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www.purdue.edu/ANE
Agriculture, Engineering, Science
Center for the Environment Birck Nanotechnology Center
Manufactured Nanomaterials in the Environment
Ron Turco, Loring Nies, Chad Jafvert, Bruce Applegate, Natalie Carroll,
Tim Filley, Robert Blanchette1, Leila Nyberg, Zhonghua Tong, Pradnya Kulkarni,
Marianne Bischoff and Benjamin Held1
Purdue University and University of Minnesota1
Acknowledgements The authors acknowledge support from
the National Science Foundation (NSF)
under Award EEC-0404006& United States EPA under Award RD-
83172001-0
RD-83172001-0
Nanotechnology Defined
• Working at length scales of ~1–100 nanometers [nm]– Results in new properties and functions
• Allows an ability to control (to see, measure, and manipulate) matter on the atomic & molecular scale
• Allows us to manipulate systems spanning from nano- to macroscopic scales
Start with a centimeter
Divide it into 10 equal parts (millimeter long)
Divide that into 10 equal parts (100 micrometers)
Divide that into 100 equal parts (micrometer)
Divide that into 10 equal parts (100 nanometers)
Divide that into 100 equal parts (Nanometer)
bean
flea
human hair
bacterium
virus
Nano- material
How small is a Nanometer?
1 cm
1 mm
100 m
1 m
100 nm
1 nm
1 cm = 10,000,000 nm
“There’s plenty of room at the bottom” (1959)
• The inspiration for nanotechnology came from Richard P. Feynman, 1959:
• ”The problems in chemistry and biology can be greatly helped if our ability to see what we are doing, and do thing on an atomic level, is ultimately developed – a development which I think cannot be avoided.”
Science (1985)
• Fullerenes are discovered by Robert Curl, Harold Kroto and Richard Smalley (Noble Prize)
• Spherical fullerenes -- buckyballs,
• Cylindrical nanotubes -- buckytubes
Nano-technology ~ 30 years later
• Eric Drexler (1986) Student in Feynman’s lab
Engines of Creation The Coming Era of Nanotechnology
(concept of “molecular manufacturing”)
Creation of the National Nanotechnology Initiative (NNI-Funding)(~25% DOD)
National Nanotechnology Initiative (NNI)
Budget History
The manufacturing technology of the 21st century
• Fabrication of devices with atomic or molecular scale precision
• Devices with some minimum feature sizes of less than 100 nanometers (nm) are considered to be products of nanotechnology
• The products can have quantum level features
From the Bottom• NT allows a bottom-up manufacturing
approach
• Nanotechnology processes can add:– material until the product has been created– makes the process similar to biological
systems– theoretically possible to start with one atom
• Production at 120 to 180 nm
Materials
• Lighter, stronger and programmable materials
• Lower failure rates and reduced life-cycle costs
• Better electrical efficiencies • Bio-inspired /Bio-reactive materials• Multifunctional, adaptive materials • Self-healing materials• Self-cleaning surfaces (e.g., windows)
Nano-based Products
• Computing, Data Storage, Electronics– Organic light-emitting diodes (OLEDs)– Nanoscale transistors– LCDs, LEDs, MP3s, electronic ink displays,
thin film batteries, and flexible electronics
• Integrated nanosensors: – Collecting, processing and communicating
data with minimal size, weight, and power consumption
Clothing/Film Products
• Color-changing fabrics
• Breathable waterproof ski jacket
• Wrinkle-resistant, stain-repellent threads
• Nanofilms are used now on eyeglasses, computer displays, and cameras to protect or treat the surfaces.
