Keywords
hydrogel
index of thixotropy
modification
silica
structural recovery.
Abstract
The effects of modification of a silica matrix with organic groups, the order of mixing components in a sol-gel synthesis, and the magnitude of shear loading on the thixotropic properties of silica hydrogels were studied. All synthesized hydrogels were thixotropic and restored their structure by more than 90% within 1--3 min after shear load removal. The thixotropic properties of the organically modified hydrogels and the hydrogels prepared by adding a buffer solution (pH 7.4) to a silica sol were higher due to their stronger structures.
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