At Micronit GmbH, a DLD-chip was developed in silicon and glass. Both silicon and glass are known for their chemical and biological inertness. Besides, both materials can be cleaned from biological deposits, and are therefore very suitable for reusable products. The hybrid combination of silicon and glass makes a sustainable and reliable chip. To test the functionality of the chip, fluorescent microparticles were used.
Sorting by size
DLD is a process that sorts microparticles of different sizes. During the testing phase of the chip, several images were made of the DLD process. Observations show that larger particles follow a different trajectory than smaller particles. Large particles move in line with the row of pillars, thus laterally steering away from the streamline because of the diagonal placement of the pillars. Smaller particles on the other hand, do not divert from the streamline. Instead, they continue to follow the direction of the streamline and therefore change between the rows of pillars.
The following image shows the trajectory of a large particle. You can see how it stays in its row and therefore diverts from the streamline.