Several free-surface profiles of extended menisci of evaporating one
centistoke silicon oil were experimentally measured and plotted, as shown in Fig.
Polydimethylsiloxane (PDMS) is the most common silicone, which has been used in many kind of preparations such as liquid, gel and solid.1,2 Polymerization and the length of siloxane chain may affect its viscosity, which is measured in units of
centistokes (cS).
As sulfur hexafluoride (SF6) or perfluoropropane (C3F8) was not commercially available in Mainland China since June, 2015, we used silicone oil (5000
centistokes, Zeiss) for intraocular tamponade in all cases.
SO with viscosities of 1000 and 5000
centistokes (CS) are being used by surgeons according to their preferences and required duration of endotemponade, despite evidence that there is no difference in temponading force of them2,3.
The kinematic viscosity of B20 is 5.30
centistokes at 37.8[degrees]C and 5.22 at 40[degrees]C.
The silicone oil viscosity of 1000 and 5000
centistokes (cs) was found in 70 (88.6%) and 9 (11.4%) cases respectively (Table-I).
Table 1: Properties Diesel SFME 20% SFME 40% SFME Density, Kg/[m.sup.3] 860 900 868 876 Calorific value, kJ/kg 42800 37800 41800 40800 Viscosity,
centistokes 3.01 5.8 3.568 4.126 Flash point, [degrees]C 60 98 67.6 75.2 Diesel index 50 48 49.6 49.2
"It has a viscosity of over 1 million
centistokes, versus 600,000 typical for LSR, and it's not shear-thinning like normal LSR.