Linking Friction and Surface Properties of Hydrogels Molded Against Materials of Different Surface Energies

Langmuir : the ACS Journal of Surfaces and Colloids
Yuki A MeierRok Simic

Abstract

Biological tissues subjected to rubbing, such as the cornea and eyelid or articular cartilage, are covered in brushy, hydrated mucous structures in order to reduce the shear stress on the tissue. To mimic such biological tissues, we have prepared polyacrylamide (PAAm) hydrogels with various concentrations of un-cross-linked chains on their surfaces by synthesizing them in molds of different surface energies. The selected molding materials included hydrophilic glass, polyoxymethylene (POM), polystyrene (PS), polyethylene (PE), polypropylene (PP), and polytetrafluoroethylene (PTFE). After synthesis, demolding, and equilibration in water, the elastic modulus at the hydrogel surface decreased with increasing water contact angle of the mold. The softer, brushier surfaces did not completely collapse under compressive pressures up to 10 kPa, remaining better hydrated compared to their denser, cross-linked analogs. The hydrogels with brushier surfaces displayed an order of magnitude lower coefficient of friction than the cross-linked ones, which is attributed to the ability of their near-surface regions to retain larger amounts of liquid at the interface. The characteristic speed-dependent friction of the denser, cross-linked hydrogel ...Continue Reading

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Citations

Apr 6, 2020·Soft Matter·Raisa E D RudgeElke Scholten
May 5, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Allison L ChauAngela A Pitenis
May 14, 2020·Proceedings of the National Academy of Sciences of the United States of America·Nicholas L CucciaJustin C Burton
Aug 6, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Javad TavakoliYouhong Tang
Oct 8, 2020·Soft Matter·Teresa T DuncanEdwin P Chan
May 25, 2021·ACS Applied Materials & Interfaces·Shikha AwasthiChandan Srivastava
Nov 4, 2020·ACS Applied Materials & Interfaces·Hui LiuFeng Zhou
Jan 15, 2020·ACS Applied Materials & Interfaces·Kaihuan ZhangNicholas D Spencer

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Methods Mentioned

BETA
atomic force microscopy

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