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Structural colours inspired by nature / Hendrik Hölscher in EUROPEAN COATINGS JOURNAL (ECJ), N° 11 (11/2018)
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Titre : Structural colours inspired by nature : Nanostructures found in plants and insects have useful commercial applications Type de document : texte imprimé Auteurs : Hendrik Hölscher, Auteur Année de publication : 2018 Article en page(s) : p. 36-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie biomimétique
Couleur
Couleur -- Analyse
Nanostructures
Polyméthacrylate de méthyleLe poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec.
vision des couleursIndex. décimale : 667.9 Revêtements et enduits Résumé : Some plants and animals display vibrant colours that are produced by nanostructures not pigments. Recent advances in nano-analytics and fabrication reveal the physics behind these structural colours. Structural colours have several advantages over conventional pigments as they are very efficient in terms of brightness and material usage, and do not fade. These natural structures therefore make ideal prototypes for new types of colourfull materials and coatings. Note de contenu : - Photonic crystal structures for consistent colour
- Commercial application not yet cost effective
- Colour shifts with shape memory opals
- Near-perfect whiteness inspired by nature
- Foamed PMMA scatters light of all wavelengths
- Fig. 1 : Peacock feathers contain voids [inset] which act as photonic crystals, producing the iridescent colours
- Fig. 2 : 3D cinema glasses reveal that the green rose chafer beetle only reflects left circularised light. It appears green through the left lens and black through the right
- Fig. 3 : a) The chitin nanostructure in this Morpho rhetenor produces its bright blue colouring. The smaller artificiel butterfly is another example of this type of nanostructure. b) High-resolution electron microscopy reveals this Christmas-tree like structure with its "branches" being only 50-70 nm thick. c) 80-year-old pendant demonstrates the longevity of structural colour
- Fig. 4 : Fabrication process of shape memory polymers opals (SMPOs)
- Fig. 5 : Demonstration of the colour change of a SMPO from orange/brown to green by mechanical stretching
- Fig. 6 : a) The white beetle Cyphochilus insulanus is well-known for its white appearance caused by its nearly perfectly scattering white scales ; b) The inner structure of the scales contains a random structure of nanoscale fibrils
- Fig. 7 : A process to fabricate a white PMMA coating by infiltrating supercritical CO2En ligne : https://drive.google.com/file/d/1PA_1jnSH6glqrtj8C_BlbOcbCpWjoGzt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31220
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 11 (11/2018) . - p. 36-41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20333 - Périodique Bibliothèque principale Documentaires Disponible Studies of the application of biocolorant for leather dyeing using Monascus Purpureus / A. Tamil Selvi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 4 (04/2018)
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Titre : Studies of the application of biocolorant for leather dyeing using Monascus Purpureus Type de document : texte imprimé Auteurs : A. Tamil Selvi, Auteur ; Gladstone Christopher Jayakumar, Auteur ; N. Usha Rani, Auteur ; Arjunan Yasothai, Auteur Année de publication : 2018 Article en page(s) : p. 105-113 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chimie -- Essais et réactifs
Colorants végétaux
Cuirs et peaux -- Teinture
Essais dynamiques
Extraction (chimie)
Fermentation
Frottements (mécanique)
pH
Photostabilité
Résistance à l'abrasion
Rouge (couleur)
Température
vision des couleursIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : World-wide requirement for colorants from natural origins have been rapidly increasing in the leather sector due to environmental effluent concerns. Biocolorant obtained from Monascus purpureus, which yields red colored extract, has been studied for the dyeing process of leather. The effect of varying conditions like pH, concentration, time and temperature on the levelness of the dyeing, shade brightness, color intensity and exhaustion of the dye have been studied herein, and the conditions optimized. The change in color shade obtained has been quantified by reflectance measurements and compared with the visual assessment data. The bulk properties viz., softness and grain smoothness have been found to be marginally improved, versus control, in biocolorant treated leathers. There is no significant change in strength properties by the use of these natural colorants in the post tanning process. Note de contenu : - EXPERIMENTAL : Reagents and chemical - Microorganism - Substrate and solid-state fermentation - Extraction of biocolorant - experimental trials - Effect of concentration (Trial 1) - Effect of pH (Trial 2) - Effect of temperature (Trial 3) - Effect of time (Trial 4) - Control process - Comparison of experimental and control trials - Analysis of dye exhaustion in the process liquor - Determination of color difference - Visual color assessment - Determination of fastness to light - Determination of fastness to wet and dry rub - Physical testing analysis - Assessment of bulk properties
