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Study on interaction mechanism between neutral salts and collagen by combining experiments with molecular dynamics simulation / Min Gu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 7 (07/2023)
[article]
Titre : Study on interaction mechanism between neutral salts and collagen by combining experiments with molecular dynamics simulation Type de document : texte imprimé Auteurs : Min Gu, Auteur ; Xiaoxia Zhang, Auteur ; Yuanzhi Zhang, Auteur ; Songcheng Xu, Auteur ; Guoying Li, Auteur Année de publication : 2023 Article en page(s) : p. 271-281 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de calcium
Chlorure de sodiumLe chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin.
On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na).
Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène.
Collagène
Collagène -- Analyse
Dynamique moléculaire
Lumière -- Diffusion
Microscopie à force atomique
Potentiel zeta
Simulation, Méthode de
Solutions (chimie)
Spectroscopie de fluorescence
Sulfate de sodiumLe sulfate de sodium est un composé chimique courant formé d'un ion sulfate et de deux ions sodium. Lorsqu'il est anhydre, il prend l'apparence d'un solide cristallin blanc de formule chimique Na2SO4. La forme déca-hydratée, Na2SO4·10H2O, est connue sous le nom de sel de Glauber ou mirabilite. Parmi un grand nombre d'usages différents, les principales utilisations du sulfate de sodium concernent la fabrication des détergents et dans le procédé de Kraft de traitement de la pâte à papier. La moitié environ de la production mondiale provient de l'extraction de la forme naturelle décahydratée, et l'autre moitié de productions secondaires dans des procédés de l'industrie chimique.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The effect of salt on the collagen of hide/skin is of great significance in leather-making. However, the interaction between neutral salts and collagen has not been clear, since the microscopic interaction is hard to be observed directly from the macro level of hide/skin collagen. In this study, the collagen solutions in the typical neutral salts (NaCl, CaCl2, and Na2SO4) systems were used to explore the interaction mechanism between neutral salts and collagen via combining experiments with molecular dynamics (MD) simulation. The results of fluorescence measurements of pyrene, dynamic light scattering, atomic force microscopy, and isoelectric point suggested that the variation of the interaction between different neutral salts and collagen was accompanied with the changes in physicochemical properties of collagen. MD simulation further revealed more detailed information on the interaction mechanism between neutral salts and collagen at the molecular level. The computational results of non-bond energy of the collagen-salt model boxes indicated that the electrostatic interactions of different salts with collagen molecules had the order of CaCl2> Na2SO4> NaCl. The analyses of the visualized conformation and the radial distribution functions showed that CaCl2 with Ca2+ as contributing ion tended to form intramolecular salt bridges with collagen, while Na2SO4 with SO42-as contributing ion more likely formed salt bridges between collagen molecules in the shape of agglomerates. In contrast, NaCl with Cl-as contributing ion was scattered around the collagen models, and its effect on collagen was much smaller. The study elaborated the interaction mechanism of typical neutral salts and collagen to be helpful for further understanding and improving the use of neutral salts in many steps involved in leather production. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of collagen solutions with salts - Measurments of pyrene fluorescence spectra - Measurements of dynamic light scattering - Atomic force microscope measurements - Measurements of zeta potential - Construction of collagen model and simulation boxes - Molecular dynamics simulation
