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Open AccessArticle

A Way to Predict Gold Nanoparticles/Polymer Hybrid Microgel Agglomeration Based on Rheological Studies

Institute of Polymer Science and Technology (ICTP-CSIC), C/Juan de la Cierva 3, 28006 Madrid, Spain
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Nanomaterials 2019, 9(10), 1499; https://doi.org/10.3390/nano9101499
Received: 10 September 2019 / Revised: 9 October 2019 / Accepted: 11 October 2019 / Published: 21 October 2019
(This article belongs to the Special Issue Functional Biodegradable Nanocomposites)
In this work, a detailed rheological study of hybrid poly(acrylamide-co-acrylic acid) P(AAm-co-AAc) aqueous microgel dispersions is performed. Our intention is to understand how the presence of gold nanoparticles, AuNP, embedded within the microgel matrix, affects the viscoelastic properties, the colloidal gel structure formation, and the structure recovery after cessation of the deformation of the aqueous microgel dispersions. Frequency sweep experiments confirmed that hybrid microgel dispersions present a gel-like behavior and that the presence of AuNP content within microgel matrix contributes to the elasticity of the microgel dispersions. Strain sweep test confirmed that hybrid microgels aqueous dispersion also form colloidal gel structures that break upon deformation but that can be recovered when the deformation decreases. The fractal analysis performed to hybrid microgels, by applying Shih et al. and Wu and Morbidelli’s scaling theories, evidenced that AuNP significantly affects the colloidal gel structure configuration ending up with the formation of agglomerates or microgel clusters with closer structures in comparison to the reference P(AAm-co-AAc) aqueous microgel dispersions. View Full-Text
Keywords: polymer microgels; hybrid microgels; thermoresponsive; rheology; scaling theory; fractal analysis polymer microgels; hybrid microgels; thermoresponsive; rheology; scaling theory; fractal analysis
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MDPI and ACS Style

Echeverría, C.; Mijangos, C. A Way to Predict Gold Nanoparticles/Polymer Hybrid Microgel Agglomeration Based on Rheological Studies. Nanomaterials 2019, 9, 1499.

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