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![Page 1: Nanotechnology S. Tom Picraux Dept. of Chemical and Materials Engineering Fulton School of Engineering picraux@asu.edu Arizona State University Science,](https://reader036.fdocuments.in/reader036/viewer/2022081501/56649e005503460f94aea3ec/html5/thumbnails/1.jpg)
Nanotechnology
S. Tom PicrauxDept. of Chemical and Materials Engineering
Fulton School of [email protected]
Arizona State University
Science, Technology and Public AffairsPAF 547
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This presentation has 2 objectives:
- Overview the scientific basis of nanotechnology
- Highlight the government’s role and current public policy issues in nanotechnology
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— working with matter down to the molecular level to create structures and devices ~1 to 100 nm in size with fundamentally new organization, properties, and performance
Nanotechnology: a definition
• takes us to the realm where the properties of materials are dramatically different.
• demands new tools and new understanding.
• may hold the key to a 21st century industrial revolution.
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What are the key challenges of nanoscale science and technology?
Making nanomaterials Self assembly, top down vs. bottom up
Characterizing nanostructures Imaging and measuring small things
Understanding properties “Nanoland” lies between macro world and single atoms and molecules
Nanosystems integration & performance - How do we assemble nanostructures into systems (this is the high payoff area)
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Self-Assembly: Nature’s approach to nanotechnology
Photosynthesis centers• optical receptor molecules are precisely
aligned via spontaneous organization• alignment promotes collection, storage,
and utilization of light energy
Living Cell Walls• “fluid” molecular arrays rearrange
in response to chemical stimuli• changes in membrane structure
influence intercellular diffusion
Dynamic restructuring of moleculararrays provides adaptive response.
3D molecular arrangementspromote resonant coupling.
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How to build things at the nanoscale?Conventional MachinesBuild and assemble
Microelectronics Top down - build in place
NanotechnologyBottom up - self assembled
(m - mm)
(10 - 0.1 µm)
(1- 100 nm)
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Things NaturalThings Natural Things ManmadeThings Manmade
Fly ash~ 10-20m
Head of a pin1-2 mm
Quantum corral of 48 iron atoms on copper surfacepositioned one at a time with an STM tip
Corral diameter 14 nm
Human hair~ 50-120m wide
Red blood cellswith white cell
~ 2-5 m
Ant~ 5 mm
Dust mite
200 m
ATP synthase Nanotube electrode
Carbon nanotube~1.3 nm diameter
O O
O
OO
O OO O OO OO
O
S
O
S
O
S
O
S
O
S
O
S
O
S
O
S
PO
O
The Challenge
Fabricate and combine nanoscale building blocks to make useful devices, e.g., a photosynthetic reaction center with integral semiconductor storage.
Mic
row
orl
d
0.1 nm
1 nanometer (nm)
0.01 m10 nm
0.1 m100 nm
1 micrometer (m)
0.01 mm10 m
0.1 mm100 m
1 millimeter (mm)
1 cm10 mm
10-2 m
10-3 m
10-4 m
10-5 m
10-6 m
10-7 m
10-8 m
10-9 m
10-10 m
Visi
ble
Nan
ow
orl
d
1,000 nanometers = In
frar
edU
ltrav
iole
tM
icro
wav
eSo
ft x-
ray
1,000,000 nanometers =
Zone plate x-ray “lens”Outer ring spacing ~35 nm
Office of Basic Energy SciencesOffice of Science, U.S. DOE
The Scale of Things – Nanometers and MoreThe Scale of Things – Nanometers and More
MicroElectroMechanical (MEMS) devices10 -100 m wide
Red blood cellsPollen grain
Carbon buckyball
~1 nm diameter
Self-assembled,Nature-inspired structureMany 10s of nm
Atoms of siliconspacing ~tenths of nm
~10 nm diameter
DNA~2-1/2 nm diameter
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Nanomaterials: new physics and chemistry
revolutionizes materials performance
Lead to:GPa strength from Ni
New phenomena associated with:• Small size (e.g. quantized effects)
• Preponderance of surfaces and interfaces
• New modes of electronic transport
• Radical changes in collective phenomena
• New chemical reactivities
• New mechanical properties0
1
2
3
4
5
6
Al+O-impl. Ni
Type 440Cbearing steel
Ni
Yie
ld S
tren
gth 2-nm Al2O3
particles
Single moleculesensing
Practicing “alchemy” through structure
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Carbon Nanotubes: example of extreme properties
Nanotubes for Electronics, Scientific American, Dec. 2000
The scale of nanostructures
Top down
(~200 nm)
Bottom up
(~1 nm)
armchair
zig-zag
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Information technology Quantum electronics (logic, memory), magnetic memory, spintronicsEnergy Large scale, low cost nanoparticle-based solar energy collection High efficiency solid state lightingHealth In situ drug delivery Diagnostics, active monitoring, performance enhancementEnvironment Low cost, nanosensor arrays for health, safety Nanoparticle based waste destruction Nanomanufacturing Large area, bottom up assembly for low waste, energy efficient manufacturing
Why are nanomaterials attractive?
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Practical applications are at an early stage
The Top Ten Nanotech Products Of 2003 Robert Paull, The Forbes/Wolfe Nanotech Report, 12/29/03
1) High-Performance Ski Wax 2) Breathable Waterproof Ski Jacket 3) Wrinkle-Resistant, Stain-Repellent Threads 4) Deep-Penetrating Skin Cream 5) World's First OLED Digital Camera 6) Nanotech DVD and Book Collection 7) Performance Sunglasses 8) Nanocrystalline Sunscreen 9 & 10) High-Tech Tennis Rackets And Balls
It has been estimated that nanostructured materials and processes can be expected to have a market impact of over $340 billion within a decade (Hitachi Research Institute, 2001).
