@article {86,
	title = {Iron oxide nanoparticles induce Pseudomonas aeruginosa growth, induce biofilm formation, and inhibit antimicrobial peptide function.},
	journal = {Environmental Science: Nano},
	volume = {1},
	year = {2014},
	note = {CAPLUS AN 2014:465811(Journal; Online Computer File)},
	pages = {123 - 132},
	publisher = {Royal Society of Chemistry},
	abstract = {Given the increased use of iron-contg. nanoparticles in a no. of applications, it is important to understand any effects that iron-contg. nanoparticles can have on the environment and human health.  Since iron concns. are extremely low in body fluids, there is potential that iron-contg. nanoparticles may influence the ability of bacteria to scavenge iron for growth, affect virulence and inhibit antimicrobial peptide (AMP) function.  In this study, Pseudomonas aeruginosa (PA01) and AMPs were exposed to iron oxide nanoparticles, hematite (α-Fe2O3), of different sizes ranging from 2 to 540 nm (2 {\textpm} 1, 43 {\textpm} 6, 85 {\textpm} 25 and 540 {\textpm} 90 nm) in diam.  Here we show that the greatest effect on bacterial growth, biofilm formation, and AMP function impairment is found when exposed to the smallest particles.  These results are attributed in large part to enhanced dissoln. obsd. for the smallest particles and an increase in the amt. of bioavailable iron.  Furthermore, AMP function can be addnl. impaired by adsorption onto nanoparticle surfaces.  In particular, lysozyme readily adsorbs onto the nanoparticle surface which can lead to loss of peptide activity.  Thus, this current study shows that co-exposure of nanoparticles and known pathogens can impact host innate immunity.  Therefore, it is important that future studies be designed to further understand these types of impacts. [on SciFinder(R)]},
	keywords = {Pseudomonas iron oxide nanoparticle biofilm antimicrobial peptide},
	isbn = {2051-8161},
	author = {Borcherding, Jennifer and Baltrusaitis, Jonas and Chen, Haihan and Stebounova, Larissa and Wu, Chia-Ming and Rubasinghege, Gayan and Mudunkotuwa, Imali A. and Caraballo, Juan Carlos and Zabner, Joseph and Grassian, Vicki H. and Comellas, Alejandro P.}
}
@article {95,
	title = {Surface Photochemistry of Adsorbed Nitrate: The Role of Adsorbed Water in the Formation of Reduced Nitrogen Species on α-Fe2O3 Particle Surfaces.},
	journal = {Journal of Physical Chemistry A},
	volume = {118},
	year = {2014},
	note = {CAPLUS AN 2013:1898077(Journal; Online Computer File)},
	pages = {158 - 166},
	publisher = {American Chemical Society},
	abstract = {The surface photochem. of nitrate, formed from nitric acid adsorption, on hematite (α-Fe2O3) particle surfaces under different environmental conditions is investigated using XPS.  Following exposure of α-Fe2O3 particle surfaces to gas-phase nitric acid, a peak in the N1s region is seen at 407.4 eV; this binding energy is indicative of adsorbed nitrate.  Upon broadband irradn. with light (λ > 300 nm), the nitrate peak decreases in intensity as a result of a decrease in adsorbed nitrate on the surface.  Concomitant with this decrease in the nitrate coverage, there is the appearance of two lower binding energy peaks in the N1s region at 401.7 and 400.3 eV, due to reduced nitrogen species.  The formation as well as the stability of these reduced nitrogen species, identified as NO- and N-, are further investigated as a function of water vapor pressure.  Addnl., irradn. of adsorbed nitrate on α-Fe2O3 generates three nitrogen gas-phase products including NO2, NO, and N2O.  As shown here, different environmental conditions of water vapor pressure and the presence of mol. oxygen greatly influence the relative photoproduct distribution from nitrate surface photochem.  The atm. implications of these results are discussed. [on SciFinder(R)]},
	keywords = {surface photochem nitrate nitric acid adsorbate iron oxide particle},
	isbn = {1089-5639},
	author = {Nanayakkara, Charith E. and Jayaweera, Pradeep M. and Rubasinghege, Gayan and Baltrusaitis, Jonas and Grassian, Vicki H.}
}
@article {105,
	title = {Heterogeneous Uptake and Adsorption of Gas-Phase Formic Acid on Oxide and Clay Particle Surfaces: The Roles of Surface Hydroxyl Groups and Adsorbed Water in Formic Acid Adsorption and the Impact of Formic Acid Adsorption on Water Uptake.},
