Nanoimprinting
How to Replicate the grating structure from old DVD using nanoimprint and it’s application in improving solar cell efficiency. By Chen Zou Electrical Engineering Overview: In this demonstration lab students replicate a nano-scale grating structure from old DVD using nanoimprinting. They explore the technique could be used in improving solar cell efficiency. Essential Question How can we mass produce materials with nano-scale features using imprinting technique? Background: [caption id="" align="alignright" width="170"] Pits on CD-ROM and DVD[/caption] Small features on the surface of materials can create a variety of useful properties. Repeated small pit or lines on the scale of 10-100 nm cause some interesting effects with light. The rainbow color of...
Luminescent Solar Concentrator
[vc_row][vc_column][vc_column_text] Overview: This maker project demonstrates how fluorescent materials can be used to make a new kind of solar panel. [caption id="attachment_5066" align="alignright" width="276"] A model luminescent solar concentrator.[/caption] Essential Question: Can we make a device that collects diffuse radiation and concentrates it for electrical generation? Background: A luminescent solar concentrator (LSC) is a transparent piece of plastic or glass that has a fluorescent dye or quantum dots embedded or painted on it. The dye absorbs light and then fluoresces creating a glow that propagates by total internal reflection to the edge of the sheet where the light is absorbed by a narrow solar cell. This is a promising technology because...
Polymers
[vc_row][vc_column][mkd_section_title title="Polymers" title_size="large" title_color="" title_text_align="" margin_bottom="" width=""][vc_column_text]By Monica Esopi The intention of this lesson is to learn background about polymer materials and their applications, and to explore these materials through hands-on activities (making slime and bouncy balls). Students will be able to make their own polymers and explore their properties. These activities can be done individually, or in pairs or groups. Students will make slime to explore cross-linking, and then make bouncy balls to see the impact of a thickening agent.[/vc_column_text][vc_empty_space height="30px"][vc_hoverbox image="18213" primary_title="" primary_align="left" hover_title="QUESTION" shape="square" el_width="30" align="left"]How can simple molecules be joined together in chains or networks to make a substance with different...
Rainbow Bookmarker
[vc_row][vc_column][mkd_section_title title="Rainbow Bookmarks" title_size="large" title_color="" title_text_align="" margin_bottom="" width=""][vc_column_text]In this activity, students trap an extremely thin layer of clear nail polish which causes interference of light waves making a rainbow layer on a black bookmark. PDF[/vc_column_text][vc_empty_space height="30px"][vc_hoverbox image="18203" primary_title="" primary_align="left" hover_title="QUESTION" shape="square" el_width="30" align="left"]What happens when light reflects off thin layers of materials?[/vc_hoverbox][vc_empty_space height="40px"][mkd_accordion style="boxed_toggle" el_class="GLOWING COLORS"][mkd_accordion_tab icon_pack="" title="Background"][vc_column_text]The reason the rainbow is seen is because the layer of clear nail polish is so thin that it reflects light in different wavelengths. Slight difference in thickness cause light waves of different length to interfere with each other-- sometimes cancelling and sometimes reinforcing. Other examples of...
Absorption and Fluorescence with USB Spectrometer
[vc_row][vc_column][vc_column_text] Overview: [caption id="attachment_4862" align="alignright" width="297"] A USB spectrometer measures light that passes through a solution in the cuvette.[/caption] Students explore how different materials absorb and emit light, then measure spectra with a desktop spectrometer. Essential Question: How do we measure the absorption and emission of light? Background: Light travels from here to there like a really fast bullet. When we see a light turn on, there are particles of light called photons that travel from the lamp to your eye. Light goes so fast that in one second, light travels 180,000 miles! That's traveling across the US 72 times in one second! All light is made of photons, when a...
Glowing Colors
[vc_row][vc_column][vc_column_text]Students explore how different materials absorb and emit light of different colors[/vc_column_text][vc_empty_space height="30px"][vc_hoverbox image="18248" primary_title="" primary_align="left" hover_title="QUESTION" shape="square" el_width="30" align="left"]How can materials make light of different colors?[/vc_hoverbox][vc_empty_space height="40px"][mkd_accordion style="boxed_toggle" el_class="GLOWING COLORS"][mkd_accordion_tab icon_pack="" title="Background"][vc_column_text]White light is composed of lights of different colors. Each color is carried by a light moving as a wave. Different materials reflect light of different colors, or they absorb light of other colors. If an object appears red, it because all the other colors besides red are absorbed and only red light is reflected. Some materials create light when they are energized by light, electricity, heat or by chemical reactions. This...
