String & sticky tape experiments: Thermal conductivity and liquid crystal thermometers

1993 ◽  
Vol 31 (7) ◽  
pp. 412-413
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Sticky Tape

Thermal conductivity of the nematic liquid crystal 4-n-pentyl-4’-cyanobiphenyl

1994 ◽  
Vol 49 (1) ◽  
pp. 545-553 ◽  
Author(s):  
Guenter Ahlers ◽  
David S. Cannell ◽  
Lars Inge Berge ◽  
Shinichi Sakurai
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal

Electrohydrodynamic Flow in Thick Liquid Crystal Cells

1989 ◽  
Vol 177 ◽  
Author(s):  
David H. Van Winkle ◽  
Jit Gurung ◽  
Rand Biggers
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Thermal Transport ◽  
Room Temperature ◽  
Liquid Crystal Cell ◽  
Optical Observations ◽  
Constant Voltage ◽  
Maximum Enhancement ◽  
Flowing Liquid ◽  
Crystal Cells

ABSTRACTThe thermal transport across a thick (0.66 cm) liquid crystal cell has been measured versus applied ac voltage and frequency. These measurements are correlated with the optically observed onset of flow and turbulence in cells as identical as practicable to those used for the thermal transport measurements. In addition, the measurements are compared with reported observations in thin cells. The thermal transport across the liquid crystal is characterized by an effective thermal conductivity Kf. It was found that Kf increases with increasing frequency, at constant voltage, to a maximum enhancement at about 40 Hz at room temperature. Optical observations on thick cells indicate that dynamic columnar domains of flowing liquid crystal are the primary mode of heat transport, as determined by correlating the structure and characteristic lifetime of such domains as a function of voltage and frequency. Optical observations at low voltages suggest that Williams Domains do not exist in these thick cells, and that all observed responses are functions of electric field strength, not applied voltage (as in thin Williams Domain cells).

Multifunctional Liquid Crystal Polymeric Composites Embedded With Graphene Nano Platelets

2011 ◽  
Author(s):  
Muhammad Omer Khan ◽  
Ellen Chan ◽  
Siu N. Leung ◽  
Hani Naguib ◽  
Francis Dawson ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Heat Dissipation ◽  
Three Dimensional ◽  
Cost Effective ◽  
Polymeric Composites ◽  
Potential Cost ◽  
Conductive Composites ◽  
The Matrix ◽  
Thermally Conductive

This paper studies the development of new multifunctional liquid crystal polymeric composites filled with graphene nano platelets (GNPs) for electronic packaging applications. A series of parametric studies were conducted to study the effect of GNP content on the thermal conductivity of LCP-based nanocomposites. Graphene, ranging from 10 wt. % to 50 wt. %, were melt-compounded with LCP using a twin-screw compounder. The extrudates were ground and compression molded into small disc-shaped specimens. The thermal conductivity of LCP matrix was observed to have increased by more than 1000% where as the electrical conductivity increased by 13 orders of magnitude with the presence of 50 wt% GNP fillers. The morphology of the composites was analyzed using SEM micrographs to observe the dispersion of filler within the matrix. These thermally conductive composites represent potential cost-effective materials to injection mold three-dimensional, net-shape microelectronic enclosures with superior heat dissipation performance.

Thermal conductivity models for carbon/liquid crystal polymer composites

2007 ◽  
Vol 105 (6) ◽  
pp. 3309-3316 ◽  
Author(s):  
Jason M. Keith ◽  
Julia A. King ◽  
Kara M. Lenhart ◽  
Bridget Zimny
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Polymer Composites ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer ◽  
Conductivity Models

Effects of carbon fillers on the thermal conductivity of highly filled liquid-crystal polymer based resins

2008 ◽  
Vol 109 (4) ◽  
pp. 2145-2155 ◽  
Author(s):  
Rebecca A. Hauser ◽  
Julia A. King ◽  
Rachel M. Pagel ◽  
Jason M. Keith
Keyword(s):  
Thermal Conductivity ◽  
Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer ◽  
Carbon Fillers
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