Smart Materials: Thermochromic Liquid Crystals and Leuco Dyes

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Questions and Answers

What is the primary difference between Leuco Dyes and Liquid Crystals in terms of precision?

  • Leuco Dyes are more expensive than Liquid Crystals
  • Leuco Dyes are less precise than Liquid Crystals (correct)
  • Leuco Dyes are more precise than Liquid Crystals
  • Leuco Dyes are more widely used than Liquid Crystals

What is the primary use of Cold-activated thermochromic ink?

  • To create a colour change when heated
  • To reveal an image or another colour printed beneath
  • To alert users to potential safety hazards
  • To create a colour change when cooled (correct)

What is the characteristic of Leuco Dyes that allows them to change colour back and forth?

  • They are irreversible
  • They are reversible (correct)
  • They are colour-specific
  • They are temperature-independent

What is the main application of High-temperature thermochromic ink?

<p>To alert users to potential safety hazards (D)</p> Signup and view all the answers

What is the primary use of Touch-activated thermochromic ink?

<p>To reveal an image or another colour printed beneath (B)</p> Signup and view all the answers

In what forms are Leuco Dyes products available?

<p>In a wide variety of colours, temperatures and forms (C)</p> Signup and view all the answers

What type of inks are temperature-sensitive compounds that temporarily change colour with exposure to heat?

<p>Thermochromic inks (A)</p> Signup and view all the answers

What is the temperature range of the SFXC LC product?

<p>24°C to 29°C (B)</p> Signup and view all the answers

What is the typical application of Liquid Crystals?

<p>Forehead thermometers and medical devices (C)</p> Signup and view all the answers

What is the primary difference between Liquid Crystals and Leuco Dyes?

<p>Precision of temperature response (C)</p> Signup and view all the answers

What is the construction of SFXC LC sheets?

<p>A thin layer of liquid crystal on a black background with a polyester laminate (C)</p> Signup and view all the answers

What type of inks are used on T-shirts as shown in Figure 9?

<p>Photochromic inks (B)</p> Signup and view all the answers

What type of change can some smart materials exhibit in response to external stimuli?

<p>Change in one or more specific properties (B)</p> Signup and view all the answers

What is a characteristic that distinguishes smart materials from modern materials?

<p>Ability to change in response to external stimuli (D)</p> Signup and view all the answers

What is a key feature of smart materials that sets them apart from other materials?

<p>Change is inherent to the material (B)</p> Signup and view all the answers

What type of stimulus can cause some smart materials to change?

<p>Change in temperature, UV light level, or strain rate (D)</p> Signup and view all the answers

What is a common characteristic of all smart materials?

<p>They are all reactive (C)</p> Signup and view all the answers

What category of materials do smart materials belong to?

<p>Metals, polymers, ceramics, and composites (C)</p> Signup and view all the answers

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