▎ 摘　　要

NOVELTY - A graphene-polyorganosiloxane composite material contains uniformly dispersed graphene on polyorganosiloxane matrix in which mass ratio graphene:polyorganosiloxane matrix is 0.0001-0.1:1, graphene is modified with lipophilic group or derivative, and polyorganosiloxane matrix is polydimethyl silicone or derivative. USE - Graphene-polyorganosiloxane composite material for microfluidic chip used for optical heating platform (all claimed). ADVANTAGE - Composite material has improved mechanical, thermal, and electrical properties and uniform and stable performance, and can be processed into any desired shape, preparation method is simple and low in cost, and microfluidic chip prepared from composite material is suitable for wide spectral range and has fast and efficient heating effect, excellent performance, low application cost, and good stability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of graphene-polyorganosiloxane composite material which involves placing solid graphene oxide in N,N-dimethylformamide, ultrasonically dispersing to obtain uniform dispersion, adding fatty amine, ultrasonically dispersing until completely dissolved, transferring in reaction container, completely reacting at 80-140 degrees C, centrifugally washing reaction product using ethanol, vacuum drying to obtain lipophilic group-modified graphene, placing in organosiloxane precursor, stirring, uniformly mixing, adding organosiloxane crosslinking agent, continuously stirring to obtain precursor system, standing, and heat curing at 60-90 degrees C; and (2) application of graphene-polyorganosiloxane composite material for microfluidic chip. DESCRIPTION OF DRAWING(S) - The drawing shows a heating performance comparison chart of microfluidic chip fluid temperature over time. (Drawing includes non-English language text).