To gel or not to gel: A prior prediction of gelation in solvent mixtures |
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Authors: | Peng Lin Nan-Xiang Zhang Jing-Jing Li Jing Zhang Jia-Hui Liu Bao Zhang Jian Song |
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Institution: | a School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
b The Co-Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, China;
c Renai College of Tianjin University, Tianjin 301636, China;
d Tianjin Engineering Research Center of Functional Fine Chemicals, Tianjin 300072, China |
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Abstract: | The gelation behaviours of low molecular weight gelators 1,3:2,5:4,6-tris(3,4-dichlorobenzylidene)-D-mannitol(G1)and 2,4-(3,4-dichlorobenzylidene)-N-(3-aminopropyl)-D-gluconamide(G2)in 34 solvents have been studied.We found that sample dissolved at low concentrations may become a gel or precipitate at higher concentrations.The Hansen solubility parameters(HSPs)and a Teas plot were employed to correlate the gelation behaviours with solvent properties,but with no success if the concentration of the tests was not maintained constant.Instead,on the basis of the gelation results obtained for the G1 and G2 in single solvents,we studied the gelation behaviours of G1 and G2 in 23 solvent mixtures and found that the tendency of a gelator to form a gel in mixed solvents is strongly correlated with its gelation behaviours in good solvents.If the gelation occurs in a good solvent at higher concentrations,it will take place as well in a mixed solvent(the good solvent plus a poor solvent)at a certain volume ratio.In contrast,if the gelator forms a precipitate in a good solvent at higher concentrations,no gelation is to be observed in the mixed solvents.A gelation rule for mixed solvents is thus proposed,which may facilitate decision making with regard to solvent selection for gel formation in the solvent mixtures in practical applications. |
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Keywords: | Gelation rule Prediction Solvent mixtures Concentration Good solvent Teas plot Aggregation mode |
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