@article {54,
	title = {Hematite decorated multi-walled carbon nanotubes (α-Fe2O3/MWCNTs) as sorbents for Cu(II) and Cr(VI): comparison of hybrid sorbent performance to its nanomaterial building blocks.},
	journal = {RSC Advances},
	volume = {6},
	year = {2016},
	note = {CAPLUS AN 2016:1655141(Journal; Online Computer File)},
	month = {2016},
	pages = {99997 - 100007},
	publisher = {Royal Society of Chemistry},
	abstract = {Major hurdles in the application of engineered nanomaterials for water treatment include loss of reactive surface area arising from particle aggregation and the development of application platforms that limit their potential release into the treated water supply.  Here, we develop hybrid nanostructures through the growth of hematite (α-Fe2O3) nanoparticles, which are recognized sorbents for various heavy metals, on multi-walled carbon nanotubes (MWCNTs).  The hybrid nanostructures were synthesized via hydrolysis of ferric nitrate in the presence of carboxylated MWCNTs, and their activity as sorbents toward Cu(II) and chromate (CrO42-) was examd. as a function of pH (i.e., pH-edge expts.) and initial metal concn. (i.e., adsorption isotherms).  Characterization of α-Fe2O3/MWCNT nanostructures via Raman spectroscopy and transmission electron microscopy (TEM) with selected area electron diffraction (SAED) confirmed the deposited iron phase as α-Fe2O3.  Further, complementary acid digestions and TEM imaging revealed that the amt. (0.1 and 0.5 g g-1 α-Fe2O3/MWCNT) and size [5.9 ({\textpm}1.1) and 8.9 ({\textpm}1.5) nm, resp.] of α-Fe2O3 nanoparticles immobilized on MWCNTs were tunable during synthesis.  Generally, mass-normalized concns. of adsorbed Cu(II) and CrO42- were greatest for α-Fe2O3/MWCNT hybrids relative to adsorption on either carboxylated MWCNTs or freely suspended α-Fe2O3 nanoparticles, with evidence implicating α-Fe2O3 as the active sorbent phase in hybrid materials.  Indeed, per unit mass of available α-Fe2O3, hybrid sorbents exhibited capacities comparable to or exceeding most other iron-based sorbents for Cu(II) and CrO42- (from 220 to 470 mg Cu(II) per g α-Fe2O3 and 60 mg CrO42- per g α-Fe2O3, resp., at pH 6 and 20 {\textdegree}C).  The enhanced sorption capacity of the hybrid nanostructures is due, at least in part, to the greater available surface area of α-Fe2O3 nanoparticles immobilized on MWCNTs when compared to their more extensively aggregated state in suspension.  Notable differences in the pH-dependent trends of Cu(II) and CrO42- uptake on α-Fe2O3/MWCNT hybrids, along with differences in zeta potential measurements across pH, also suggest that the immobilized α-Fe2O3 nanoparticles may exhibit unique surface reactivity relative to their freely suspended analogs as a result of their assocn. with the neg. charged MWCNT surface. [on SciFinder(R)]},
	keywords = {hematite MWCNT copper chromium hybrid sorbent nanomaterial building block},
	isbn = {2046-2069},
	author = {Verdugo, Edgard M. and Xie, Yang and Baltrusaitis, Jonas and Cwiertny, David M.}
}
@article {83,
	title = {Heterogeneous Reactivity of Nitric Acid with Nascent Sea Spray Aerosol: Large Differences Observed between and within Individual Particles.},
	journal = {Journal of Physical Chemistry Letters},
	volume = {5},
	year = {2014},
	note = {CAPLUS AN 2014:1085495(Journal; Online Computer File)},
	pages = {2493 - 2500},
	publisher = {American Chemical Society},
	abstract = {Current climate and atm. chem. models assume that all sea spray particles react as if they are pure NaCl.  However, recent studies of sea spray aerosol particles have shown that distinct particle types exist (including sea salt, org. C, and biol. particles) as well as mixts. of these and, within each particle type, there is a range of single-particle chem. compns.  Because of these differences, individual particles should display a range of reactivities with trace atm. gases.  We studied the compn. of individual sea spray aerosol particles after heterogeneous reaction with nitric acid.  As expected, a replacement reaction of chloride with nitrate is obsd.; however, there is a large range of reactivities spanning from no reaction to complete reaction between and within individual sea spray aerosol particles.  These data clearly support the need for lab. studies of individual, environmentally relevant particles to improve our fundamental understanding as to the properties that det. reactivity. [on SciFinder(R)]},
	keywords = {heterogeneous reactivity nitrate nascent sea spray aerosol},
	isbn = {1948-7185},
	author = {Ault, Andrew P. and Guasco, Timothy L. and Baltrusaitis, Jonas and Ryder, Olivia S. and Trueblood, Jonathan V. and Collins, Douglas B. and Ruppel, Matthew J. and Cuadra-Rodriguez, Luis A. and Prather, Kimberly A. and Grassian, Vicki H.}
}
@article {104,
	title = {H2S-Mediated Thermal and Photochemical Methane Activation.},
	journal = {ChemPhysChem},
	volume = {14},
	year = {2013},
	note = {CAPLUS AN 2013:1649184(Journal)},
	pages = {3960 - 3970},
