<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Verdugo, Edgard M.</style></author><author><style face="normal" font="default" size="100%">Xie, Yang</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Cwiertny, David M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">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.</style></title><secondary-title><style face="normal" font="default" size="100%">RSC Advances</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">hematite MWCNT copper chromium hybrid sorbent nanomaterial building block</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2016</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2016</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Royal Society of Chemistry</style></publisher><volume><style face="normal" font="default" size="100%">6</style></volume><pages><style face="normal" font="default" size="100%">99997 - 100007</style></pages><isbn><style face="normal" font="default" size="100%">2046-2069</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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 (±1.1) and 8.9 (±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 °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)]</style></abstract><issue><style face="normal" font="default" size="100%">102</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2016:1655141(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ault, Andrew P.</style></author><author><style face="normal" font="default" size="100%">Guasco, Timothy L.</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Ryder, Olivia S.</style></author><author><style face="normal" font="default" size="100%">Trueblood, Jonathan V.</style></author><author><style face="normal" font="default" size="100%">Collins, Douglas B.</style></author><author><style face="normal" font="default" size="100%">Ruppel, Matthew J.</style></author><author><style face="normal" font="default" size="100%">Cuadra-Rodriguez, Luis A.</style></author><author><style face="normal" font="default" size="100%">Prather, Kimberly A.</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Heterogeneous Reactivity of Nitric Acid with Nascent Sea Spray Aerosol: Large Differences Observed between and within Individual Particles.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry Letters</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">heterogeneous reactivity nitrate nascent sea spray aerosol</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">5</style></volume><pages><style face="normal" font="default" size="100%">2493 - 2500</style></pages><isbn><style face="normal" font="default" size="100%">1948-7185</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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)]</style></abstract><issue><style face="normal" font="default" size="100%">15</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2014:1085495(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Romao, Joana</style></author><author><style face="normal" font="default" size="100%">Barata, David</style></author><author><style face="normal" font="default" size="100%">Habibovic, Pamela</style></author><author><style face="normal" font="default" size="100%">Mul, Guido</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">High Throughput Analysis of Photocatalytic Water Purification.</style></title><secondary-title><style face="normal" font="default" size="100%">Analytical Chemistry (Washington, DC, United States)</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">photocatalysis wastewater kinetic decolorization</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">86</style></volume><pages><style face="normal" font="default" size="100%">7612 - 7617</style></pages><isbn><style face="normal" font="default" size="100%">0003-2700</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We present a novel high throughput photocatalyst efficiency assessment method based on 96-well microplates and UV-vis spectroscopy.  We demonstrate the reproducibility of the method using methyl orange (MO) decompn. and compare kinetic data obtained with those provided in the literature for larger conventional photoreactors.  To demonstrate the capabilities of the method, we rapidly screened the effects of salts, potentially present in wastewater, on kinetic rates of MO decompn. and discuss the obtained data on the basis of existing literature. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">15</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2014:1085617(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">de Graaf, Coen</style></author><author><style face="normal" font="default" size="100%">Broer, Ria</style></author><author><style face="normal" font="default" size="100%">Patterson, Eric V.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">H2S-Mediated Thermal and Photochemical Methane Activation.</style></title><secondary-title><style face="normal" font="default" size="100%">ChemPhysChem</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">hydrogen sulfide mediated thermal photochem methane activation CAM B3LYP</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">Wiley-VCH Verlag GmbH &amp; Co. KGaA</style></publisher><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">3960 - 3970</style></pages><isbn><style face="normal" font="default" size="100%">1439-4235</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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 &quot;sour&quot; 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)]</style></abstract><issue><style face="normal" font="default" size="100%">17</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2013:1649184(Journal)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Rubasinghege, Gayan</style></author><author><style face="normal" font="default" size="100%">Ogden, Saralyn</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">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.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry A</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">heterogeneous uptake adsorption gas phase formic acid oxide clay</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">117</style></volume><pages><style face="normal" font="default" size="100%">11316 - 11327</style></pages><isbn><style face="normal" font="default" size="100%">1089-5639</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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'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)]</style></abstract><issue><style face="normal" font="default" size="100%">44</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2013:1536458(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Hatch, Courtney D.</style></author><author><style face="normal" font="default" size="100%">Christie, Matthew J.</style></author><author><style face="normal" font="default" size="100%">Weingold, Robert M.</style></author><author><style face="normal" font="default" size="100%">Wu, Chia-Ming</style></author><author><style face="normal" font="default" size="100%">Cwiertny, David M.</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Horizontal Attenuated Total Reflectance Fourier Transform Infrared and X-ray Photoelectron Spectroscopy Measurements of Water Adsorption on Oxidized Tin(II) Sulfide (SnS) Surfaces.