Characterization of the surface properties of nanoparticles using moisture adsorption dynamic profiling

Wang, Hao; Yao, Junpin; Shadman, Farhang

doi:10.1016/j.ces.2011.02.057

Cited by 4 publications

(2 citation statements)

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“…During the purge process, immediately after the switch to purge phase, the disappearance of the main sharp stretching band of water vapor around 3,800 cm −1 indicates that most of the moisture in the bulk flow was removed after switching to purge phase . As Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The method and most of the comparative conclusions would be valid for other similar sorbates when comparing NPs of different materials and sizes at different temperatures. The unique aspect of the experimental technique is the measurement of both surface and gas‐phase concentrations of adsorbate simultaneously, and the effect of the gas phase moisture was eliminated in the later study . Atmospheric pressure ionization mass spectrometer (APIMS), and cavity ring‐down spectrometer (CRDS), were used for measuring the concentration of contamination in the background gas phase.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Effect of particle size on the adsorption and desorption properties of oxide nanoparticles

Wang

Shadman

2012

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Using water molecules as a model adsorbing compound, the effect of particle size on the adsorption and desorption properties of porous oxide nanoparticles (NPs) was investigated at different temperatures. The moisture concentration on the surface of NPs was measured by monitoring the infrared spectra peaks corresponding to the stretching vibration of water molecules. A transient multilayer model was developed to represent the fundamental steps in the process. The thermal stability of adsorbed species and the strength of bonding to the surface were evaluated by determining the activation energies of various steps. The results indicate that the surface interaction parameters are both temperature and particle-size-dependent. Smaller NPs have a higher saturated surface concentration and a slower response to purging and desorption. As temperature decreases, NPs exhibit a higher saturated moisture concentration and are more prone to the adsorption of moisture and similar contaminants.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%