True Blue Titanium Game

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True Blue Titanium Game
Department of Chemical Engineering University of
Connecticut Presented by Professor Suzanne S.
Fenton
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Goals and Objectives

• To raise awareness of the chemical engineering
  profession
• Provide hands-on investigation
• of chemical engineering phenomena
• Introduce experimental practices and methods
• Practice teamwork/group problem solving

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How to Play

• Assemble groups of 3-4 students into companies
• Each company is competing for a 10,000,000
• contract to produce titanium strips
• The criterion for competition
• Your product must exactly match the model
• Your product must be consistently reproducible
• You must be able to accurately predict process
  condition necessary to produce any specified color

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How to Play

• Companies have 50 minutes to
• Assemble the process
• Plan a strategy, run experiments take data
• Produce titanium strips
• At the end of 50 minutes, each company will
• Show their product
• Demonstrate product reproducibility
• Present their approach for developing a
  predictive model by which any color could be
  produced
• The winning company will receive the 10,000,000
  contract (or similar prize)

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Background Information

• Electrochemical Reactions
• Cathode reaction
• 4H2O 4e- ? 2H2 4OH-
• Anode reaction
• 4OH- ? 4e- 2H2O O2

Amt H2 O2 Produced ? I t I current t time
elapsed
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Background Information

• Chemical Reaction
• O2 formed via electrochemical reaction then
  reacts with the titanium metal
• Ti4 O2 ? TiO2
• TiO2 (titanium oxide) a transparent oxide film
  forms on the titanium metal

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Background Information

• Film formation mass transfer limitations
• As time ? TiO2 layer (an insulator)
  thickens
• layer may become so thick, electrons have
  difficulty passing through it (no current flows
  and all reactions stop)
• the process is MASS TRANSFER LIMITED
• Oxide film thickness ? Voltage time

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Background Information

• Thin film interference
• Some light is reflected by surface of film and
  some passes through and is reflected off the
  metal below
• Colors are produced by the constructive
  interference of reflected light a function of
  the film thickness

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Background Information

• In Summary
• Different voltages and anodizing times affect the
  thickness of oxide film on the titanium
• Different thicknesses
• produce different colors

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Hints

• You might find it helpful to measure the current
  during your experiments
• You might also find it helpful
• To measure the time

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Safety Considerations
3- 9v batteries in series will produce 27
volts This is enough to give a significant
shock DO NOT touch bare wires Batteries that
are directly shorted may rupture, releasing
battery chemicals BE SURE to connect batteries
as directed