2. You are developing PDMS-based (contact angle =110 ) lab-on-a-chip towards point-of-care medical diagnostics of a) whole blood and b) tissue biopsy sample. For each case, identify at least three surface modification methods that will improve the biocompatibility of this lab-ona-chip device. (For your information, a lab-on-a-chip (LOC) is a device that integrates one or several laboratory functions on a single integrated circuit (commonly called a "chip") of only millimeters to a few square centimeters to achieve automation and high-throughput screening.) Here is the hint: a) thrombosis and b) cell fixation