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Tuning the Receding Contact Angle on Hydrogels by Addition of Particles

Author(s): Boulogne, François; Ingremeau, François; Limat, Laurent; Stone, Howard A

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Abstract: Control of the swelling, chemical functionalization, and adhesivity of hydrogels are finding new applications in a wide range of material systems. We investigate experimentally the effect of adsorbed particles on hydrogels on the depinning of contact lines. In our experiments, a water drop containing polystyrene microspheres is deposited on a swelling hydrogel, which leads to the drop absorption and particle deposition. Two regimes are observed: a decreasing drop height with a pinned contact line followed by a receding contact line. We show that increasing the particles concentration increases the duration of the first regime and significantly decreases the total absorption time. The adsorbed particles increase the pinning force at the contact line. Finally, we develop a method to measure the receding contact angle with the consideration of the hydrogel swelling.
Publication Date: 7-Jun-2016
Electronic Publication Date: 27-May-2016
Citation: Boulogne, François, Ingremeau, François, Limat, Laurent, Stone, Howard A. (2016). Tuning the Receding Contact Angle on Hydrogels by Addition of Particles. Langmuir, 32 (22), 5573 - 5579. doi:10.1021/acs.langmuir.6b01209
DOI: doi:10.1021/acs.langmuir.6b01209
ISSN: 0743-7463
EISSN: 1520-5827
Pages: 5573 - 5579
Type of Material: Journal Article
Journal/Proceeding Title: Langmuir
Version: Author's manuscript

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