Dielectric Analysis of Response Time in Electrorheological Fluids Developed for Medical Devices
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Abstract
Three electrorheological fluids (ERFs) of recently synthesized Polyaniline.HCl and Cellulose fluids as well as a commercial product from Fludicon® (Germany), were evaluated with a two-electrode probe unit and by Dielectric Analysis (DEA). The study was a part of an ongoing medical device development project. The dielectric response times were calculated using the critical peak frequency in a corresponding Debye plot of Tan Delta (loss factor/permittivity) vs. log frequency. The DEA revealed the response times (tau, τ) in ms. The Fludicon® ERF was DEA durable (repeat cycles produced same results) and the τ was temperature dependent: 16 ms at 25°C and 0.16 ms at 80°C. The Cellulose ERF was somewhat DEA durable and the τ was 5.5 ms at 25°C and 0.21 ms at 80°C. The response times were logarithmic with the temperature (°C) with a correlation coefficient of >0.98 for the Cellulose and Fludicon® ERFs. The Polyaniline ERF had a τ of 53 ms at 25°C in the 1<sup>st</sup> DEA run and there was no indication of a τ for the remaining DEA tests.
- J. Wei, L. Zhao, S. Peng, J. Shi, Z. Liu and W. Wen, “Wettability of Urea-Doped TiO2 Nanoparticles and Their High Electrorheological Effects,” Journal of Sol-Gel Science and Technology, Vol. 47, No. 3, 2008, pp. 311-315. doi:10.1007/s10971-008-1787-z
- T. Tilki, M. Yavuz, C. Karabacak, M. Cabuk and M. Ulutuerk, “Investigation of Electrorheological Properties of Biodegradable Modified Cellulose/Corn Oil Suspensions,” Carbohydrate Research, Vol. 345, No. 5, 2010, pp. 672-679. doi:10.1016/j.carres.2009.12.025
- D. P. Park, J. Y. Hwang, H. J. Choi, C. A. Kim and M. S. Jhon, “Synthesis and Characterization of Polysaccharide Phosphates Based Electrorheological Fluids,” Materials Research Innovations, Vol. 7, No. 3, 2003, pp. 161-166. doi:10.1007/s10019-003-0242-6
- J. Yin, X. Zhao, X. Xia, L. Xiang and Y. Qiao, “Electrorheological Fluids Based on Nano-Fibrous Polyaniline,” Polymer, Vol. 49, No. 20, 2008, pp. 4413-4419. doi:10.1016/j.polymer.2008.08.009
- Y. Liu and P. P. Phule, “Structure Formation in Novel Electrorheological (ER) Fluids Based on Ultrafine Particles of Electronic Ceramics,” Polymer Preprints (Ame- rican Chemical Society, Division of Polymer Chemistry), Vol. 35, No. 2, 1994, pp. 347-348.
- D. Kittipoomwong, D. J. Klingenberg, Y. M. Shkel, J. F. Morris and J. C. Ulicny. “Transient Behavior of Electrorheological Fluids in Shear Flow,” Journal of Rheology, Vol. 52, No. 1, 2008, pp. 225-241. doi:10.1122/1.2794803
- W. M. Winslow, “Induced Fibrillation of Suspensions,” Journal of Applied Physics, Vol. 20, No. 12, 1949, pp. 1137-1140. doi:10.1063/1.1698285
- Z. P. Shulman, R. Gorodkin, E. Korobko and V. Gleb. “The Electrorheological Effect and Its Possible Uses,” Journal of Non-Newtonian Fluid Mechanics, Vol. 8, No. 1-2, 1981, pp. 29-41. doi:10.1016/0377-0257(81)80003-1
- J. P. Coulter, K. D. Weiss and J. D. Carlson, “Engineering Applications of Electrorheological Materials,” Journal of Intelligent Material Systems and Structures, Vol. 4, No. 2, 1993, pp. 248-259. doi:10.1177/1045389X9300400215
- J. W. Pialet and K. O. Havelka. “Electrorheological Tech- nology: The Future is Now,” Chemtech, Vol. 26, 1996, pp. 3645-3653.
- C. F. Zukoski, “Material Properties and the Electrorheological Response,” Annual Review of Materials Science, Vol. 23, 1993, pp. 45-78. doi:10.1146/annurev.ms.23.080193.000401
- A. T. Riga and L. Judovits, “Material Characterization by Dynamic and Modulated Thermal Analytical Techniques,” ASTM Special Technical Publication, USA, 2001.