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The best for red and yellow / Frank Kleinsteinberg in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 210, N° 4663 (08/2020)
[article]
Titre : The best for red and yellow Type de document : texte imprimé Auteurs : Frank Kleinsteinberg, Auteur ; Markus Vogel, Auteur Année de publication : 2020 Article en page(s) : p. 15-16 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Additifs
Agents dispersants (chimie)
Agents mouillants
Caractérisation
Jaune
Oxyde de fer
Pigments inorganiques
Potentiel zeta
Rhéologie
Rouge (couleur)
Stabilité au stockage
Taille des particulesIndex. décimale : 667.2 Colorants et pigments Résumé : The author discusses a new additive technology for waterborne iron oxide pigment concentrates.
In decorative coatings, the use of pigment concentrates is a modem and flexible wayto produce coloured paints. Especially in waterborne applications, these concentrates have to be suitable for a broad range of different binder technologies. Because of that, the concentrate formulations are usually free of binders and feature a broad compatibility. Furthermore, the demands in terms of storage stability, colour strength and cost efficiency are very high. These demands are addressed directly to the used additive technology. The additive has to induce outstanding viscosity reduction to achieve the highest pigment loads and the most economic grinding. It has to stabilise the pigments over a long period of time without any change in viscosity and it has to develop maximum colour strength to avoid any waste of expensive pigments.
The most important pigment class in decorative coatings are the iron oxides. Iron oxides are not difficult to wet because of their shape. Iron oxide yellow tends to give dilatant rheology, which can be a disaster when it comes to automatically dosing in a dispensing machine. Iron oxide red, on the other hand, tends to increase the viscosity of pigment concentrates over time.
This paper elucidates to different structures of wetting and dispersing additives, which could be used in waterborne, binder-free pigment concentrates for iron oxides and their performance. It is focused on the stability and the wetting of the pigments, which are reflected by the viscosity reduction, the storage stability of the pigment concentrates and the colouristic properties. For the characterisation of the wetting behaviour and the dispersing efficiency, the zeta potential has been used. In the end, advice and guidelines for formulating iron oxide pigment concentrates will be given.Note de contenu : - Pigment concentrate technology
- Pigment dispersion process
- Electrostatic stabilisation - Zeta potential
- Steric stabilisation
- Discussion of the results
- Particle size andhiding power
- Viscosity and stability
- Zeta potentialEn ligne : https://drive.google.com/file/d/1y0_JPiIZxLA8SxrNLDp3PBsmcTfHJWJH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34450
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 210, N° 4663 (08/2020) . - p. 15-16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21904 - Périodique Bibliothèque principale Documentaires Disponible The characterisation of surface area and surface heterogeneity profiles of hair by inverse gas chromatography / Frank Thielmann in IFSCC MAGAZINE, Vol. 5, N° 3 (07-08-09/2002)
[article]
Titre : The characterisation of surface area and surface heterogeneity profiles of hair by inverse gas chromatography Type de document : texte imprimé Auteurs : Frank Thielmann, Auteur ; Duncan Pearce, Auteur ; Yash K. Kamath, Auteur Année de publication : 2002 Article en page(s) : p. 189-193 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Cheveux -- analyse
Cheveux -- Anatomie
Chromatographie en phase inverseLa chromatographie en phase inverse est un type de chromatographie. La base d'une phase inverse est une phase normale sur laquelle des chaînes alkyles (ou autres selon la polarité recherchée) ont été greffées au niveau des groupes silanols (end-capping).
En général, la phase stationnaire est majoritairement composée de petites particules de silice sur lesquelles on a greffé des fonctions chimiques, le plus souvent de chaines alkyles à 8 ou 18 atomes de carbones. Les fonctions silanols (Si-OH) qui subsistent engendrent des interactions hydrophiles parasites, qui rendent les résultats non reproductibles surtout pour les molécules basiques. Pour éviter cela, la surface de la silice est généralement recouverte par une fonction méthyle et les fonctions silanols ne sont plus libres mais sous la forme (Si-O-CH3), c'est cette étape que l'on appelle "end-capping". Les fonctions chimiques utilisées pour le "end-capping" peuvent toutefois être de nature très diverses et les colonnes de dernières générations résistant à des pH extrêmes sont généralement "end-capped" avec des fonctions proposant une plus grande gène stérique, tel que le tert-butyle (Si-O-C(CH3)3).
Selon le taux de greffage, on obtient une plus ou moins grande résolution.
Cette phase est dite "inverse" car de polaire et hydrophile (sans les "greffes"), la phase devient apolaire et hydrophobe.
