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Formulation of sunscreens with enhancement sun protection factor response based on solid lipid nanoparticles / D. Nesseem in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 33, N° 1 (02/2011)
[article]
Titre : Formulation of sunscreens with enhancement sun protection factor response based on solid lipid nanoparticles Type de document : texte imprimé Auteurs : D. Nesseem, Auteur Année de publication : 2011 Article en page(s) : p. 70-79 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Encapsulation
Lipides
Nanoparticules
Produits antisolairesTags : 'Nanoparticules lipides solides' 'Facteur de protection solaire' 'Produits solaire organique' 'Filtre inorganique' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Les “lipide solide nanoparticules “ (SLN) ont été considérées comme de nouveaux systèmes de délivrance de principes actifs pharmaceutiques et cosmétiques. Le but de cette étude est de développer des systèmes de transporteurs pour des filtres solaires organiques et inorganiques incorporés à une matrice composée de cire de carnauba et décyl oléate. Les formules (F1–F7) ont été préparées avec du butyl methoxydibenzoylmethane et de l’octyl methoxycinnamate comme filtres organiques et le dioxyde de titane (TiO2) a été utilisé comme filtre inorganique. Les deux types de filtres solaires ont été incorporés dans des SLN formulées en utilisant la méthode classique de préparation. Pour évaluer l’effet des pigments sur les nanoparticules, la taille des particules a été mesurée en utilisant l’analyseur de taille de particule Mastersizer. Les propriétés de protection UV de ces formulations ont été examinées par le test d’Indice de protection solaire in vitro (SPF). D’autres paramètres ont été déterminés comme la “ spreayabilité” et la viscosité. Le comportement rhéologique des formulations a également été examiné. Les courbes logarithmiques de la contrainte de cisaillement, de l’indice d’écoulement ont permis de calculé l’indice de consistance. Les formules ont montré un indice d’écoulement de 0.2074–0.4005 indiquant le comportement pseudo plastique des préparations. Des augmentations significatives de valeurs de SPF jusqu’à environ 50 ont été mise en évidence après l’encapsulation des filtres organiques et inorganiques dans la cire de carnauba et le décyl oléate. Ainsi, les "nanoparticules lipides solides" pourraient être des véhicules appropriés pour les filtres solaires organiques et inorganiques. Le mélange approprié de cinnamates, de dioxyde de titane et d’oxyde de Zinc a montré un effet de synergie pour améliorer l’indice de protection solaire (SPF) de préparations cosmétiques. DOI : 10.1111/j.1468-2494.2010.00598.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1468-2494.2010.00598.x Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10914
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 33, N° 1 (02/2011) . - p. 70-79[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012855 - Périodique Bibliothèque principale Documentaires Disponible Study of ionic/nonionic polyurethane dispersions with high solid content and low viscosity using a complex hydrophilic chain-extending agent / Faxing Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 1 (01/2018)
[article]
Titre : Study of ionic/nonionic polyurethane dispersions with high solid content and low viscosity using a complex hydrophilic chain-extending agent Type de document : texte imprimé Auteurs : Faxing Zhang, Auteur ; Xiaoli Wei, Auteur Année de publication : 2018 Article en page(s) : p. 141-148 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Haut extrait sec
Polymères en émulsion
Polyuréthanes
Résistance aux électrolytes
Résistance thermique
Stabilité au stockageTags : 'Dispersion de polymère ionique/non ionique" Polyuréthane 'Agent d'extension chaîne hydrophile complexe' 'Haute teneur en solides' Index. décimale : 667.9 Revêtements et enduits Résumé : An ionic/nonionic polyurethane dispersion with high solid content and low viscosity with a complex hydrophilic chain-extending agent was prepared using isophorone diisocyanate as a hard segment and propylene oxide glycol as a soft segment. The complex hydrophilic chain-extending agent consisted of DPSA and BDSA. The effects of the molar ratio of DPSA/BDSA on the properties of the resultant polyurethane dispersions were studied. The morphologies and properties of the ionic/nonionic PU dispersions were examined using particle-size, TEM, and viscosity analyses. It was found that the ionic/nonionic dispersions possessed wide particle-size distributions due to the addition of the complex hydrophilic chain-extending agent. The ionic/nonionic PU dispersions possessed higher solid content than conventional WPU dispersions because the number and volume percentage of the large particles and small particles of the ionic/nonionic dispersions met the requirements for high solid content. It was observed that the solid content of the ionic/nonionic dispersion increased and then decreased with an increasing molar ratio of DPSA/BDSA. When the ratio ranged from 4:10 to 5:10, the solid content of the ionic/nonionic PU dispersion reached up to 55%. It was also noticed that the apparent viscosity of the ionic/nonionic polyurethane dispersion decreased with an increasing molar ratio of DPSA/BDSA. The complex hydrophilic chain-extending agent consisting of DPSA and BDSA enhanced the solid content and decreased the viscosity of the ionic/nonionic dispersions, which are very important for improving the properties and expanding the applications of PU dispersions. In addition, the ionic/nonionic polyurethane dispersion had good electrolyte-resistance properties, stability at both high and low temperatures, and storage stability. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of ionic/nonionic polyurethane dispersions - Characterization
