Chromonic phase behaviour based on planar discs functionalized with EO (ethylenoxy) groups

Lead Research Organisation: University of Hull
Department Name: Physical Sciences

Abstract

Chromonics are a fascinating class of lyotropic liquid crystals. They are usually formed in water from plate-like molecules, which self-assemble into aggregate stacks (rods or layers), which in turn self-organise to form liquid crystals.

Chromonics are very poorly understood. Researchers are just beginning to understand how self-assembly is influenced by the interactions between molecules and how the process can be controlled by use of additives (such as small molecules or salt). Moreover, many known chromonic materials are based on industrial dyes, which are very difficult to purify; and this hampered some of the early investigations into phases and phase behaviour.

Despite these difficulties it is beginning to be recognised that chromonic systems are far more common than once thought. Formation of stacked aggregates in dilute solution and/or chromonic mesophases at higher concentrations, have been widely reported in aqueous dispersions of many formulated products such as pharmaceuticals and dyes used in inkjet printing. Recently, there has been greatly enhanced interest in chromonics materials as functional materials for fabricating highly ordered thin films, as biosensors, and chromonic stacks have also been used to aid in the controllable self-assembly of gold nanorods.

This proposal seeks to develop a novel class of chromonic molecules: nonionic chromonics based on ethylenoxy groups. Here, we will design new chromonic phases demonstrating novel structures (such as hollow water-filled columns and layered brick-like phases), which can be used for future applications. We will also investigate and control the self-assembly process, in a class of materials that can be purified, that are not influenced as strongly by salt (compared to most industrial dyes), where structural changes can be easily engineered by minor changes to a synthetic scheme, and where addition of other solvents can lead to major changes in both self assembly and phase behaviour. We will also use state-of-the-art modelling and theory, which has recently been shown to provide new insights into self-assembly in chromonics, to help design new materials. Here, the use of quantitative and semi-quantitative molecular modelling provides for the possibility of "molecular engineering" new phases.

To accomplish our goals for this project we will bring together synthetic organic chemistry to design and make new materials; state-of-the-art physical organic measurements to characterise both the nature of self-assembly and the novel chromonic phases formed; and state-of-the-art modelling/theory to predict, explain and help control the chromonic aggregation.

Publications

10 25 50
 
Description we discovered that non-ionic chromonics show a subtlely different mode of phase assembly when compared to ionic chromoncs, This has potential impact on the users of chromonic systems such as in pharmaceutical industry or in the display industry.
Exploitation Route design of new more complex and advanced systems
Sectors Chemicals,Electronics,Energy,Pharmaceuticals and Medical Biotechnology

 
Description Collaboration with industry on chromonic materials has been initiated
First Year Of Impact 2016
Sector Chemicals,Pharmaceuticals and Medical Biotechnology
Impact Types Economic

 
Description costshare exchange grant
Amount £24,000 (GBP)
Funding ID IE161650 
Organisation The Royal Society 
Sector Academic/University
Country United Kingdom
Start 03/2017 
End 03/2019
 
Description biaxial nematics and chromonics 
Organisation Kent State University
Department Liquid Crystal Institute
Country United States 
Sector Academic/University 
PI Contribution provided materials and structural knowledge
Collaborator Contribution physical investigations
Impact joint papers
Start Year 2006
 
Description chromonics 
Organisation Durham University
Country United Kingdom 
Sector Academic/University 
PI Contribution provided inofrmation on self-assmbly
Collaborator Contribution simulationsof properties and theoretical knowledge
Impact ongoing, papers are in preparation
Start Year 2009
 
Description chromonics 
Organisation University of Manchester
Country United Kingdom 
Sector Academic/University 
PI Contribution provided materials and structural knowledge
Collaborator Contribution theory formation and physical invesitgations
Impact ongoing, papers are in preparation
Start Year 2009