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Public visibility is growing
Washington Post, Sunday, Feb. 22, 2004
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Nanotechnology and SocietyNanotechnology and Society
• Are paradigm shifting consequences of nanotechnology likely to occur?
• Are there areas where broad societal debate needs to be carried out concurrent with research?
• What is the role of government?
• What are the responsibilities of scientists and engineers?
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0100200300400500600700800900
1000
FY01 FY02 FY03 FY04 FY05 (req)
Pre-programFY01 funding
Total NNI
Funding($M)
Fiscal Year
National Nanotechnology Initiative U.S. Funding
Worldwide nanotech funding ~$3.5B in FY03: (Europe, Japan, US, Korea, Singapore, Taiwan, China, …)
Governments play a significant role in the development of Nanotech
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0
50
100
150
200
250
300
350
NSF DOD DOE NIH NIST NASA EPA Others
FY04 Funding by Agency
NNI Funding
($M)
Nanotechnology cuts across a wide area of society
U.S. Government Agency
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NNI Program Grand Challenges
1. Nanostructured materials by design 2. Manufacturing at the nanoscale3. Chemical-biological-radiological-explosive detection4. Nanoscale instrumentation and metrology5. Nano-electronics, photonics, and magnetics6. Healthcare, therapeutics and diagnostics7. Efficient energy conversion and storage8. Microcraft and robotics 9. Nanoscale processes for environmental improvement
The enormous U.S. investment in nanotechnology is predicated on economic competitiveness and societal
impact
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S189 signed Dec. 3, 2003National Nanotechnology Bill
An authorization bill Follows the NNI program directions Emphasizes program:
management coordination review/oversight and ethical, legal, environmental and societal concerns!
Governments respond to societal priorities and concerns
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The National Nanotechnology Bill creates:
American Nanotechnology Preparedness Center 1) “conduct, coordinate, collect, and disseminate studies on the societal, ethical,
environmental, educational, legal and workforce implications of nanotechnology”
2) “identify anticipated issues related to the responsible research, development, and application of nanotechnology, as well as provide recommendations for preventing or addressing such issues”
Center for Nanomaterials Manufacturing1) encourage, conduct, …. research on new manufacturing technologies for
materials, devices, and systems …2) Develop mechanisms to transfer such manufacturing technologies to U.S.
industries
Specific societal-driven inclusions in the S189 Bill
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Nanotechnology and Society:
Nanoparticles – Potential Health Risks
• Properties change with size.− Can some sizes + compositions have adverse health effects?
− Implications for gov’t regulatory system.Same chemical, different forms: e.g., carbon black, diamond, buckyball, nanotube
Same chemical, different size: e.g. TiO2, quantum dots (CdS, CdSe)
• Can nanoscale particles cross biological barriers?
• What are our responsibilities and precautions?− in the lab?
− in the factory or the environment?
− in consumer products?
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Nanoscale Materials Categorizations
Naturally occurring “ultrafine particles” Virus – 10 to 60 nm Bacteria – 30 to 10 µm Dust from deserts - ~ 100 nm Volcanic ash, Forest fire smoke
“Ultrafine particles” from established technologies or by products of conventional Processes
Combustion soot – 10 to 80 nm Paint pigments – 80 to 100 nm Welding fumes – 10 to 50 nm Diesel exhaust particles – (Small mode) 7 to 40 nm Carbon black for photocopier toner – 10 to 400 nm
Engineered nanoscale materials – “nanomaterials” Fullerenes – buckyballs – 1 nm: nanotubes – 1 to 5 nm x 10 µm Quantum dots for medical diagnosis– 5 to 20 nm Semiconductor wires for sensors – 10 to 100 nm diam. x 1 µm
NNI Clayton Teague presentation, 4/2/04
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Some Initial Health Studies of Nanoparticles
• Lam et al. (2004) – washed 3 kinds of carbon nanotubes into lungs of mice; all caused lung granulomas
• Dupont injected nanotubes into rat lungs; 15% died (highest death rate seen in such studies)
• SMU – buckyballs cause extensive brain damage in fish
• Rice University – studies show nanoparticles bioaccumulate in living tissues
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Specific Federal Projects on Implications
NIH/ NIEHS – support of the new National Toxicology Program, ~$3M multi-year project initiated in FY2004
Studies to evaluate the toxic and carcinogenic potential of test agents (quantum dots, nanotubes) in laboratory animals via inhalation exposure
EPA – Impacts of manufactured nanomaterials on human health and the environment, $4M in FY2004
Toxicology of manufactured nanomaterials Fate, transport, and tranformation of manuf. Nanomaterials Human exposure and bioavailability
NNI Clayton Teague presentation, 4/2/04
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Nanotechnology and Society: Public Debate
Ubiquitous Nanosensors – Privacy of the individual
• What if the walls have eyes and ears?
• What if sensors can be attached to me without my knowledge?
• Is my health and genetic susceptibilities private information?
(continued)
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Nanotechnology and Society: Public Debate
“Bots” – Self replicating nanomachines
• Is it feasible?
• What previous experience can we draw upon?
• Is responsible action needed?
(continued)
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Nanotechnology and Society: Public Debate
“NanoAssistors” – Human-machine interfaces
• Are human assistive devices for the disabled appropriate nanotechnology to support?
• Should nanotechnology be used to enhance human performance?
− for warfighters?
− for athletes?
− for my children?
• Who decides?
(continued)