2018
DOI: 10.1016/j.carbpol.2018.04.012
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Sodium alginate-grafted submicrometer particles display enhanced reversible aggregation/disaggregation properties

Abstract: 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 … Show more

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Cited by 15 publications
(12 citation statements)
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“…As mentioned previously, all emulsions prepared with SP-SA particles display a thicker or more viscous texture as compared to emulsions prepared with SP particles (Figure S3e-f). In agreement with previous findings 30 , particles modified with SA could experience stronger attractive interparticle interactions due to hydrogen bond formation -especially at pH 3.0, below the pKa of SA -, which might explain the more viscous appearance. Optical microscopy was employed to calculate the average droplet size as a function of ϕo and pH.…”
Section: Sodium-alginate Modified Particles Stabilize Oilin-water Emulsionssupporting
confidence: 92%
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“…As mentioned previously, all emulsions prepared with SP-SA particles display a thicker or more viscous texture as compared to emulsions prepared with SP particles (Figure S3e-f). In agreement with previous findings 30 , particles modified with SA could experience stronger attractive interparticle interactions due to hydrogen bond formation -especially at pH 3.0, below the pKa of SA -, which might explain the more viscous appearance. Optical microscopy was employed to calculate the average droplet size as a function of ϕo and pH.…”
Section: Sodium-alginate Modified Particles Stabilize Oilin-water Emulsionssupporting
confidence: 92%
“…Both  and Ɵo/w confirmed surface grafting of APTMS and TMPS silanes onto bare silica particles, followed by the covalent reaction of SA with APTMS, yielding pH-sensitive sodium alginate grafted sub-m particles. 30 XPS and FTIR characterization of the particles before and after surface modification was completed previously. 30 These experiments confirmed the sequential grafting of the silane coupling agent (APTMS) and sodium alginate onto SP particles.…”
Section: Zeta Potential and Contact Angle Measurements Confirm Sodium Alginate Graftingmentioning
confidence: 99%
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