Abstract
Interface tension and temperature coefficient of its gradient between silicone oil (KF96L-2cSt, 5cSt, KF96-10cSt, 20cSt) and fluorinert (FC-40,3283) were measured. They are very important property when the flow affected by marangoni effect is investigated in a laboratory. Marangoni force due to the gradient of surface tension often affects a flow in a crystal growth process on the ground. In order to damp marangoni convection, applying a liquid encapsulation system has proposed. However, even with the encapsulant, marangoni convection may be still a big problem on the micro gravity condition. The interface tension was measured by using a commercial interfacial tensiometer based on the pendant drop method at first. However, its measurement accuracy was not so high for our targets, that is, relatively small interface tension and its temperature dependency. Therefore, the interface tension was also measured with an image processing technique. The standard deviation of each measured value was less than 0.03mN/m.