Health and Medicine Products
• Bandages embedded with silver nanoparticles – kill bacteria
• Drug delivery via a patch• Thin films on implantations into the human
body (for example screws, joints, and stents) allowing devices to last longer
• Respiration monitors that are many times more sensitive
• Nano-skin for skin graft applications
Health
• Nanocrystalline Sunscreen– Zinc oxide provides broad-spectrum
protection against UVA and UVB rays– Main ingredient is Z-COTE– Made with nanotechnology . . . Nano-
dispersed zinc oxide. . . . Goes from a white color to clear
Energy
• Energy Production: Clean, less expensive sources– Solar energy: Photovoltaic cells– Better Energy Utilization– Materials of construction sensing
changing conditions and in response, altering their inner structure
Environmental
• Environmental cleanup– Filters built out of carbon nanotubes, – Antifouling filters – Sieves that can filter bacteria and
poliovirus particles out of drinking water
Sports Products
• Tennis rackets – Nanotube Power and VS Nanotube Drive lightweight
• Tennis balls– Wilson Double Core tennis balls
• NanoDynamics golf ball – This ball is engineered with nanoparticles to spin less to
reduce the slice/hook problems
• Stronger golf clubs
• More accurate bowling balls
Potential Military NT(DARPA)
• Rugged/Embedded/Interlinked low-energy nanosensors to create pervasive networks
• Monitor for chemical & biological agents
• Implanted sensors for identification and health
Potential Military NT(DARPA)
• Nanofiber composites– Heat resistant, lighter and stronger– Cloaking devices
– Fuel Cells (H2 –storage) electric vehicles
• Strengthening of light armor• Better autonomous vehicles
– (combination of small electronics and nanofiber composites)
Potential Military NT(DARPA)
• Propellants and explosives with higher energy density
• Miniaturized guidance systems
Everything is great?
• Fears of Gray Goo
• Fears from “Prey”
• Comparisons of nano to biotech
• Generally no knowledge of environmental fate
• No data to back claims on either side of the argument
Exposure Routes
• Nanomaterials in clothing (uniforms) and equipment break off and enter the body and environment
• Nanoparticles as surface coverings erode and enter environment
• Nano-based fuels/explosives/ cloaking agents create residuals
A Nanomaterials Fate?
Introduction
Volatilization
Runoff
Leaching
Drainage -- Tile Flow
Degradation
DriftUptake
Sorption
Question: Is C60 is impacting the microbiology in the soil food web?
26
http://www.blm.gov/nstc/soil/bacteria/index.html
The talk presents the findings from a number of ongoing projects
27
Soils Work
Biosolids Work
Fungal Work
Typical Midwest Soils and chemical C60 preparations methods are established.
28
Texture
Name OM Sand Silt Clay
% pH %
Drummer 3.6 6 17 52 31
Tracy 1.5 5.5 55 37 8
Formation: Deguchi, et al., 2001
Concentration: Fortner et al., 2005
Size: DLS system
Our chosen soil microbiology methods are well established and documented
29
Microbial Form (PLFA/PCR-DGGE)Three domains model
Functions (CO2 CH4)
Size (Biomass)
Glucose Assimilation (14C-CO2)
Fungal Abilities (13C)
Evaluate Microbial Systems
C60 and nC60 had little impact on soil functions
Soil Respiration Biomass Size
30
Time (Days)
0 5 10 15 20 25 30 35
Cum
ulat
ive
CO
2 (
mg
CO
2 g
-1 so
il)
0.0
0.5
1.0
1.5
2.0
2.5
Soil THF nC60
C60
nC60 1 ppm / C60 1000 ppm – Drummer Soil
6-months
Soil-C THF-C C60 nC60
0
5
10
15
20
25
30
35
PL
PO
4 n
mo
l g-1 d
ry s
oil
No impact from longer incubations – Glucose assimilation testing method establishedTest procedure Response
31
Soil Challenged Soil Incubated Soil Tested
NanoMaterial
Time
Soil
14C-Glucose
14C-CO20 10 20 30 40 50 60 70
0
5
10
15
20
25
14C
O2
prod
uctio
n (%
of a
pplie
d 14
C-g
luco
se)
Time (h)
Soil-C THF-C C
60
nC60
Microbial profiling showed no difference after six months
32
M M Soil-C THF-C C60 nC60
Principal Componet 1( 58% of total variance)
-4 -3 -2 -1 0 1 2 3
Princi
pal C
om
ponent
2 (
19%
of
tota
l variance
)
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
C60
Soil
THFnC60
Fig. B
Principal Componet 1 (53% of total variance)
-4 -3 -2 -1 0 1 2 3
Princi
pal C
om
ponet
2 (
21%
of
tota
l variance
)
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
C60
Soil
nC60
THF
Fig. A
DGEE – 6 months PLFA 3 or 6 Months
Combinations of fullerenes with soil water stress show no effects
Five water potentials
Two nano materials
(nC60, C60, C12)
Two Soils
Respiratory response
33
Microbial activity measured as14CO2 evolved from 14C-glucose
treated soil exposed to nC60.
