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Nanoparticles: Sources, Monitoring Methods, and Potential Health Impacts
Yevgen Nazarenko, Ph.D.,
Advisor and Mentors: Prof. Gediminas “Gedi” Mainelis,
Prof. Paul J. Lioy
Bioaerosol Research Laboratory
Department of Environmental Sciences
Rutgers, the State University of New Jersey
14 College Farm Road
New Brunswick, NJ 08901
Tel.: +1 (732) 470-0201
Fax: +1 (732) 932-8644
E-mail: [email protected]
Research Collaborators: Huajun Zhen, M.S., Taewon Han, Ph.D., Leonardo Calderon, M.S.
Classification of Nanoparticles
Main Figure adapted from B. Nowack, T.D. Bucheli / Environmental Pollution 150 (2007) 5-22 http://www.aquadyntech.com/h2omolecule.jpg
0.3 nm
1 – 100 nm in Perspective
http://images.wikia.com/gcse/images/d/d5/Glucose.png http://www.pdbj.org/eprots/images/2ODJ/2ODJ1.jpg http://www.dreamstime.com/influenza-flu-virus-structure-thumb9252986.jpg
1 nm
Glucose
10 nm
100 nm
Influenza A Virus
Nano-sized Particles and Materials
http://covers.elsevier.com/tango2/large/9781455778621.jpg http://www.azonano.com/images/sales/ImageForSaleItem_321.jpg http://books.gigaimg.com/avaxhome/33/5b/000a5b33_medium.jpeg http://cache.jalopnik.com/assets/images/12/2005/05/nanotech.gif http://cloudfront.dailybooth.com/12/pictures/large/eeadb82edfce447e9727ee219b013413_23091167.jpg http://topicden.com/wp-content/uploads/2010/06/nanotech.jpg http://bir-consulting.com/images/Picture-of-the-day/JB-inside-box.jpg http://2.bp.blogspot.com/_fLp_r2HnoyI/Sp_BJfrf1gI/AAAAAAAAARo/Zx_gVzygFho/s400/Nanotechnology+in+the+center+of+public+debate. jpg
Under “Regulation of the European Parliament and of the Council on Cosmetic Products” “Nanomaterial" means an insoluble or biopersistant and intentionally manufactured material with one or more external dimensions, or an internal structure, on the scale from 1 to 100 nm.
The US National Nanotechnology Initiative (NNI) defines nanotechnology as “the understanding and control of matter at dimensions between approximately 1 and 100 nanometers, where unique phenomena enable novel applications” (National Science and Technology Council, 2007).
Nano-sized Particles and Materials
• Naturally occurring nanoparticles and nanostructures
• Engineered nanoparticles and nanostructures
• Nanoparticle-contaning or nanostructured larger particles, agglomerates
• Complex substances and materials without a concrete chemical or physico-chemical identity
http://www.newhavenindependent.org/index.php/archives/entry/exposed_to_nano_exhale/
More Specific Definition of Nano
Nano-object – material with one, two or three external dimensions in the size range of approximately 1 – 100 nm
Nanoplate – nano-object with one external dimension of 1 – 100 nm
Nanofiber – nano-object with two external dimensions of 1 – 100 nm
Nanotube – a hollow nanofiber
Nanorod – a solid nanofiber
Nanoparticle – nano-object with all of the three external dimensions of 1 – 100 nm
Nanomaterial – any kind of nano-objects in the pure form or incorporated into a larger matrix or substrate
ISO/TS 27687:2008
“Nanotechnologies – Terminology and definitions for nano-objects – Nanoparticle, nanofibre and nanoplate”
What do Nanomaterials look like?
Nanoparticles ≠ Nanomaterial
Nano-objects can exist both as free nanoparticles and their
agglomerates or attached to larger particles
Sample 1 Sample 2
What do Nanomaterials look like?
