Analysis of keratin films as screening tools for predicting the efficacy of potential haire dyes / Tova N. Williams in COLORATION TECHNOLOGY, Vol. 135, N° 4 (08/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 4 (08/2019) . - p. 253-266 Titre : Analysis of keratin films as screening tools for predicting the efficacy of potential haire dyes Type de document : texte imprimé Auteurs : Tova N. Williams, Auteur ; Harold S. Freeman, Auteur Année de publication : 2019 Article en page(s) : p. 253-266 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Teinture Colorants -- Analyse Colorants acides Couches minces kératines La kératine est une protéine, synthétisée et utilisée par de nombreux êtres vivants comme élément de structure, et également l'exemple-type de protéine fibreuse. La kératine est insoluble, et peut être retrouvée sur l'épiderme de certains animaux, notamment les mammifères, ce qui leur garantit une peau imperméable. Parfois, lors d'une friction trop importante, la kératine se développe à la surface de la peau formant une callosité. Les cellules qui produisent la kératine meurent et sont remplacées continuellement. Les morceaux de kératine qui restent emprisonnés dans les cheveux sont couramment appelés des pellicules. La molécule de kératine est hélicoïdale et fibreuse, elle s'enroule autour d'autres molécules de kératine pour former des filaments intermédiaires. Ces protéines contiennent un haut taux d'acides aminés à base de soufre, principalement la cystéine, qui forment un pont disulfure entre les molécules, conférant sa rigidité à l'ensemble. La chevelure humaine est constituée à 14 % de cystéine. Il y a deux principales formes de kératines : l'alpha-kératine, ou α-keratin, présente chez les mammifères notamment, dont l'humain, et la bêta-kératine, ou β-keratin, que l'on retrouve chez les reptiles et les oiseaux. Ces deux types de kératines ne présentent clairement pas d'homologie de séquence. Chez l'être humain, la kératine est fabriquée par les kératinocytes, cellules se trouvant dans la couche profonde de l'épiderme. Les kératinocytes absorbent la mélanine (pigment fabriqué par les mélanocytes), se colorent et ainsi cette pigmentation de l'épiderme permet de protéger les kératinocytes des rayons ultraviolets du Soleil. (Wikipedia) Orange (couleur) Produits capillaires Index. décimale : 668.5 Parfums et cosmétiques Résumé : The technology for generating high quality keratin films has recently advanced and led to their implementation in a variety of applications. As an initial step toward investigating the films as a screening tool for predicting the efficacy of potential hair dyes, CI Acid Orange 7 was applied to a set of opaque and translucent films. Overlaid time‐of‐flight secondary ion mass spectrometry images arising from protein and dye fragments revealed that dye uniformly penetrated both film types. Results also showed that the relative concentration of dye in each film complemented outcomes from ultraviolet‐visible analysis and revealed that the translucent film contained a higher dye concentration. Scanning electron microscopy analysis of film morphology suggested that the observed difference was due to the higher porosity of the opaque film, which facilitated dye desorption during the rinsing step. Consequently, the translucent film was judged to be a better substrate for screening potential new hair dyes. Note de contenu : - EXPERIMENTAL : Chemicals and other materials - Bleaching keratin fibres - Attenatuated total reflectance-Fourier Transform-infrared spectroscopy analysis of keratin flms - Thermogravimetric analysis of dyed keratin flms - SEM analysis of keratin films - Dye desalinisation and analysis - Dyeing keratin films - UV-Vis analysis of dyed keratin films - TOF-SIMS analysis of dyed keratin films - RESULTS AND DISCUSSION : Molecular ocmposition of keratin films - Thermal stability of keratin films - Morphology of keratin fibres and films - Dye uptake on keratin films - TOF-SIMS studies of dyed keratin films DOI : 10.1111/cote.12408 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12408 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32828 [article]

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Classification of light fastness and weather fastness of orange pigments and studies in waterborne latex paints / Artur Palasz in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4673 (02/2022)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 212, N° 4673 (02/2022) . - p. 21-26 Titre : Classification of light fastness and weather fastness of orange pigments and studies in waterborne latex paints Type de document : texte imprimé Auteurs : Artur Palasz, Auteur Année de publication : 2022 Article en page(s) : p. 21-26 Langues : Anglais (eng) Catégories : Evaluation Latex Orange (couleur) Photostabilité Pigments Résistance aux conditions climatiques Revêtements en bâtiment Revêtements en phase aqueuse:Peinture en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : The author discusses methods of assessing pigments, in this case orange pigments, in water-based architectural paints as façade paints for exterior and interior applications. Pigments are an extremely important group of raw materials used in the production of architectural paints. Both in the form of dry pigments and pigment concentrates (colourants), they allow for obtaining coloured coatings, which not only decorate our interiors, fences and façades, but also act as safety indicators, eg in paints for marking traffic routes or warning symbols. From an operational and economic point of view, their durability is extremely important, and knowledge about their durability to weather conditions is needed to select them for various applications, ranging from exposure to solar radiation, to operation at high temperatures. Due to the susceptibility of pigments as chemical compounds to changes in their properties, which are usually manifested in architectural paints, they must be properly classified and characterised for their proper use in formulations. In the article, I focused on the classification of pigments that exist on the market and their resistance to light (lightfastness) and weather factors (weatherability), as well as on case studies of the exposure of three different organic orange pigments using various methods of exposure to artificial (laboratory) light sources and accelerated action of weather conditions. The article is dedicated to the methods of assessing pigments, in this case orange pigments, in water-based architectural paints as façade paints for external application, fade due to weather conditions and for interior paints fade due light exposure through window glass. This paper also exemplifies the resistance to such factors under simulated laboratory conditions, in the form of data that the paint industry needs to develop weatherability and Iightfastness stable latex paint coatings for both indoor and outdoor use. These data should usually be included in guide formulations and start point formulations, which significantly accelerate R&D work in paint production companies, and above all, make a decision on whether to accept a given raw material for testing. Note de contenu : - LIGHTFASTNESS TESTS OF PIGMENTS : Exposure methods according to ASTM D4303 - Assessment of colour changes and classification of pigments - MARKET REQUIREMENTS FOR PAINTS AND COATINGS : UV exposure - EXPERIMENTAL : Pigments for studies - Paints for studies - TESTING PROGRAMME - TEST RESULTS - DISCUSSION OF TEST RESULTS En ligne : https://drive.google.com/file/d/1ugJlgaQPeYJBq35jmlei36qMdNELdT3L/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36971 [article]

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Dyeing properties on polyurethane fibres of novel azo disperse dyes prepared from a four-component Ugi reaction / Huanhuan Li in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

[article]  inCOLORATION TECHNOLOGY > Vol. 136, N° 6 (12/2020) . - p. 485-491 Titre : Dyeing properties on polyurethane fibres of novel azo disperse dyes prepared from a four-component Ugi reaction Type de document : texte imprimé Auteurs : Huanhuan Li, Auteur ; Gaofeng Feng, Auteur ; Shuaijun Fang, Auteur ; HongFei Qian, Auteur Année de publication : 2020 Article en page(s) : p. 485-491 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Colorants azoïques Colorimétrie Isotherme d'adsorption Orange (couleur) Polyuréthanes Solidité de la couleur Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : A new group of azo disperse dyes prepared by the Ugi four-component reaction were used to dye polyurethane fibres. It was found that all the new dyes showed excellent fastness properties. One of the new dyes was selected to investigate the adsorption properties on polyurethane fibres, including the dyeing rate, adsorption isotherm, surface adsorption state, colour characteristics and colour fastness. The results were compared with those of CI Disperse Orange 3, which has the same parent structure as the new dye. The results indicated that the new dye has a lower dyeing rate and solubility but a higher affinity and adsorption capacity than the conventional dye due to its larger molecular weight and size. In addition, the aggregation of the new dye on the surface of polyurethane fibres occurred at higher concentrations whereas the conventional dyes aggregated at a lower concentration, resulting in lower colour fastness. This demonstrates that these new dyes derived from the Ugi four-component reaction are worth developing further and are of great application value for polyurethane fibres. Note de contenu : - EXPERIMENTAL : Materials - Dyeing procedure - Measurmeent of adsorption isotherms - Observation of the adsorbed state on the surface of the fibres - Colorimetric evaluation - Fastness test - RESULTS AND DISCUSSION : Dyeing rate - Adsorption isotherm - Colorimetric properties - Fastness properties - Table 1 : Colour parameters for dyeings with different concentrations of dye - Table 2 : Fastness testing of the dyes on the PU fibres DOI : https://doi.org/10.1111/cote.12495 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12495 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34702 [article]

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Flexible longitudinal and transversal displacement sensors based on a composite of CI Disperse Orange 25 and carbon nanotubes / Irfan Ullah in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

