Effects of the polymer glass transition on the stability of nanoparticle dispersions

In addition to the repulsive and attractive interaction forces described by Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, many charged colloid systems are stabilized by non-DLVO contributions stemming from specific material attributes. Here, we investigate non-DLVO contributions to the stability o...

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Bibliographic Details
Published inSoft matter Vol. 19; no. 6; pp. 1212 - 1218
Main Authors Scott, Douglas M, Prud'homme, Robert K, Priestley, Rodney D
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 08.02.2023
Subjects
Cations
Colloids
Dispersions
Glass transition temperature
Hydrophobicity
Ion adsorption
Nanoparticles
Polymers
Potassium chloride
Room temperature
Stability
Surface layers
Transition temperatures
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Summary:In addition to the repulsive and attractive interaction forces described by Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, many charged colloid systems are stabilized by non-DLVO contributions stemming from specific material attributes. Here, we investigate non-DLVO contributions to the stability of polymer colloids stemming from the intra-particle glass transition temperature ( T g ). Flash nanoprecipitation is used to fabricate nanoparticles (NPs) from a library of polymers and dispersion stability is studied in the presence of both hydrophilic and hydrophobic salts. When adding KCl, stability undergoes a discontinuous decrease as T g increases above room temperature, indicating greater stability of rubbery NPs over glassy NPs. Glassy NPs are also found to interact strongly with hydrophobic phosphonium cations (PR 4 + ), yielding charge inversion and intermediate aggregation while rubbery NPs resist ion adsorption. Differences in the lifetime of ionic structuration within mobile surface layers is presented as a potential mechanism underlying the observed phenomenon. The stability of polymer nanoparticle dispersions is strongly impacted by the glass transition temperature of constituent polymers.
Bibliography:Electronic supplementary information (ESI) available: Descriptions of the methods and materials used in this study as well as a summary of the diameters and zeta potentials of polymeric NPs produced
FNP. Aggregation trends for NP dispersions salted with KCl as well as PS and PI NP dispersions with NH
F and GdmCl. See DOI
4
https://doi.org/10.1039/d2sm01595a
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ISSN:1744-683X
1744-6848
DOI:10.1039/d2sm01595a