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Measurement of the association constants through micro-Raman spectra of supersaturated lithium perchlorate droplets

Science China Chemistry 2013年第11期56卷 1633-1640页

作者： GUO Xin tan seehua PANG ShuFeng ZHANG YunHong College of Sciences Central South University of Forestry and Technology The Institute of Chemical Physics School of ChemistryBeijing Institute of Technology

High quality micro-Raman spectra of the LiClO4 droplet with mass of nanogram scale were obtained at various concentrations from dilute to supersaturated state. From component band analysis of the v1-ClO4^- band, four peaks at 933.3, 936.8, 942.1 and 950.7 cm^-1 were identified and assigned to free solvated perchlorate anion, solvent-shared ion pair, contact ion pair and com- plex ion aggregates, respectively. As expected, the signature of free solvated CIO4 ion was observed to decrease in intensity with the increase in concentration. The intensity of the signature from solvent-shared ion pair was observed to rise with in- crease in concentration from 1.8 mol/kg to 5.0 mol/kg before decreasing as the concentration was further increased to 5.6 mol/kg. Signatures of contact ion pair and of complex ion aggregates were shown to increase as the concentration was enhanced. Based upon the Eigen mechanism, we show that three association equilibria can be used to describe the transfor- mations between free solvated perchlorate anion, solvent-shared ion pair, contact ion pair and complex ion aggregates. The overall association constant, K, and the stepwise association constants Ki （i = 1 to 3） in the Eigen mechanism were determined separately with values of 0.025 ± 0.003, 0.023 ± 0.002, 0.068 ± 0.033 and 0.686 ± 0.174. Based on these constants, the electronic performance can be reasonably predicted by the optimum choice of electrolyte concentrations.

关键词： lithium perchlorate association constant ion pair Raman spectra

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Preliminary Assessment of Evaporating Supersaturated MgSO4 Droplet at Low Relative Humidity with Cavity Enhanced Raman Spectroscopy

Preliminary Assessment of Evaporating Supersaturated MgSO4 D...

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第十六届全国光散射学术会议

作者： seehua tan Institute of Chemical Physics Beijing Institute of Technology

＜正＞The effects of atmospheric aerosol particles on atmosphere,climate and human health have been posed as the central topics in current environmental *** one of the important constituents, MgSO4 has been widely studied on its variation of physicochemical properties in response to the changes in the relative humidity（RH） of the surrounding *** to Chan et al., MgSO4 droplet which held by electrodynamic balance（EDB） exhibit significant reduction of evaporation rate after certain duration,suggesting that MgSO4 droplet experiences mass transfer

关键词： Optical tweezers Cavity enhanced Raman spectroscopy MgSO4 droplet

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