Polyphosphates can stabilize but also aggregate colloids
| Autor: | Jeroen S. van Duijneveldt, Bruna Luiza Batista de Lima, Rosangela de Carvalho Balaban, Ana Zélia Falcão Almeida, Rodrigo José de Oliveira, Rayssa Jossanea Brasileiro Motta, Ricardo Schneider |
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| Rok vydání: | 2019 |
| Předmět: |
Flocculation
Aggregate (composite) Materials science General Physics and Astronomy Ionic bonding 02 engineering and technology 021001 nanoscience & nanotechnology complex mixtures 01 natural sciences Dispersant Colloid Chemical engineering Dynamic light scattering Rheology 0103 physical sciences Particle Physical and Theoretical Chemistry 010306 general physics 0210 nano-technology |
| Zdroj: | Motta, R J B, Almeida, A Z F, de Lima, B L B, Schneider, R, Balaban, R D C, van Duijneveldt, J S & de Oliveira, R J 2019, ' Polyphosphates can stabilize but also aggregate colloids ', Physical Chemistry Chemical Physics, vol. 2020, no. 1, 15, pp. 15-19 . https://doi.org/10.1039/C9CP05225A |
| ISSN: | 1463-9084 |
| DOI: | 10.1039/C9CP05225A |
| Popis: | Phosphates are well known as dispersants for a variety of colloidal particles. Here however we use rheological measurements to show that high molecular weight polyphosphates (PP) can instead act as a flocculant for Laponite clay platelets. The proposed mechanism is bridging of PP between clay particle edges, leading to highly charged clusters forming a Wigner glass. Dynamic light scattering shows a bimodal cluster size distribution, independent of PP molecular weight, but the highest molecular weight gave the highest viscous and loss moduli for the PP-clay solid. These unique all-inorganic solids may have application in solid-state ionic conducting materials, controlled release fertilizers and biomedical applications. |
| Databáze: | OpenAIRE |
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