- RESULTS AND DISCUSSION : Average particle diameter and distribution of the dispersions - Particle morphology of the dispersions - Rheology of the dispersions - The stability of the dispersionsDOI : 10.1007/s11998-017-9965-y En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-9965-y.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30106
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Code-barres Cote Support Localisation Section Disponibilité 19610 - Périodique Bibliothèque principale Documentaires Disponible Sucrose octaesters as reactive diluents for alkyd coatings / Andriy Popadyuk in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
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Titre : Sucrose octaesters as reactive diluents for alkyd coatings Type de document : texte imprimé Auteurs : Andriy Popadyuk, Auteur ; Austin Breuer, Auteur ; James Bahr, Auteur ; Ihor Tarnavchyk, Auteur ; Andriy Voronov, Auteur ; Bret J. Chisholm, Auteur Année de publication : 2018 Article en page(s) : p. 481-488 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diluants
Haut extrait sec
Polyalkydes
RevêtementsTags : 'Diluant réactif' 'Revêtement alkyde' 'Sucrose polyester' de soja' 'Ester d'acide gras saccharose' 'Haute teneur en solides' Index. décimale : 667.9 Revêtements et enduits Résumé : Sucrose octasoyate (SS8) was investigated as a reactive diluent for a medium oil alkyd (MOA). SS8, which is derived from sugar and soybean oil, is 100% biobased, nontoxic, and biodegradable. As a result of its unique molecular architecture, it was expected that SS8 would be an excellent reactive diluent for alkyd coatings. The experiment conducted basically involved the incremental replacement of the MOA with SS8, while maintaining essentially equivalent solution viscosity. The properties of cured coatings were determined using industry standard methods. In general, it was found that SS8 could be used to reduce volatile organic compound content of the coatings, while also reducing drying time (i.e., tack-free time), increasing solvent resistance, and increasing impact resistance. Of the properties measured, the only cured film property that was negatively affected by the use of SS8 was the König pendulum hardness. However, the reduction in König pendulum hardness was only observed when the amount of MOA replaced by SS8 was greater than 10 wt%. Overall, these initial results suggest that SS8 is a very good reactive diluent for alkyd coatings. Note de contenu : - Fig. 1 : The chemical structure of a number of molecules that have been described in the literature as potential reactive diluents for alkyd coating
- Fig. 2 : representative chemical structure of an SS8 molecule. It should be understood that the chemical structure of the soy-based fatty acid ester molecules around a single sucrose core will vary and the distribution will depend on the fatty acid ester profile of the soybean oil used as a starting material
- Fig. 3 : Tack-free time as a function of SS8 content in the coating. Tack-free time was determined according to ASTM D1640
- Fig. 4 : Pendulum hardness as a function of SS8 content for the MOA/SS8 coatings
- Fig. 5 : The variation in solvent resistance with SS8 content for the MOA/SS8 coatings
- Fig. 6 : Direct impact resistance as a function of SS8 content for the MOA/SS8 coatings
- Fig. 7 : The variation in reverse impact resistance with SS8 content for the MOA/SS8 coatings
- Fig. 8 : relative comparison of the properties of coatings 90/10 MOA/SS8 and 75/25 MOA/SS8 to coating 100/0 MOA/ SS8. The spider chart shown in this figure was constructed such that the data point farthest from the center along any given axis is given a value of 1.0 and corresponds to the coating that had the most desired value for that property. For example, coating 75/25 MOA/SS8 exhibited the highest
solvent resistance, highest direct impact resistance, highest reverse impact resistance, lowest VOC content, and shortest drying time (i.e., tack-free time). As a result, a value of 1.0 was assigned to each of these properties for coating 75/25 MOA/SS8. However, for pendulum hardness, coating 100/0 MOA/SS8 exhibited the highest pendulum hardness, and, thus, a value of 1.0 was assigned to this coating on the hardness axis. The other two data points on each axis represent the magnitude of the property for the other two coatings as a fraction relative to the coating with the most desirable value for the property
- Table 1 : A description of the raw materials used for the study
- Table 2 : Compositions of the coating solutions produced
- Table 3 : The coating properties measured and the ASTM methods used to test them
- Table 4 : The solids and VOC content of the coating solutions produced and the biobased content of the cured films derived from the coating solutions
- Table 5 : Drying/curing characteristics of the coatings as determined using ASTM D1640DOI : 10.1007/s11998-017-0016-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0016-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30744
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Evaluating water transport through high solid polyurethane coating using the EIS method / F. Rezaei in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 2 (03/2010)
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Titre : Evaluating water transport through high solid polyurethane coating using the EIS method Type de document : texte imprimé Auteurs : F. Rezaei, Auteur ; F. Sharif, Auteur ; Ali Asghar Sarabi, Auteur ; S. M. Kasiriha, Auteur ; M. Rahmanian, Auteur ; E. Akbarinezhad, Auteur Année de publication : 2010 Article en page(s) : p. 209-217 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Canalisation enterrée' 'Polyuréthane haute teneur solides' 'Coefficient diffusion eau''Spectroscopie électrochimique impédance' Index. décimale : 667.9 Revêtements et enduits Résumé : Buried pipelines are commonly coated with high solid polyurethane to prevent corrosion. The diffusion of water through the coating plays an essential role in the performance and endurance of the coating. This study focuses on the evaluation of water diffusion through polyurethane coatings. The effects of thickness and ambient temperature on water diffusion through polyurethane, which is coated on mild steel and immersed in 3.5% (weight fraction) NaCl solution, are evaluated using electrochemical impedance spectroscopy (EIS). Experimental observations clearly indicate that the water diffusion coefficient strongly depends on service temperature and the thickness of coating. Higher temperature (lower than T g) increases water uptake of the polymer but no measurable changes were observed for the temperature change studied. EIS results show that the mechanism of corrosion does not change in the range of thicknesses and temperature investigated in this study. DOI : 10.1007/s11998-009-9173-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9173-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9067
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Code-barres Cote Support Localisation Section Disponibilité 012083 - Périodique Bibliothèque principale Documentaires Disponible Membrane structured solid nanoparticles – A novel nanotechnology for delivery of cosmetic active ingredients / Gerd H. Dahms in IFSCC MAGAZINE, Vol. 8, N° 3 (07-08-09/2005)
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Titre : Membrane structured solid nanoparticles – A novel nanotechnology for delivery of cosmetic active ingredients Type de document : texte imprimé Auteurs : Gerd H. Dahms, Auteur Année de publication : 2005 Article en page(s) : p. 193-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomolécules actives
Cosmétiques
Nanoparticules
Nanotechnologie
Vitamine ETags : 'Nanoparticules solides' 'Membrane structurée par des nanoparticules' 'Pénétration du tocophérol' Nanocarrière 'Fabrication continue' 'Amplification de SPF' Index. décimale : 668.5 Parfums et cosmétiques Résumé : Lipid nanoparticles have a structure similar to that of nanoemulsions. Their size ranges typically from 50 to 1000 nm. They differ from nanoemulsions in that the lipid core is a solid. The matrix consists of solid lipids or mixtures of lipids. Over the past years it has been demonstrated that solid lipid nanoparticles appear to be a promising drug carrier system for the future. Their occlusion properties reduce transepidermal water loss and can enhance penetration of active ingredients through the stratum corneum. As with all new technologies, some problems with the solid lipid nanoparticle technology need to be solved. One major problem is the homogeneous incorporation of amphiphilic active ingredients into the crystal matrix of the nanoparticles. Actives with an amphiphilic character like tocopherol or retinol cannot be kept homogeneously distributed in the wax structure during the emulsification process. Due to their hydrophilic head group they accumulate at the exterior layer of the nanoparticles together with the surfactant system used. Consequently, homogeneous release over time is not guaranteed and a burst release has to be expected. A second disadvantage is the manufacturing process. Solid lipid nanoparticles can be produced only under high pressure conditions. Also the concentration of the solid particles in the dispersion, which is added to an emulsion, is quite low. To overcome these problems membrane structured solid nanoparticles (MSSN) have been developed. These MSSN systems consist of liquid crystalline membrane systems with extremely low surfactant concentrations. The lateral movement of actives is controlled by amphiphilic solid actives such as ceramides and solid emollients. This guarantees maintenance of the advantageous properties of solid lipid nanoparticles such as retarded release of actives and their protection against chemical decomposition, but it also allows the homogeneous incorporation of amphiphilic actives. Membrane structured solid nanoparticles are produced using a continuous three-phase emulsification technique. This allows protection of heat-sensitive actives against decomposition. The concentration of nanoparticles in the MSSN dispersion can be kept higher than 60% (w/w). Even at these concentrations the nanodispersions keep their flow properties. As a result, they can be easily incorporated into the final formulation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10494
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Code-barres Cote Support Localisation Section Disponibilité 003888 - Périodique Bibliothèque principale Documentaires Disponible