- RESULTS AND DISCUSSION : Pyrene fluorescence spectra analysis - Dynamic Light Scattering (DLS) analysis - Atomic Force macroscopic (AFM) images - Zeta potential analysis - Non-bond energy analysis in different salt systems - Interactions between collagen and salts by conformation analysis - Radial distribution function analysis
- Table 1 : The I1/I3 Ratio values of pyrene in 0.5 mg/mL collagen solutions containing 0–200 mM salts (NaCl, CaCl2 and Na2SO4) and the CAC values of collagen in 0 mM and 80 mM salts
- Table 2 : Non-bond energies (kcal/mol) of collagen model in [pure col] system and different salt systemsDOI : https://doi.org/10.34314/jalca.v118i7.7855 En ligne : https://drive.google.com/file/d/1F9oD_1lM1fCPfmu-6WzHTCWXnEWjEzmt/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39661
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 7 (07/2023) . - p. 271-281[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24133 - Périodique Bibliothèque principale Documentaires Disponible The best for red and yellow- A new additive technology for waterborne iron oxide pigment concentrates / Frank Kleinsteinberg in PAINTINDIA, Vol. LXX, N° 9 (09/2020)
[article]
Titre : The best for red and yellow- A new additive technology for waterborne iron oxide pigment concentrates Type de document : texte imprimé Auteurs : Frank Kleinsteinberg, Auteur ; Markus Vogel, Auteur Année de publication : 2020 Article en page(s) : p. 96-100 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Dispersions et suspensions
Formulation (Génie chimique)
Granulométrie
Jaune
Lumière -- Diffusion
Opacifiants
Oxyde de fer
Pigments inorganiques
Potentiel zeta
Revêtements décoratifs:Peinture décorative
Rouge (couleur)
Taille des particules
ViscositéIndex. décimale : 667.9 Revêtements et enduits Résumé : In decorative coatings, the use of pigment concentrates is a modern and flexible way to produce colored 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, color 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 stabilize the pigments over a long period of time without any change in viscosity and it has to develop maximum color strength to avoid any waste of expensive pigments. Note de contenu : - Pigment concentrate technology
- Pigment dispersion process
- Electrostatic stabilization - Zeta potential
- Steric stabilization
- Discussion of the results
- Particle size and hiding power
- Viscosity and stability
- Zetal potential
- Fig. 1 : IHS — Chemical Economics Handbook — Inorganic color
pigments consumption of inorganic color pigments in 2014
- Fig. 2 : Relationship :Light scattering - particle size diameter
- Fig. 3 : Mechanisms of pigment stabilization
- Fig. 4 : Mode of electrostatic stabilization
- Fig. 5 : Interaction between pigment particles with and without additive
- Fig. 6 :Initial viscosities of the pigment concentrates
- Fig. 7 : Zeta potential - Iron oxide yellow zeta potential - PY 42
- Fig. 8 : Zeta potential - iron oxide red zeta potential - PR 101
- Fig. 9 : Stabilization of PY 42 requirements for a good stabilization PY 42
- Fig. 10 : Stabilization of PR 101
- Table 1 : Tested formulations
- Table 2 : Particle size and hiding powerEn ligne : https://drive.google.com/file/d/13OtDZPFJ2wwTzF9XSg8JoyUuUmU733V0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34663
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Code-barres Cote Support Localisation Section Disponibilité 22359 - Périodique Bibliothèque principale Documentaires Disponible The critical role of particle size distribution in inkjet ink performance / Anne Virden in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 207, N° 4631 (05/2017)
[article]
Titre : The critical role of particle size distribution in inkjet ink performance Type de document : texte imprimé Auteurs : Anne Virden, Auteur Année de publication : 2017 Article en page(s) : p. 20-24 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Diffraction
Dispersions et suspensions
Encre jet d'encre
lasers
Lumière -- Diffusion
Pigments
Taille des particulesIndex. décimale : 667.4 Encres Résumé : How pigment particle size influences ink performance, the finish achieved and the techniques used are shown in this case study data carried out by Malvern Instruments'.
