Effect of angular rate on nanoparticle-doped liquid crystal

W.-P. Shih, P.-C. Huang
National Taiwan University, TW

Keywords: gyroscope, liquid crystal, nanoparticles

Summary:

As a result of the nanoparticles’ inertia, when subjected to an angular velocity ω, centrifugal force occurred. Once the centrifugal force of the nanoparticles overcomes the attractive force (viscosity term and elastic term) between the liquid crystals (LC), the nanoparticles experience a displacement, in the direction tangent to the angular velocity. Nearby crystals’ stacking structure is disturbed by the nanoparticles movement through the high-viscosity liquid crystals, and the dielectric constant of the liquid crystal cell changes as a result. So, we wish to study the altered angular response of the nanoparticles-LC hybrid material and discuss its possibilities in the development of a cheap and reliable gyroscope which is easy to fabricate. In our research, the normalized values, capacitance divided by max capacitance, for the carbon nanotube-liquid crystal hybrid meterial spinning at 1400 RPM are 0.994, 0.977, and 0.872 at 0℃,28℃,and 55℃, respectively. The threshold angular velocity of CNT-LC and Fe2O3-LC hybrid material at room temperature are 1200 RPM and 700 RPM. We found that gyroscope of nanoparticles dispersed liquid crystal with higher working temperature and nanoparticles’ density provided higher sensitivity. The obtained results are important for the continuous improvement of the gyroscope.