Johns Hopkins engineers are using a popular children’s toy to help them visualize the behavior of particles, cells and molecules in environments too small to see with the naked eye. These researchers are arranging little LEGO pieces shaped like pegs to recreate microscopic activity taking place inside lab-on-a-chip devices at a scale they can more easily observe. These lab-on-a-chip devices, also known as microfluidic arrays, are commonly used to sort tiny samples by size, shape or composition, but the minuscule forces at work at such a small magnitude are difficult to measure. To solve this small problem, the Johns Hopkins engineers decided to think big.
Led by Joelle Frechette and German Drazer, both assistant professors of chemical and biomolecular engineering in the Whiting School of Engineering, the team used beads just a few millimeters in diameter, an aquarium filled with goopy glycerol and the LEGO pieces arranged on a LEGO board to unlock mysteries occurring at the micro- or nanoscale level. Their observations could offer clues on how to improve the design and fabrication of lab-on-a-chip technology. Their study concerning this technique was published in the August 14 issue of Physical Review Letters. Both Drazer and Frechette are affiliated faculty members of Johns Hopkins Institute for NanoBioTechnology.
The idea for this project comes from the concept of “dimensional analysis,” in which a process is studied at a different size and time scale while keeping the governing principles the same. [Read more...]