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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Mocchiutti, Paulina Galván, María V. Peresin, María S. Schnell, Carla N. Zanuttini, Miguel A. |
| Description | Author Affiliation: Mocchiutti P ( Instituto de Tecnología Celulósica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2654, Santa Fe, Argentina. Electronic address: paulinam@fiq.unl.edu.ar.); Galván MV ( Instituto de Tecnología Celulósica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2654, Santa Fe, Argentina.); Peresin MS ( Technical Research Centre of Finland, VTT, Biologinkuja 7, P.O. Box 1000, Espoo, Finland. Electronic address: soledad.peresin@vtt.fi.); Schnell CN ( Instituto de Tecnología Celulósica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2654, Santa Fe, Argentina.); Zanuttini MA ( Instituto de Tecnología Celulósica, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2654, Santa Fe, Argentina.) |
| Abstract | In this work, polyelectrolyte complexes (PECs) were formed by adding polyacrylic acid (PAA) or 4-O-methylglucuronoxylan (Xyl) on poly(allylamine hydrochloride) (PAH) solutions, at different ionic strength and neutral pH. Turbidity curves, charge densities of the cationic complexes determined by polyelectrolyte titration method, and z-potential values showed clear differences between both complexes. Stirring favourably reverses the effects of sedimentation of Xyl/PAH complexes, as demonstrated by colloidal stability tests. Adsorption studies on silica surfaces, performed by Quartz Crystal Microbalance with Dissipation (QCM-D) showed that PAA/PAH adsorbed complexes layers were rigid, while the corresponding Xyl/PAH layers were viscoelastic. Despite the different conformations, both complexes were adsorbed as spherical particles, as observed by Atomic Force Microscopy (AFM). Adsorption isotherms performed on fibre suspensions showed that the ionic strength of the liquid medium determines the amount of PEC retained. Finally, it was found that the papermaking properties were significantly increased due to the addition of these PECs. |
| File Format | HTM / HTML |
| ISSN | 01448617 |
| Volume Number | 116 |
| e-ISSN | 18791344 |
| Journal | Carbohydrate Polymers |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-02-13 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry__semicolon__materials Discipline Science Acrylic Resins Chemistry Polyamines Xylans Adsorption Elasticity Nephelometry And Turbidimetry Paper Quartz Crystal Microbalance Techniques Silicon Dioxide Surface Properties Viscosity Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Materials Chemistry Polymers and Plastics |
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