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Physical Chemistry C</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">horizontal attenuated total reflectance FTIR XPS</style></keyword><keyword><style  face="normal" font="default" size="100%">water adsorption oxidized tin sulfide surface</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">117</style></volume><pages><style face="normal" font="default" size="100%">472 - 482</style></pages><isbn><style face="normal" font="default" size="100%">1932-7447</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Tin(II) sulfide (SnS) is considered to be a promising optoelectronic material due to its narrow band gap, strong optical absorption, low cost and nontoxic and chem. inert characteristics.  As an inherently stable compd., SnS surfaces are expected to be hydrophobic by nature.  However, exposure of pristine SnS surfaces to air inevitably leads to surface oxidn. which can affect the mineral's dissoln., reactivity, optical and electronic properties as well as hydrophobicity.  In the present study, water adsorption measurements on oxidized SnS thin films were performed using horizontal attenuated total reflection Fourier transform IR (HATR-FTIR) spectroscopy.  XPS anal. allowed for characterization of the SnS surface compn. before water vapor exposure and identification of any changes that occurred to the surface after water vapor exposure.  XPS results are consistent with water adsorption occurring on SnS surfaces contg. hydroxyl and carbonate groups.  Addnl., XPS anal. showed that exposure of SnS to water vapor resulted in no significant changes to the original surface compn.  Quant. water adsorption measurements using HATR-FTIR spectroscopy show that the oxidized SnS surface exhibits a slightly hydrophilic nature, demonstrating multilayer water adsorption at high relative humidity (RH) values.  Exptl. water adsorption data were fit using the Brunauer-Emmett-Teller (BET) and Freundlich adsorption models.  From these model fits, details of monolayer water adsorption and the water adsorption mechanisms were extd. to provide a better understanding of gas/surface adsorption on oxidized SnS surfaces.  Results suggest that water adsorption on SnS powder occurs in three distinct regimes, including sub-monolayer water adsorption up to monolayer coverage at 13% RH, followed by filling of mesopores (13-76% RH) and finally multilayer water adsorption ( &gt; 76% RH) via filling of macropores.  This study represents the first report of in situ water adsorption measurements on SnS as a function of relative humidity, illustrating how oxidized surface species can alter the hydrophobic nature of SnS surfaces. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">1</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2012:1849049(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Chen, Haihan</style></author><author><style face="normal" font="default" size="100%">Rubasinghege, Gayan</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Heterogeneous Atmospheric Chemistry of Lead Oxide Particles with Nitrogen Dioxide Increases Lead Solubility: Environmental and Health Implications.</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental Science &amp; Technology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">air water soil pollution lead following nitrogen dioxide reaction</style></keyword><keyword><style  face="normal" font="default" size="100%">environmental health implication lead oxide reaction nitrogen dioxide</style></keyword><keyword><style  face="normal" font="default" size="100%">lead oxide particle heterogeneous atm chem</style></keyword><keyword><style  face="normal" font="default" size="100%">nitrogen dioxide reaction lead oxide particle increased lead soly</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2012///</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society</style></publisher><volume><style face="normal" font="default" size="100%">46</style></volume><pages><style face="normal" font="default" size="100%">12806 - 12813</style></pages><isbn><style face="normal" font="default" size="100%">0013-936X</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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)]</style></abstract><issue><style face="normal" font="default" size="100%">23</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2012:1499142(Journal; Online Computer File)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Schmidt, Lori E.</style></author><author><style face="normal" font="default" size="100%">Deyrup, Stephen T.</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Swenson, Dale C.</style></author><author><style face="normal" font="default" size="100%">Wicklow, Donald T.</style></author><author><style face="normal" font="default" size="100%">Gloer, James B.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Hymenopsins A and B and a macrophorin analog from a fungicolous Hymenopsis sp.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Natural Products</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">hymenopsin Hymenopsis</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2010///</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">American Chemical Society-American Society of Pharmacognosy</style></publisher><volume><style face="normal" font="default" size="100%">73</style></volume><pages><style face="normal" font="default" size="100%">404 - 408</style></pages><isbn><style face="normal" font="default" size="100%">0163-3864</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Hymenopsin A (1), hymenopsin B (2), and a new macrophorin analog, 2',3'-epoxy-13-hydroxy-4'-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)]</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2009:1462186(Journal)</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Al-Hosney, Hashim A.</style></author><author><style face="normal" font="default" size="100%">Carlos-Cuellar, Sofia</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Grassian, Vicki H.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Heterogeneous uptake and reactivity of formic acid on calcium carbonate particles: a Knudsen cell reactor, FTIR and SEM study.</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Chemistry Chemical Physics</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">adsorption chemisorption formic acid calcium carbonate particle</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2005</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2005///</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Royal Society of Chemistry</style></publisher><volume><style face="normal" font="default" size="100%">7</style></volume><pages><style face="normal" font="default" size="100%">3587 - 3595</style></pages><isbn><style face="normal" font="default" size="100%">1463-9076</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">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 (&lt;1% RH).  Under dry conditions and at low pressures, the initial uptake coeff. of formic acid on CaCO3 particles is measured to be 3 ± 1 × 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 ± 1) × 1014 mols. cm-2.  Under humidified conditions (RH &gt;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)]</style></abstract><issue><style face="normal" font="default" size="100%">20</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2005:1066074(Journal)</style></notes></record></records></xml>