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Building Green in the 21 st Century Engineering with Nanotechnology Why Green? Why Now? What are some challenges? Global Warming? Air and Water Pollution Landfills Nonrenewable Resources Image from stock.xchng (http://www.sxc.hu/) Global Warming Greenhouse gases (especially CO 2 )

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building green in the 21 st century

Building Green in the 21st Century

Engineering with Nanotechnology

why green why now
Why Green? Why Now?
  • What are some challenges?
    • Global Warming?
    • Air and Water Pollution
    • Landfills
    • Nonrenewable Resources

Image from stock.xchng (http://www.sxc.hu/)

global warming
Global Warming
  • Greenhouse gases (especially CO2)
  • Natural cycle or human caused?
    • Can we wait?

Image from stock.xchng (http://www.sxc.hu/)

pollution challenges
Pollution Challenges!
  • Ozone
  • Acid rain
  • Drinking water
  • Chesapeake Bay

Image from stock.xchng (http://www.sxc.hu/)

landfills
Landfills!
  • Take space
  • Produce methane gas (global warming)
  • Add to water pollution

Image from stock.xchng (http://www.sxc.hu/)

nonrenewable resources
Nonrenewable Resources
  • Oil and Natural Gas Imports
  • Mining for coal and mineral deposits
  • Making electricity

Image from stock.xchng (http://www.sxc.hu/)

buildings waste and pollute
Buildings Waste and Pollute!
  • 43% of CO2
  • 40% of Landfills
  • 40% of Electricity

Image from stock.xchng (http://www.sxc.hu/)

what can we do
What Can We Do?
  • Live in caves or tents?
  • Ignore the challenges?
  • Practice the three “R’s”?
  • Innovate and Invent new solutions?

Image from www.stockxpert.com

can nanotechnology help
Can Nanotechnology Help?

bright idea

potential disaster

OR

  • Different Approach to Science and Engineering
    • Building blocks invisible to human eye
  • Not new to Nature
what is nanotechnology
What is Nanotechnology?
  • 1 item (usually 2 to 3) is 1 – 100 nm in size.
  • Substances behave

differently at the nanoscale!

  • Control or manipulate

at the nano scale.

how small is small
How Small is Small!?

100 nm

Comparing one hundred nanometers to the size of a soccerball is like comparing a soccerball to the size of the earth!

http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/

let s compare
Let’s Compare!
  • How small is a human hair (diameter)
  • Compare this to a nanotube (4nm diameter)
surface area volume
Surface Area/Volume

Ratio increases as size decreases

Solubility and Reactivity Increase

Video Clip

Photos from stock.xchng (http://www.sxc.hu/)

everything is sticky
Everything is Sticky

Internal Forces Dominate Over Gravity

Image from stock.xchng (http://www.sxc.hu/)

appearances may deceive
Appearances May Deceive
  • Optical properties vary at the nanoscale.

Image source: http://mrsec.wisc.edu/Edetc/SlideShow/slides/nanoparticles/Au_nanoshells.html

mother nature
Mother Nature

Mother Nature has used nanotechnology for millions of year.

living led s
Living LED’s

Butterflies figured out how to emit light 30 million years ago.

Fluorescent patches on the wings of some butterflies work much like light emitting diodes (LEDs).

http://news.bbc.co.uk/2/hi/science/nature/4443854.stm

wings are colorful and hydrophobic

Look, Mom, I’m dry!

Wings are Colorful and Hydrophobic!

Water droplet

The butterfly’s wing in the picture isn’t getting wet.

The butterfly can thank its nanoscales.

slide19

Or a Butterfly’s Wing!

This picture shows water droplets on a wood surface treated with "Lotus Spray“, a nanotechnology product modeled after the butterfly wing and lotus leaf, which has made the surface extremely water-repellant (superhydrophobic).

The white bar on this picture of a butterfly wing is 1mm long.

The white bar on this nanoscopic view of a butterfly wing is 1 µm.

As the Saying Goes…

“Like Water Off of a Duck’s Back…

http://nanotechweb.org/articles/news/1/11/5/1/0611102

heating and cooling
Heating and Cooling
  • Use HUGE amount of energy
  • Insulators trap air
nanotech insulators
Nanotech Insulators
  • Trap air better
  • High Surface Area to Volume Ratio
  • Examples:
    • Spray or paint on
    • Aerogel
    • Window Film

Printed with permission

http://www.nansulate.com/

lighting
Lighting
  • Uses almost one-third of energy
  • 95% wasted as heat
  • Fluorescent bulbs contain mercury
  • Light-emitting Diodes (LEDs) safer and more efficient
led fundamentals
LED FUNDAMENTALS
  • Semiconductor material
  • Electrons flow one direction (diode)
  • Photons released
  • Color depends on material/band gap
safety
Safety
  • Avoid placing incandescent bulbs against flammable surfaces.
procedures
Procedures
  • Turn off room lights.
  • Measure temperature (oC) and illuminations (lumens). Lights off.
  • Measure temperature (oC) and illuminations (lumens). Lights on.
  • Record “raw data” (first part of data sheet)
led efficiency lumens watt
LED Efficiency (lumens/watt)

LEDs are highly efficient compared to other light sources.

organic leds
Organic LEDs
  • Small applications today
  • Potential to mimic natural light
  • Flat or curved
  • Potential to be more efficient and less expensive

Photos from stock.xchng (http://www.sxc.hu/)

steel and concrete and wood
Steel and Concrete(and Wood?)

http://www.indigo.com/models/gphmodel/minit-carbon-nanotubes.html"> zig zag, chiral and armchair carbon nanotubes</a> courtesy of Indigo®; Instruments.

other applications
Other Applications
  • Glass
  • Plastics
  • Drywall
  • Wiring
  • Roofing Tiles
  • Sensors
review
Review
  • Why Green? Why Now?
  • What is nanotechnology and how can it help?
  • How do LEDs work?
  • Environmental and human health concerns