- RESULTS AND DISCUSSION : Biocolorant production - Natural colorant applied for dye exhaustion : influence of process parameters - Effect of concentration - Effect of pH - Effect of temperature - Effect of time - Effect of surface color at varied condition of biocolorant treatment - Optimized condition of biocolorant treatment Visual assessment of leathers - Light and rub fastness characteristics of leathers - Evaluation of strength characteristics - Assessment of bulk propertiesEn ligne : https://drive.google.com/file/d/1YA5SIZB5vrTUmFlGbGwcF0-7MSrBXeTF/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30339
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 4 (04/2018) . - p. 105-113[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19772 - Périodique Bibliothèque principale Documentaires Disponible The effect of lighting changes on simultaneous colour contrast : a new aspect of colour rendition / Alessandro Rizzi in COLORATION TECHNOLOGY, Vol. 134, N° 3 (06/2018)
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Titre : The effect of lighting changes on simultaneous colour contrast : a new aspect of colour rendition Type de document : texte imprimé Auteurs : Alessandro Rizzi, Auteur ; Cristian Bonanomi, Auteur ; Laura Blaso, Auteur ; Ornella Li Rosi, Auteur ; Simonetta Fumagalli, Auteur Année de publication : 2018 Article en page(s) : p. 214-221 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Eclairage
vision des couleursIndex. décimale : 535.6 Couleur Résumé : Among the many metrics used to compute the colour rendition of a light source which have been investigated in recent years, most consider only the spectral power distribution of the light source being tested. To highlight aspects not usually considered in the development of colour rendition metrics, and to propose future directions for alternative approaches consistent with human visual perception, an experiment was conducted to examine colour appearance variations on certain spatial visual content configurations, in other words the effects of illusions under different light sources. Results indicate that stronger simultaneous contrast configurations have a more unpredictable variation in appearance. Therefore, it is proposed that colour spatial distribution should be considered for the future generation of rendering metrics. Note de contenu : - INTRODUCTION : Measuring colour rendering
- EXPERIMENTAL : Materials - Method - ParticipantsDOI : 10.1111/cote.12336 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12336 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30645
in COLORATION TECHNOLOGY > Vol. 134, N° 3 (06/2018) . - p. 214-221[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 19954 - Périodique Bibliothèque principale Documentaires Disponible The impact of viewing conditions on observer variability for cross-media colour reproduction / Yoon Ji Cho in COLORATION TECHNOLOGY, Vol. 135, N° 3 (06/2019)
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Titre : The impact of viewing conditions on observer variability for cross-media colour reproduction Type de document : texte imprimé Auteurs : Yoon Ji Cho, Auteur ; Guihua Cui, Auteur ; Ronnier Luo, Auteur ; Kwanghoon Sohn, Auteur Année de publication : 2019 Article en page(s) : p. 234-243 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
Métamérisme
vision des couleursIndex. décimale : 667.3 Teinture et impression des tissus Résumé : This study investigates observer metamerism in cross-media colour reproduction (CMCR) between monitor and physical colours. An LCD display was placed inside a viewing cabinet. The cabinet had a mid-grey interior. Observers were asked to match a colour displayed on the monitor to a printed colour patch, which was also inside the viewing cabinet in two configurations, one consisting of two samples separated by a hairline gap (Configuration 1), and the other consisting of two samples separated by a large gap (Configuration 2). Eleven observers were asked to first match the background colour and then 10 test colours for each configuration, and this was repeated five times. The observers' variability results showed little difference between inter- and intra-variability, and between the two configurations. Comparing the observers' results with the CIE 1964 standard colorimetric observer, Configuration 1 and Configuration 2 each showed similar agreement. In both configurations, the results of observer variability were smaller than those obtained by Oicherman et al. in 2008. In addition, each configuration's results showed better agreement with the CIE standard colorimetric observer than Oicherman et al.'s results. This implies that both configurations, one with two samples having a hairline gap and with two samples separated by a large gap in a viewing cabinet, could be recommended for future CMCR systems. However, if choosing between the two, then Configuration 2 is recommended rather than Configuration 1. Note de contenu : - EXPERIMENTAL : Viewing cabinet - Monitor - Test stimuli - Experimental set-up
- RESULTS AND DISCUSSION : Comparing with different configurations - Agreement with the CIE 1964 standard colorimetric observer - Comparing Oicherman et al.'s result to this study's resultsDOI : 10.1111/cote.12395 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12395 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32615
in COLORATION TECHNOLOGY > Vol. 135, N° 3 (06/2019) . - p. 234-243[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20951 - Périodique Bibliothèque principale Documentaires Disponible The light, colour and interior coating and their alliance influencing on human well-being / Mithu Bhowmik in PAINTINDIA, Vol. LXXI, N° 1 (01/2021)
