Femtosecond laser-patterned slippery surfaces on PET for liquid patterning and blood resistance

Patterned slippery liquid infused porous surfaces (SLIPSes) are highly desirable for their potential applications in biofouling, biomolecule collection, droplet microarrays, and microfluidics. Here, an environmental friendly method to fabricate patterned SLIPS by femtosecond laser processing was reported. This simple method includes three steps, femtosecond laser selective ablation, fluoroalkyl silanes modification, and lubricant infusion. The as-prepared SLIPSes possess excellent repellent property to water and even blood. Benefiting from selective laser ablation, plenty kinds of patterned SLIPSes were prepared, such as rhomb shape, circle shape, triangle shape, leaf shape and pentacle shape. Various kinds of liquids such as blood, yogurt, ink and coffee can be self-patterned after they flowed through the patterned SLIPS. Spatially arrangement of these liquid were realized on the patterned SLIPS. The prepared SLIPS owns an excellent durability and reusability. Patterned micro-reaction of different pH indicators with nitric acid and ammonium hydroxide was realized on the patterned SLIPS. The patterned SLIPS carries significant meanings to field of biological and chemical analysis.