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Characterization and rheological properties of kaolinite−silicon Oil pastes / Dogan, Mehmet in Industrial & engineering chemistry research, Vol. 47 n°21 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8218–8227 Titre : Characterization and rheological properties of kaolinite−silicon Oil pastes Type de document : texte imprimé Auteurs : Dogan, Mehmet, Auteur ; Zürriye Yilmaz, Auteur ; Alkan, Mahir, Auteur Année de publication : 2008 Article en page(s) : p. 8218–8227 Note générale : chemical engineering Langues : Anglais (eng) Mots-clés : oil  pastes Résumé : A description of experiments carried out to determine the effect of some parameters on the extrusion behavior of particulate pastes is given. The effects of particle size, solid/liquid ratio, temperature, shear rate, and die dimensiones on rheological behavior of kaolinite−silicon oil pastes were investigated. These pastes were prepared by mixing kaolinite powder with chosen amounts of silicon oil. Capillary rheometry was used to determine the extrusion properties of the pastes. All pastes were found to exhibit non-Newtonian, pseudoplastic behavior under all experimental conditions. The viscosity decreased with an increase in temperature and particle size and with a decrease in solid/liquid ratio. The whole paste was properly described by the Herschel−Bulkley model and exhibited a shear thinning behavior. The yield stress increased with an increase in particle size and kaolinite amount and a decrease in temperature, reflecting the increase in paste viscosity. The flow behavior index, n, varied in the range of 0.077−0.534. The Arrhenius model gave a good description of the temperature effect on the shear viscosity of paste, and the Ea value appeared in the range of 7.4−32.6 kJ/mol. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800727d [article] Characterization and rheological properties of kaolinite−silicon Oil pastes [texte imprimé] / Dogan, Mehmet, Auteur ; Zürriye Yilmaz, Auteur ; Alkan, Mahir, Auteur . - 2008 . - p. 8218–8227. chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°21 (Novembre 2008) . - p. 8218–8227 Mots-clés : oil  pastes Résumé : A description of experiments carried out to determine the effect of some parameters on the extrusion behavior of particulate pastes is given. The effects of particle size, solid/liquid ratio, temperature, shear rate, and die dimensiones on rheological behavior of kaolinite−silicon oil pastes were investigated. These pastes were prepared by mixing kaolinite powder with chosen amounts of silicon oil. Capillary rheometry was used to determine the extrusion properties of the pastes. All pastes were found to exhibit non-Newtonian, pseudoplastic behavior under all experimental conditions. The viscosity decreased with an increase in temperature and particle size and with a decrease in solid/liquid ratio. The whole paste was properly described by the Herschel−Bulkley model and exhibited a shear thinning behavior. The yield stress increased with an increase in particle size and kaolinite amount and a decrease in temperature, reflecting the increase in paste viscosity. The flow behavior index, n, varied in the range of 0.077−0.534. The Arrhenius model gave a good description of the temperature effect on the shear viscosity of paste, and the Ea value appeared in the range of 7.4−32.6 kJ/mol. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800727d

Poly(vinyl chloride)/kaolinite nanocomposites / Turhan, Yasemin in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1503–1513 Titre : Poly(vinyl chloride)/kaolinite nanocomposites : characterization and thermal and optical properties Type de document : texte imprimé Auteurs : Turhan, Yasemin, Auteur ; Dogan, Mehmet, Auteur ; Alkan, Mahir, Auteur Année de publication : 2010 Article en page(s) : pp 1503–1513 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanocomposites  Kaolinite  X-ray  diffraction  Thermal  Optical  Properties. Résumé : Nanocomposites of poly(vinyl chloride) (PVC) have been prepared by solution intercalation method using both natural and modified kaolinites. Kaolinite was modified with dimethyl sulfoxide (DMSO) to expand the interlayer basal spacing. The characterization of PVC/kaolinite nanocomposites was made by X-ray diffraction (XRD) and transmission electron microscopy (TEM); the interactions between kaolinite and PVC was discussed by FTIR-ATR; the thermal stability was determined by simultaneous DTA/TG. FTIR-ATR confirms hydrogen bonds formed between dimethyl sulfoxide molecules and the inner surface hydroxyl groups of kaolinite. XRD and TEM results give evidence that kaolinite was dramatically intercalated into nanoscale and homogenously dispersed in the PVC matrix. Thermogravimetric analysis indicated that introduction of clay to the polymer network resulted in an increase in thermal stability. Ultraviolet (UV) absorbance experiments showed that nanocomposites have a higher UV transmission than PVC film. The Kissinger method was used for calculation the decomposition activation energy. The results have shown that activation energy values at both stages for PVC/kaolinite nanocomposite are higher than those of pure PVC, indicating that addition of kaolinite particles improves thermal stability of PVC. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901384x [article] Poly(vinyl chloride)/kaolinite nanocomposites : characterization and thermal and optical properties [texte imprimé] / Turhan, Yasemin, Auteur ; Dogan, Mehmet, Auteur ; Alkan, Mahir, Auteur . - 2010 . - pp 1503–1513. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1503–1513 Mots-clés : Nanocomposites  Kaolinite  X-ray  diffraction  Thermal  Optical  Properties. Résumé : Nanocomposites of poly(vinyl chloride) (PVC) have been prepared by solution intercalation method using both natural and modified kaolinites. Kaolinite was modified with dimethyl sulfoxide (DMSO) to expand the interlayer basal spacing. The characterization of PVC/kaolinite nanocomposites was made by X-ray diffraction (XRD) and transmission electron microscopy (TEM); the interactions between kaolinite and PVC was discussed by FTIR-ATR; the thermal stability was determined by simultaneous DTA/TG. FTIR-ATR confirms hydrogen bonds formed between dimethyl sulfoxide molecules and the inner surface hydroxyl groups of kaolinite. XRD and TEM results give evidence that kaolinite was dramatically intercalated into nanoscale and homogenously dispersed in the PVC matrix. Thermogravimetric analysis indicated that introduction of clay to the polymer network resulted in an increase in thermal stability. Ultraviolet (UV) absorbance experiments showed that nanocomposites have a higher UV transmission than PVC film. The Kissinger method was used for calculation the decomposition activation energy. The results have shown that activation energy values at both stages for PVC/kaolinite nanocomposite are higher than those of pure PVC, indicating that addition of kaolinite particles improves thermal stability of PVC. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901384x

Removal of reactive blue 221 by kaolinite from aqueous solutions / Karaoglu, M. Hamdi in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1534–1540 Titre : Removal of reactive blue 221 by kaolinite from aqueous solutions Type de document : texte imprimé Auteurs : Karaoglu, M. Hamdi, Auteur ; Dogan, Mehmet, Auteur ; Alkan, Mahir, Auteur Année de publication : 2010 Article en page(s) : pp 1534–1540 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption  Reactive  blue  Aqueous  Solutions. Résumé : The adsorption behavior of reactive blue 221 (RB221) on kaolinite was investigated by batch tests. The experiments were performed by employing a spectrophotometer to measure the concentration of RB221 before and after adsorption. The effects of various parameters such as initial solution pH, ionic strength, temperature, and acid activation were determined. The adsorption process reached equilibrium within 3 h. The adsorbed amount of RB221 increased with increasing ionic strength, temperature, and acid activation, but it decreased with increasing pH. Langmuir and Freundlich isotherms were applied to fit the equilibrium data to identify the best isotherm to describe the RB221 adsorption. The data were best described by the Langmuir isotherm. The isosteric heat of adsorption indicated the endothermic nature of RB221 adsorption on kaolinite. It was concluded that reactive blue 221 physically adsorbs on kaolinite. The value of the dimensionless separation factor (RL) suggests that kaolinite can be used for the removal of reactive blue 221 from aqueous solutions. The experimental results were applied to a batch design. As a result, kaolinite could be used for the removal of dyes from aqueous solutions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9017258 [article] Removal of reactive blue 221 by kaolinite from aqueous solutions [texte imprimé] / Karaoglu, M. Hamdi, Auteur ; Dogan, Mehmet, Auteur ; Alkan, Mahir, Auteur . - 2010 . - pp 1534–1540. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1534–1540 Mots-clés : Adsorption  Reactive  blue  Aqueous  Solutions. Résumé : The adsorption behavior of reactive blue 221 (RB221) on kaolinite was investigated by batch tests. The experiments were performed by employing a spectrophotometer to measure the concentration of RB221 before and after adsorption. The effects of various parameters such as initial solution pH, ionic strength, temperature, and acid activation were determined. The adsorption process reached equilibrium within 3 h. The adsorbed amount of RB221 increased with increasing ionic strength, temperature, and acid activation, but it decreased with increasing pH. Langmuir and Freundlich isotherms were applied to fit the equilibrium data to identify the best isotherm to describe the RB221 adsorption. The data were best described by the Langmuir isotherm. The isosteric heat of adsorption indicated the endothermic nature of RB221 adsorption on kaolinite. It was concluded that reactive blue 221 physically adsorbs on kaolinite. The value of the dimensionless separation factor (RL) suggests that kaolinite can be used for the removal of reactive blue 221 from aqueous solutions. The experimental results were applied to a batch design. As a result, kaolinite could be used for the removal of dyes from aqueous solutions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9017258