Browse > Article
http://dx.doi.org/10.3740/MRSK.2013.23.1.013

Control of Particle Alignment in an Aqueous Colloidal System by an AC Electric Field  

Hwang, Yeon (Department of Materials Science & Engineering, Seoul National University of Science & Technology)
Publication Information
Korean Journal of Materials Research / v.23, no.1, 2013 , pp. 13-17 More about this Journal
Abstract
The alignments of polystyrene particles of $1{\mu}m$ and $5{\mu}m$ sizes in an aqueous colloidal system were observed by varying the electric field strength, the frequency and the water flow. Spherical mono-dispersed polystyrene particles dispersed in pure water were put into a perfusion chamber; an AC electric field was applied to the Au/Cr electrodes with a 4 mm gap on the glass substrate. The mixture of the $1{\mu}m$ and $5{\mu}m$ sized polystyrene particles at 0.5 vol% concentrations for each size was set in the dielectrophoresis conditions of 1 kHz and 150 V/cm. Large particles of $5{\mu}m$ size were aligned to form chains as the result of the dielectrophoresis force interaction. On the contrary, small particles of $1{\mu}m$ size did not form chains because the dielectrophoresis force was not sufficiently large. When the electric field increased to 250 V/cm, small particles were able to form chains. After the chains were formed from both large and small particles, they began to coalescence as time passed. Owing to the electroosmotic flow of water, wave patterns along the perpendicular direction of the applied electric field appeared at the conditions of 200 Hz and 50 V/cm, when the dielectrophoresis force was small. This wave pattern also appeared for small particles at 1 kHz and 150 V/cm conditions due to the flow of solvent when water was forced to circulate.
Keywords
colloidal particle; aqueous sol; dielectrophoresis; electroosmosis;
Citations & Related Records
연도 인용수 순위
  • Reference
1 H. Morgan and N. G. Green, AC Electrokinetics: colloids and nanoparticles, p. 1-14, Research Studies Press Ltd., Baldock, England (2003).
2 P. C. H. Li, Microfuidic Lab-on-a-Chip for Chemical and Biological Analysis and Discovery, p. 277-280, Taylor & Francis, Boca Raton, USA (2006).
3 P. Tabeling, Introduction to Microfluidics, p. 211-214, Oxford University Press, Oxford, UK (2005).
4 E. Delamarche, D. Juncker and H. Schmid, Adv. Mater., 17, 2911 (2005).   DOI   ScienceOn
5 E. Chmela, R. Tijssen, M. T. Blom, H. J. G. E. Gardeniers and A. van den Berg, Anal. Chem., 74, 3470 (2002).   DOI   ScienceOn
6 B. S. Broyles, S. C. Jacobson and J. M. Ramsey, Anal. Chem., 75, 2761 (2003).   DOI   ScienceOn
7 G. Chirica, J. Lachmann and J. Chan, Anal. Chem., 78, 5362 (2006).   DOI   ScienceOn
8 H. A. Pohl, Dielectrophoresis, p. 6-18, Cambridge Univ. Press, Cambridge, UK (1978).
9 S. I. Khondaker, Z. Yao, L. Cheng, J. C. Henderson, Y. Yao and J. M. Tour, Appl. Phys. Lett., 85, 645 (2004).   DOI   ScienceOn
10 I. Amlani, A. M. Rawlett, L. A. Nagahara and R. K. Tsui, J. Vac. Sci. Technol., B, 20, 2802 (2002).   DOI   ScienceOn
11 M. Trau, D. A. Saville and I. A. Aksay, Langmuir, 13, 6375 (1997).   DOI   ScienceOn
12 L. Bernard, M. Calame, S. J. V. D. Molen, J. Liao and C. Schonenberger, Nanotechnology, 18, 235202 (2007).   DOI   ScienceOn
13 S. O. Lumsdon and D. M. Scott, Langmuir, 21, 4874 (2005).   DOI   ScienceOn
14 R. Pethig, Y. Huang, X. B. Wang and J. P. H. Burt, J. Phys. D: Appl. Phys., 25, 881 (1992).   DOI   ScienceOn
15 P. C. Hiemenz and R. Rajagopalan, Principles of Colloid and Surface Chemistry, 3rd ed., p. 534, Marcel Dekker, Inc., NY, USA (1997).
16 M. Abe, A. Yamamoto, M. Orita, T. Ohkubo, H. Sakai and N. Momozawa, Langmuir, 20, 7021 (2004).   DOI   ScienceOn