Nanoparticles in binary mixture of liquid crystal and dodecanol
- Event time: 1:00pm
- Event date: 10th September 2007
- Speaker: Chethan Lobo (University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Many liquid crystals compounds exhibit the phase sequence Isotropic-Nematic-Smectic-A as the sample is cooled, while some others go over directly to the smectic-A phase from the isotropic liquid. Adding a long chain alcohol suppresses the nematic phase and leads to the formation of a smectic phase via novel kinetics. We study the kinetics of isotropic-Smetic-A phase transition in the binary mixture of liquid crystal with long chain alcohol (our system is Octyloxycyanobiphenyl + dodecanol), the growth of Smectic-A from isotropic phase occurs in the form of long cylindrical structures, which we have already observed under polarising microscope. Attempts have been made to disperse finite concentrations of nanoparticles in liquid crystals which has a great interest from a fundamental and practical standpoint. We have dispersed small amounts of CdSe semiconductor quantum dots into this binary mixture and studied the particle behaviour using fluorescence microscopy. We hope to create a range of novel soft composite materials over the time.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..