What is chromogenic material?

What is chromogenic material?

Chromic Materials are materials that change colour when they are subjected to an external influence. There are many different types of chromism that are named after the type of external condition that causes them to change colour and most of them are reversible.

What are Chromoactive materials?

Chromoactive materials. This group of smart materials is characterized by its ability to change color when faced with an external stimulus.

What is an example of a smart material?

Examples include colour-changing novelty mugs, colour-changing spoons, battery power indicators and forehead thermometers.

What are thermochromic materials?

Thermochromic materials change reversibly their color by a temperature change. Thermochromic materials are generally organic leuco-dye mixtures, composed by the color former, the color developer, and the solvent. The color former is usually a cyclic ester and determines the base color.

How do we classify smart materials?

Smart materials are classified into two categories either active or passive. On the other part, the materials, which are not active, are called passive smart materials. Although smart, they lack the inherent capability to transduce energy. Fiber optic material is a good example of a passive smart material.

What are smart metals?

A smart metal, or memory shape alloy, is an alloy that returns to its cold forged shape after the application of high heat. They have a range of uses in aerospace, surgery, dentistry, piping, robotics and medicine.

What is the difference between smart and modern materials?

Smart materials are ‘reactive materials’. Their properties can be changed by exposure to stimuli, such as electric and magnetic fields, stress, moisture and temperature. Modern materials are developed through the invention of new or improved processes, for example as a result of manmade materials/ingredients.

Is thermochromic a smart material?

OPTICAL MATERIALS | Smart Optical Materials Thermochromic products are used to darken windows of automobiles, for example, when the internal temperature gets above a specific value.

What is meant by thermochromic?

1 Definitions of thermochromism. Thermochromism is the reversible change in the colour of a compound when it is heated or cooled. The thermochromic colour change is distinguished by being quite noticeable, often dramatic and occurring over a small or sharp temperature interval.

What are chromogenic materials and how they work?

Chromogenic materials are a family of materials that change their color in response to some stimulus. In thermochromic and electrochromic materials the stimuli are temperature and electric field, respectively [ 59 ]. Thermochromic smart materials could reversibly vary colors and optical properties in response to a temperature change.

What are the stimuli in thermochromic materials?

In thermochromic and electrochromic materials the stimuli are temperature and electric field, respectively [ 59 ]. Thermochromic smart materials could reversibly vary colors and optical properties in response to a temperature change.

What are smart materials and nanotechnology?

Smart materials are defined as materials with properties engineered to change in a controlled manner under the influence of external stimuli. These external influences can include temperature, force, moisture, electric charge, magnetic fields and pH. Nanotechnology is rapidly entering the world of smart materials and taking them to the next level.

What are halochromic and chromogenic paints?

Halochromic materials are commonly used materials that change their color as a result of changing acidity. One suggested application is for paints that can change color to indicate corrosion in the metal underneath them. Chromogenic systems change color in response to electrical, optical or thermal changes.

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