Nonmonotonic swelling and compression dynamics of hydrogels in polymer solutions

Aangenendt, Frank J.; Punter, Melle T. J. J. M.; Mulder, Bela M.; Schoot, Paul van der; Wyss, Hans M.

doi:10.1103/physreve.102.062606

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…This would increase the effective viscosity inside the hydrogel and, therefore, also lead to a slow-down of the particle deformation, compared to the case without dextran added to the background liquid. However, as shown in our previous work [ 7 , 9 ], if the dextran macromolecules could fully penetrate the hydrogel, this would lead to a slow reswelling of the particles to their initial volume, with minimal effect on their elastic moduli K and G . However, when we exposed our particles to dextran, we observed a noticeable increase in their elastic moduli.…”

Section: Results and Discussionmentioning

confidence: 66%

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Single Hydrogel Particle Mechanics and Dynamics Studied by Combining Capillary Micromechanics with Osmotic Compression

Bakal

Pollet

Toonder

et al. 2023

Gels

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Hydrogels can exhibit a remarkably complex response to external stimuli and show rich mechanical behavior. Previous studies of the mechanics of hydrogel particles have generally focused on their static, rather than dynamic, response, as traditional methods for measuring single particle response at the microscopic scale cannot readily measure time-dependent mechanics. Here, we study both the static and the time-dependent response of a single batch of polyacrylamide (PAAm) particles by combining direct contact forces, applied by using Capillary Micromechanics, a method where particles are deformed in a tapered capillary, and osmotic forces are applied by a high molecular weight dextran solution. We found higher values of the static compressive and shear elastic moduli for particles exposed to dextran, as compared to water (KDex≈63 kPa vs. Kwater≈36 kPa, and GDex≈16 kPa vs. Gwater≈7 kPa), which we accounted for, theoretically, as being the result of the increased internal polymer concentration. For the dynamic response, we observed surprising behavior, not readily explained by poroelastic theories. The particles exposed to dextran solutions deformed more slowly under applied external forces than did those suspended in water (τDex≈90 s vs. τwater≈15 s). The theoretical expectation was the opposite. However, we could account for this behaviour by considering the diffusion of dextran molecules in the surrounding solution, which we found to dominate the compression dynamics of our hydrogel particles suspended in dextran solutions.

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Section: Results and Discussionmentioning

confidence: 66%

“…Even chemically simple hydrogels, such as polyacrylamide (PAAm), can exhibit a surprisingly complex mechanical response to external stimuli. PAAm hydrogel particles can exhibit transient deswelling–reswelling behavior when exposed to an osmotic shock [ 7 ] or an overshoot in the volume upon swelling in a polymer solution [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Single Hydrogel Particle Mechanics and Dynamics Studied by Combining Capillary Micromechanics with Osmotic Compression

Bakal

Pollet

Toonder

et al. 2023

Gels

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“…Firstly, it was explained by a relaxation process of the macromolecular chains (Shieh and Peppas 1991). Later, this behavior was related to the presence of osmolytes (low molecular weight organic compounds that influence the solvent quality when they penetrate in the hydrogel network) (Aangenendt et al 2020). Since this overshooting effect is observed only for nanocomposites, a first explanation could be that citrated ions of MNPs or the MNPs themselves play the role of osmolytes that induce the observation of this maximum swelling.…”

Section: Swellingmentioning

confidence: 99%

Study of the tunable mechanical and swelling properties of magnetic sensitive calcium alginate nanocomposite hydrogels

Varela-Feijoo

Ponton

2023

Rheol Acta

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Nanocomposite hydrogels were elaborated by the addition of citrated magnetic nanoparticles (MNPs) in sodium alginate aqueous solutions ionically crosslinked by in situ release of calcium ions from calcium carbonate (CaCO 3 ) with gradual hydrolysis of d-glucono-δ lactone (GDL). The sol-gel transition was studied by time-resolved mechanical spectroscopy (TRMS) in the linear viscoelastic region. The power law frequency dependence of the storage and loss moduli allowed to determine the gelation time (t g ), the power law relaxation exponent (Δ), and the gel stiffness (S) at the critical gel (gel at t g ) for different calcium and MNP concentrations. The effect of an applied magnetic field on these parameters was also studied for the first time. The obtained results show an effect of the concentration of both calcium and MNPs on the kinetics (t g ) and properties at the critical gel (S and Δ) obtaining faster kinetics and harder critical gels for higher calcium and lower MNP concentrations. Moreover, the application of the magnetic field allows to modulate the viscoelastic properties before the gel point, but no effect was observed on the structural properties of the critical gel. Finally, this work highlights how the shear viscoelastic, compressive, and swelling properties of totally gelled nanocomposite hydrogels can be successfully modulated when MNPs are introduced in the calcium alginate matrices with a good agreement between all these properties and with the properties of the critical gels.

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2023

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Nonmonotonic swelling and compression dynamics of hydrogels in polymer solutions

Cited by 7 publications

References 34 publications

Single Hydrogel Particle Mechanics and Dynamics Studied by Combining Capillary Micromechanics with Osmotic Compression

Single Hydrogel Particle Mechanics and Dynamics Studied by Combining Capillary Micromechanics with Osmotic Compression

Study of the tunable mechanical and swelling properties of magnetic sensitive calcium alginate nanocomposite hydrogels

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