Electrical wearable microfluidics‐based SLMDs. Admittance: a) structure and mechanism of a thin, wireless, battery‐free sweat analysis system. Reproduced with permission.[
191
] Copyright 2018, John Wiley & Sons; b) schematic of a wearable SLMD with a spiral microchannel and a pair of electrodes inside. Reproduced with permission.[
38
] Copyright 2018, American Chemical Society; c) exploded illustration of the various components of a multimodal sweat sensing platform. Reproduced with permission.[
69
] Copyright 2019, The Royal Society of Chemistry; d) structure and mechanism of a wearable patch with capability in continuous collection and measurement of both type of sweat loss; e) sweat loss data measured at 8 different regions. Reproduced with permission.[
67
] Copyright 2021, Springer Nature. Capacitance: f) structural diagram of a low‐cost, wearable capacitive SLMD; g) the validation study and on‐body test compared with Macroduct. Reproduced with permission.[
193
] Copyright 2020, American Chemical Society; h) structural diagram of a wireless wearable SLMD with high sensitivity; i) fully assembled device for measuring sweat rate and its on‐body tests. Reproduced with permission.[
194
] Copyright 2020, The Royal Society of Chemistry.