PermalinkThe influence of processing variables on performance of O/W emulsion gels based on polymeric emulsifier (Pemulen ®TR-2NF) / S. Simovic in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 21, N° 2 (04/1999)
PermalinkThermoresponsive latexes for fragrance encapsulation and release / N. Popadyuk in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 38, N° 2 (04/2016)
PermalinkUndertanding thickening stabilising polymers / Alicia Roso in PERSONAL CARE EUROPE, Vol. 3, N° 3 (09/2010)
PermalinkVOC free water thinnable coatings based on unsaturated polyester / Anuradha Satpute in PAINTINDIA, Vol. LVIII, N° 7 (07/2008)
PermalinkVolarest FL : la rhéologie au coeur du sprayable / Bernice Ridley in EXPRESSION COSMETIQUE, N° Hors série (12/2014)
PermalinkWater hardness as an important parameter of the fatliquoring process / Krzysztof Smiechowski in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)
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