| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 탄소나노튜브 및 고분자 복합재료 |
| 제목 | Carbon Nanotubes-adsorbed Polymeric Microspheres |
| 초록 | Carbon nanotubes (CNTs) are among the most exciting new materials since their discovery in 1991.1 Many of their outstanding properties can be best exploited by incorporating CNTs into some form of matrix, and the preparation of CNT-containing composite materials is now a rapidly growing research area.2-6 In may cases, these composites use the polymer matrices. Polymer composites reinforced with CNTs are believed to have many potential engineering uses, ranging from battery electrodes and electronic devices to much stronger composites.2-8 Furthermore, its electrorheological (ER) characteristics have recently been reported, in which a suspension polymerized particle of a CNT nanocomposite with poly(methyl methacrylate) (PMMA) was dispersed in silicone oil.9 ER fluids are mainly suspensions of particles with a higher dielectric constant and/or conductivity than that of the suspending medium fluids with a low dielectric constant and a low viscosity. They exhibit a drastic and reversible change in their rheological characteristics as a result of an applied electric field, because the ER particles are attracted to one another to form fibril structures aligned in the direction of the applied electric field.10,11 In this study, surface-conductive microspheres consisting of polystyrene (PS) (3.0 mm) or PMMA (6.5 mm) core and CNTs-adsorbed shell were prepared using a simple process involving the blending of two colloidal solution; an aqueous CNT dispersion with surfactants and an aqueous PS or PMMA microsphere colloid (Fig. 1).12 These were adopted as the suspended particles for ER fluids, in which the electrical conductivity originated primarily from the surface-coated conducting CNT layers. Fig. 1. Field-emission scanning electron microscopy images of the carbon nanotube-adsorbed polymeric microspheres; (a) PS and (b) PMMA. Acknowledgements We thanks Prof. H. J. Choi (Inha Univ.) and Prof. S. E. Shim (Inha Univ.) for technical input and meaningful discussion. References 1. S. Iijima, Nature, 354, 56 (1991). 2. P. J. F. Harris, International Materials Review, 49, 31 (2004). 3. S. Kumar, T. D. Dang, F. E. Arnold, A. R. Bhattacharyya, B. G. Min, X. F. Zhang, R. A. Vaia, C. Park, W. W. Adams, R. H. Hauge, R. E. Smalley, S. Ramesh, and P. A. Willis, Macromolecules, 35, 9039, (2002). 4. R. H. Baughman, A. A. Zakhidov, and W. A. de Heer, Science, 297, 787 (2002). 5. B. Vigolo, A. Pénicaud, C. Coulon, C. Sauder, R. Pailler, C. Journet, P. Bernier, and P. Poulin, Science, 290, 1331 (2000). 6. C. Y. Wei, D. Srivastava, and K. J. Cho, Nano Letters, 2, 647 (2002). 7. E. Lahiff, C. Y. Ryu, S. Curran, A. I. Minett, W. J. Blau, and P. M. Ajayan, Nano Letters, 3, 1333 (2003). 8. P. M. Ajayan, L. S. Schadler, C. Giannaris, and A. Rubio, Adv. Mater., 12, 750 (2000). 9. S. J. Park, S. T. Lim, M. S. Cho, H. M. Kim, J. Joo, and H. J. Choi, Current Appl. Phys., 5, 302 (2005). 10. T. C. Halsey and W. Toor, Phys. Rev. Lett., 65, 2820 (1990). 11. T. Hao, Adv. Mater., 13, 1847 (2001). 12. H.-J. Jin, H. J. Choi, S. H. Yoon, S. J. Myung, S. E. Shim, Chem. Mater., 17, 4034 (2005). |
| 저자 | 윤석호, 진형준 |
| 소속 | 인하대 |
| 키워드 | carbon nanotube; polymeric microsphere; adsorption; electrical conductivity; electrorheological fulid |
