Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-24T18:30:17.518Z Has data issue: false hasContentIssue false
  • English
  • Français

Synthesis, characterisation and liquid-crystalline phase transition studies on two higher homologues of 4O.m (m=14 and 16) series

Published online by Cambridge University Press:  15 March 2011

C. Rama Chandra Prabhu  and
V.G.K.M. Pisipati
C. Rama Chandra Prabhu
Affiliation:
Faculty of Physics, RVR & JC College of Engineering, Chandramoulipuram, Chowdavaram, Guntur- 522 019, India
V.G.K.M. Pisipati
Affiliation:
Centre for Liquid Crystals Research and Education, Faculty of Physical Sciences, Nagarjuna University, Nagarjuna Nagar-522 510, India
Get access

Abstract

The synthesis, characterization and phase transition studies of higher homologues of N(p-nbutoxybenzylidene)p-n-alkylanilines, Viz., 4O.m series (m=14 and 16) are carried out by thermal microscopy, differential scanning calorimetry and density. The compounds exhibit a phase variant of nematic and smectic-A. Density studies reveal a first order nature of IN transitions and a weak first order NA transitions. An estimate of pressure dependence of the phase transition temperatures using the volume and enthalpy data are presented. A comparison of these results with other reported results in nO.m and other compounds are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 709: Symposium CC – Advances in Liquid Crystalline Materials and Technologies , 2001 , CC5.33.1
Copyright
Copyright © Materials Research Society 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Singh, S., 2000, Physics Reports, 324, 107.Google Scholar
2. Kelker, H., Scheurle, B., J., Hartz, R., Bartsch, W., 1970, Angew. Chem. 9, 962 Google Scholar
3. Smith, G.W., Garlund, Z.G., 1973, J. Chem. Phys. 59, 3214 Google Scholar
4. Wiegeleben, A., Richter, L., Deresch, J., Demus, D., 1980, Mol. Cryst. Liq. Cryst. 59, 329 Google Scholar
5. Demus, D., Konig, H., Marzotko, D., Rurainski, R., Hauser, A., Latif, I., Salbmann, C., Weissflog, W., 1994, Cryst. Res. Technol. 29, 443 Google Scholar
6. Prabhu, C.R.C., Pisipati, V.G.K.M., 2001, Cryst. Res. Technol. (communicated)Google Scholar
7. Gogoi, B., Arulsankar, A., Alapati, P.R., 2001, Mol. Cryst. Liq. Cryst. (Under publication)Google Scholar
8. Srinivasulu, M., Potukuchi, D. M., Pisipati, V.G.K.M., 1997, Z. Naturforsch. 52a, 713 Google Scholar
9. Potukuchi, D. M., Lakshminarayana, S., Prabhu, C. R., Pisipati, V.G.K.M., 1996, Cryst. Res. Technol. 31, 685 Google Scholar
10. Bhaskara Rao, P., Potukuchi, D. M., Murthy, J. S. R., Rao, N.V.S., Pisipati, V.G.K.M., 1992, Cryst. Res. Technol. 27, 839 Google Scholar
11. Lakshminarayana, S., Prabhu, C. R., Potukuchi, D. M., Rao, N.V.S., Pisipati, V.G.K.M., 1996, Liquid Crystals 20, 177 Google Scholar
12. Sheng, P., Wojtowicj, P. J., 1986, Phys. Rev. A, 14, 1483 Google Scholar
13. Hiltrop, K., 1980, Mol. Cryst. Liq. Cryst. 59, 329 Google Scholar
14. Alapati, P.R., Saran, D, 1991, Phys. Status Solidi B, 168, 39 Google Scholar
15. Potukuchi, D. M., Prabhakar, K., Rao, N.V.S., Pisipati, V.G.K.M., Saran, D., 1989, Mol. Cryst. Liq. Cryst. 167, 181 Google Scholar
16. Rao, N.V.S., Potukuchi, D. M., Pisipati, V.G.K.M., 1991, Mol. Cryst. Liq. Cryst, 196, 71 Google Scholar
17. Rao, N.V.S., Pisipati, V.G.K.M., 1984, J. Phys. Chem. 87, 884 Google Scholar
18. Haller, I., Huggins, H. R, Lilinthal, H.R., Mcguire, T.R., 1973, J. Phys. Chem., 77 950 Google Scholar
19. Rao, N.V.S., Pisipati, V.G.K.M., 1983, J. Phys. Chem., 87, 899 Google Scholar
20. Alapati, P.R., Potukuchi, D.M., Rao, N.V.S., Pisipati, V.G.K.M., 1989, Liquid Crystals 3(1988) 1461 Google Scholar
21. Pisipati, V.G.K.M., Rao, N.V.S., Rao, M.K., Potukuchi, D.M, Alapati, P.R., 1987, Mol. Cryst. Liq. Cryst, 146, 89 Google Scholar
22. Grasso, D., Fasone, S., Dipasquale, G., Costelli, F, 1989, Thermo. Chim. Acta, 140, 31 Google Scholar
23. Rao, N.V.S., Pisipati, V.G.K.M., 1983, Phase. Trans., 3, 317s Google Scholar
23. Rao, N.V.S., Pisipati, V.G.K.M, Sankar, Y. G, and Potukuchi, D. M., 1986, Phase Trans., 7, 49 Google Scholar