Nano particles Simulation Description
Three interactive 3D modes, all orbitable by drag, zoomable by scroll/pinch, with full SEND accessibility.
◆ Nanoparticle (Gold Au) A ~115-atom gold FCC metal crystal cluster rendered with per-instance colouring: bright gold on the outer surface fading to deeper amber in the interior, reflecting that surface atoms are chemically distinct from bulk atoms. The cluster breathes with a subtle thermal vibration. Toggle 💊 Drug Delivery to watch 12 magenta drug molecules stagger-release from the nanoparticle surface in a looping cycle — each molecule drifts outward from its attachment site at a different phase, showing how drug payloads are carried and released at a target site.
⬡ Fullerene C₆₀ A geometrically exact buckminsterfullerene: 60 carbon atoms and 90 bonds computed via icosahedron truncation at the precise parameter t = 1/(2+φ) that gives all bonds equal length. The molecule slow-rotates as a rigid group so atoms and bond cylinders stay perfectly aligned. Toggle ⚡ Electrons to fade in a semi-transparent π-electron shell around the cage and nine orbiting electron particles, visualising the delocalised electron system responsible for C₆₀’s conductivity when doped.
▣ Surface Area A direct demonstration of the SA:V ratio formula SA/V = 6/L. One cube (L=4, SA/V=1.5) animates apart into 8 cubes (L=2, SA/V=3.0) then 64 cubes (L=1, SA/V=6.0) with each click of ↗ Split. The cubes spread from packed to separated with a smooth lerp, making visible the extra surface that gets exposed. The live badge always shows the current SA/V value.
Hover tooltips on every atom give AQA-precise descriptions. The 🏷 Labels panel shows a full teach panel for every combination of mode + toggle, with AQA sub-text, risks, uses, and extension content.
Suggested Class Activity
“From Bulk to Nano” — three-station investigation (20–30 min)
Station 1 — Surface Area Calculator (Surface Area mode)
Give each pair a mini-whiteboard. They open the simulation at Surface Area mode and record:
| Split level | No. of cubes | Side length L | SA/V |
|---|---|---|---|
| 0 | 1 | 4 units | ? |
| 1 | 8 | 2 units | ? |
| 2 | 64 | 1 unit | ? |
Students fill in SA/V using SA/V = 6/L, then verify by reading the badge. Challenge question: “If L = 0.001 units (a real nanoparticle), what would SA/V be? Why does this make nanoparticles so reactive?”
Station 2 — Drug Delivery Sketch (Nanoparticle mode)
Students toggle Drug Delivery on and sketch what they see: nanoparticle → drug molecules attached → molecules drifting to target. They annotate: (a) why nanoparticles make better drug carriers than dissolved tablets, (b) one benefit and one risk. Prompt card: “Why might a doctor want the drug to stay attached until it reaches a cancer cell?”
Station 3 — Allotrope Comparison (C₆₀ mode)
Students toggle Electrons on and complete a comparison table:
| Property | Diamond | Graphite | Fullerene C₆₀ |
|---|---|---|---|
| Bonding per C | |||
| Free electrons? | |||
| Conducts electricity? | |||
| Special use |
They use hover tooltips and the Labels panel to find the answers rather than notes — the simulation is the source. Final discussion: “Why is C₆₀ being researched for drug delivery if it’s made of the same element as diamond?”
Plenary: cold-call three students, one per station, to explain their finding in one sentence. Links the three modes into the single AQA concept thread — same element (carbon, gold) behaves completely differently at different scales and structures.