In this article, we look at how the size of pigment particles influences ink performance and the finish achieved and at the techniques used to measure particle size, focusing on the complementary application of laser diffraction and dynamic light scattering. Case study data illustrates the value of the resulting measurements.Note de contenu : - Understanding the links between particle size between particle size and ink performance
- Making inkjet inks
- Introducing laser diffraction and dynamic light scattering : Laser diffraction - Dynamic light scattering (DLS)
- Case study 1 : wet mill monitoring
- Case study 2 : detecting oversized particles
- Case study 3 : pigment dispersionEn ligne : https://drive.google.com/file/d/1nhSgX_EBkVus7EyiOpDLIhGmSrVsM3P4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28637
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Code-barres Cote Support Localisation Section Disponibilité 18924 - Périodique Bibliothèque principale Documentaires Disponible The influence of chemical reaction conditions upon poly(styrene-methyl methacrylate-crylic acid) synthesis : Variations in nanoparticle size, colour and deposition methods / Rui D. V. Fernandes in COLORATION TECHNOLOGY, Vol. 136, N° 2 (04/2020)
[article]
Titre : The influence of chemical reaction conditions upon poly(styrene-methyl methacrylate-crylic acid) synthesis : Variations in nanoparticle size, colour and deposition methods Type de document : texte imprimé Auteurs : Rui D. V. Fernandes, Auteur ; Pedro Gomes, Auteur ; Andrea Zille, Auteur ; Antonio Pedro Souto, Auteur Année de publication : 2020 Article en page(s) : p. 101-109 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie textile
Copolymère styrène-méthacrylate de méthyle-acide crylique
Copolymères -- Synthèse
Latex
Lumière -- Diffusion
Polyamide 66
Polymérisation en émulsion
Potentiel zeta
Réactions chimiques
Textiles et tissusIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Monodisperse latex nanospheres of poly(styrene-methyl methacrylate-acrylic acid) with different sizes were synthetised by soap-free emulsion copolymerisation and applied onto polyamide 6,6 fabrics by two methods, ie, gravitational sedimentation and dip-drawing. Different-sized nanospheres were synthetised by varying temperature and stirring velocity as reaction parameters. Scanning electron microscopy and scanning transmission electron microscopy were used to evaluate nanosphere sizes and deposition structures. The results showed two different nanosphere structural arrangements on the fabric surface, a hexagonal packed centre structure in the even surfaces and a square arrangement in the out-of-plane surfaces. Different colours were observed according to particle size, namely, violet (ca . 170 nm), blue (ca . 190 nm), green (ca . 210 nm), yellow (ca . 230 nm) and red (ca . 250 nm). An iridescence effect was also observed, displaying different colours at different observation angles. By controlling the size of the nanospheres it was possible to obtain different, brilliant and iridescent colours. Using different nanosphere sizes it was possible to obtain different interplanar distances and to control the light scattering in the crystalline lattice planes, obtaining Bragg diffraction patterns. Note de contenu : - Materials
- Preparation of monodisperse P(St-MMA-AA) composite nanospheres
- Fourier Transform-infrared spectroscopy with attenuated total reflectance
- Dynamic light scattering and zeta potential measurements
- Deposition of PCs by the dip-drawing method
- Scanning electron microscopy and scanning transmission microscopy
- Optical microscopy
- Diffuse reflectance spectroscopy
- Glossmeter analysis
- PhotographsDOI : https://doi.org/10.1111/cote.12452 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34229
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Code-barres Cote Support Localisation Section Disponibilité 21751 - Périodique Bibliothèque principale Documentaires Disponible The use of Monte Carlo simulation to evaluate the optical properties of polyester fabric treated with titanium dioxide nanopigments / Laleh Asadi in COLORATION TECHNOLOGY, Vol. 139, N° 1 (02/2023)
[article]
Titre : The use of Monte Carlo simulation to evaluate the optical properties of polyester fabric treated with titanium dioxide nanopigments Type de document : texte imprimé Auteurs : Laleh Asadi, Auteur ; Ali Shams Nateri, Auteur Année de publication : 2023 Article en page(s) : p. 28-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Coefficient de diffusionUn coefficient de diffusion est une grandeur caractéristique du phénomène de diffusion de la matière. Le coefficient de diffusion mesure le rapport entre le flux molaire dû à la diffusion moléculaire, et le gradient de concentration de l'espèce chimique considérée (ou, plus généralement, de la variable d'effort entraînant cette diffusion), comme formulé par la loi de Fick.
