Improving the stability of titania nanosheets by functionalization with polyelectrolytes
作者： Paul Rouster , Marko Pavlovic , Istvan Szilagyi
DOI: 10.1039/C6RA23707J
关键词: Polyelectrolyte 、 Chloride 、 Aqueous solution 、 Ionic bonding 、 Adsorption 、 Electrophoresis 、 Chemical engineering 、 Surface modification 、 Nanotechnology 、 Colloid 、 Materials science
摘要: Titania nanosheets (TNS) have been synthesized by the hydrothermal method and functionalized with poly(diallyldimethylammonium chloride) (PDADMAC) or poly(acrylamide-co-diallyldimethylammonium (P(AAm-co-DADMAC)) polyelectrolytes. The morphology composition of materials were investigated X-ray diffraction microscopy techniques. polyelectrolyte coating led to dramatic changes in charging behavior colloidal stability TNS aqueous suspensions, as revealed electrophoretic light scattering measurements. adsorption PDADMAC P(AAm-co-DADMAC) on oppositely charged surface gave rise charge neutralization reversal at appropriate doses unstable stable respectively. In latter situation, resistant against aggregation even high ionic strengths where bare rapidly aggregated. Highly suspensions obtained especially presence layer due repulsive interparticle forces originating from both electrostatic steric interactions. excellent are promising candidates carrier systems for instance biomedical treatments, homogeneous distribution primary particles is required delivery biologically active molecules.
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