Micro viscometers and methods of manufacturing the same

1. A micro viscometer, comprising:

a first chamber and a second chamber separated from the first chamber;

a micro channel connecting the first chamber to the second chamber;

a first thin film disposed over the first chamber and a second thin film disposed over the second chamber; and

a first piezoelectric film disposed over the first thin film and a second piezoelectric film disposed over the second thin film,

wherein the first and second piezoelectric films have a hexagonal shape if a longest distance between a center and an edge of at least one piezoelectric film is longer than a threshold range and the first and second piezoelectric films have a circular shape if the distance is shorter than the threshold range,

wherein the threshold range is 55 μm-60 μm.

2. The micro viscometer of claim 1 , wherein the viscometer includes a plurality of the micro-channels.

3. The micro viscometer of claim 1 , wherein the first and second piezoelectric films have a hexagonal shape or a circular shape when the distance is within the threshold range.

4. The micro viscometer of claim 1 , wherein the first and second piezoelectric films are formed of an electroactive polymer.

5. The micro viscometer of claim 1 , wherein the threshold range increases or decreases in proportion to a width or thickness of at least one of the piezoelectric films.