	journal = {Journal of Physical Chemistry A},
	volume = {117},
	year = {2013},
	note = {CAPLUS AN 2013:1536458(Journal; Online Computer File)},
	pages = {11316 - 11327},
	publisher = {American Chemical Society},
	abstract = {Org. acids in the atm. are ubiquitous and are often correlated with mineral dust aerosol.  Heterogeneous chem. and the uptake of org. acids on mineral dust particles can potentially alter the properties of the particle.  In this study, heterogeneous uptake and reaction of formic acid, HCOOH, the most abundant carboxylic acid present in the atm., on oxide and clays of the most abundant elements, Si and Al, present in the Earth{\textquoteright}s crust are investigated under dry and humid conditions.  In particular, quant. adsorption measurements using a Quartz Crystal Microbalance (QCM) coupled with spectroscopic studies using Attenuated Total Reflection Fourier Transform IR (ATR-FTIR) spectroscopy are combined to allow for both quantification of the amt. of uptake and identification of distinct adsorbed species formed on silica, alumina, and kaolinite particle surfaces at 298 K.  These oxides and clay particles show significant differences in the extent and speciation of adsorbed HCOOH due to inherent differences in surface -OH group reactivity.  Adsorbed water, controlled by relative humidity, can increase the irreversible uptake of formic acid.  Interestingly, the resulting layer of adsorbed formate on the particle surface decreases the particle hydrophilicity thereby decreasing the amt. of water taken up by the surface as measured by QCM.  Atm. implications of this study are discussed. [on SciFinder(R)]},
	keywords = {heterogeneous uptake adsorption gas phase formic acid oxide clay},
	isbn = {1089-5639},
	author = {Rubasinghege, Gayan and Ogden, Saralyn and Baltrusaitis, Jonas and Grassian, Vicki H.}
}
@article {135,
	title = {Heterogeneous Atmospheric Chemistry of Lead Oxide Particles with Nitrogen Dioxide Increases Lead Solubility: Environmental and Health Implications.},
	journal = {Environmental Science \& Technology},
	volume = {46},
	year = {2012},
	note = {CAPLUS AN 2012:1499142(Journal; Online Computer File)},
	month = {2012///},
	pages = {12806 - 12813},
	publisher = {American Chemical Society},
	abstract = {The heterogeneous chem. of NO2 with Pb-contg. particles was examd. to better understand Pb metal mobilization in the environment.  In particular, PbO particles, a model Pb-contg. compd. due to its widespread presence as a Pb paint and as naturally-occurring mineral (massicot, and litharge) component, were exposed to NO2 at different relative humidities.  XPS showed that upon exposure to NO2, the PbO particle surface reacts forming adsorbed NO3- and Pb(NO3)2 thin films; the extent of NO3- formation was relatively humidity dependent.  NO2-exposed PbO particles had an increased amt. of Pb which dissolved in aq. suspensions at circumneutral pH vs. unexposed particles.  Results identified the potential importance and impact that heterogeneous chem. with trace atm. gases can have on increasing soly. and hence the mobilization of heavy metals such as Pb in the environment.  Results also showed that surface intermediates which form, such as adsorbed Pb(NO3)2, can yield higher Pb concns. in water, including drinking, estuary, and lake water, and groundwater. [on SciFinder(R)]},
	keywords = {air water soil pollution lead following nitrogen dioxide reaction, environmental health implication lead oxide reaction nitrogen dioxide, lead oxide particle heterogeneous atm chem, nitrogen dioxide reaction lead oxide particle increased lead soly},
	isbn = {0013-936X},
	author = {Baltrusaitis, Jonas and Chen, Haihan and Rubasinghege, Gayan and Grassian, Vicki H.}
}
@article {141,
	title = {Preservation of York Minster historic limestone by hydrophobic surface coatings.},
	journal = {Scientific Reports},
	volume = {2},
	year = {2012},
	note = {CAPLUS AN 2013:60154(Journal; Online Computer File)},
	month = {2012///},
	pages = {srep00880, 5 pp.},
	publisher = {Nature Publishing Group},
