Study on Gelation, Properties and Micromorphology of Modified Nano-TiO2 Crosslinking Hydroxypropyl Guar Gum.

In the study, a hydroxypropyl guar gum (HPG) gel was prepared using modified nano-TiO2 particles as a crosslinking agent. Firstly, nano-TiO2 particles were prepared using the sol–gel method. Nano-TiO2 particles were spherical and densely distributed; the effective particle size was 29.0 nm, and particle size distribution was uniform. Then, the modified nano-TiO2 particles were synthesized by modifying nano-TiO2 with polyhydroxy carboxylate. The microstructure of nano-TiO2 and modified nano-TiO2 crosslinked HPG gel were investigated. The layered distribution and crosslinked network of the modified nano-TiO2 gel were denser than that of nano-TiO2 crosslinked HPG gel. The modified nano-TiO2 crosslinked HPG gel shows stable viscoelasticity at 60 ℃. Compared with nano-TiO2 crosslinked HPG gel, it has better temperature resistance and shear resistance, and can adapt to formation fracturing at 140 ℃, indicating that this gel may have potential application in fracturing. [ABSTRACT FROM AUTHOR]