0 10 20 30 40
Cum
ula
tive 14 C
O2
evo
lve
d
(norm
aliz
ed
to c
on
trols
)
0
20
40
60
80
100
0.01 MPa0.03 MPa0.1 MPa0.5 MPa1.5 MPa
Drummer soil
Time (days)
0 10 20 30 40 50
Cum
ula
tive 14 C
O2
evo
lve
d
(norm
aliz
ed
to c
on
trols
)
0
20
40
60
80
100
Tracy soil
Soil diversity showed effects from C60 combined with water potential
Fatty Acids patterns from soils with nanomatrials and under water stresses (each symbol has an associated water potential)
34
PCA developed from FAMEs for treated and untreated soil.PC-1
-0.3 -0.2 -0.1 0.0 0.1 0.2 0.3
PC
-2
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
Tracy Soil
Drummer Soil
Drummer nC60 controlDrummer nC60 treatedDrummer C60 controlDrummer C60 treatedDrummer C12 controlDrummer C12 treated
Tracy nC60 controlTracy nC60 treatedTracy C60 controlTracy C60 treatedTracy C12 controlTracy C12 treated
Preliminary data suggests nC60 crystal size had no effect on soil response
40 50 60 70 80 90 100 1100
2
4
6
8
10
12
14
16
18
Fre
qu
en
cy (
%)
Particle Diameter (nm)
Average Size 51 nm
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
Soil nC60-250nm
nC60-108nm
nC60-78nm
nC60-51nm
THF-C
% o
f ap
plie
d 14C
-glu
cose
0.00
5.00
10.00
15.00
20.00
25.00
30.00
Soil nC60-250nm
nC60-108nm
nC60-78nm
nC60-51nm
THF-C
% o
f ap
plie
d 14 C
-glu
cose
nC60 formed in different size classes (mixing speed) added to soil
Respiratory response
after 30 day exposure
Assessing the Impact of Nanomaterials on Anaerobic
Microbial Communities
Environmental Receptor: The Wastewater Treatment Plant
http://www.waterencyclopedia.com/images/wsci_04_img0570.jpg
Objectives and Hypotheses
• Objective I.
• Examine the effect of C60 on an anaerobic community.
• Hypothesis I. – C60 will remain inert and exert no detectable
toxic effects on anaerobic communities. Methanogenesis (community function) will be unaffected by treatment with C60.
Objectives and Hypotheses
• Objective II. • Develop Three-Domain Community
Analysis
• Hypothesis II. – Three-Domain Community Analysis will detect
shifts in anaerobic communities more completely than the more widely used analysis of community structure in a single domain.
Community Function Measured by Anaerobic Toxicity Assay
+/- Substrate:
C6H12O6
CH3OH
CH3CH2OH
(G/M/E)
Concentration – Dependent Antibiotic Toxicity
0
20
40
60
80
100
120
140
160
0 10 20 30 40 50 60 70 80
Time (days)
Vo
lum
e (
mL
)
- G/M/E reference. - 2 mg/L metronidazole + G/M/E. - 200 mg/L metronidazole + G/M/E.
C60 Did Not Inhibit Gas Formation
0
100
200
300
400
500
600
0 50 100 150
time (days)
Ga
s V
olu
me
(m
l)
- G/M/E Substrate Reference
- C60 dissolved in MeOH/EtOH + G/M/E
▬ - aqeuous suspension C60 + G/M/E
▲- C60 dissolved in toluene, plated on dried sludge + G/M/E
Antibiotic treatment induced communi
ty chagnes shifts in all three domains R1 M1 R2 M2
R1 m M1
R1 R2 R2*M1 M2 M2*
Archaea Eukarya Bacteria
C60 did not affect Archaeal Community Profile
A B C H1 D F G H2
Increasing % G+C
Denaturing gradient gel electrophoresis with Archaea primers, showing similar community profiles at the end of each experiment for treated samples and reference samples.
No Bacterial
Community Shifts with C60
treatment
A B C H1 D F G H2
Increasing % G+C
DGGE with Bacteria primers, showing similar community profiles at the end of each experiment for treated samples and reference samples.
Conclusions and Significance
• No evidence of C60 toxicity to any subset of the microbial community, No evidence of major community shifts
• No methods for measurement of nanomaterials or products in the environment, nano risk assessment not yet standardized
• Important role for analysis of microbial community structure and function
• Long-term studies of C60 in the environment will be necessary to determine biodegradation potential
Outreach
• Mission (objectives) of the outreach program are helping the general public, especially high school students, understand the science behind the manufactured nanoparticles.
• www.purdue.edu/ANE
Outreach
www.purdue.edu/ANE