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Influence of added surfactant on particle flocculation in waterborne polymer–particle systems / L. Karlson in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 4 (12/2008)
[article]
Titre : Influence of added surfactant on particle flocculation in waterborne polymer–particle systems Type de document : texte imprimé Auteurs : L. Karlson, Auteur ; M. Olsson, Auteur ; G. Boström, Auteur ; L. Piculell, Auteur Année de publication : 2008 Article en page(s) : p. 447-454 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Dispersions et suspensions
Dynamique moléculaire
Polymères
Revêtements en phase aqueuse:Peinture en phase aqueuse
SurfactantsIndex. décimale : 667.6 Peintures Résumé : Polymer–particle interactions can cause particle flocculation and phase separation problems in waterborne coatings. The problems can be the result of interactions that are either too weak or too strong. It is known by empirical work that addition of surfactants can minimize these problems. In this study, the authors have investigated how different types of surfactants influence the polymer–particle interactions. Both hydrophobic and hydrophilic particles were included in the study, and nonionic, anionic, and cationic surfactants were used. A simple model is suggested that can be used to predict the surfactant concentration needed to stabilize the system. The model considers the cmc (critical micelle concentration) of the surfactant, the adsorption to the polymer, and the adsorption to the particles. DOI : 10.1007/s11998-008-9094-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9094-8.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3470
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 4 (12/2008) . - p. 447-454[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010911 - Périodique Bibliothèque principale Documentaires Disponible Influence of dispersing additives on the conductivity of carbon black pigment dispersion / Nina Hauptman in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 5 (10/2011)
[article]
Titre : Influence of dispersing additives on the conductivity of carbon black pigment dispersion Type de document : texte imprimé Auteurs : Nina Hauptman, Auteur ; Marta Klanjsek Gunde, Auteur ; Matjaž Kunaver, Auteur ; marija Bešter-Rogac, Auteur Année de publication : 2011 Article en page(s) : p. 553-561 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Conduction électrique
Dispersions et suspensions
Fourier, Spectroscopie infrarouge à transformée de
Noir de carboneIndex. décimale : 667.2 Colorants et pigments Résumé : The influence of dispersing additives on the electrical conductivity of carbon black pigments dispersed in an organic medium was studied. Two dispersing additives were examined in combination with two different carbon blacks, a conductive carbon black and a nonconductive one. These carbon blacks differ in the size of their aggregates and in the amounts of surface oxygen groups. Both of the additives form a monolayer when adsorbed on either of the pigment surfaces. FTIR studies showed that chemical bonding of one of the additives on the surfaces of both pigments had occurred. Conductivity decreases with increasing additive concentration, but in the case of the chemically bonded additive, the conductivity of the dispersion remained high even at higher additive loadings. This study helps in understanding the effects such additives have on the specific conductivity of composite materials that contain dispersed carbon black pigment particles. Note de contenu : EXPERIMENTAL : Materials - Size distribution of CB - Preparation of dispersions - Adsorption measurements - Conductivity measurements of suspensions - Infrared spectroscopy
RESULTS AND DISCUSSION : Size distribution of CB particles - Adsorption - Specific conductivity of dispersions - FTIR studies of the dispersant's interactions with the CB surfaceDOI : 10.1007/s11998-011-9330-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9330-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12231
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 5 (10/2011) . - p. 553-561[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13360 - Périodique Bibliothèque principale Documentaires Disponible Influence of retanning of the adsorption capacity of water on cattlehide collagen fibers / Keyong Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 11 (11/2009)
[article]
Titre : Influence of retanning of the adsorption capacity of water on cattlehide collagen fibers Type de document : texte imprimé Auteurs : Keyong Tang, Auteur ; Dominick J. Casadonte, Auteur ; Dennis C. Shelly, Auteur ; Jie Liu, Auteur ; Ming Yang, Auteur ; Xuejing Zheng, Auteur Année de publication : 2009 Article en page(s) : p. 367-374 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Adsorption
Collagène
Cuirs et peaux
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : There are an abundance of hydrophilic groups in the collagen fibers in leathers. Because the affinity between these hydrophilic groups and water molecules varies with changes in temperature and relative humidity, leathers will adsorb or de-adsorb water as these factors change; affecting strength, permeability, and thermal stability. Retanning is a key operation in leather making with the purpose of retanning is to obtain leathers with some special characteristics. The water content in leathers, often 15-20 wt%, is an amount that cannot be neglected. However, few reports are found on the interactions between collagen and water, particularly the influence of retanning on the interaction between water and collagen fibers. The state that water molecules exist in collagen fibers, the mechanism for collagen fibers to adsorb water, the de-adsorption kinetics for water molecules to escape from collagen fibers, and the influence of retanning on the adsorption of water on collagen