Transcript Presentation - Nano

Nitinol
Copyright © 2012 Board of Trustees, University of Illinois. All rights reserved.
Objectives
• To investigate the unique properties of an alloy
called Nitinol
• To design an experiment using Nitinol
• To understand the connection between Nitinol’s
atomic structure and its physical characteristics
• To learn about Nitinol’s applications
2
Nanotechnology
• Some scientists and engineers develop
smart materials
3
Smart materials
• Any material
engineered at
the nanoscale
to perform
specific tasks
4
Smart fabrics
5
Self-healing materials
• Studied and made at
University of Illinois
• Can repair themselves
• Can be used in cell phones
and other devices
6
How self-healing materials work
7
Similar to epoxy
8
A smart alloy
NiTiNOL
• Made of Nickel and Titanium at Naval Ordnance Laboratory
9
Nitinol—a smart material?
• Bend it
• Heat it
• What happens?
10
Shape Memory Alloy (SMA)
• Nitinol is a “shape
memory alloy”
• What does that
mean?
• What is happening
at the nanoscale?
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Phases of matter
Solid
strong bonds
Liquid
weak bonds
Gas
no bonds
12
Martensite phase of Nitinol
• Lower temperature
• Very flexible
• Can easily be
deformed (changed)
Martensite
Deformed
Martensite
13
Austenite phase of Nitinol
• Higher temperature
• Rigid
• Has defined shape
14
Solid phases of Nitinol
→
heat
15
What you observed
16
What happened at the atomic level
17
Nitinol
(Click on image to play.)
18
Other ways to heat it?
→
heat
19
Can you “retrain” it?
Can you give
Nitinol a new
shape memory?
20
Properties of Nitinol
• Shape memory alloy
• Elastic
• Does not react with
water or oxygen
• Can be used in the
body
21
Austenite temperature
• Slight difference in ratio
of Ni to Ti can change
the temperature from
-50°C to +95°C
• Engineered for different
functions
22
Think!
• How do you
think Nitinol
might be useful?
23
Medical applications
•
•
•
•
•
Needles
Orthodontic devices
Guidewires
Catheters
Stents
24
Other applications
25
Summary
1. Learned about
Nitinol’s properties
2. Heated it
3. Found other ways of
heating it
4. Retrained it
5. Learned about its
applications
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