Liquid crystals (LCs) combine liquid fluidity with crystal-like order. Use the interactive diagrams below to explore phase transitions, LCD operation, and thermochromic effects.
Discovered in 1888 — now in every smartphone and medical scanner.
1. Interactive Phase Transitions
Adjust temperature to see molecules transition between crystal → smectic → nematic → isotropic.
Phase Transition
| Phase | Temperature Range | Molecular Order | Appearance |
|---|---|---|---|
| Crystal | < 20°C | Full positional + orientational | Solid, rigid |
| Smectic | 20–60°C | Layers with sliding | Viscous, layered |
| Nematic | 60–100°C | Orientation only | Fluid, aligned |
| Isotropic | > 100°C | Random | Clear liquid |
2. Interactive LCD Pixel (Twisted Nematic)
Toggle voltage to see how light is blocked or transmitted in an LCD pixel.
How It Works
- Light enters through polarizer 1 (vertical).
- LC molecules twist light 90° → passes polarizer 2 (horizontal) → bright.
- Voltage aligns molecules → no twist → light blocked → dark.
3. Interactive Thermochromic LC (Thermography)
Change temperature to see color shift in a cholesteric liquid crystal — used in thermal imaging.
Red (35–40°C)
Hot spots — inflammation, electronics failure
Green (30–35°C)
Normal skin or component temperature
Blue (25–30°C)
Cool areas — poor blood flow, insulation
Summary
Interactive Highlights:
- Phase Simulator: Drag temperature to watch molecular ordering change.
- LCD Pixel: Apply voltage to control light — the heart of every screen.
- Thermography: See real-time color mapping for medical and engineering use.
Liquid crystals bridge physics, chemistry, and engineering — enabling smart materials that respond to heat, light, and electricity.