December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of...
-
Upload
priscilla-harrington -
Category
Documents
-
view
214 -
download
0
Transcript of December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of...
![Page 1: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/1.jpg)
December 4, 2014
What’s Nano about Light?
![Page 2: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/2.jpg)
Today’s Plan
• Introduce the International Year of Light
(IYL)
• Discuss possible partners for IYL
• Present NISE resources for IYL
• Describe the science behind two NanoDays
activities
• If time, a surprise!
2
![Page 3: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/3.jpg)
International Year of Light (IYL)
“A global initiative adopted by the United Nations to raise awareness of how optical technologies promote sustainable development and provide solutions to worldwide challenges in energy, education, agriculture, communications and health.”
“The science and applications of light creates revolutionary - but often unseen - technologies that directly improve quality of life worldwide.”
3http://www.light2015.org/
CommunicationsHealth Economy Environment Social
![Page 4: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/4.jpg)
Celebrating Light
4SPIE, http://www.youtube.com/watch?v=rcoMeWV0jZc
![Page 5: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/5.jpg)
What’s Nano about Light?
5
Stained glass(metallic nanoparticles)
Medicine (nanoparticles, nano-coatings)
Electronics(nanostructures like thin films)
Energy(nanostructures)
SPIE, http://www.youtube.com/watch?v=rcoMeWV0jZc
![Page 6: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/6.jpg)
Why Should You Care About the IYL?
• Kids are naturally interested in light and color
• This is a great opportunity for partnering with scientists
• There are tons of great NISE resources (activities and videos) related to light
6
![Page 7: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/7.jpg)
Check-in Time
(1)Are you interested in trying to bring in scientists for IYL events?
(2)Do you already know scientists you could contact?
7
![Page 8: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/8.jpg)
IYL Partner Organizations
8http://www.light2015.org/
![Page 9: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/9.jpg)
Finding a Partner
• IYL is a great time to approach scientists, because they’re supposed to be involved in outreach
• What kinds of scientists/organizations are involved in IYL?
• NISE has contacts in SPIE and OSA
9
• Physicists• Material scientists/engineers• Electrical engineers• Optical engineers
• SPIE (physicists/engineers)• APS (physicists)• OSA (physicists and engineers)• IEEE (engineers)
APS = American Physical Society, OSA = Optical Society of America, IEEE = Institute of Electrical and Electronics Engineers
![Page 10: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/10.jpg)
Check-in Time
Any general questions about the International Year of Lightor finding scientist partners?
10
![Page 11: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/11.jpg)
Light-related Resources from NISE
11
NanoDays activities
Videos
Programs
http://www.nisenet.org/events/other/international-year-light-2015
So many great resources!
![Page 12: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/12.jpg)
Light-Related ActivitiesMany of these activities aren’t just related to light—they’re also an excellent introduction to everything that’s cool and unique about nano
12
![Page 13: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/13.jpg)
Light-related Topics: Examples• Light in nature
• Butterfly• Thin Films• Bubbles
• Nanoscale-phenomena• Sunblock• Nano Gold• Invisibility
• New technologies/devices• Liquid crystal displays• Thin Films 13
http://www.nisenet.org/
![Page 14: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/14.jpg)
Light-Related Videos
14
http://vimeo.com/31270439
Nano and Me - Gold
http://vimeo.com/74400132
What’s Nano About Bubbles?
http://www.nisenet.org/
![Page 15: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/15.jpg)
Check-in Time
(1)Do you have a favorite light-related activity from NISE? If so, what is it?
15
![Page 16: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/16.jpg)
Check-in Time
(1)Do you have a favorite light-related activity from NISE? If so, what is it?
(2)Do you find it challenging to describe the science behind any of NISE’s light-related activities? If so, which one(s)?
16
![Page 17: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/17.jpg)
Absorption, Reflection, and Transmission
17
• Sunlight and other white light contains all colors
• When light hits an object, it can be• Absorbed• Reflected• Transmitted
• In the case of raspberries• Green and blue are strongly
absorbed• Red is only partially absorbed
![Page 18: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/18.jpg)
Absorption, Reflection, and Transmission
18
Absorption + Reflection + Transmission = 100%
http://design.tutsplus.com/tutorials/draw-a-shiny-make-up-mirror-with-adobe-illustrator--vector-4418
![Page 19: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/19.jpg)
Check-in Time
Why does a red apple look red?
(1)It absorbs most of the red light from the sun
(2)It reflects most of the red light from the sun
(3)It transmits most of the red light from the sun
19
![Page 20: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/20.jpg)
Why does a red apple look red?
(1)It absorbs most of the red light from the sun
(2)It reflects most of the red light from the sun
(3)It transmits most of the red light from the sun
20
The color of an object is not actually within the object itself. Rather, the color is in the light that shines upon it and is ultimately reflected or transmitted to our eyes. [http://www.physicsclassroom.com]
Learn more here: http://www.physicsclassroom.com/class/light/Lesson-2/Color-Subtraction
![Page 21: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/21.jpg)
Nano Gold (Stained Glass)
21http://design.tutsplus.com/tutorials/draw-a-shiny-make-up-mirror-with-adobe-illustrator--vector-4418
![Page 22: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/22.jpg)
Bulk vs Nano Gold
22
Nano Gold
Bulk Gold
http://education.mrsec.wisc.edu/nanolab/gold_uv/index.html#Introduction
Stained glass
![Page 23: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/23.jpg)
Size and Shape Matter
23http://www.horiba.com/scientific/ http://commons.wikimedia.org/wiki/File:Native_gold_nuggets.jpghttp://www.cat.gov.in/technology/laser/lpas/pps.html
At the nanoscale,size matters!
At the nanoscale,shape matters, too!
![Page 24: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/24.jpg)
How are the Colors Created?
24http://edcvs.co/130nfaU
![Page 25: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/25.jpg)
Resonance Causes Absorption & Scattering
• Bells are a great analogy because they ring due to resonance (reverberation)• We usually think about resonance in terms of sound waves,
but other waves can also undergo resonance
• Metallic surfaces have surface plasmons – delocalized electrons
• These electrons have wave properties
25
![Page 26: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/26.jpg)
Resonance Causes Absorption & Scattering
• Light of a specific wavelength can interact strongly with these delocalized electrons, making them resonate
• We call this surface plasmon resonance
• Light that interacts strongly is absorbed and/or scattered; other wavelengths of light are mainly transmitted• Produces vibrant colors
• To learn more about scattering, read about how scattering causes the sky to look blue
26
![Page 27: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/27.jpg)
Example: Lycurgus cupExample: Lycurgus cupExample: translucent red cupExample: translucent red cup
Color of Reflected vs Transmitted Light
27http://www.shutterstock.com/pic-177894944/stock-photo-group-of-colorful-pink-orange-and-yellow-translucent-plastic-party-cups-with-color-shadows.html
http://www.smithsonianmag.com/history/this-1600-year-old-goblet-shows-that-the-romans-were-nanotechnology-pioneers-787224/?no-ist
But nano gold and silver have different colors in reflected vs. transmitted light
Usually, reflected and transmitted colors are the same
Red light Reflected and transmitted
Green light Absorbed
Blue light Absorbed
Red light Transmitted
Green light Absorbed and scattered
Blue light Absorbed and scattered
![Page 28: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/28.jpg)
Applications of Nano Gold
28https://vimeo.com/channels/nisenet/66928095
![Page 29: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/29.jpg)
UV Bracelets
29http://design.tutsplus.com/tutorials/draw-a-shiny-make-up-mirror-with-adobe-illustrator--vector-4418
![Page 30: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/30.jpg)
UV Beads
30
![Page 31: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/31.jpg)
How UV Light Affects UV Beads
31http://www.profbunsen.com.au/files/uvdetectionbeads.pdf
• Originally beads are colorless because the molecules aren’t good at absorbing light
• UV light breaks bonds and changes the structure of the molecules
• This makes it possible for them to absorb light
UV light
![Page 32: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/32.jpg)
UV Beads
• When not exposed to UV light, the molecules will convert back to their original forms, and beads will once again appear clear
• For older students, could investigate how temperature and other variables affect this process
32http://www.profbunsen.com.au/files/uvdetectionbeads.pdf
ShineUV light
Turn off UV light, then wait
![Page 33: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/33.jpg)
Chemistry Behind Color
• How do pigment and dye molecules absorb light?• Certain wavelengths of light interact with electrons and
promote the electrons to a higher energy level
• These wavelengths (colors) are absorbed
33http://chemwiki.ucdavis.edu/Wikitexts/Prince_George's_Community_College/General_Chemistry_for_Engineering/Unit_1%3A__Atomic_Structure/Chapter_2%3A_Atomic_Structure/Chapter_2.3%3A_Atomic_Spectra_and_Models_of_the_Atom
![Page 34: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/34.jpg)
UV Beads
34
High energy
Low energy
5 eV
Before UV exposure, energy gaps are larger
Visible light doesn’t have enough energy to promote an electron
![Page 35: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/35.jpg)
UV Beads
35
High energy
Low energy
High energy
Low energy
5 eV
2.3 eV
Before UV exposure, energy gaps are larger
Visible light doesn’t have enough energy to promote an electron
After UV exposure, energy gaps are smaller
Certain colors of visible light have enough energy to promote electrons
[Orange bead]
![Page 36: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/36.jpg)
A New Invisibility Demo!
36
Exploring Properties - Invisibility
http://nisenet.org/catalog/programs/exploring_properties_-_invisibility
Invisibility Cloak
http://nisenet.org/catalog/media/invisibility_cloak
Just in time for IYL, there’s a new invisibility (cloaking) demo you can try!
![Page 37: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/37.jpg)
A New Invisibility Demo!
37
Just in time for IYL, there’s a new invisibility (cloaking) demo you can try!
http://www.rochester.edu/newscenter/
![Page 38: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/38.jpg)
The “Rochester Cloak”
38
4 lenses, with some way to hold them up and align them
![Page 39: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/39.jpg)
The “Rochester Cloak”
39http://www.rochester.edu/newscenter/
![Page 40: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/40.jpg)
The “Rochester Cloak”
40
![Page 41: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/41.jpg)
The “Rochester Cloak”
41
![Page 42: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/42.jpg)
The “Rochester Cloak”
42
Fairly cheap, non-consummable materialsFun way to introduce cloakingPairs well with other NISE materials
Hard to keep lenses aligned (especially near a two-year-old!)May be hard to explain
![Page 43: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/43.jpg)
Resources• Stained glass (nano gold)
• Good discussion of scattering: http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html
• UV beads
• Good discussion of pigments: http://hermes.mbl.edu/marine_org/images/animals/Limulus/vision/Wald/photosynthesis.html
• Guide from Educational Innovations: http://cdn.teachersource.com/downloads/lesson_pdf/UV-AST.pdf
• Inquiry-based activities
o http://www.carolina.com/teacher-resources/Interactive/activities-with-uv-beads/tr30403.tr
o http://www.carolina.com/teacher-resources/Document/students-plan-an-experiment-using-uv-beads/tr10866.tr
• Sunblock
• Great discussion of all the science behind nano sunblock; includes Powerpoint slides and lesson plans: http://nanosense.sri.com/activities/clearsunscreen/
• U. of Rochester cloaking demo
• Press release: http://www.rochester.edu/newscenter/watch-rochester-cloak-uses-ordinary-lenses-to-hide-objects-across-continuous-range-of-angles-70592/
• Published article: http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-24-29465%20
• This group has also developed another cloaking device that uses mirrors: https://www.youtube.com/watch?v=GAmWs6zfTj8 and https://www.youtube.com/watch?v=oJb9RnAVDuE 43
![Page 44: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/44.jpg)
Sunblock
44http://design.tutsplus.com/tutorials/draw-a-shiny-make-up-mirror-with-adobe-illustrator--vector-4418
![Page 45: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/45.jpg)
Sunscreens vs Sunblocks
45
• Sunscreens use chemicals
• There are also sunblocks that use minerals like zinc oxide or titanium dioxide
nisenet.org vitaderminstitute.com/
![Page 46: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/46.jpg)
Sunscreens vs Sunblocks, Continued
46
How could sunscreen and sunblock work?
SkinSkin
Sunscreen/SunblockSunscreen/Sunblock
SkinSkin
Sunscreen/SunblockSunscreen/Sunblock
SkinSkin
Sunscreen/SunblockSunscreen/Sunblock
Absorption Reflection Transmission
![Page 47: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/47.jpg)
Sunscreens vs Sunblocks, Continued
47
How could sunscreen and sunblock work?
SkinSkin
Sunscreen/SunblockSunscreen/Sunblock
SkinSkin
Sunscreen/SunblockSunscreen/Sunblock
SkinSkin
Sunscreen/SunblockSunscreen/Sunblock
Absorption Reflection Transmission
Sunscreens and sunblocks both usually work through absorption of UV raysSunblocks are better because they absorb more of the UV rays
![Page 48: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/48.jpg)
Inorganic Sunblocks Absorb UV Better
48
UVB UVA visible
ideal
![Page 49: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/49.jpg)
Nano Sunblocks
49http://www.tackletour.com/reviewbluelizard.html
Traditional zinc oxide sun blocks are very visible
Modern zinc oxide sun blocks are fairly invisible after application
![Page 50: December 4, 2014 What’s Nano about Light?. Today’s Plan Introduce the International Year of Light (IYL) Discuss possible partners for IYL Present NISE.](https://reader035.fdocuments.us/reader035/viewer/2022062516/56649d705503460f94a52cb2/html5/thumbnails/50.jpg)
Nano ZnO and TiO2 Reflect Less Light
50
UVB UVA visible
ideal