NMR of Demixing and Phase Separation in Liquid Crystals

author: Boštjan Zalar, Odsek za fiziko trdne snovi, Institut "Jožef Stefan"
published: Aug. 5, 2010,   recorded: July 2010,   views: 3614


Related Open Educational Resources

Related content

Report a problem or upload files

If you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
Lecture popularity: You need to login to cast your vote.


Demixing is a well-known phenomenon present in multi-component liquids and polymer blends, conventionally modeled by the Flory-Huggins free energy approach. In liquid crystals, it can result in a wide coexistence range of nematic and isotropic phases [1]. Determination of the respective temperature-concentration phase diagram is often a rather tedious task, due to many varying parameters: the relative volumes of the phases, the nematic order parameters of the individual mesogens in the nematic phase, as well as the concentrations of components in the nematic and isotropic phases. We demonstrate that deuteron NMR is a particularly useful experimental tool for the study of molecular segregation in nematics, providing for a simultaneous measurement of all the above parameters, both in bulk and confined systems, e.g. in liquid crystalline microemulsions, in doped liquid single-crystal elastomers, and in photoisomerizable nematics.

See Also:

Download slides icon Download slides: clc2010_zalar_dpsls_01.pdf (3.6 MB)

Download slides icon Download slides: clc2010_zalar_dpsls_01.ppt (12.5 MB)

Help icon Streaming Video Help

Link this page

Would you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !

Write your own review or comment:

make sure you have javascript enabled or clear this field: