Application of nanostructured titanium dioxide pigments in paper coating: a comparison between prepared and commercially available ones / Fatma A. Morsy in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 2 (03/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 2 (03/2016) . - p. 307-316 Titre : Application of nanostructured titanium dioxide pigments in paper coating: a comparison between prepared and commercially available ones Type de document : texte imprimé Auteurs : Fatma A. Morsy, Auteur ; Samya El-Sherbiny, Auteur ; Marwa Samir, Auteur ; Osama A. Fouad, Auteur Année de publication : 2016 Article en page(s) : p. 307-316 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anatase L’anatase est une espèce minérale formée de dioxyde de titane de formule TiO2 avec des traces de fer, d'antimoine, de vanadium et de niobium. Dioxyde de titane Nanoparticules Papier -- Propriétés mécaniques Papier et carton couché Pigments -- Propriétés optiques Pigments inorganiques Rutile Le rutile est une espèce minérale composée de dioxyde de titane de formule TiO2 avec des traces de fer (près de 10 % parfois), tantale, niobium, chrome, vanadium et étain. Il est trimorphe avec la brookite et l'anatase. Il est la forme la plus stable de dioxyde de titane et est produit à haute température, la brookite se formant à des températures plus basses et l'anatase formée à des températures encore plus basses. Index. décimale : 667.9 Revêtements et enduits Résumé : Nano-TiO2 pigments in pure crystallographic anatase and rutile phases have been successfully prepared by hydrothermal at 120°C and hydrolysis methods, respectively. The laboratory-prepared pigments were characterized parallel to two commercial pigments of the same crystal structure. All pigments were applied in paper coating mixtures, and their influence on coated paper properties was systematically investigated. X-ray diffraction investigation showed that the laboratory-prepared pigments using the hydrothermal method at 120°C were pure anatase, whereas hydrolysis method produced pure rutile phase pigment. The application of the prepared nanopigments and the corresponding commercial TiO2 phases in paper coating revealed that clay/rutile nano-TiO2 pigments in paper coating mixture decreased coated paper roughness more than blending clay with anatase nano-TiO2 pigments. Commercial nano-TiO2 pigments increased porosity of coated paper at both the 30% and 50% addition of nano-TiO2 pigments to clay, while laboratory-prepared nano-TiO2 pigments highly decreased it at 30% addition of nano-TiO2 to clay, compared to clay only. Blending of clay/nano-TiO2 pigments improved both brightness and opacity of the coated paper where commercial pigments are more effective. Burst, tensile strength, stretching, and TEA were improved in the case of all pigments. The 50% addition of the prepared and commercial nanopigments in conjunction with clay improved the mechanical coated paper properties more than 30% addition (except the cases of stretching and TEA of the commercial pigments). The coated paper samples were offset printed. It was found that blending of clay/nano-TiO2 pigments improved print density. Commercial nano-TiO2 pigments improved print gloss more than the laboratory-prepared ones. This result was found consistent with the results of coated paper roughness. Note de contenu : - EXPERIMENTAL : Materials - Preparation of titanium dioxide nanopigments - Application of nano-TiO2 pigments in paper coating - Preparation of coating mixtures and coated paper samples - Printing of coated paper samples - characterization of the nano-TiO2 and coated paper samples - RESULTS AND DISCUSSION : Characterization of the prepared and commercial titanium dioxide pigments - Application in paper coating DOI : 10.1007/s11998-015-9735-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9735-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26115 [article]