	abstract = {Magnesian limestone is a key construction component of many historic buildings that is under const. attack from environmental pollutants notably by oxides of sulfur via acid rain, particulate matter sulfate and gaseous SO2 emissions.  Hydrophobic surface coatings offer a potential route to protect existing stonework in cultural heritage sites, however, many available coatings act by blocking the stone microstructure, preventing it from {\textquoteright}breathing{\textquoteright} and promoting mold growth and salt efflorescence.  Here we report on a conformal surface modification method using self-assembled monolayers of naturally sourced free fatty acids combined with sub-monolayer fluorinated alkyl silanes to generate hydrophobic (HP) and super hydrophobic (SHP) coatings on calcite.  We demonstrate the efficacy of these HP and SHP surface coatings for increasing limestone resistance to sulfation and thus retarding gypsum formation under SO2/H2O and model acid rain environments.  SHP treatment of 19th century stone from York Minster suppresses sulfuric acid permeation. [on SciFinder(R)]},
	keywords = {archaeol limestone preservation surface coating},
	isbn = {2045-2322},
	author = {Walker, Rachel A. and Wilson, Karen and Lee, Adam F. and Woodford, Julia and Grassian, Vicki H. and Baltrusaitis, Jonas and Rubasinghege, Gayan and Cibin, Giannantonio and Dent, Andrew.}
}
@article {144,
	title = {Surface Chemistry of α-FeOOH Nanorods and Microrods with Gas-Phase Nitric Acid and Water Vapor: Insights into the Role of Particle Size, Surface Structure, and Surface Hydroxyl Groups in the Adsorption and Reactivity of α-FeOOH with Atmospheric Gases.},
	journal = {Journal of Physical Chemistry C},
	volume = {116},
	year = {2012},
	note = {CAPLUS AN 2012:668168(Journal; Online Computer File)},
	month = {2012///},
	pages = {12566 - 12577},
	publisher = {American Chemical Society},
	abstract = {Heterogeneous interactions of H2O and HNO3 on goethite, α-FeOOH, a component of mineral dust aerosol, are studied with simultaneous QCM measurements and ATR-FTIR spectroscopy.  Lab. synthesized α-FeOOH of varying sizes (microrods and nanorods) when exposed to gas phase H2O and HNO3 results in the uptake of these gases.  This combined approach of QCM measurements and ATR-FTIR spectroscopy allows for both quantification of the amt. of uptake and spectroscopic data that provides information on speciation of adsorbed products.  In the case of H2O, both microrods and nanorods take up H2O and that the total amts. of H2O, when normalized to surface area, are similar.  However, for HNO3 uptake, the satn. coverage of total and irreversibly bound HNO3 on microrods is higher than that on nanorods, a size effect which is attributed to surface structural changes that occur as a function of particle size.  Also, a study of the behavior of HNO3 reacted with α-FeOOH in aq. media was carried out such as to better understand the effects of atm. processing upon dispersal within the hydrosphere. [on SciFinder(R)]},
	keywords = {iron hydroxide oxide nanorod microrod nitric acid water adsorption},
	isbn = {1932-7447},
	author = {Wijenayaka, Lahiru A. and Rubasinghege, Gayan and Baltrusaitis, Jonas and Grassian, Vicki H.}
}
@article {170,
	title = {Reactions on Atmospheric Dust Particles: Surface Photochemistry and Size-Dependent Nanoscale Redox Chemistry.},
	journal = {Journal of Physical Chemistry Letters},
	volume = {1},
	year = {2010},
	note = {CAPLUS AN 2010:616561(Journal; General Review; Online Computer File)},
	month = {2010///},
	pages = {1729 - 1737},
	publisher = {American Chemical Society},
	abstract = {A review concerning new mechanisms and reaction pathways identified in lab. studies of atm. mineral dust and nano-dust (potential new source of metal-contg. dust from engineered nano-materials) components, particularly surface photochem. and size-dependent, nano-scale redox chem. is given. [on SciFinder(R)]},
	keywords = {review airborne dust nanodust reaction, size depended nanoscale redox chem airborne dust review, surface photochem airborne dust nanodust review},
	isbn = {1948-7185},
	url = {http://pubs.acs.org/doi/pdfplus/10.1021/jz100371d},
	author = {Rubasinghege, Gayan and Elzey, Sherrie and Baltrusaitis, Jonas and Jayaweera, Pradeep M. and Grassian, Vicki H.}
}
