Nanotechnology - Unit Detail
16 lessons, 1 hour each
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Lesson 2.2 – Seriously Hydrophobic Stuff B
In this lesson students will:
- Be introduced to additional hydrophobic materials, including Polyfluorinated materials.
- Investigate Teflon as an example of a hydrophobic materials in wide use in everyday life.
- Look at SBS rubber as an example of how the Nano-scale properties of a substance can affect its bulk properties.
- What are the properties of Polyfluorinated and Lipophobic materials?
- Where are we likely to encounter materials with these properties in our everyday lives?
Learning SequenceShow all resources
Welcome students and briefly review the key ideas on hydrophobic materials from the previous lesson.
Investigation – Teacher uses PowerPoint L2.2 Surface Tension.pptx to investigate student understandings of surface tension. Resources
Discussion – Invite students to provide examples of hydrophobic materials, and introduce Polyfluorinated materials as being both hydrophobic and Lipophobic. The surface coating ‘Teflon’ is a good example of a common Polyfluorinated surface used widely in households. Resources
Investigation – Students to view the YouTube – Hydrophobic Surfaces – GE clip that are designed to keep surfaces clean and dry. Resources
Discussion – Students to view the YouTube - Lotus effect superhydrophobic surfaces clip. Teacher invites questions raised by viewing the clip. Resources
Investigation – Teacher investigates the properties of Teflon and SBS rubber – how do the surface/Nano-scale properties of these substances affect their bulk properties? Several samples of Teflon coated surfaces and SBS rubber are required.
Reflection – What would you treat and not treat with a polyfluorinated coating? Students to discuss and provide feedback to the teachers and other students.