Music, rather than electromechanical valves, can drive experimental samples through a lab-on-a-chip in a new system developed at U-M. This development could significantly simplify the process of conducting experiments in microfluidic devices.
A paper on the research was published online last week in the Proceedings of the National Academy of Sciences.
A lab-on-a-chip, or microfluidic device, integrates multiple laboratory functions onto one chip just millimeters or centimeters in size. The devices allow researchers to experiment on tiny sample sizes, and also to simultaneously perform multiple experiments on the same material. There is hope that they could lead to instant home tests for illnesses, food contaminants and toxic gases, among other advances.
To do an experiment in a microfluidic device today, researchers often use dozens of air hoses, valves and electrical connections between the chip and a computer to move, mix and split pin-prick drops of fluid in the device’s microscopic channels and divots.
“You quickly lose the advantage of a small microfluidic system,” says Mark Burns, professor and chair of the Department of Chemical Engineering and a professor in the Department of Biomedical Engineering.
“You’d really like to see something the size of an iPhone that you could sneeze onto and it would tell you if you have the flu. What hasn’t been developed for such a small system is the pneumatics — the mechanisms for moving chemicals and samples around on the device.”
The U-M researchers use sound waves to drive a unique pneumatic system that does not require electromechanical valves. Instead, musical notes produce the air pressure to control droplets in the device. The U-M system requires only one “off-chip” connection.
“This system is a lot like fiberoptics, or cable television. Nobody’s dragging 200 separate wires all over your house to power all those channels,” Burns says. “There’s one cable signal that gets decoded.”
The system developed by Burns, chemical engineering doctoral student Sean Langelier, and their collaborators replaces these air hoses, valves and electrical connections with what are called resonance cavities. The resonance cavities are tubes of specific lengths that amplify particular musical notes.
These cavities are connected on one end to channels in the microfluidic device, and on the other end to a speaker, which is connected to a computer. The computer generates the notes, or chords. The resonance cavities amplify those notes and the sound waves push air through a hole in the resonance cavity to their assigned channel. The air then nudges the droplets in the microfluidic device along.
Burns describes the set-up as the reverse of a bell choir. Rather than ringing a bell to create sound waves in the air, which are heard as music, this system uses music to create sound waves in the device, which in turn, move the experimental droplets.
“I think this is a very clever system,” Burns says. “It’s a way to make the connections between the microfluidic world and the real world much simpler.”
