Dielectrophoresis force driven dynamics of carbon nanotubes in liquid crystal medium

This work reports the translation motion of carbon nanotubes (CNTs) dispersed in nematic liquid crystal (NLC) under an ac electric field. This effect was studied for homogeneously and vertically aligned NLC cells driven by in-plane field and vertical electric field, respectively. Long axis of the CNTs is aligned along the liquid crystal director, and above the critical field, the director of the NLC is distorted due to translation motion of CNTs in NLC. The amplitude of this translation motion decreases with increasing frequency, whereas the critical field increases with increasing frequency. We present the mechanism of translation motion of CNTs and model this observed phenomenon based on dielectrophoretic force.

[1]  Piero Morales,et al.  Aligning and Reorienting Carbon Nanotubes with Nematic Liquid Crystals , 2004 .

[2]  Herbert Shea,et al.  Single- and multi-wall carbon nanotube field-effect transistors , 1998 .

[3]  Thomas Gennett,et al.  Single Wall Carbon Nanotube−Nafion Composite Actuators , 2002 .

[4]  A. Rinzler,et al.  Carbon nanotube actuators , 1999, Science.

[5]  Local deformation of liquid crystal director induced by translational motion of carbon nanotubes under in-plane field , 2006 .

[6]  P. Avouris,et al.  Nanotubes for electronics. , 2000, Scientific American.

[7]  Charles M. Lieber,et al.  Covalently functionalized nanotubes as nanometre- sized probes in chemistry and biology , 1998, Nature.

[8]  P. Bøggild,et al.  Dielectrophoresis of carbon nanotubes using microelectrodes: a numerical study , 2004 .

[9]  S. Tans,et al.  Room-temperature transistor based on a single carbon nanotube , 1998, Nature.

[10]  W. D. de Heer,et al.  A Carbon Nanotube Field-Emission Electron Source , 1995, Science.

[11]  Chang-Soo Han,et al.  Controlled assembly of single SWNTs bundle using dielectrophoresis , 2005 .

[12]  P. McEuen,et al.  Single-walled carbon nanotube electronics , 2002 .

[13]  W. D. de Heer,et al.  Carbon Nanotubes--the Route Toward Applications , 2002, Science.

[14]  R. Ruoff,et al.  Strength and breaking mechanism of multiwalled carbon nanotubes under tensile load , 2000, Science.

[15]  Charles M. Lieber,et al.  Carbon nanotube-based nonvolatile random access memory for molecular computing , 2000, Science.

[16]  Wei-Yu Lee,et al.  Effects of carbon nanosolids on the electro-optical properties of a twisted nematic liquid-crystal host , 2004 .

[17]  Kong,et al.  Nanotube molecular wires as chemical sensors , 2000, Science.

[18]  John A Rogers,et al.  Polymer electrolyte gating of carbon nanotube network transistors. , 2005, Nano letters.

[19]  Young Hee Lee,et al.  Electrical-field effect on carbon nanotubes in a twisted nematic liquid crystal cell , 2005 .

[20]  C. Dekker,et al.  Logic Circuits with Carbon Nanotube Transistors , 2001, Science.

[21]  Michael D. Lynch,et al.  Organizing Carbon Nanotubes with Liquid Crystals , 2002 .

[22]  T. A. Taton,et al.  Homogeneous, Coaxial Liquid Crystal Domain Growth from Carbon Nanotube Seeds , 2003 .

[23]  M. Lundstrom,et al.  Ballistic carbon nanotube field-effect transistors , 2003, Nature.

[24]  T. Chou,et al.  Advances in the science and technology of carbon nanotubes and their composites: a review , 2001 .