1. Tube-to-Chip soldering Georg Nüßle

2. µcool weeklyNovember 8, 20122 Paper Following the recipe from: “Solder-based chip-to-tube and chip-to-chip packaging for microfluidic devices” Edward R. Murphy et al., The Royal Society of Chemistry, 2007

3. µcool weeklyNovember 8, 20123 Soldering to PCB Tube 1/16” stainless steel, Swagelok ferrule: big part stainless steel, small part brass Was successful, no solder around at the tube

4. µcool weeklyNovember 8, 20124 Soldering to Chip with Goldlayer Chip: 100µm Si with 20nm Ti and 200nm Au Was successful too Reinforcement for pressure test, chip was glued on thick Si piece

5. µcool weeklyNovember 8, 20125 Pressure Test NanoPort/steel tube combination failed at 78 bar Test object was ejected, which led to a brake off of the Si chip from the reinforcement Si part under the the soldering seemed to be intact Second pressure test, Si chip breaks at 37 bar, solder is unharmed, no solder in tube

6. µcool weeklyNovember 8, 20126 Outlook Test soldering with microfluidic device and prove that the tube is not blocked by solder.