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Performance evaluation of poly(amide - imide) incorporated cellulose acetate ultrafiltration membranes in the separation of proteins and its fouling propensity by AFM imaging / Sahadevan Rajesh in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14016–14029 Titre : Performance evaluation of poly(amide - imide) incorporated cellulose acetate ultrafiltration membranes in the separation of proteins and its fouling propensity by AFM imaging Type de document : texte imprimé Auteurs : Sahadevan Rajesh, Auteur ; Ayyavoo Jayalakshmi, Auteur ; Sundararaj Senthilkumar, Auteur Année de publication : 2012 Article en page(s) : pp. 14016–14029 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Cellulose  Ultrafiltration  Membranes Résumé : Polymeric membranes intended to be used in protein separation must be fouling resistant in order to reduce the interactions with proteins during operation. Therefore, cellulose acetate (CA) membranes with superior properties were prepared by phase inversion technique using high-performance thermoplastic poly(amide-imide) (PAI) as the modification agent. The prepared membranes were characterized using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), molecular weight cutoff, and pore size to investigate the influence of PAI on the properties of the resultant membranes. Intermolecular interactions between the components in blend membranes were established by ATR-FTIR and SEM analysis showed that the blend CA membranes have thinner top layer and higher porosity in the sublayer. These prepared membranes were subjected to the separation of proteins such as bovine serum albumin, egg albumin, pepsin, and trypsin. The fouling-resistant capability of the membranes was studied by bovine serum albumin as the model protein and increase in resistance during protein filtration was calculated by means of resistance in series model analysis. The fouled membranes were characterized by AFM imaging and these membranes were cleaned by washing with deionized water and subsequent sonication. From the AFM images of the fouled membranes it was clear that preferential adsorption takes place at specific locations on the membrane surface and is a function of surface roughness and membrane hydrophilicity. It is worth mentioning that the incorporation of poly(amide-imide) into the cellulose acetate matrix is an effective method for the development of low fouling ultrafiltration membranes for the separation of proteins. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201181h [article] Performance evaluation of poly(amide - imide) incorporated cellulose acetate ultrafiltration membranes in the separation of proteins and its fouling propensity by AFM imaging [texte imprimé] / Sahadevan Rajesh, Auteur ; Ayyavoo Jayalakshmi, Auteur ; Sundararaj Senthilkumar, Auteur . - 2012 . - pp. 14016–14029. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 14016–14029 Mots-clés : Cellulose  Ultrafiltration  Membranes Résumé : Polymeric membranes intended to be used in protein separation must be fouling resistant in order to reduce the interactions with proteins during operation. Therefore, cellulose acetate (CA) membranes with superior properties were prepared by phase inversion technique using high-performance thermoplastic poly(amide-imide) (PAI) as the modification agent. The prepared membranes were characterized using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), molecular weight cutoff, and pore size to investigate the influence of PAI on the properties of the resultant membranes. Intermolecular interactions between the components in blend membranes were established by ATR-FTIR and SEM analysis showed that the blend CA membranes have thinner top layer and higher porosity in the sublayer. These prepared membranes were subjected to the separation of proteins such as bovine serum albumin, egg albumin, pepsin, and trypsin. The fouling-resistant capability of the membranes was studied by bovine serum albumin as the model protein and increase in resistance during protein filtration was calculated by means of resistance in series model analysis. The fouled membranes were characterized by AFM imaging and these membranes were cleaned by washing with deionized water and subsequent sonication. From the AFM images of the fouled membranes it was clear that preferential adsorption takes place at specific locations on the membrane surface and is a function of surface roughness and membrane hydrophilicity. It is worth mentioning that the incorporation of poly(amide-imide) into the cellulose acetate matrix is an effective method for the development of low fouling ultrafiltration membranes for the separation of proteins. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201181h

Preparation, morphology, performance, and hydrophilicity studies of poly(amide-imide) incorporated cellulose acetate ultrafiltration membranes / Sahadevan Rajesh in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5550-5564 Titre : Preparation, morphology, performance, and hydrophilicity studies of poly(amide-imide) incorporated cellulose acetate ultrafiltration membranes Type de document : texte imprimé Auteurs : Sahadevan Rajesh, Auteur ; Kavalapara H. Shobana, Auteur ; Selvaraj Anitharaj, Auteur Année de publication : 2011 Article en page(s) : pp. 5550-5564 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Membrane  separation  Ultrafiltration  Morphology  Preparation Résumé : Fouling-resistant cellulose acetate (CA) membranes were prepared by the phase inversion technique using hydrophilic poly(amide-imide) (PAI) as the modification agent. The prepared membranes were characterized using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), pure water flux, water content, porosity, and contact angle technique to investigate the influence of PAI on the final properties of the membranes. Intermolecular interactions between the components in blend membranes were established byATR-FTIR, and semicrystalline nature was conhrmed by XRD. SEM analysis showed that blend CA membranes have a thinner top layer and higher porosity in the sublayer. AFM surface roughness analysis data substantiate the enhanced surface porosity with an increase in PAI content, while the mean pore size decreases. The contact angle measurements indicated that the hydrophilicity of the CA membranes was improved by the addition of PAI due to the preferential orientation of functional groups towards the surface. Moreover, the surface free energy parameters of the membrane such as surface free energy, interfacial free energy, work of adhesion, and spreading coefficient were calculated. From the results, it was revealed that low interfacial free energy membranes prepared by the incorporation of PAI may be valuable in fouling-resistant industrial separations. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128678 [article] Preparation, morphology, performance, and hydrophilicity studies of poly(amide-imide) incorporated cellulose acetate ultrafiltration membranes [texte imprimé] / Sahadevan Rajesh, Auteur ; Kavalapara H. Shobana, Auteur ; Selvaraj Anitharaj, Auteur . - 2011 . - pp. 5550-5564. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5550-5564 Mots-clés : Membrane  separation  Ultrafiltration  Morphology  Preparation Résumé : Fouling-resistant cellulose acetate (CA) membranes were prepared by the phase inversion technique using hydrophilic poly(amide-imide) (PAI) as the modification agent. The prepared membranes were characterized using attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), pure water flux, water content, porosity, and contact angle technique to investigate the influence of PAI on the final properties of the membranes. Intermolecular interactions between the components in blend membranes were established byATR-FTIR, and semicrystalline nature was conhrmed by XRD. SEM analysis showed that blend CA membranes have a thinner top layer and higher porosity in the sublayer. AFM surface roughness analysis data substantiate the enhanced surface porosity with an increase in PAI content, while the mean pore size decreases. The contact angle measurements indicated that the hydrophilicity of the CA membranes was improved by the addition of PAI due to the preferential orientation of functional groups towards the surface. Moreover, the surface free energy parameters of the membrane such as surface free energy, interfacial free energy, work of adhesion, and spreading coefficient were calculated. From the results, it was revealed that low interfacial free energy membranes prepared by the incorporation of PAI may be valuable in fouling-resistant industrial separations. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128678