[article]  inCOLORATION TECHNOLOGY > Vol. 138, N° 1 (02/2022) . - p. 90-96 Titre : Flexible longitudinal and transversal displacement sensors based on a composite of CI Disperse Orange 25 and carbon nanotubes Type de document : texte imprimé Auteurs : Irfan Ullah, Auteur ; Khasan Sanginovich Karimov, Auteur ; Mohamed Adib Ibrahim, Auteur ; Noshin Fatima, Auteur Année de publication : 2022 Article en page(s) : p. 90-96 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Capteur de déplacement flexible Capteurs (technologie) Colles:Adhésifs Nanotubes Orange (couleur) Silicones Les silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki). Technologie médicale Index. décimale : 681.51 Electronique et informatique industrielle, capteur Résumé : This paper presents the proposal and characterisation of a flexible, shockproof, vibration-free, longitudinal and transversal compressive displacement sensor based on a composite of CI Disperse Orange 25 and carbon nanotubes created with an energy-free, drop-casting technique. The structural morphology of each layer is studied briefly through X-ray diffraction. Electric investigations of the sensors in the form of impedance were performed as a function of longitudinal and transversal compressive displacement at three different frequencies. The compressive displacements were measured from 0 to 250 µm at three fixed frequencies (ie, 1, 10 and 200 kHz). The impedance has an inverse relationship with longitudinal compressive displacement but a direct relationship with transversal compressive displacement. The frequency to impedance relationship is inverse with the sensitivity of the impedance as a function of longitudinal displacement. Because of their small size, light weight and simple fabrication technique and design, as well as their low cost and maintenance, these types of devices can be utilised across a wide range of medical applications, such as in rehabilitation centres, for machine status assessment during physiotherapy, and in robotic body parts, as well as for educational purposes in universities. Note de contenu : - Table 1 : Summary of the longitudinal and transverse compressive displacement sensor sensitivities DOI : https://doi.org/10.1111/cote.12574 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12574 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37502 [article]

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Highly exciting and orange / Patrick Frey in PLASTICS INSIGHTS, Vol. 113, N° 6 (2023)  

[article]  inPLASTICS INSIGHTS > Vol. 113, N° 6 (2023) . - p. 78-80 Titre : Highly exciting and orange : Color-stable high-voltage connectors for electric vehicles Type de document : texte imprimé Auteurs : Patrick Frey, Auteur ; Andreas Nixdorf, Auteur ; Tina Kolb, Auteur Année de publication : 2023 Article en page(s) : p. 78-80 Langues : Anglais (eng) Catégories : Anticorrosion Connecteurs électriques lasers Marquage (technologie) Orange (couleur) Polyamide 66 Polybutylène téréphtalate Polymères ignifuges Résistance au jaunissement Stabilisants (chimie) Véhicules électriques Index. décimale : 668.4 Plastiques, vinyles Résumé : The orange RAL 2003 color has established itself as a signal color for high-voltage components in electromobility. Vital for these components is the longevity of the color while at the same time maintaining other properties such as flame retardancy and hydrolysis resistance. Orange compounds based on PBT and PA are now available for high-voltage connectors. Laser marking also provides an essential characteristic to orange-colored components. Note de contenu : - Flame-retardant and resistant to heat aging - Suitable stabilizer prevents contact corrosion - Preventing yellowing in PA - Glass fibers impact color stability - Laser marking also for orange - Fig. 1 : In addition to PBT, BASF now also offers PA grades for high-voltage connectors.Table. BASF offers various materials in orange for high-voltage components - Fig. 2 : Elongation at break of PA66 Ultramid Exp. 3E3G6 DC OR after heat aging at 120 and 140 °C and PBT Ultradur B4331G6 HR OR at 150 °C. A heat stabilizer was added to the PA to achieve the corresponding values - Fig. 3 : Sample plates from PA66 Ultramid Exp. A3E3G6 DC OR under the influence of heat aging at different temperatures and storage times: The influence of temperature on the color tone is clearly visible - Fig. 4 : Appropriate additives can also be used to lasermark orange polyamides such as PA66 Ultramid Exp. A3U44G6 DC LS OR. The example shown was created with a laser at 1064 nm En ligne : https://drive.google.com/file/d/1HcsNTT_GtOFFUGVgUyaBv_xQtUP4P9ug/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40002 [article]

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Investigation into the reaction of reactive dyes with carboxylate salts and the application of carboxylate-modified reactive dyes to cotton / David M. Lewis in COLORATION TECHNOLOGY, Vol. 138, N° 1 (02/2022)  

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Mechanism and application of ozone fading: Oxidative decolorisation of disperse dyes and waste-dyed polyester fabrics / Jiangfei Lou in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

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Pigments part - XII (c) / Mukund Hulyalkar in PAINTINDIA, Vol. LXIII, N° 3 (03/2013)  

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Thermal management and intensive orange / Robert Schädel in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 5 (2022)  

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Thermodynamics of leather dyeing : III. The preparation of chrome-tanned hide powders and their interaction with C.I. Acid Orange 7 / A. T. Atto in JOURNAL OF THE SOCIETY OF LEATHER TRADES' CHEMISTS, Vol. 55, N° 3 (03/1971)

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Weather-fast colours / Larry G. Lane in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 196, N° 4502 (07/2006)

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