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. 2016 May 20;7:11566. doi: 10.1038/ncomms11566

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(a,b) Allan deviation of the static deflection of a hydrogel probe (length, width and thickness: 240, 50 and 10 μm) (a) and Allan deviation of the resonance frequency of another hydrogel probe (length, width and thickness: 220, 50 and 20 μm) (b) in air, water and PBS solution. (c,d) S.d. of the bending angles of three silicon (NSC36-B, Mikromasch) and three hydrogel probes with similar spring constants (c) and s.d. of the relative resonance frequencies of three silicon (BL-AC40TS, Olympus) and three hydrogel probes with similar resonance frequencies in air, water and PBS solution. Error bars represent s.d. of the average from three measurements for each device (N=9 measurements for each probe material).