Carbon nanotubes alignment

G.D. Li, Z.K. Tang, N. Wang, and J.S. Chen, Structural Study of the 0.4-nm Single-walled Carbon Nanotubes Aligned in Channels of AlP04-5 Crystal. Carbon, 2002, 40, 917-921. 

Kimura T, Ago H, Tobita M, Ohshima S, Kyotani M, Yumura M (2002) Polymer composites of carbon nanotubes aligned by a magnetic field. Adv Mater 14 1380... 

The thermal conductivity of multiscale composites was increased by incorporation of carbon nanotubes. Aligned MWNTs may significantly enhance the thermal conductivity of the composites. With 1% MWNT incorporation, thermal conductivity is improved by 67%. If more CNTs can be uniformly incorporated into polymer matrix of the fiber composites, more significant enhancement will be achieved. 

Because direct calculation of thermal conductivity is difficulty 1], experimental measurements on composites with nanotubes aligned in the matrix could be a first step for addressing the thermal conductivity of carbon nanotubes. High on-axis thermal conductivities for CCVD high-temperature treated carbon fibers have been obtained, but have not reached the in-plane thermal conductivity of graphite (ref. [3], Fig. 5.11, p. 115). We expect that the radial thermal conductivity in MWNTs will be very low, perhaps even lower than the c-axis thermal conductivity of graphite. 

FIGURE 15.31 A "forest" of carbon nanotubes that grew in vertical alignment in a "bottom-up" fashion. 

Fischer, J. E., Zhou, W., Vavro, J., Llaguno, M. C., Guthy, C HaggenmueDer, R., Casavant, M. J., Walters, D. E. and Smalley R. E. (2003) Magnetically aligned single wall carbon nanotube films Preferred orientation and anisotropic transport properties./. Appl. Phys., 93, 2157-2163. 

Gooding JJ, Wibowo R, Liu JQ, Yang WR, Losic D, Orbons S, Meams FJ, Shapter JG, Hibbert DB. 2003. Protein electrochemistry using aligned carbon nanotube arrays. J Am Chem Soc 125 9006-9007. 

The packing density of the self-assembled, aligned carbon nanotubes can be controlled through the incubation time. 

Lan el al. [52] have reported an approach for vertically aligning multi-wall carbon nanotubes on diverse substrates treated with polyelectrolyte. The shortened multi-wall carbon nanotubes were first functionalized with acyl chloride in thionyl chloride (SOCl2). 

CNT-doped conducting polymers possess improved mechanical, chemical, and optical properties. They also provide a simple strategy for making aligned CNTs. The disappearance of the characteristic peaks of carbon nanotubes in the FTIR spectrum of polymer/CNT composite films is normally an indication of perfect enwrapping of CNTs with the deposited conducting polymer [162, 163], Zhang et al. [40] have studied the... 

J. Liu, A. Chou, W. Rahmat, M.N. Paddon-Row, and J.J. Gooding, Achieving direct electrical connection to glucose oxidase using aligned single walled carbon nanotube arrays. Electroanalysis 17, 38—46 (2005). 

H.H. Gommans, J.W. Alldredge, H. Tashiro, J. Park, J. Magnuson, and A.G. Rinzler, Fibers of aligned single-walled carbon, nanotubes polarized Raman spectroscopy. J. Appl. Phys. 88, 2509—2514 (2000). 

Kang, S. J. Kocabas, C. Ozel, T. Shim, M. Pimparkar, N. Muhammad, M. A. Rotkin, S. V. Rogers, J. A. 2007. Fligh-performance electronics using dense, perfectly aligned arrays of single-walled carbon nanotubes. Nature Nanotechnol. 2 230-236. 

Kocabas, C. et al. 2005. Guided growth of large-scale, horizontally aligned arrays of single-walled carbon nanotubes and their use in thin-film transistors. Small 1 1110-1116. 

Kang, S. J. et al. 2007. High-performance electronics using dense, perfectly aligned arrays of single-walled carbon nanotubes. Nature Nanotechnol. 2 230-236. 

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