fibers need to be studied to improve the leathermaking technology for controlling the structure and behaviors of leathers. In this study, after being chrome tanned, collagen fibers were retanned with chrome, glutaraldehyde, TGR retanning agent (proprietary acrylic based), and wattle extract, respectively, to obtain different retanned samples. The water adsorption isotherms of the samples were determined by using a gravimetric method, by which the influence of retanning on the equilibrium water adsorption capacity and the influencing mechanism were evaluated. Different retanned samples varied in water adsorption characterization and equilibrium adsorption capacity. The TGR retanning increased the equilibrium adsorption capacity, while glutaraldehyde retanning decreased it; likely related to differences in retanning mechanisms. For different relative humidity environments, leathers should be retanned with different retanning agents to get an optimum property. Based on the adsorption characterization and the equilibrium adsorption capacity for the samples, different mathematics models were used to describe the adsorption process and the adsorption mechanism. Six models were chosen to fit the experimental data, and it was found that the Bradley model was the best to describe the adsorption. En ligne : https://drive.google.com/file/d/1Rv1WvrffcvoLu3ITj9Od-y-F5wT4O2l2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6385
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CIV, N° 11 (11/2009) . - p. 367-374[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 011708 - Périodique Bibliothèque principale Documentaires Disponible Investigating the cell rotary conditioning mechanism using dynamic mechanical thermal analysis / Karl B. Flower in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 10 (10/2015)
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Titre : Investigating the cell rotary conditioning mechanism using dynamic mechanical thermal analysis Type de document : texte imprimé Auteurs : Karl B. Flower, Auteur ; Adriano Peruzzi, Auteur ; William R. Wise, Auteur ; Anthony D. Covington, Auteur Année de publication : 2015 Article en page(s) : p. 317-325 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Absorption
Adsorption
Analyse thermomécanique dynamique
Calorimétrie
Cuirs et peaux -- Séchage
Désorption
Gravimétrie (chimie analytique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Jeyapalina et al. established that dynamic mechanical thermal analysis (DMTA) can be used to gauge the progression of leather drying. This work has now been advanced in order to understand the mechanism surrounding sorption/desorption of moisture during cell conditioning, e.g., cell rotary conditioning (CRC). This paper will demonstrate how the use of DMTA could be used to monitor changes in leather stiffness. A gravimetric moisture analysis was performed on identical leather samples to gauge the progression of desorption. The change in storage modulus (E’) was coupled to the moisture content (leather moisture and atmospheric relative humidity) to obtain a better understanding of the physical properties (specifically stiffness) of leather during a drying process. The research presented illustrates how DMTA can indicate leather fiber response to changes in atmospheric humidity and facilitate real-time adaptation of drying conditions during leather dehydration. The use of a cell conditioning system allows a tanner to control the flexibility of the material through the tension applied and the drying conditions. DMTA shows that the favorable conditions inside a CRC unit result in detectable changes to the leather fiber, similar to findings by Abrahamson and Williams-Wynn. Using this technique a researcher can dry chromium-containing and chromium-free leathers in a manner that is highly customizable to produce desired physical properties. Difficulties experienced in chromium-free leathers can also be investigated in detail using this technique. Note de contenu : - INTRODUCTION : Drying literature - Drying methods - Sorption/desorption of water - Effects of heat and moisture on leather - Dynamic mechanical thermal analysis
- EXPERIMENTAL : Leather raw materials - Conditioning - Dynamic mechanical thermal analysis - Differential scanning calorimetry
- RESULTS AND DISCUSSION : Leather raw materials (gravimetric analysis) - Static thermal studies - Dynamic thermal studiesEn ligne : https://drive.google.com/file/d/1gSTYiwGRroeFzPGRHmK24blXV07LBXW7/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24742
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CX, N° 10 (10/2015) . - p. 317-325[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17500 - Périodique Bibliothèque principale Documentaires Disponible
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Titre : Ion exchange fibers Type de document : texte imprimé Auteurs : Yusuke Hirai, Auteur Année de publication : 2014 Article en page(s) : p. 208-210 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption
Atmosphère -- Pollution -- Lutte contre
Eau -- Epuration
Fibres textiles synthétiques
Ions, Echange d'
Métaux lourds
Pollution -- Lutte contreIndex. décimale : 677.4 Textiles artificiels Résumé : In recent years, many countries have been establishing effluent standards because of the escalating water pollution. For this reason the importance of water treatment is rapidly increasing. At the same time, air pollution is also a big problem. Ion exchange is one of the environmentally-conscious approaches towards these problems, which can apply to the metal removal, metal adsorption, and air purification. En ligne : https://drive.google.com/file/d/1cCSOgnLq8-1HVuJZVchpmiNgQVXKl61r/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22038
in CHEMICAL FIBERS INTERNATIONAL > Vol. 63, N° 4 (12/2013) . - p. 208-210[article]Réservation
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