In-house Synthesized Pure Silver Nanoparticles
Sources of Nanoparticles in the Atmosphere
Biosphere;
Volcanic eruptions and other geological processes;
Road traffic – both diesel and petrol-fuelled vehicles;
Stationary combustion sources;
Industrial emissions including nanomaterial manufacturing;
Homogeneous nucleation (nucleation without homogeneous nucleation sites);
Sources of Nanoparticles in the Atmosphere
Los Angeles Smog
Buzea, C., Pacheco, I.I., Robbie, K. 2007. Nanomaterials and nanoparticles: Sources and toxicity. Biointerphases, 2(4): MR17-MR172; http://www.epa.gov/airtrends/aqtrnd04/pmreport03/pmunderstand_2405.pdf, Accessed 13, August 2012
Size Distribution and aerosol composition over Los Angeles during 2002-2003
Sources of Nanoparticles in the Atmosphere
VOCs are oxidized by O3, OH and NO3 etc., and the resulting gaseous products condense into (homogeneous nucleation) and onto (heterogeneous nucleation) particles.*
*Riipinen, I., Yli-Juuti, T., Pierce, J. R., Petaja, T., Worsnop, D. R., Kulmala, M., Donahue, N. M. 2012. The contribution of organics to atmospheric nanoparticle growth. Nature Geoscience: 5: 453–458.
Sources of Nanoparticles Indoors
Afshari A., Matson U., Ekberg L. E. 2005. Characterization of indoor sources of fine and ultrafine particles: a study conducted in a full-scale chamber Indoor Air 15 141-150
Nanomaterial emissions indoors from industrial processes including nanomaterial and nanotechnology-based product manufacturing – lead to occupational exposure
Nanomaterials in Terrestrial and Aquatic Environments
Batley, G. E., Kirby, J. K., McLaughlin, M. J. Fate and Risks of Nanomaterials in Aquatic and Terrestrial Environments. Accounts of Chemical Research: Online 3, July 2012. DOI: 10.1021/ar2003368.
Fate and Transformations of Nanomaterials in the Environments
Health Concerns of Nanomaterial Exposure
Example 1: graphite-derived carbon nanoparticles (median diameter 36 nm) were found to translocate from the respiratory system to the olfactory bulb of the rat central nervous system. The same effect was found for the manganese oxide nanoparticles (median diameter 30 nm) with resulting inflammatory changes*
At the nanoscale, toxicity and associated biological and health effects of chemically the same substance may differ substantially depending on its size distribution and structural state
*Elder A, Gelein R, Silva V, Feikert T, Opanashuk L, Carter J, et al. 2006. Translocation of Inhaled Ultrafine Manganese Oxide Particles to the Central Nervous System. Environmental Health Perspectives 114(8): 1172-1178; Buzea, C., Pacheco, I.I., Robbie, K. 2007. Nanomaterials and nanoparticles: Sources and toxicity. Biointerphases, 2(4): MR17-MR172;
Health Concerns of Nanomaterial Exposure
Example 2: following intranasal instillation, a more intense inflammation response resulted in mice exposed to 21-nm anatase/rutile nano-TiO2 compared to 5-nm anatase nano-TiO2.*
Differences in nanomaterial toxicity can be profound even for small variations of particle size, including within the 1 – 100 nm range:
*Grassian VH, Adamcakova-Dodd A, Pettibone JM, O'Shaughnessy PT, Thorne PS. 2007. Inflammatory response of mice to manufactured titanium dioxide nanoparticles: Comparison of size effects through different exposure routes. Nanotoxicology 1(3): 211-226; Buzea, C., Pacheco, I.I., Robbie, K. 2007. Nanomaterials and nanoparticles: Sources and toxicity. Biointerphases, 2(4): MR17-MR172.
