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Rescooped by grzelinski from liquid crystal
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Limits of Liquid Crystals

http://www2.cnrs.fr/en/576.htm


Via grzelinski
grzelinski's insight:

The limits:

The principal limits of this material is that the cholesteric liquid crystals never reflect more than 50% of ambient light; so CNRS researchers try to discovered a way to push this limit up to 80%.

For example, the liquid cristal displays’ main weakness is directivity. Indeed, by moving further away the screen’s axe, the color changes considerably, the contrast and the brightness decreases so the image obtained is faded.

 

more...
grzelinski's curator insight, December 19, 2013 3:37 PM

Définition :

In 1888, the Austrian botanist Friedrich Reinitzer and Rudolf Virchow studied cholesterol derivatives and repeat the experiments of Lehmann about polarized light. They identified a new phase : liquid crystal.

First of all, the liquid crystal state is a distinct phase of matter observed between the crystalline (solid) and isotropic (liquid) states. But it is sometimes difficult to determine whether a material is in a crystal or liquid crystal state. Liquid crystal materials generally have several characteristics. They are a rod-like molecular structure, rigidness of the long axis, and strong dipoles and/or easily polarizable substituents.

There are many types of liquid crystal states, depending upon the amount of order in the material. There are : the nematic phases, the smectic state, cholesteric phases and colummar phases.

 

grzelinski's curator insight, December 19, 2013 3:37 PM

The applications:

Liquid cristals have many uses. In science, device technology, engineering and many other areas, liquid cristals had an important effect.

First of all, the most known application of that technology is liquid cristal displays or LCDs but the most important application has been developed in the fields medecine or electronics. Indeed, it allows to mesure precisely the temperature for physical problems like tumors for example. Another application of liquid cristal is in optical imaging and recording : it is a really promising area but it is not developed enough for the moment.

Applications for this material are discovered every days and continue to provide solutions to many problems, it will be more and more important in scientific and industrial application.

Scooped by grzelinski
Scoop.it!

Applications of Liquid Crystals

http://www.colorchange.com/liquidcrystals

grzelinski's insight:

The applications:

Liquid cristals have many uses. In science, device technology, engineering and many other areas, liquid cristals had an important effect.

First of all, the most known application of that technology is liquid cristal displays or LCDs but the most important application has been developed in the fields medecine or electronics. Indeed, it allows to mesure precisely the temperature for physical problems like tumors for example. Another application of liquid cristal is in optical imaging and recording : it is a really promising area but it is not developed enough for the moment.

Applications for this material are discovered every days and continue to provide solutions to many problems, it will be more and more important in scientific and industrial application.

more...
grzelinski's curator insight, December 19, 2013 3:37 PM

Définition :

In 1888, the Austrian botanist Friedrich Reinitzer and Rudolf Virchow studied cholesterol derivatives and repeat the experiments of Lehmann about polarized light. They identified a new phase : liquid crystal.

First of all, the liquid crystal state is a distinct phase of matter observed between the crystalline (solid) and isotropic (liquid) states. But it is sometimes difficult to determine whether a material is in a crystal or liquid crystal state. Liquid crystal materials generally have several characteristics. They are a rod-like molecular structure, rigidness of the long axis, and strong dipoles and/or easily polarizable substituents.

There are many types of liquid crystal states, depending upon the amount of order in the material. There are : the nematic phases, the smectic state, cholesteric phases and colummar phases.

 

grzelinski's curator insight, December 19, 2013 3:37 PM

The limits:

The principal limits of this material is that the cholesteric liquid crystals never reflect more than 50% of ambient light; so CNRS researchers try to discovered a way to push this limit up to 80%.

For example, the liquid cristal displays’ main weakness is directivity. Indeed, by moving further away the screen’s axe, the color changes considerably, the contrast and the brightness decreases so the image obtained is faded.

 

Rescooped by grzelinski from liquid crystal
Scoop.it!

Definition of Liquid Crystals

http://plc.cwru.edu/tutorial/enhanced/files/lc/phase/..%5Cintro.htm

grzelinski's insight:

Définition :

In 1888, the Austrian botanist Friedrich Reinitzer and Rudolf Virchow studied cholesterol derivatives and repeat the experiments of Lehmann about polarized light. They identified a new phase : liquid crystal.

First of all, the liquid crystal state is a distinct phase of matter observed between the crystalline (solid) and isotropic (liquid) states. But it is sometimes difficult to determine whether a material is in a crystal or liquid crystal state. Liquid crystal materials generally have several characteristics. They are a rod-like molecular structure, rigidness of the long axis, and strong dipoles and/or easily polarizable substituents.

There are many types of liquid crystal states, depending upon the amount of order in the material. There are : the nematic phases, the smectic state, cholesteric phases and colummar phases.

 

more...
grzelinski's curator insight, December 19, 2013 3:37 PM

The applications:

Liquid cristals have many uses. In science, device technology, engineering and many other areas, liquid cristals had an important effect.

First of all, the most known application of that technology is liquid cristal displays or LCDs but the most important application has been developed in the fields medecine or electronics. Indeed, it allows to mesure precisely the temperature for physical problems like tumors for example. Another application of liquid cristal is in optical imaging and recording : it is a really promising area but it is not developed enough for the moment.

Applications for this material are discovered every days and continue to provide solutions to many problems, it will be more and more important in scientific and industrial application.

grzelinski's curator insight, December 19, 2013 3:37 PM

The limits:

The principal limits of this material is that the cholesteric liquid crystals never reflect more than 50% of ambient light; so CNRS researchers try to discovered a way to push this limit up to 80%.

For example, the liquid cristal displays’ main weakness is directivity. Indeed, by moving further away the screen’s axe, the color changes considerably, the contrast and the brightness decreases so the image obtained is faded.