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Numerical modelling of the non-isothermal flow of a non-newtonian polymer in a co-kneader / L. Sardo in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 4 (08/2017)
[article]
Titre : Numerical modelling of the non-isothermal flow of a non-newtonian polymer in a co-kneader Type de document : texte imprimé Auteurs : L. Sardo, Auteur ; Bruno Vergnes, Auteur Année de publication : 2017 Article en page(s) : p. 425-433 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle
Eléments finis, Méthode des
Extrudeuse monovis
Fluides non newtoniens
Malaxeurs et mélangeurs
Modèles mathématiques
Modèles numériquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : The co-kneader is a particular single-screw extruder with pins fixed on the barrel, interrupted screw flights, and a screw with both rotational and reciprocating motions. The co-kneader is principally used for its excellent mixing capacities. In order to calculate the flow in the co-kneader, we developed a simplified Hele-Shaw model which takes into account the mixing pins and the reciprocating motion of the screw. In this paper we describe the model and the effects of the reciprocating motion and the presence of mixing pins on the polymer flow. Note de contenu : - FLOW MODELLING : Usual approximations - Mechanical model - Non-isothermal model
- SIMULATION : Finite element method - Oscillating motion
- EXAMPLES OF RESULTS
- EXPERIMENTAL VALIDATIONDOI : 10.3139/217.3350 En ligne : https://drive.google.com/file/d/1ZwPlQgnYfobYgAAAuS8rP1qOAKqmtxy8/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28899
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 4 (08/2017) . - p. 425-433[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19165 - Périodique Bibliothèque principale Documentaires Disponible Olive leaf-derived PPAR agonist complex induces collagen IV synthesis in human skin models / George P. Majewski in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 6 (12/2021)
[article]
Titre : Olive leaf-derived PPAR agonist complex induces collagen IV synthesis in human skin models Type de document : document électronique Auteurs : George P. Majewski, Auteur ; Smrita Singh, Auteur ; Krzysztof Bojanowski, Auteur Année de publication : 2021 Article en page(s) : p. 662-676 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiâge
Barrière cutanée
Cellules -- Cultures et milieux de culture
Collagène
Collagène -- Synthèse
Dermo-cosmétologie
Extraits de plantes:Extraits (pharmacie)
Modèles numériques
Olivier et constituants
Peau -- Soins et hygiène
Peau humaineIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Introduction : Peroxisome proliferator-activated receptor (PPAR) agonists are known to modulate the synthesis of dermal lipids and proteins including collagens. Olive (Olea europaea) leaves have been reported to contain PPAR-binding ligands. Collagen IV, a major dermal-epidermal junction (DEJ) protein, degrades with both age and disease. Here, we report the formulation of a novel multi-ligand complex, Linefade, and its effects on collagen IV synthesis.
- Methods : Linefade prepared from the leaves of Olea europaea contains 2% w/w plant extract solids dissolved in a mixture of glyceryl monoricinoleate and dimethyl isosorbide. In silico docking was performed with PPAR-α (PDB ID: 2P54). Linefade was evaluated for PPAR-α-dependent transcription in a luciferase reporter assay system. Cell viability and collagen IV levels in human dermal fibroblast cultures were measured using the MTT method and ELISA assay, respectively. Transcriptome analysis was conducted on a full-thickness reconstituted human skin (EpiDermFT) model. Ex vivo cell viability and collagen IV immunostaining were performed on human skin explants.
- Results : In silico docking model of the major constituents (oleanolic acid and glyceryl monoricinoleate) produced a co-binding affinity of −6.7 Kcal/mole. Linefade significantly increased PPAR-α transcriptional activity in CHO cells and collagen IV synthesis in adult human dermal fibroblasts. Transcriptome analysis revealed that 1% Linefade modulated the expression of 280 genes with some related to epidermal differentiation, DEJ, PPAR, Nrf2 and retinoid pathways. An ex vivo human explant study showed that 1% Linefade, delivered via a triglycerides excipient, increased collagen IV levels along the dermal–epidermal junction by 52%.
- Conclusion : In silico modelling and in vitro and ex vivo analyses confirmed Linefade-mediated activation of PPAR-α and stimulation of collagen IV synthesis.Note de contenu : MATERIALS AND METHODS : Materials - Preparation of linefade - In silico modelling technique and validation - In vitro cell studies - Assay on reconstituted skin substitutes - Ex vivo study - Statistical analysis
- RESULTS : In silico modelling - In vitro cell studies - Transcriptome analysis - Human explants (Collagen IV)DOI : https://doi.org/10.1111/ics.12742 En ligne : https://drive.google.com/file/d/1BeDt-gYbDKZbvjDvfvDYue6axRMi-oNy/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37048
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 6 (12/2021) . - p. 662-676[article]Optimization and scale-up of twin-screw reactive extrusion : the case of EVA transesterification / Françoise Berzin in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 5 (11/2020)
[article]
Titre : Optimization and scale-up of twin-screw reactive extrusion : the case of EVA transesterification Type de document : texte imprimé Auteurs : Françoise Berzin, Auteur ; C. David, Auteur ; Bruno Vergnes, Auteur Année de publication : 2020 Article en page(s) : p. 422-428 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymère éthylène acétate de vinyle
Esterification
Extrudeuse bi-vis
Extrusion réactive
Modèles numériquesIndex. décimale : 668.4 Plastiques, vinyles Résumé : Despite its complexity, reactive extrusion is continuously developing for the production of new and performing materials. Due to the strong coupling between flow, rheology and chemistry, optimizing this process for a given reaction remains a difficult task. Moreover, the scale-up from the laboratory to the production scale is another crucial question, which cannot be solved by conventional techniques. In this paper, we show how the use of numerical modeling may help answer these complex questions by providing realistic solutions, rapidly and without excessive costs. The example of a transesterification reaction was chosen because this reaction has been carefully characterized in previous studies. The reaction kinetics and the kinetic constants are well known and the modeling of this reactive extrusion process has proved to be realistic and accurate. Note de contenu : - CASE STUDY AND METHODOLOGY : EVA transesterification - Modeling
- OPTIMIZATION : Optimization of processing parameters - Optimization of screw profile
- SCALE-UPDOI : https://doi.org/10.3139/217.3958 En ligne : https://drive.google.com/file/d/1GwITc2fxsXwSC452KIaZof-rXRs03tPh/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35064
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Code-barres Cote Support Localisation Section Disponibilité 22388 - Périodique Bibliothèque principale Documentaires Disponible Perméabilité des renforts fibreux / Bertrand Laine in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 15, N° 3 (2005)
[article]
fait partie de Vol. 15, N° 3 - 2005 - Mise en forme des matériaux composites : journée scientifique et technique - AMAC (Bulletin de REVUE DES COMPOSITES ET DES MATERIAUX AVANCES) / Guy Bouquet
Titre : Perméabilité des renforts fibreux : Étude des écarts expériences-prédictions Type de document : texte imprimé Auteurs : Bertrand Laine, Auteur ; Fabrice Boust, Auteur ; Philippe Boisse, Auteur ; Gilles Hivet, Auteur ; Stepan V. Lomov, Auteur ; Alain Fanget, Auteur Année de publication : 2005 Article en page(s) : p. 385-400 Note générale : Bibliogr. Langues : Français (fre) Catégories : Composites à fibres
Modèles numériques
Modélisation tridimensionnelle
Moulage par transfert de résine sous vide
Perméabilité
StatistiquesIndex. décimale : 620.19 Autres matériaux Résumé : La connaissance de la perméabilité des renforts fibreux est indispensable à la simulation du procédé RTM. Nous présentons ici une "chaîne numérique" permettant, à partir d'une modélisation tridimensionnelle d'un renfort fibreux, de déterminer sa perméabilité. Les valeurs numériques sont comparées à des résultats expérimentaux et des images de microtomographie sont utilisées afin de valider les modèles 3D. Les écarts relevés entre ces différents résultats sont étudiés à la lumière des incertitudes, erreurs et variations statistiques aussi bien expérimentales que numériques. DOI : 10.3166/rcma.15.385-400 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6143
in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 15, N° 3 (2005) . - p. 385-400[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 011539 - Périodique Bibliothèque principale Documentaires Disponible Permeability coefficients and vapour pressure determination for fragrance materials / Rafael N. Almeida in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE, Vol. 43, N° 2 (04/2021)
[article]
Titre : Permeability coefficients and vapour pressure determination for fragrance materials Type de document : document électronique Auteurs : Rafael N. Almeida, Auteur ; João G. M. Hartz, Auteur ; PatrÃcia F. Costa, Auteur ; Alirio E. Rodrigues, Auteur ; Rubem M. F. Vargas, Auteur ; Eduardo Cassel, Auteur Année de publication : 2021 Article en page(s) : p. 225-234 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Evaporation
Franz, Cellules de
Modèles numériques
Parfums
Pénétration (physique)
StatistiquesIndex. décimale : 668.5 Parfums et cosmétiques Résumé : - Objective : This study aims to correlate new experimental data relevant to the description of the combined evaporation/permeation process of a perfume applied onto the skin.
- Methods : The vapour pressure data were measured by thermogravimetric analysis (TG-DTA). The Antoine constants and the Clarke and Glew parameters were determined for the same set of fragrance molecules to describe its low vapour pressures at new temperature ranges. The permeability coefficient of a set of 14 fragrance molecules in ethanolic solution was determined by Franz diffusion cell experiments, using porcine skin. The samples were analysed by gas chromatography with a flame ionization detector (GC/FID) and high-performance liquid chromatography with UV visible detector (HPLC/UV). A QSAR model was proposed to correlate the experimental data.
- Results : The Antoine constants were determined and presented low standard deviations. The Clarke and Glew physically significant parameters were obtained along with its statistical analysis. The fitting is good since the magnitude order is in accordance with the literature, associated with the low correlation between the estimated parameters and low standard deviations. The presented correlation, based on a mixture using only ethanol as solvent, showed better results than previous QSAR models with a standard relative deviation (δr) of 0.190, a standard error (SE) of 0.397 and a determination coefficient (R2) of 0.7786.
- Conclusion : The dataset is still small compared to larger and more general QSAR models; however, it is much more specific as to the type of solvent and class of materials studied. This work represents an advance for the modelling of the perfume diffusion process since it specifies important properties that until then had been treated in a more general way.Note de contenu : - MATERIALS AND METHODS : Chemicals - Pig ears skin preparation - In vitro skin permeation - Quantification - Vapour pressure - Permeability coefficient and QSAR model
- RESULTS AND DISCUSSION : Vapour pressure - Permeability coefficient
- Table 1 : Properties of the fragrance materials
- Table 2 : Antoine estimated vapour pressure parameters
- Table 3 : Parameters of Clarke and Glew equation derived from vapour pressure data at the reference temperatureθ = 298.15 K and pressureP0 = 105 Pa
- Table 4 : Experimental and correlated skin permeability coefficients of the studied fragrance materialsDOI : https://doi.org/10.1111/ics.12686 En ligne : https://drive.google.com/file/d/18HTF-vxqg4d2pCyRDXWoFdF7xZbCKBPZ/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35874
in INTERNATIONAL JOURNAL OF COSMETIC SCIENCE > Vol. 43, N° 2 (04/2021) . - p. 225-234[article]Powdered hide model for vegetable tanning II : hydrolyzable tannin / Eleanor M. Brown in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 1 (01/2015)
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