  Water's viscosity dependence on pressure was also not affected by O-GNFs,
except at 10 ppm, where the shuttle effect may have increased the presence of
hydrophobic methane bubbles in the solution. Under high pressure, the relative
viscosity of the system remained non-Einsteinian at all temperatures except 2C.
This may have been because the density anomaly of water was shifted to a colder
temperature as the hydrogen bonding network was weaker. The phase transition
from liquid to hydrate was identical to that of pure water, indicating that the
presence of different stages of growth was not affected by the presence of
O-GNF. However, the times to reach a maximum viscosity were faster in O-GNF
systems compared to pure water. This said, the hydrate formation limitations
inherent to the measurement system were not overcome by the presence of O-GNFs.
The times to application-relevant viscosity values were maximized in the 1 ppm
system at 49.75 % (200 mPa.s) and 31.93 % (500 mPa.s) faster than the baseline.
Therefore, the presence of O-GNFs allowed for shorter times to desired
viscosities and at lower driving forces than the baseline, improving the
viability of the hydrate technologies to which they can be added.
