An oriented Fe3+-regulated lignin-based hydrogel with desired softness, conductivity, stretchability, and asymmetric adhesiveness towards anti-interference pressure sensors.

International Journal of Biological Macromolecules
Qinhua WangYonghao Ni

Abstract

The development of conductive, soft, ultra-stretchable, and asymmetrically adhesive hydrogels is difficult and essential for both wearable electronics and anti-adhesion tissue dressings. In particular, there is still no simple, effective and universal approach to construct an asymmetrically adhesive multifunctional hydrogel. Here, we first synthesized lignosulfonate sodium (LS)-doped PAA hydrogels with uniform adhesion (adhesive strength: ~30.5 kPa), conductivity (~0.45 S/m), stretchability (up to ~2250%), and low compressive modulus (~20 kPa). In the second step, an oriented soaking of Fe3+ onto the upper surface of the resultant composite hydrogel renders the upper surface non-adhesive. This novel strategy masterfully delivers asymmetric adhesion behavior to the upper and bottom surfaces of the same hydrogel (~0 kPa adhesive strength for the upper surface; strong adhesive strength of ~27 kPa for the bottom surface). The asymmetric adhesive hydrogel has proven to adhere well onto the human skin and achieve waste-barrier. Importantly, this hydrogel assembled pressure sensor demonstrates excellent anti-interference and wearable comfort.

References

Jan 27, 2019·International Journal of Biological Macromolecules·Ying ChenFuxiang Chu
Sep 30, 2020·Nature Materials·Jue DengXuanhe Zhao
Dec 4, 2020·Journal of Colloid and Interface Science·Xiaoyong ZhangHongbo Zeng
Sep 10, 2018·ACS Biomaterials Science & Engineering·Xiaofeng PanLiulian Huang
Mar 27, 2021·International Journal of Biological Macromolecules·Qinhua WangYonghao Ni
Jul 27, 2021·ACS Sustainable Chemistry & Engineering·Mario CulebrasMaurice N Collins

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