Health Concerns of Nanomaterial Exposure
Differences and similarities between carbon nanotubes and asbestos fibers during mesothelial carcinogenesis: Shedding light on fiber entry mechanism
Cancer Science Volume 103, Issue 8, pages 1378-1390, 14 JUN 2012 DOI: 10.1111/j.1349-7006.2012.02326.x http://onlinelibrary.wiley.com/doi/10.1111/j.1349-7006.2012.02326.x/full#cas2326-fig-0001
Human
exposure to
nanomaterials is
associated with
potential
health risks;
Different routes
of this exposure
are possible,
e.g. ingestion,
dermal,
inhalation
Human Exposure to Nanoparticles
Nanotechnology Safety • Of benefit to all stakeholders
including developers and product manufacturers and the government;
• Essential for the public including the end consumers and workers subject to occupational exposure
• Crucial for environmental safety
http://static.guim.co.uk/sys-images/Guardian/Pix/commercial/2011/11/24/1322140230930/Scientists-at-work-in-a-n-007.jpg http://cdn.dipity.com/uploads/events/e5d97506ae3cf4ed825b15b9c3be820b_1M.png http://ecx.images-amazon.com/images/I/51EpMZE4qQL._BO2,204,203,200_PIsitb-sticker-arrow-click,TopRight,35,-76_AA300_SH20_OU01_.jpg http://ecx.images-amazon.com/images/I/51RQAHzYRTL._SL500_AA300_.jpg http://www.nanowerk.com/nanotechnology/reports/reportpic/report116_l.jpg http://www.nanotortlaw.com/files/Uploads/Images/int84D.JPG http://www.nanotechproject.org/process/assets/images/6704/taylor_gma_pen_packaging_1.jpg http://images.amazon.com/images/P/0071477500.jpg http://www.hpcimedia.com/images/website/ManChemTechnical/DIR_4/F_9278.jpg
Nanotechnology Safety – in the US • 2011 NNI Environmental, Health, and
Safety (EHS) Research Strategy:
“a comprehensive approach to ensuring the safe, effective, and responsible development and use of nanotechnology”.
http://www.nano.gov/node/681 http://nanopatentsandinnovations.blogspot.com/2011/10/federal-government-releases.html
Nanotechnology Safety – in the EU
This Legislation is the first regulation ever to establish rules of use of engineered nanomaterials in products of any type
Regulation of the European Parliament and of the Council on Cosmetic Products, PE-CONS 3623/09 (2009)*
* Published online: http://register.consilium.europa.eu/pdf/en/09/st03/st03623.en09.pdf
Nanomaterial Sampling
Aerosol Inlet
Bukowiecki, N., Dommen, J., Prévôt, A.S.H., Richter, R., Weingartner, E., Baltensperger, U. 2002. A mobile pollutant measurement laboratory—measuring gas phase and aerosol ambient concentrations with high spatial and temporal resolution. Atmospheric Environment: 36(36-37): 5569–5579.
A Mobile Measurement Laboratory
Nanomaterial Sampling
Tsai, C.-J., Liu, C.-N.,Hung, S.-M., Chen, S.-C., Uang, S.-N., Cheng, Y.-S., Zhou, Y. 2012. Novel Active Personal Nanoparticle Sampler for the Exposure Assessment of Nanoparticles in Workplaces. Environmental Science and Technology: 46(8): 4546–4552.
A Personal Nanomaterial Sampler Collects both respirable PM (cutoff dae = 4µm) and nanopaprticles (cutoff dae = 100nm)
Mannequin Sampling
for Realistic Personal
Exposure Assessment
Nanomaterial Sampling
Nanomaterial Sampling
Thayera, D., Koehlerb, K. A., Marchesea, A., Volckens, J. 2011. Personal, Thermophoretic Sampler for Airborne Nanoparticles. Aerosol Science and Technology: 45: 734–740.
Thermophoretic Aerosol Sampler
Nanomaterial Sampling
http://www.grimm-aerosol.com
Electrostatic Nanoparticle Precipitator
Nanomaterial Analysis Techniques
Transmission Electron Microscopy
Scanning Electron Microscopy (SEM)
Energy Dispersive Spectroscopy (EDS)
Selected Area Electron Diffraction (SAED)
Aerosol Mass Spectrometry (AMS) for particle elemental analysis
Transmission and other kinds of Electron Microscopy can be used to study
nanoparticle size, shape, and agglomeration of nanomaterials including those
collected from ambient air in industrial and home spaces as well as outdoors
Methodology of Nanomaterial Analysis
Image from: http://www.virginia.edu/ms/images/JEOL2010.jpg Image from: http://nobelprize.org/educational_games/physics/microscopes/tem/index.html
Challenges when analyzing nanomaterials:
- Low electron-contrast particles (many organic and light-element materials) are invisible!