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Titre : The light, colour and interior coating and their alliance influencing on human well-being Type de document : texte imprimé Auteurs : Mithu Bhowmik, Auteur ; Mitra Avishek, Auteur Année de publication : 2021 Article en page(s) : p. 58-90 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bien-être
Couleur
Eclairage
Lumière artificielle
Revêtement de surface
Revêtements intérieurs
vision des couleursIndex. décimale : 535.6 Couleur Résumé : In our modem society, we spend much of our time in indoor atmosphere where we are surrounded by coated surfaces. Due to their inherent nature these surfaces are not able to reflect a spectrum of Electromagnetic Energies which are vital for healthy living. Such deficiencies leads to several health issues like sick building syndrome (SBS), health disorder like migraine, dizziness, chest pain, irritation to eyes, throat and nose, vomiting, joint pain, acidity and chronic lung disease. From many research studies it can be emphasised that individuals at work in indoor environment suffer from depression, poor task performance and unhealthy relationship with other people around. Apart from other environmental factors light and colour are two important constituents which have profound effect on human health and well-being. For a paint formulator this impact of colour and light scattering ability of the coated surface on human health has become a critical consideration while formulating a coating. This paper reviews the impact of natural Electromagnetic Energies (EME) on human health and well-being and the impact of some popular shades on human behaviour. We conclude, for indoor living, the interaction of available lighting conditions and inherent nature of coatings used on the surfaces has profound impact on human well-being as it governs the available spectrum of energies. An inter-disciplinary approach in partnership with 'Lighting' industries is required to device solutions essential for human well-being. Note de contenu : - Electromagnetic spectrum
- Interaction of light with human body
- The role of light in balancing circadian rhythms in human beings
- Dynamic lighting technology for maintaining bio-dock
- EMR and blood pressure and serum cholesterol levels
- Influence of EME on sexuality & depression
- The prevention of pathogens
- What is colour ?
- Interaction of colour energies with human body
- Where we see the colours ?
- Emotion and environment assessment
- Performance or non-performance
- Physiology assessment
- Actual or/and made up scenario and context
- Colour circle and psychology domain
- Côlour and light in architecture and its effects on spirit of space users
- What is visual comfort ?
- The influence of colour : Three functions of colour - Study 1 : Colour of interiors and productivity and mood - Subject for the experiment - Materials - Procedure - Study 2 : Occupants' performance mood, and preference in a red, white, or green office - Results - Study 3 : Effects of nine monochromatic office interior colours on clerical task and worker mood - Subjects - Procedure
- Choromotherapy - healing with colors
- Hypothesis of Chromotherapy
- How light and coating systems can enrich our quality of living
- Table 1 : Review of colour research methodology
- Fig. 1 : Spectrum of electromagnetic radiation
- Fig. 2 : Electromagnetic wave
- Fig. 3 : The effect of light on central nervous system (Scientific American, 1975, vol. 233, No. 1)
- Fig. 4 : The stimulatory and regulatory effect of light on human body (Hollwich, 1948)
- Fig. 5 : "The Influence of Ocular Light Perception on Metabolism in Man and in Animals," Dr Fritz Hollwich, 1979
- Fig. 6 : Non-image forming effect of light on human health (backgrounds of light and health and description of Healwell system
- Fig. 7 : Some typical circadian rhythm in human beings (DJ Dijk et. ah, 1997
- Fig. 8 : Field study with regular patient room and healwell patient room
- Fig. 9 : Healwell in patient satisfaction, medical staff satisfaction, longer sleeping time and faster falling asleep
- Fig. 10 : The spectral difference between the sunlight found in the natural outdoor environment compared to cool white fluorescent lamps that were developed to optimize light quantity and not quality (Biological impact fo sun light on health and infection control by Harry Braun)
- Fig. 11 : Colour psychology domain (Babakhani et al. ; 2017)
- Fig. 12 : Carpet and g lass colourful component in interior architecture design (Babakhaniet a1.; 2017)
- Fig. 13 : Nine monochromatic colour (Kwallek et. al., 1996)
- Fig. 14 : The Munsell colour notation
- Fig. 15 : Human Body conglomeration of colorsEn ligne : https://drive.google.com/file/d/1ecRTeuN1tW-Jjsjv1M1mWuRR4uUy3ZIY/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35226
in PAINTINDIA > Vol. LXXI, N° 1 (01/2021) . - p. 58-90[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22557 - Périodique Bibliothèque principale Documentaires Disponible The relationship between colour harmony and colour emotions-using two-colour combinations applied on 3D colour configuration / Wen-Yuan Lee in COLORATION TECHNOLOGY, Vol. 138, N° 4 (08/2022)
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PermalinkPermalinkUse of a predictive colour model for managing the colour appearance of two-colour woven fabrics / Krste Dimitrovski in COLORATION TECHNOLOGY, Vol. 136, N° 3 (06/2020)
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PermalinkPermalinkWhy accurate colour matching needs to control for gloss / Jason Loehr in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4655 (10/2019)
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