Sodium alginate-grafted submicrometer particles display enhanced reversible aggregation/disaggregation properties
| Autor: | Jason Robert Tavares, Nick Virgilio, Faezeh Sabri, Antoine Marion, Louis Fradette, Kevin Berthomier |
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| Rok vydání: | 2017 |
| Předmět: |
Aqueous solution
Polymers and Plastics Chemistry Hydrogen bond Organic Chemistry Intermolecular force 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Grafting 01 natural sciences 0104 chemical sciences Chemical engineering Materials Chemistry Zeta potential Surface modification Fourier transform infrared spectroscopy 0210 nano-technology Macromolecule |
| Zdroj: | Carbohydrate polymers. 194 |
| ISSN: | 1879-1344 |
| Popis: | In this article, we demonstrate that submicrometer particles with surface-grafted sodium alginate (SA) display enhanced and reversible aggregation/disaggregation properties in aqueous solution. 300 nm silica particles were first functionalized with an aminosilane coupling agent, followed by the grafting of pH-sensitive SA, as confirmed by zeta potential, XPS and FTIR analyses. The SA-modified particles show enhanced aggregation properties at acidic pH compared to unmodified silica, with a 10 times increase in average aggregate diameter. The process is reversible, as the aggregates can be broken and dispersed again when the pH is increased back to 7.0. As a result, the sedimentation rate of SA-modified particles at pH 3.0 is both significantly faster and complete compared to the unmodified particles. This enhanced aggregation is most likely due to the formation of intermolecular hydrogen bonds between neighboring SA-modified particles. This work illustrates how surface-grafted macromolecules of natural origins can be used to tune interparticle interactions, in order to improve separation processes. |
| Databáze: | OpenAIRE |
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