Tunable distribution of silica nanoparticles in water-borne coatings via strawberry supracolloidal dispersions

Siyu Li, Leendert G.J. van der Ven, Anne B. Spoelstra, Remco Tuinier, A. Catarina C. Esteves (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

2 Citaten (Scopus)
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Samenvatting

Hypothesis: Water-borne coatings are rapidly expanding as sustainable alternatives to organic solvent-borne systems. Inorganic colloids are often added to aqueous polymer dispersions to enhance the performance of water-borne coatings. However, these bimodal dispersions have many interfaces which can result in unstable colloids and undesirable phase separation. The covalent bonding between individual colloids, on a polymer-inorganic core-corona supracolloidal assembly, could reduce or suppress instability and phase separation during drying of coatings, advancing its mechanical and optical properties. Methods: Aqueous polymer-silica supracolloids with a core-corona strawberry configuration were used to precisely control the silica nanoparticles distribution within the coating. The interaction between polymer and silica particles was fine-tuned to obtain covalently bound or physically adsorbed supracolloids. Coatings were prepared by drying the supracolloidal dispersions at room temperature, and their morphology and mechanical properties were interconnected. Findings: Covalently bound supracolloids provided transparent coatings with a homogeneous 3D percolating silica nanonetwork. Supracolloids having physical adsorption only, resulted in coatings with a stratified silica layer at interfaces. The well-arranged silica nanonetworks strongly improve the storage moduli and water resistance of the coatings. These supracolloidal dispersions offer a new paradigm for preparing water-borne coatings with enhanced mechanical properties and other functionalities, like structural color.

Originele taal-2Engels
Pagina's (van-tot)185-197
Aantal pagina's13
TijdschriftJournal of Colloid and Interface Science
Volume646
DOI's
StatusGepubliceerd - 15 sep. 2023

Bibliografische nota

Funding Information:
The authors are grateful for the financial support from the Advanced Research Center for Chemical Building Blocks, ARC CBBC, which is co-founded and co-financed by the Dutch Research Council (NWO) and the Netherlands Ministry of Economic Affairs and Climate Policy. Dr. Gerard van Ewijk (AkzoNobel), Dr. Daniel Persson (Nouryon), Dr. Keimpe van der Berg (AkzoNobel), Dr. Per Restorp (Nouryon), Dr. Heiner Friedrich and Dr. Bart J.F. Erich are acknowledged for their useful insights and discussions. Akal D. Aras and Rick R.M Joosten are thanked for their assistance with water permeability and cryo-TEM measurement, respectively. Pauline Schmit is acknowledged for her assistance with cryo-microtoming of the coating sections for depth-resolved IR.

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