On the role of softness in ionic microgel interactions

Bergman, Maxime J.; Nojd, Söfi; Mohanty, Priti S.; Boon, Niels; Immink, Jasper N.; Maris, J. J. Erik; Stenhammar, Joakim; Schurtenberger, Peter

doi:10.1039/d1sm01222c

Cited by 3 publications

(4 citation statements)

References 44 publications

(82 reference statements)

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“…they will have comparable S I . If the charges are not screened, ionic nanogels have a much larger value of S I and can be considered softer in terms of interpenetration . Ionic nanogels have been observed to have markedly slow diffusion in solution and do not crystallize as easily as their neutral counterparts as a consequence of softness defined as interpenetration, and characterized by the large value of S I .…”

Section: Discussionmentioning

confidence: 99%

“…144 For these particles, the interpenetration of the chains plays a key role in their diffusion well below the random close packing concentration. 117,163 In contrast, if the nanogels in solution have significantly different values of S D and S E , isotropic deswelling and faceting, with S F > 0, are more significant and S I ≈ 0.…”

Section: Osmotic Pressure Deformation Deswelling and Interpenetrationmentioning

confidence: 98%

“…This is consistent with what observed in the literature for ionic nanogels, for which the polymeric chains can extend significantly due to ionic effects and the particles assume a porcupine-like architecture . For these particles, the interpenetration of the chains plays a key role in their diffusion well below the random close packing concentration. , In contrast, if the nanogels in solution have significantly different values of S D and S E , isotropic deswelling and faceting, with S F > 0, are more significant and S I ≈ 0.…”

Section: Softness and Collective Behavior In Bulkmentioning

confidence: 99%

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How Softness Matters in Soft Nanogels and Nanogel Assemblies

et al. 2022

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Softness plays a key role in determining the macroscopic properties of colloidal systems, from synthetic nanogels to biological macromolecules, from viruses to star polymers. However, we are missing a way to quantify what the term “softness” means in nanoscience. Having quantitative parameters is fundamental to compare different systems and understand what the consequences of softness on the macroscopic properties are. Here, we propose different quantities that can be measured using scattering methods and microscopy experiments. On the basis of these quantities, we review the recent literature on micro- and nanogels, i.e. cross-linked polymer networks swollen in water, a widely used model system for soft colloids. Applying our criteria, we address the question what makes a nanomaterial soft? We discuss and introduce general criteria to quantify the different definitions of softness for an individual compressible colloid. This is done in terms of the energetic cost associated with the deformation and the capability of the colloid to isotropically deswell. Then, concentrated solutions of soft colloids are considered. New definitions of softness and new parameters, which depend on the particle-to-particle interactions, are introduced in terms of faceting and interpenetration. The influence of the different synthetic routes on the softness of nanogels is discussed. Concentrated solutions of nanogels are considered and we review the recent results in the literature concerning the phase behavior and flow properties of nanogels both in three and two dimensions, in the light of the different parameters we defined. The aim of this review is to look at the results on micro- and nanogels in a more quantitative way that allow us to explain the reported properties in terms of differences in colloidal softness. Furthermore, this review can give researchers dealing with soft colloids quantitative methods to define unambiguously which softness matters in their compound.

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Section: Discussionmentioning

confidence: 99%

Section: Osmotic Pressure Deformation Deswelling and Interpenetrationmentioning

confidence: 98%

Section: Softness and Collective Behavior In Bulkmentioning

confidence: 99%

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How Softness Matters in Soft Nanogels and Nanogel Assemblies

et al. 2022

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“…In case the polymeric details of a nanogel can be neglected, coarser models based on the Hertzian potential are used 78,79 . In the work 80 , Yukawa-type electrostatic repulsion was also added. In general, not only charged nanogles have been theoretically studied 67,68,81,82 , but also nanogels, functionalised with magnetic particles 77,83 .…”

Section: Introductionmentioning

confidence: 99%