Self-organisation through size-exclusion in soft materials

Richard J. Mandle*, Edward J. Davis, Constantin-Christian A. Voll, Daniel J. Lewis, Stephen J. Cowling, John W. Goodby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A number of materials derived from 4-undecyloxy-4′-cyanobiphenyl but with varying terminal groups were prepared in order to better understand how such a group influences the type, and local structure of mesophases formed. Whereas electron poor terminal groups (fluoroaromatics and halogen atoms) were found to destabilise the smectic A phase through unfavourable electrostatic interactions, bulky silane, siloxane and hydrocarbon groups can be incorporated into the structure of the phase with only minor reductions in clearing point. An increase in the layer spacing of the smectic Ad phase in materials with bulky groups suggests that microphase segregation is not the driving force, but rather exists as a consequence of steric crowding at the smectic layer interface. Electrooptic studies reveal that 'carbosilane' end groups, such as tetramethyldisilapropane, are significantly more electrochemical stable than their siloxane counterparts whilst retaining their desirable thermal properties.

Original languageEnglish
Pages (from-to)2380-2388
Number of pages9
JournalJournal of Materials Chemistry C
Issue number10
Early online date23 Jan 2015
Publication statusPublished - 14 Mar 2015

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