Conditionneurs (cosmétique)
Energie de surface
Oxydoréduction
Traitement chimiqueIndex. décimale : 668.5 Parfums et cosmétiques Résumé : In the present paper the surface areas and adsorption potential distributions of nine different hair samples have been determined by Inverse Gas Chromatography (IGC). These samples were subjected to chemical grooming procedures followed by conditioner treatments both of which alter the surface energy of hair. Since surface energy affects the strength of adsorption of molecules on the surface, this can be characterized by determining the adsorption potential distribution of the surface of hair using specific probe molecules. The distribution function reflects the energetic heterogeneity profile of a surface and provides interesting information on the nature and population of surfaces sites of different interaction energy. In this study IGC is shown to be a fast and accurate technique for the determination of these distribution functions. The data can be used to explain the adsorption behavior of various surfactants and conditioners from different formulations and how these surface deposits alter the energy of the fiber surface. The results indicate that chemical reactions such as bleaching (oxidation) and perming (reduction) increase the surface energy of the fiber by increasing the number of acidic anionic groups in the surface of hair and consequently increase the adsorption potential of the surface. The energy of the resulting surface depends on the orientation of adsorbed molecules. For example, coverage of anionic surface by cationic conditioner molecules can result in a decrease in the surface energy because of the projection of lipid chain of the surfactant away from the surface. Although IGC has been used in the study of surface energetics of polymers and fibers, its use in unraveling the surface energetics of hair, especially when hair is subjected to damaging grooming treatments and treatments which alleviate such damage, is novel. This is especially true of bleaching and perming which introduce acidic sites in the hair and treatment with surfactants and conditioners which adsorb on these sites and leave a protective residue in the hair. These residues alter the surface energy of hair. The changes that occur on the outer surface can be determined by wettability measurements. However, the changes that occur by alyerations in porosity (as in perming) and penetration of low molecular weight materials such as surfactants and humectants, and their adsoprtion on the internal surface of hair can be determined only by methods like IGC. The method can be very sensitive depending on the selection of appropriate probe molecules. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10646
in IFSCC MAGAZINE > Vol. 5, N° 3 (07-08-09/2002) . - p. 189-193[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003875 - Périodique Bibliothèque principale Documentaires Disponible The characterisation of vertical fibre and high weave structures of Hereford cattle hide / D. E. Peters in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 67 (Année 1983)
[article]
Titre : The characterisation of vertical fibre and high weave structures of Hereford cattle hide Type de document : texte imprimé Auteurs : D. E. Peters, Auteur ; J. H. Bavinton, Auteur Année de publication : 1983 Article en page(s) : p. 65-69 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données
Caractérisation
Cuirs et peaux -- Analyse
Cuirs et peaux de bovins
Microscopie
Peaux brutes -- Structure
StatistiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Previous workers have identified two types of fibre architecture in hides from hereford cattle which result in weak leather. The two types were called vertical fibre and the intermediate form of vertical fibre and they were considered to be forms of the same condition. In this study it is shown that the two forms (here referred to as vertical fibre and high weave) are clearly separable by microscopy of fresh hides but with more difficulty in the case of split leather. Also, vertical fibre and high weave have a different incidence depending upon the breed of the animal. It is suggested that whereas vertical fibre is a specific condition, high weave is probably a form of the normal weave. Thus it is concluded that vertical fibre and high weave are independent although similar structural forms and they both produce weak leather. Note de contenu : - EXPERIMENTAL : Hide samples - Microscopic examination - Statistical analysis of data
- RESULT : Microscopy - Proportion of weave types
- DISCUSSION : Normal weave - High weaveEn ligne : https://drive.google.com/file/d/1-btsGGH8kQ304i67XhF2HJpT-s6XCNoy/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34187
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 67 (Année 1983) . - p. 65-69[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007130 - Périodique Bibliothèque principale Documentaires Disponible 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 combination between collagen polypeptide and calcium / Li Yanchun in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 3 (05-06/2006)
[article]
Titre : The combination between collagen polypeptide and calcium Type de document : texte imprimé Auteurs : Li Yanchun, Auteur ; Deyi Zhu, Auteur ; Jin Liqiang, Auteur ; Fan Guiyang, Auteur ; Mu Junhua, Auteur Année de publication : 2006 Article en page(s) : p. 123-126 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorption
Caractérisation
Collagène
Ions calcium
PolypeptidesUn polypeptide est une chaîne d'acides aminés reliés par des liaisons peptidiques. On parle de polypeptide lorsque la chaîne contient entre 10 et 100 acides aminés. Au-dessus de 100 acides aminés on parle généralement de protéine.
Parmi eux, les peptides multi-cycliques, les peptides phosphorylés ou encore ceux intégrant des liaisons non-peptidiques ou des peptides conjugués.
Certains polypeptides constituent une famille d'antibiotiques dont les molécules très toxiques n'en permettent qu'un usage très limité. D'autres s’imposent aujourd’hui comme des éléments essentiels à la mise au point de vaccins ou de principes actifs destinés aux traitements de certaines pathologies telles que les cancers, les déficiences hormonales, l’ostéoporose.
Réactions chimiquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The combination between collagen polypeptide and the calcium ion was studied on a basis of preparation of collagen polypeptide from animals’ hide by enzymes. The product of the combination between collagen polypeptide and calcium ion was characterized by Uv-Vis analysis, Fourier transform infrared spectroscopy, scanning electron microscopy and other methods. The results indicated that the reaction between collagen polypeptide and the calcium ion is complicated. It includes the coordination linkage of calcium ion with the carboxyl and the amino groups of collagen polypeptide, ionic linkage of calcium ion and the carboxyl of collagen polypeptide and also absorption of collagen polypeptide and the calcium ion. Note de contenu : - Preparation of collagen polypeptide, CPCA and modified collagen polypeptide
- Reaction mechanism between collagen polypeptide and calciumEn ligne : https://drive.google.com/file/d/1tTtMf0SnLZE_T5XyOixPs0kY2Zmy4dgz/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39146
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