Effects of alcohol solvents on formation of the hydrated silica gel
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
Usually, when silica sol is prepared by adding inorganic acid to a diluted sodium silicate solution, a basic substance is addedto adjust the pH of the silica sol in order to occur the gelation reaction of the silica sol. However, in this study, it was confirmedthat the gelation of the silica sol could occur even when an alcohol is added instead of the basic substance. In order to examinethe mechanism of gelation that occurred when alcohol was added to the silica sol, different solvents (protic and aprotic) wereadded to the silica sol and the gelation time was measured. The results revealed that the gelation occurred due to the tendencyof the hydroxyl oxygen in the alcohol to bond to the hydroxyl hydrogen of the water molecules that had already formed ahydration shell around the silica particles. Therefore, it is presumed that the hydration shell was broken by the addition ofthe alcohol. This, in turn, led to the instantaneous polycondensation between the silica particles, which caused the gelation.
Abstract
Usually, when silica sol is prepared by adding inorganic acid to a diluted sodium silicate solution, a basic substance is addedto adjust the pH of the silica sol in order to occur the gelation reaction of the silica sol. However, in this study, it was confirmedthat the gelation of the silica sol could occur even when an alcohol is added instead of the basic substance. In order to examinethe mechanism of gelation that occurred when alcohol was added to the silica sol, different solvents (protic and aprotic) wereadded to the silica sol and the gelation time was measured. The results revealed that the gelation occurred due to the tendencyof the hydroxyl oxygen in the alcohol to bond to the hydroxyl hydrogen of the water molecules that had already formed ahydration shell around the silica particles. Therefore, it is presumed that the hydration shell was broken by the addition ofthe alcohol. This, in turn, led to the instantaneous polycondensation between the silica particles, which caused the gelation.
참고문헌 (25)
- R.T. Yang, "Gas Separation by Adsorption Process" (1997), Butterworth;Imperial College Press
- M.A. Aegerter, "in Aerogels handbook", pp.114~ (2011), Springer
- U.K. Bangi, , Sci. Technol. Adv. Mat., 9(3), pp.035006~ (2008)[DOI]
- Y. Pan, , J. Sol-Gel Sci. Technol., 82(2), pp.594~601 (2017)[DOI]
- P.B. Sarawade, , Solid State Sci., 12(5), pp.911~918 (2010)[DOI]
- A.S. Dorcheh, , J. Mater. Process. Technol., 199(1), pp.10~26 (2008)[DOI]
- C.J. Brinker, "in Sol-gel science: the physics and chemistry of sol-gel processing", pp.1~ (2013), Academic Press
- S. Wilhelm, , Polymers, 7(12), pp.2504~2521 (2015)[DOI]
- K. Sinko, , Materials, 3(1), pp.704~740 (2010)[DOI]
- C.J. Brinker, "in Sol-gel science: the physics and chemistry of sol-gel processing", pp.97~ (2013), Academic Press
- C.J. Brinker, , J. Non-Cryst. Solids, 63, pp.45~59 (1984)[DOI]
- M.J. Kamlet, , J. Org. Chem., 48, pp.2877~2887 (1983)[DOI]
- D.V. Matyushov, , J. Phys. Chem. B, 101, pp.1035~1050 (1997)[DOI]
- J. Rydberg, "in Solvent extraction principles and practice, revised and expanded", pp.41~ (2004), CRC Press
- P.W. Fenimore, , Proc. Natl. Acad. Sci. U.S.A., 101(40), pp.14408~14413 (2004)[DOI]
- J. Israelachvili, , Nature, 379(6562), pp.219~ (1996)[DOI]
- S. Song, , J. Colloid Interface Sci., 287(1), pp.114~120 (2005)[DOI]
- B. Grunberg, , Chem. Eur. J., 10(22), pp.5689~5696 (2004)[DOI]
- S.Y. Park, , Chem. Eur. J., 22(13), pp.4340~4344 (2016)[DOI]
- J.J.E. Moreau, , Chem. Eur. J., 11(5), pp.1527~1537 (2005)[DOI]
- I. Artaki, , J. Non-Cryst. Solids, 81(3), pp.381~395 (1986)[DOI]
- H. Zhu, , Int. J. Pharm., 135(1-2), pp.151~160 (1996)[DOI]
- J.H. Jung, , Angew. Chem., Int. Ed., 39(10), pp.1862~1865 (2000)[DOI]
- C. Reichardt, "in Solvents and solvent effects in organic chemistry", pp.81~84 (2011), John Wiley and Sons
- R. Breslow, , Acc. Chem. Res., 24(6), pp.159~164 (1991)[DOI]