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. 2022 May 20;8(20):eabo1396. doi: 10.1126/sciadv.abo1396

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Fig. 2. — (A) Rheological characterization of biogels with different recipes at a temperature sweep from 75° to 10°C, showing their transition between viscous liquid state and elastic gel state. (B) The corresponding tanδ (G″/G′) calculated from data in (A). (C) Representative stress-strain curve of biogel at ambient temperature. Inset shows the photograph of the pristine and stretched biogel at ambient temperature. (D) Interfacial adhesion force of on-skin painted biogel and commercial solid-like ECG gel on skin. (E) Electrode-skin impedance spectra for commercial solid-like ECG gel, commercial EEG paste, and on-skin painted biogels. (F) Adhesive force for on-skin painted biogel-electrode and commercial EEG paste-electrode interfaces.