Liquid self-driving method and device based on PDMS (polydimethylsiloxane) surface

The invention belongs to the technical field of microfluidics, and discloses a liquid self-driving method and device based on a PDMS (Polydimethylsiloxane) surface. The method comprises the following operation steps: preparing an array micro-nano structure on the surface of PDMS to enhance the hydrophobicity of the PDMS; designing a movement path of liquid drops in advance according to functional requirements, and performing infrared laser irradiation in front of the movement path direction of the liquid drops, so that an irradiated area of PDMS absorbs heat and expands, the spacing of micro-nano structures at the position changes, the contact state of the liquid drops in the irradiated area of PDMS also changes, and the difference of contact angles before and after the liquid drops pushes liquid to roll; by moving and changing the irradiation position of the infrared laser on the PDMS surface, guiding liquid drops to move on the channel-free PDMS surface according to a set path without the action of external