	publisher = {Wiley-VCH Verlag GmbH \& Co. KGaA},
	abstract = {Sustainable, low-temp. methods for natural gas activation are crit. in addressing current and foreseeable energy and hydrocarbon feedstock needs.  Large portions of natural gas resources are still too expensive to process due to their high content of hydrogen sulfide gas (H2S) mixed with methane, deemed altogether as sub-quality or "sour" gas.  We propose a unique method of activation to form a mixt. of sulfur-contg. hydrocarbon intermediates, CH3SH and CH3SCH3, and an energy carrier such as H2.  For this purpose, we investigated the H2S-mediated methane activation to form a reactive CH3SH species by means of direct photolysis of sub-quality natural gas.  Photoexcitation of hydrogen sulfide in the CH4 + H2S complex resulted in a barrierless relaxation by a conical intersection to form a ground-state CH3SH + H2 complex.  The resulting CH3SH could further be coupled over acidic catalysts to form higher hydrocarbons, and the resulting H2 used as a fuel.  This process is very different from conventional thermal or radical-based processes and can be driven photolytically at low temps., with enhanced control over the conditions currently used in industrial oxidative natural gas activation.  Finally, the proposed process is CO2 neutral, as opposed to the current industrial steam methane reforming (SMR). [on SciFinder(R)]},
	keywords = {hydrogen sulfide mediated thermal photochem methane activation CAM B3LYP},
	isbn = {1439-4235},
	author = {Baltrusaitis, Jonas and de Graaf, Coen and Broer, Ria and Patterson, Eric V.}
}
@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 {167,
	title = {Hymenopsins A and B and a macrophorin analog from a fungicolous Hymenopsis sp.},
	journal = {Journal of Natural Products},
	volume = {73},
	year = {2010},
	note = {CAPLUS AN 2009:1462186(Journal)},
	month = {2010///},
	pages = {404 - 408},
	publisher = {American Chemical Society-American Society of Pharmacognosy},
	abstract = {Hymenopsin A (1), hymenopsin B (2), and a new macrophorin analog, 2{\textquoteright},3{\textquoteright}-epoxy-13-hydroxy-4{\textquoteright}-oxomacrophorin A (3), have been isolated from a fungicolous isolate of Hymenopsis sp. (MYC-1703; NRRL 37638).  The structures and relative configurations of these compds. were assigned on the basis of 2D NMR and MS data, and the identity of 1 was confirmed by X-ray crystallog. anal.  The abs. configuration of 2 was proposed on the basis of CD anal. using both empirical and computational methods.  Compds. 2 and 3 showed antibacterial activity against Staphylococcus aureus and Bacillus subtilis.  Compd. 3 was also active against Aspergillus flavus and Fusarium verticillioides. [on SciFinder(R)]},
	keywords = {hymenopsin Hymenopsis},
	isbn = {0163-3864},
	author = {Schmidt, Lori E. and Deyrup, Stephen T. and Baltrusaitis, Jonas and Swenson, Dale C. and Wicklow, Donald T. and Gloer, James B.}
}
@article {191,
	title = {Heterogeneous uptake and reactivity of formic acid on calcium carbonate particles: a Knudsen cell reactor, FTIR and SEM study.},
	journal = {Physical Chemistry Chemical Physics},
	volume = {7},
	year = {2005},
	note = {CAPLUS AN 2005:1066074(Journal)},
	month = {2005///},
	pages = {3587 - 3595},
	publisher = {Royal Society of Chemistry},
	abstract = {The heterogeneous uptake and reactivity of formic acid (HCOOH), a common gas-phase org. acid found in the environment, on calcium carbonate (CaCO3) particles have been investigated using a Knudsen cell reactor, Fourier transform IR (FTIR) spectroscopy and SEM.  FTIR measurements show that the adsorption of formic acid on the surface of calcium carbonate results in the formation of calcium formate.  Besides calcium formate, carbonic acid is also a reaction product under dry conditions (<1\% RH).  Under dry conditions and at low pressures, the initial uptake coeff. of formic acid on CaCO3 particles is measured to be 3 {\textpm} 1 {\texttimes} 10-3 and decreases as the surface sats. with adsorbed products.  The max. surface coverage of formic acid under dry conditions is detd. to be (3 {\textpm} 1) {\texttimes} 1014 mols. cm-2.  Under humidified conditions (RH >10\%), adsorbed water on the surface of the carbonate particles participates in the surface reactivity of these particles, which results in the enhanced uptake kinetics and extent of reaction of this org. acid on CaCO3 as well as opens up several new reaction pathways.  These reaction pathways include: (i) the water-assisted dissocn. of carbonic acid to CO2 and H2O and (ii) the formation of calcium formate islands and crystallites, as evident by SEM images.  The results presented here show that adsorbed water plays a potentially important role in the surface chem. of gas-phase org. acids on calcium carbonate particles. [on SciFinder(R)]},
	keywords = {adsorption chemisorption formic acid calcium carbonate particle},
	isbn = {1463-9076},
	author = {Al-Hosney, Hashim A. and Carlos-Cuellar, Sofia and Baltrusaitis, Jonas and Grassian, Vicki H.}
}
