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I. Overview/Introduction

Light and the Nano particle. I. Overview/Introduction

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I. Overview/Introduction

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  1. Light and the Nano particle. I. Overview/Introduction Nanotechnology has been proclaimed as the gateway to the future of technology. The economic future of our country may well be tied to the advances in science and engineering that will be driven by nanosciences. These changes can be as mundane as chemical additives to the next series of modern CPU's. Nanotechnology can be used to demonstrate basic principles of physics such as the bandgap and its relation to the absorption of light. We will use common drugstore materials in a hands on demonstration to show how light is absorbed or blocked by materials.

  2. II. Objectives: We are going to use a hands on experiment to gain some insight on these questions. • What is light? • Is it a particle or a wave? • How can we use these properties? • Sunscreen and make-up has been one of the first beneficiaries of the new technology. • How can you use this materials • III. Students will. • Understand the vocabulary of physics as it applies to light and semiconductors. • Understand the advantages of the nanoscale as it applies to prevention of skin cancers. • Develop a lesson plan for this hands on experiment.

  3. IV. Materials • Ultraviolet (UV) Sensitive Paper – Nature Print paper • UV light source (could be the sun itself)‏ • Nano Zinc Oxide • Desitin (micro Zinc Oxide)‏ • Organic Compound Sunscreen • Oil • V. Vocabulary. • Band Gap • Work Function • Fermi – Dirac function • Electron • Hole • Wavelength • Schrödinger's Wave Equation • Bohr Model • Nanometer • Frequency • Miller Indices • Photoelectric effect

  4. VI. The "Hands-On” experiment • This experiment is a qualitative demonstration of the effects of nano crystals. • Take a sheet of blue tinged paper. • Set a thin coat of sunscreen on the paper • Put the paper in UV light • Time the exposure to produce a lightening of the blue paper. VII. Assessment Oral Assessment Vocabulary assessment Lesson Plan VII. References http://www-vrl.umich.edu/project2/miller/MillerIndices.wrl http://www-vrl.umich.edu/project2/miller/MillerIndices_2.wrl http://www-c.inria.fr/gamma/OBJECTS/MOLECULE//zno_cut_WRL_V2.wrl.gz http://hyperphysics.phy-astr.gsu.edu/hbase/hyde.html http://www.canon.com/technology/s_labo/light/001/11/005.html http://www.walter-fendt.de/ph11e/photoeffect.htm

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