@article {97,
	title = {Water adsorption constrained Frenkel-Halsey-Hill adsorption activation theory: Montmorillonite and illite.},
	journal = {Atmospheric Environment},
	volume = {87},
	year = {2014},
	note = {CAPLUS AN 2014:435046(Journal; Online Computer File)},
	pages = {26 - 33},
	publisher = {Elsevier Ltd.},
	abstract = {Fresh mineral aerosol has recently been found to be effective cloud condensation nuclei (CCN) and contribute to the no. of cloud droplets in the atm. due to the effect of water adsorption on CCN activation.  The work described here uses exptl. water adsorption measurements on Na-montmorillonite and illite clay to det. empirical adsorption parameters that can be used in a recently derived theor. framework (Frenkel-Halsey-Hill Activation Theory, FHH-AT) that accounts for the effect of water adsorption on CCN activation.  Upon fitting the Frenkel-Halsey-Hill (FHH) adsorption model to water adsorption measurements, we find FHH adsorption parameters, A and B, to be 98 {\textpm} 22 and 1.79 {\textpm} 0.11 for montmorillonite and 75 {\textpm} 17 and 1.77 {\textpm} 0.11 for illite, resp.  The A and B values obtained from water adsorption measurements differ from values reported previously detd. by applying FHH-AT to CCN activation measurements.  Differences in FHH adsorption parameters were attributed to different methods used to obtain them and the hydratable nature of the clays.  FHH adsorption parameters detd. from water adsorption measurements were then used to calc. the crit. super-satn. (s) for CCN activation using FHH-AT.  The relationship between s and the dry particle diam. (D) gave CCN activation curve exponents (x) of -0.61 and -0.64 for montmorillonite and illite, resp.  The x values were slightly lower than reported previously for mineral aerosol.  The lower exponent suggests that the CCN activity of hydratable clays is less sensitive to changes in D and the hygroscopicity parameter exhibits a broader variability with D compared to more sol. aerosols.  Despite the differences in A, B and x, the FHH-AT derived CCN activities of montmorillonite and illite are quite similar to each other and in excellent agreement with exptl. CCN measurements resulting from wet-generated clay aerosol.  This study illustrates that FHH-AT using adsorption parameters constrained by water adsorption is a simple, valid method for predicting CCN activation of fresh clay minerals and provides parameters that can be used in atm. models to study the effect of mineral dust aerosol on cloud formation and climate. [on SciFinder(R)]},
	keywords = {dust montmorillonite illite water adsorption activation cloud condensation nuclei},
	isbn = {1352-2310},
	author = {Hatch, Courtney D. and Greenaway, Ann L. and Christie, Matthew J. and Baltrusaitis, Jonas.}
}
@article {106,
	title = {Horizontal Attenuated Total Reflectance Fourier Transform Infrared and X-ray Photoelectron Spectroscopy Measurements of Water Adsorption on Oxidized Tin(II) Sulfide (SnS) Surfaces.},
	journal = {Journal of Physical Chemistry C},
	volume = {117},
	year = {2013},
	note = {CAPLUS AN 2012:1849049(Journal; Online Computer File)},
	pages = {472 - 482},
	publisher = {American Chemical Society},
	abstract = {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{\textquoteright}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 ( > 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)]},
	keywords = {horizontal attenuated total reflectance FTIR XPS, water adsorption oxidized tin sulfide surface},
	isbn = {1932-7447},
	author = {Hatch, Courtney D. and Christie, Matthew J. and Weingold, Robert M. and Wu, Chia-Ming and Cwiertny, David M. and Baltrusaitis, Jonas.}
}