- Radiolysis – alteration of physico-chemical nature of certain material/particles by the
energetic electron beam.
Spatial or three-dimensional configuration of the particles and agglomerates
SEM Other Potential Measurement Techniques II
http://www.purdue.edu/rem/rs/sem.htm http://cermetmaterials.com/7558.html
Scan
nin
g El
ectr
on
Mic
rosc
op
y
Atomic composition of individual particles;
Elemental mapping of particles
EDS Other Potential Measurement Techniques III
http://www.aspexcorp.com/Solutions/OmegaMaxtrade/EDXSpectroscopy.aspx
Ener
gy D
isp
ersi
ve S
pe
ctro
sco
py
Crystalline structure of particles;
Allows identification of:
• Certain chemical compounds and/or mineral types (crystal structures) of the same compounds, e.g. rutile or anatase forms of titanium dioxide (TiO2)
SAED Other Potential Measurement Techniques IV
http://www.slh.wisc.edu/wohl/wohlworks/analysis_inorganic/36.dot http://www.nrel.gov/pv/measurements/transmission_microscopy.html
Sele
cted
Are
a El
ectr
on
Dif
frac
tio
n
Other Potential Measurement Techniques V
Near real-time chemical analysis of aerosol particles simultaneously with their size characterization;
Chemical identities of individual aerosol particles can be determined
AMS
http://cires.colorado.edu/~jjose/amsanimation.gif http://ahorrey.com/?action-viewnews-itemid-35848
Aer
oso
l Mas
s Sp
ect
rom
etry
Example Results of TEM Analysis
Sample 1
Sample 2
Aerosol Measurement Techniques
High importance of nanomaterials in all size fractions (both 1 – 100 nm and above in the agglomerated form) → we need to use more than one measurement technique, e.g. SMPS and APS
http://www.tsi.com/ProductView.aspx?id=21939 http://www.tsi.com/ProductView.aspx?id=23007
Example Results of SMPS, APS Analysis
Wide particle size distributions in the aerosol (airborne phase)
Sample 2 Sample 1
Primary Nanoparticle Size ≠ Aerosol Particle Size
In aerosol, nanomaterials are likely distributed in particles across a particle size range extending beyond 1 – 100 nm up to supercoarse particles (10 – 20 µm)
Challenges of Combined Use of Several Aerosol Measurement Techniques
SMPS measurements are based on the electrical properties of particles
APS measurements are based on the aerodynamic properties of particles
The different detection principles can result in different detection efficiency
This effect is often seen in the transition size range (0.5–0.7 µm) depending on various aerosol characteristics
TSI offers Merge Software to combine SMPS and APS measurements
A range of particle parameters including density and shape factor are required
Presenting the data as is – is an option: unaltered SMPS and APS size distributions
Challenges of Combined Use of Several Aerosol Measurement Techniques
Diverse range of particle materials and types in the aerosols derived from consumer products
Requires
?
Conclusions Nanoparticles are ubiquitous indoors and outdoors and include
engineered as well as incidental ultrafine particles, e.g., from combustion
sources;
Exposure to ultrafine including engineered nanoparticles causes adverse
health effects;
Regulation of nanomaterials will greatly expand;
Existing sampling and analytical techniques do allow collection and
characterization of ultrafine particles including engineered nanomaterial
particles;
The particle size distributions are different in: (1) the original nanomaterial
preparation, (2) a nanotechnology-based product that incorporates
nanomaterial(s), and (3) the derived aerosol causing exposure;
At this point, especially for the ambient ultrafine aerosols, it is a challenge
for the existing analytical techniques to identify certain nanoparticles or
distinguish between engineered nanoparticles and incidental ultrafine
particles.
Questions?