Navigation Links
New type of liquid crystal promises to improve performance of digital displays
Date:10/5/2010

Chemists at Vanderbilt University have created a new class of liquid crystals with unique electrical properties that could improve the performance of digital displays used on everything from digital watches to flat panel televisions.

The achievement, which is the result of more than five years of effort, is described by Professor of Chemistry Piotr Kaszynski and graduate student Bryan Ringstrand in a pair of articles published online on Sept. 24 and Sept. 28 in the Journal of Materials Chemistry.

"We have created liquid crystals with an unprecedented electric dipole, more than twice that of existing liquid crystals," saysKaszynski.

Electric dipoles are created in molecules by the separation of positive and negative charges. The stronger the charges and the greater the distance between them, the larger the electric dipole they produce.

In liquid crystals, the electric dipole is associated with the threshold voltage: the minimum voltage at which the liquid crystal operates. Higher dipoles allow lower threshold voltages. In addition, the dipole is a key factor in how fast liquid crystals can switch between bright and dark states. At a given voltage, liquid crystals with higher dipoles switch faster than those with lower dipoles.

Commercial potential

Vanderbilt has applied for a patent on the new class of materials. Some of the companies that manufacture liquid crystals for commercial applications have expressed interest and are currently evaluating it.

"Our liquid crystals have basic properties that make them suitable for practical applications, but they must be tested for durability, lifetime and similar characteristics before they can be used in commercial products," Kaszynski says.

If it passes commercial testing, the new class of liquid crystals will be added to the complex molecular mixtures that are used in liquid crystal displays. These blends combine different types of liquid crystals and other additives that are used to fine-tune their characteristics, including viscosity, temperature range, optical properties, electrical properties and chemical stability. There are dozens of different designs for liquid crystal displays and each requires a slightly different blend.

Scientific significance

The newly discovered liquid crystals are not only important commercially but they are also important scientifically.

Since 1888 when they were discovered, scientists have discovered more than 100,000 natural and synthetic compounds that have a liquid crystal state. They have determined that one of the prerequisites for such a state is that the molecule must be shaped like either a rod or a disc. A second requirement is that it must contain both rigid and flexible parts. It takes a delicate balance of two opposing factors or forces to produce a material halfway between a crystal and a liquid. However, there is still a great deal about this unusual state that scientists do not yet understand.

For example, scientists are still trying to determine the effect that a liquid crystal's electric dipole has on the temperature at which it becomes an ordinary liquid. The current consensus has been that increasing the strength of the dipole typically raises this transition temperature. The way in which the new type of liquid crystals are synthesized allowed Kaszynski and Ringstrand to test this theory by creating pairs of liquid crystals with the same geometry but different electric dipoles and measuring their transition temperatures. They found that subtle structural differences have a much greater effect on the transition temperature than do variations in the strength of the electric dipole.

Unique "zwitterionic" structure

What distinguishes the new class of liquid crystals is its "zwitterionic" structure. Zwitterions are chemical compounds that have a total net electrical charge of zero but contain positively and negatively charged groups. The newly developed liquid crystals contain a zwitterion made up of a negatively charged inorganic portion and a positively charged organic portion. Kaszynski first got the idea of making zwitterionic liquid crystals nearly 17 years ago when he first arrived at Vanderbilt. However, a critical piece of chemistry required to do so was missing. It wasn't until 2002 when German chemists discovered the chemical procedure that made it possible for the Vanderbilt researchers to succeed in this effort.


'/>"/>

Contact: David F. Salisbury
david.salisbury@vanderbilt.edu
615-343-6803
Vanderbilt University
Source:Eurekalert  

Related biology news :

1. LiXEdrom: Innovative measuring chamber for X-ray study of liquid jets
2. UCLA engineer gets $4 million from Department of Energy to convert CO2 to liquid fuel using electricity
3. Small liquid sensor may detect cancer instantly, could lead to home detection kit
4. UCLA researchers engineer bacteria to turn carbon dioxide into liquid fuel
5. NJIT engineer discovers why particles disperse on liquids
6. New technique can fast-track better ionic liquids for biomass pre-treatments
7. Turning sunlight into liquid fuels
8. Good liquid, bad liquid
9. Research exposes the risk to infants from the chemicals used in liquid medicines
10. How do your crystals grow?
11. A crystal ball for predicting the effects of global climate change
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
New type of liquid crystal promises to improve performance of digital displays
(Date:1/22/2016)... 22, 2016 ... of the  "Global Behavioral Biometric Market ... --> http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced ... Biometric Market 2016-2020"  report to their ... Markets ( http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ) has announced the ...
(Date:1/20/2016)... A market that just keeps on growing. Molecular Diagnostics ... genomics knowledge. Learn all about it in this new ... trends are pushing market growth and company valuations. Trends ... pathogen evolution - next generation sequencing - emergence of ... the role of genetic material in Disease and Health ...
(Date:1/18/2016)... JOSE, Calif. , Jan. 18, 2016 /PRNewswire/ ... security software that simplifies the use and access ... technology and go-to-market partnership with American Cyber.  ... Cyber brings extensive experience leading transformational C4ISR and ... implementing and integrating the latest proven technology solutions," ...
Breaking Biology News(10 mins):
(Date:2/11/2016)... 11, 2016  Vermillion, Inc. (NASDAQ: VRML ), ... announced the formation of the Steering Committee for its ... --> Pelvic masses can present physicians and ... Once pregnancy is ruled out, pelvic masses may include ... endometriosis, benign ovarian tumors and gastrointestinal and urinary tract ...
(Date:2/11/2016)... , Feb. 11, 2016  Spectra BioPharma Selling Solutions ... that provides biopharma companies the experience, expertise, operational ... deploy outsourced sales teams. Created in concert with ... both the strategic and tactical needs of its ... solutions through both personal and non-personal promotion. ...
(Date:2/11/2016)... Calif. , Feb. 11, 2016  Dovetail Genomics™ ... to its beta program for a planned metagenomic genome ... present the company,s metagenomic genome assembly method in a ... in Genome Biology & Technology conference in ... of these highly complex datasets is difficult. Using its ...
(Date:2/11/2016)... Buffalo, New York (PRWEB) , ... February 11, ... ... and analytical instruments for more than 150 years, continues today to pursue the ... to its line of analytical instruments: the AR9 Refractometer and the AR5 Refractometer. ...
Breaking Biology Technology: