Do Now Smartphones have large glass screens that respond when you touch them. How do you think the phone "knows" where you are touching it? Write.

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Presentation transcript:

Do Now Smartphones have large glass screens that respond when you touch them. How do you think the phone "knows" where you are touching it? Write down your ideas in your lab notebook. Image from Gigaohm.com

Image from electronics.howstuffworks.com

Cutaway view of touchscreen Yoo et al. (2008), Solar Energy Materials & Solar Cells 92(8):873-877

Sol-Gel Spin Coating Drip Spin Spread Dry Image from commons.wikimedia.org Drip Spin Spread Dry Making thin-film electronics requires a solution that will spread and dry evenly on the SUBSTRATE (surface material) you’re spreading it on.

Intermolecular forces pull molecules together Image from chemizzle.com

Intermolecular forces create COHESION and ADHESION Images from http://ga.water.usgs.gov/edu/adhesion.html

Water on mirror: ADHESION > COHESION COHESION > ADHESION Water on soap: COHESION > ADHESION http://www.appstate.edu/~goodmanjm/rcoe/asuscienceed/background/waterdrops/waterdrops.html

Contact angle shows the balance of cohesion & adhesion Angle is measured from one side of the drop to the other. (Drop should be inside the angle) Images from http://cnx.org/content/m42197/latest/?collection=col11406/latest

http://www.dsm.com/en_US/html/dep/adhesive_bonding.htm

VERY POLAR, SOMEWHAT POLAR, OR NONPOLAR? acetone ammonia VERY POLAR, SOMEWHAT POLAR, OR NONPOLAR? water chloromethane 2-methylpentane commons.wikimedia.org