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Enhancing coated paper mechanical properties via doping kaolin with ammonium molybdate / Samya El-Sherbiny in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 6 (11/2018) . - p. 1379-1390 Titre : Enhancing coated paper mechanical properties via doping kaolin with ammonium molybdate Type de document : texte imprimé Auteurs : Samya El-Sherbiny, Auteur ; Nivin M. Ahmed, Auteur Année de publication : 2018 Article en page(s) : p. 1379-1390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Kaolin Molybdate d'ammonium Papier -- Propriétés mécaniques Papier et carton couché Thermogravimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Mechanical properties of paper coating layers are very important in converting and printing operations. Kaolin is commonly used in paper coating as cheap pigment in addition to its superior properties. In this study, a new approach for improving coated paper mechanical properties using doped kaolin with ammonium molybdate was presented. Kaolin and modified kaolin were characterized using several analyses tools (e.g., XRD, SEM, and EDX), and then they were applied in paper coating mixture. The results revealed that the dopant was found in the kaolin as MoOx; this oxide form with its needle shapes led to change in the kaolin crystals, and its presence in high concentrations led to exfoliation of kaolin. Also, at high concentration it was found that MoOx reacted with γ-alumina that is found in kaolin after its heating at 300°C to form aluminum molybdate. It can be observed that modified kaolin increased the coated paper porosity and consequently the opacity; also bulk and thickness were increased. Significant improvement in coated paper tensile strength, bursting strength, tensile energy absorption, and bending stiffness was also noticed. Thermal study also showed that increasing the concentration of ammonium molybdate increased the heat stability of the coated paper. Note de contenu : - EXPERIMENTAL : Materials - Chemical treatment of kaolin - Preparation of coating mixture - Preparation of coated paper samples - Characterization fo the treated kaolin and coated paper samples - RESULTS AND DISCUSSION : Characterization of unmodified kaolin and modified kaolin - Coated paper properties - Thermal analysis of coated paper DOI : 10.1007/s11998-016-9903-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9903-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31355 [article]

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Enhancing egyptian kaolinite via calcination and dealumination for application in paper coating / Samya El-Sherbiny in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 4 (07/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 4 (07/2015) . - p. 739-749 Titre : Enhancing egyptian kaolinite via calcination and dealumination for application in paper coating Type de document : texte imprimé Auteurs : Samya El-Sherbiny, Auteur ; Fatma A. Morsy, Auteur ; Mervat S. Hassan, Auteur ; Heba F. Mohamed, Auteur Année de publication : 2015 Article en page(s) : p. 739-749 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Calcination La calcination est une technique de préparation d'échantillon utilisée en chimie analytique qui permet de prendre en compte ce phénomène. Elle consiste à chauffer l'échantillon à haute température (typiquement 500 à 1 000 °C) sous air ou sous atmosphère neutre pour provoquer des réactions physiques et chimiques et mettre ainsi l'échantillon dans un état de référence. En effet, un certain nombre de propriétés des matériaux dépendent de la température et de l'historique de l'échantillon comme de l'humidité. La calcination permet de l'abstraire de ces effets et donc d'avoir des mesures reproductibles, de pouvoir comparer différents échantillons. En revanche, il faut être conscient que l'échantillon analysé n'est pas l'échantillon prélevé. La méthode est similaire à l'analyse des extraits secs mais utilise une température plus élevée. Kaolinite Papier et carton couché Pigments -- Propriétés optiques Index. décimale : 667.9 Revêtements et enduits Résumé : The aim of this study was to optimize the modification of Egyptian kaolinite for application in paper coating. The study focused on four modification methods; sedimentation process, chemical bleaching, calcination, and dealumination. The effect of these methods on the structure of kaolinite was studied using X-ray fluorescence (XRF), X-ray diffractometer (XRD), Fourier transform infrared spectrometer analysis, and field emission SEM. The original and modified kaolinites were applied in paper coating mixtures. The results of XRF analysis showed that the Fe2O3 and TiO2 in Egyptian kaolinite were reduced chemically via sodium dithionite from 0.41% to 0.25% and 2.20% to 2.00%, respectively. Calcination at 900°C, followed by acid activation and bleaching, showed a further decrease in Fe2O3 and TiO2 impurities to 0.012 and 1.45 (wt%), respectively. XRD results revealed that all characteristics reflection of kaolinite disappeared upon calcination. SEM investigation showed a significant reduction in kaolinite particle size. Calcination and dealumination of kaolinite did not improve coated paper roughness, while air permeance and optical properties significantly increased in comparison with commercial kaolinite. In addition, a significant improvement was observed in coated paper mechanical properties including burst, tensile strength, stretch, and tensile energy absorption with respect to original and commercial kaolinite. In contrast, the kaolinite fraction <2 µm highly improved paper gloss, print density, and print gloss, more than calcined kaolinite and its modified pigments. In conclusion, dealumination of calcined kaolinite did not show any further change in all coated paper properties compared to the calcined ones. Note de contenu : - EXPERIMENTAL : Materials - Modification of Egyptian kaolinite - Application of modified Egyptian kaolinite in paper coating - CHARACTERIZATION OF THE MODIFIED PIGMENTS AND COATED PAPER - RESULTS AND DISCUSSION : X-ray diffraction study - Coated paper specifications DOI : 10.1007/s11998-015-9672-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9672-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24408 [article]

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