Abstract
A variety of ordered (macro)mesoporous silica ((M)MPS) was prepared, impregnated with calcium chloride (CC) and finally tested for water uptake. Liquid-grown MPS (LMPS) were in the short tube bundles, aerosol-made MPS (AMPS) were the spheres having the pores in parallel with their surface, and dip-coated MPS (DMPS) were in a form of 2-D hexagonal film. Ordered macropores were introduced to AMPS and DMPS by using polystyrene latexes as templates. Post impregnation of CC on these (M)MPS, obeying Langmuir isotherm, increased with the chemical activity and BET specific area of the host surface, in the order of AMPS < LMPS ~ AMMPS < DMPS < DMMPS. The salt, once loaded above ~ 0.06 g CC/g (M)MPS, continued to uptake water until they formed the salt solution in equilibrium with the prevailing water vapor at the given temperature. However, the CC, in situ impregnated in AMPS, was not all available for water uptake, due to some chemical deterioration. For the given host materials, the particle-to-particle voids, if any, and CC loading retarded the rate of water uptake. For the given salt loading, the internal uptake rate increased in the order of AMPS < LMPS ~ AMMPS < DMPS < DMMPS.
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology(No.2010-0025332) and the Chung-Ang University Research Grant in 2013.
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Ahn, K.W., Kim, SG. Preparation of various well-organized porous silica impregnated with calcium chloride and their water uptake. J Sol-Gel Sci Technol 71, 342–353 (2014). https://doi.org/10.1007/s10971-014-3375-8
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DOI: https://doi.org/10.1007/s10971-014-3375-8