> 1 min

How to check the transformer oil quality based on ASTM D971 and IEC 62961 standards?

Regular inspection of the transformer oil quality is important to ensure the operation of the transformer. Several methods are available, but the newly released IEC 62691 standard is based on the interfacial tension measurement between water and the transformer oil.

> 2 min

Why is wettability important in enhanced oil recovery?

In enhanced oil recovery wettability plays an important role as that determines the interactions between the solid (rock) and the liquids in the reservoirs (crude oil, brine). Wettability has been recognized as one of the key parameters controlling the remaining oil-in-place.

~ 3 min

What is wettability?

Wettability is the preference of a liquid to be in contact with a solid surrounded by another fluid (liquid or gas). Depending on the application, wettability can be wanted or not.

~ 3 min

What is graphene oxide?

Graphene oxide (GO) is the oxidized form of graphene. Graphene oxide is easy to process since it is dispersible in water and other solvents. Due to the oxygen in its lattice graphene oxide is not conductive, but it can be reduced to graphene by chemical methods.

> 2 min

What is surface free energy?

Surface free energy can be considered as the surface tension of a solid. Surface free energy is calculated through the contact angle measurements. By knowing the surface free energy of the solid, one can predict the behavior of any liquid on the surface.

< 3 min

What does self-cleaning mean?

A self-cleaning surface is any surface with the ability to readily remove any dirt or bacteria on it. Self-cleaning surfaces can be divided into three different categories; superhydrophilic, photocatalytic and superhydrophobic.

> 2 min

Why is contact angle important?

In industry, wettability is important for example when manufacturing electronics or when planning how to extract oil from the oil reservoir. In all these applications, knowing the contact angle value gives a strong indication on the performance of the product or a successfulness of the process.

~ 3 min

What are the differences between ASTM D971 and IEC 62961 standards?

The new standard IEC 62961 for the transformer oil quality testing has just been released. In this blog post, the main differences between the old ASTM D971 and the new IEC 62961 standard are discussed.

> 3 min

How to measure contact angle hysteresis?

The measurement methods can be divided into optical (needle and tilting methods) and force (Wilhelmy method) depending on the measurement principle used. All the methods are measuring advancing and receding contact angles which are used to calculate contact angle hysteresis.

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