Dioxyde de titane
Enduction textile
Fibres textiles -- Propriétés optiques
Lumière -- Diffusion
Mie, Diffusion de
Monte-Carlo, Méthode de
Pigments
Pigments inorganiques
Spectroscopie de réflectance
Textiles et tissus -- Propriétés optiquesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : The current study utilises Monte Carlo simulation and Mie scattering theory to estimate the reflectance spectra of fabric coated with titanium dioxide nanopigments of various diameters and concentrations. Image processing was carried out and experimental data were gathered to evaluate the performance of Monte Carlo simulation. The distribution and location of the nanopigments on the surface of fabric were determined using the Monte Carlo method. Reflection of the fabric was calculated based on Monte Carlo simulation with the partitive mixing method and Mie theory. According to the experimental and simulation results, the reflectance of coated samples was increased by increasing the concentration and number of titanium dioxide nanoparticles. There was a good match between the results obtained by Monte Carlo simulation and the experimental results. For coated samples (dTiO2: 500 nm), the root mean square error between measured and predicted reflectance by the Monte Carlo and partitive mixing method and by Monte Carlo and Mie theory was 0.022 and 0.0078, respectively. The results indicate that the performance of the Monte Carlo and Mie method was better than that of the Monte Carlo and partitive mixing method. According to t-test analysis, there was no statistically significant difference between the experimental data and Monte Carlo simulation. Note de contenu : - EXPERIMENTAL : Materials - Polyester fabric coating - Characterisation
- MODEL DESCRIPTION : MC and the partitive mixing method - MC and the Mie method
- Table 1 : For polyester fabric, the percentages of uncoated surface and surface coated with titanium dioxide (TiO2) based on the image processing system
- Table 2 : CIELab and colour difference (∆E) values for the uncoated (raw fabric) sample and samples coated with titanium dioxide (TiO2)
- Table 3 : Scattering coefficient values for titanium dioxide nanopigments with average diameters of 30, 50, 150, 250 and 500 nm
- Table 4 : Forward and backward light scattering of titanium dioxide (TiO2) nanoparticles based on Mie theory
- Table 5 : Forward and backward light scattering of titanium dioxide (TiO2) nanoparticles based on image processing
- Table 6 : Percentages of empty and occupied particles using the Monte Carlo method for different hypothetical numbers of titanium dioxide (TiO2) nanoparticles
- Table 7 : Estimated percentages of empty and occupied particles using the Monte Carlo method for actual numbers of titanium dioxide (TiO2) nanoparticles
- Table 8 : Area occupied on the fabric surface by single, double and multiple titanium dioxide (TiO2) nanopigments
- Table 9 : L*, a*, b* and ∆E values for samples with different numbers of titanium dioxide (TiO2) nanopigments
- Table 10 : CIELab and ∆E values and the root mean square error (RMSE) for reflectance predictions using the Monte Carlo and partitive mixing method
- Table 11 : CIELab and ∆E values and the root mean square error (RMSE) for reflectance predictions using the Monte Carlo and Mie method
- Table 12 : T-stat and P values for the experimental and Monte Carlo simulation resultsDOI : https://doi.org/10.1111/cote.12632 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12632 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39203
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Code-barres Cote Support Localisation Section Disponibilité 24084 - Périodique Bibliothèque principale Documentaires Disponible Theoretical evaluation of the impact of finite intervals in the measurement of the bidirectional reflectance distribution function / Alejandro Ferrero in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 1 (01/2020)
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PermalinkTiO2 scattering optimization and not-in-kind opacity alternatives / Michael P. Diebold in COATINGS TECH, Vol. 10, N° 2 (02/2013)
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PermalinkViscosity properties of collagen solutions : influence of pH, salt type and salt concentration / Kai Lei in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 102, N° 3 (05-06/2018)
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