Figure 1: ‘Semi-closed’ microfluidics systems. A Traditional microfluidics devices. B Passive systems for short-time operation: enhanced peeling strength of elastomeric film by internal channels; simplistic representation of the works in references [20-21]. C Active system for short-time operation: elastomeric surface of switchable adhesion adapted from Ref. [18]. D Passive system for long-time operation: self-replenished anti-fouling surface with embedded reservoirs; reprinted with permission of reference [24], copyright 2015 American Chemical Society.