Skip to main content Accessibility help
×
Home

π-π Stacking Molecular Interactions Between Carbon Nanotubes and 5CB Liquid Crystal

Published online by Cambridge University Press:  28 March 2011

Georgi Y. Georgiev
Affiliation:
Department of Natural Sciences, Assumption College, Worcester, MA 01609, U.S.A. Department of Physics and Astronomy, Tufts University, Medford, MA 02155, U.S.A.
Erin A. Gombos
Affiliation:
Department of Natural Sciences, Assumption College, Worcester, MA 01609, U.S.A.
Michael B. McIntyre
Affiliation:
Department of Natural Sciences, Assumption College, Worcester, MA 01609, U.S.A.
Peggy Cebe
Affiliation:
Department of Physics and Astronomy, Tufts University, Medford, MA 02155, U.S.A.
Get access

Abstract

Multiwall Carbon Nanotubes (MWCNT) align by coupling to the liquid crystals’ (LC) nematic director in LC/MWCNT dispersions. This coupling is so strong that the LC molecules act as molecular motors to reorient the MWCNTs when an electric field is applied across oriented electro optic cells. On the other hand, MWCNTs also improve the LC order and modify the crystal phase of LCs. We investigate the physical reasons for those strong effects by studying the molecular interactions between a host LC and MWCNTs. It has been predicted theoretically that the aromatic rings could stack with their π orbitals in 4-Cyano-4’-pentylbiphenyl (5CB) and MWCNT nanocomposites. Experimentally 5CB modifies the MWCNTs Raman breathing modes in the same nanocomposites. In turn, we look for evidence of this interaction between MWCNTs and LCs at the 5CB molecules. Using FTIR spectroscopy we found that the modes corresponding to 5CB aromatic rings vibrations are affected in the presence of MWCNTs which confirms that π-π stacking of 5CB’s biphenyl rigid core to the carbon rings on the MWCNTs’ surface may indeed be major mechanism for MWCNT/LC nematic coupling. It shows also that the Raman breathing mode effects on MWCNTs can be due to this π-π stacking interaction with 5CB. Further investigations of the MWCNTs interactions with 5CB can lead to developing of a complete model of this phenomenon and help applications for electro optic cells, nanoswitches, new crystal forms for optics, communication technology and others.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

Access options

Get access to the full version of this content by using one of the access options below.

References

1. Scalia, G., Lagerwall, J. P. F., Haluska, M., Dettlaff-Weglikowska, U., Giesselmann, F. and Roth, S., Phys. Status Solidi B, 243(13), 32383241 (2006).CrossRefGoogle Scholar
2. Gwizdała, W., Górny, K., Gburski, Z., Journal of Molecular Structure 887 148151 (2008).CrossRefGoogle Scholar
3. Dierking, I., Scalia, G. and Morales, P., J. Appl. Phys. 92, 8 (2004).Google Scholar
4. Georgiev, G., Gombos, E. A., McIntyre, M., Mattera, M., Gati, P., Cabrera, Y. and Cebe, P., in Nanoscale Pattern Formation, edited by Chason, E., Cuerno, R., Gray, J., Heinig, K.-H., (Mater. Res. Soc. Symp. Proc. 1228E, Warrendale, PA, 2010), KK1181.Google Scholar
5. Georgiev, G., McIntyre, M., Gombos, E. A., and Cebe, P., submitted to Liquid Crystal Materials - Beyond Displays (Mater. Res. Soc. Symp. Proc. Fall 2010 meeting in Boston, MA), ID: 900325. L 9.6.Google Scholar
6. Eletskii, A., Physics - Uspekhi 50(3) 225261 (2007).CrossRefGoogle Scholar
7. Lagerwall, J., and Scalia, G., Journal of Material Chemistry 18, 28902898 (2008).CrossRefGoogle Scholar
8. Rahman, M., Lee, W., J. Phys Appl. Phys. 42, 063001 (2009).CrossRefGoogle Scholar
9. Basu, R., Sigdel, K. and Iannacchione, G., arXiv:0905.2779 (2009).Google Scholar
10. Georgiev, G., Cabrera, Y., Wielgus, L., Iftikhar, Z., Mattera, M., Gati, P., Potter, A. and Cebe, P., in Artificially Induced Grain Alignment in Thin Films, edited by Matias, V., Hammond, R., Moon, S.-H., Hühne, R. (Mater. Res. Soc. Symp. Proc. 1150, Warrendale, PA, 2009), RR04-16, p. 185190.Google Scholar
11. Bellamy, L. J., The Infrared Spectra of Complex Molecules, 3rd ed., (Springer, 1975).CrossRefGoogle Scholar
12. Georgiev, G., Judith, R., McIntyre, M., Gombos, E. A., and Cebe, P., submitted to Symposium DD: Artificially Induced Crystalline Alignment in Thin Films and Nanostructures (Mater. Res. Soc. Symp. Proc. Fall 2010 meeting in Boston, MA), ID: 913554. DD 7.9.Google Scholar
13. Dawid, A., Gwizdała, W., Journal of Non-Crystalline Solids 355 13021306 (2009).CrossRefGoogle Scholar

Full text views

Full text views reflects PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.

Total number of HTML views: 0
Total number of PDF views: 13 *
View data table for this chart

* Views captured on Cambridge Core between September 2016 - 24th January 2021. This data will be updated every 24 hours.

Hostname: page-component-76cb886bbf-2crfx Total loading time: 0.303 Render date: 2021-01-24T03:54:07.573Z Query parameters: { "hasAccess": "0", "openAccess": "0", "isLogged": "0", "lang": "en" } Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": false, "newCiteModal": false }

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

π-π Stacking Molecular Interactions Between Carbon Nanotubes and 5CB Liquid Crystal
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

π-π Stacking Molecular Interactions Between Carbon Nanotubes and 5CB Liquid Crystal
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

π-π Stacking Molecular Interactions Between Carbon Nanotubes and 5CB Liquid Crystal
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *