Application principle and precautions of platinum ring Surface Tensiometer

Surface tension is a manifestation of the mutual attraction between molecules on the surface of a liquid and is an important parameter in the properties of a liquid. Platinum ring Surface Tensiometer, also known as du Nouy ring method, hanging ring Surface Tensiometer and de-ring Surface Tensiometer, is a commonly used method to measure surface tension. This article will introduce the principle, application precautions and purchase points of the platinum ring Surface Tensiometer.

Principles and measurement methods

The measurement method of the platinum ring method is based on a series of steps: First, the platinum ring is gently immersed in the liquid to be measured. Then, the platinum ring is slowly lifted upward, causing the liquid level to drop, forming a liquid column, and finally the platinum ring is separated from the liquid. At this time, the highest value of separation between the platinum ring and the liquid is recorded, which is a state where the platinum ring is in contact with the liquid but is not completely separated. This maximum value is the measurement of surface tension. Tips: The accuracy of the maximum value will be affected by the viscosity of the liquid, so the viscosity of the liquid has a certain impact on the accuracy of the measurement results.

Application Notes

Although the platinum ring tensiometer is an effective measurement method in many situations, it can be problematic in certain situations. Especially when applied to the measurement of samples with viscosity or surfactants, the following problems arise:

Impact on viscosity calculation: When measuring samples with viscosity, the viscosity will have an impact on the measurement results. This is because the platinum ring method fails to take viscosity into account and therefore cannot accurately measure surface tension.

Single time point measurement: The platinum ring method can only measure the surface tension value at a single time point and cannot measure the surface tension value that changes over time. This may not be applicable for applications where liquid properties change over time.

Key points for purchasing: When purchasing a platinum ring Surface Tensiometer, there are several key points to pay attention to:

Surface tension principle: Understand the surface tension measurement principle used by the instrument to ensure that it is suitable for the required application scenario.

Scope of application: Confirm whether the instrument is suitable for measuring viscosity samples or surfactants, and select the appropriate instrument according to actual needs.

Time-varying testing: If necessary, select instruments that enable time-varying measurements to meet specific experimental requirements.

Platinum ring design: Pay attention to the design issues of the platinum ring, especially whether its thickness design meets the requirements. Make sure your white gold ring is of good quality to get accurate measurements.

Summarize

The platinum ring Surface Tensiometer is a commonly used surface tension measurement method. Its principle is simple and it performs well in many application scenarios. However, there are limitations to be aware of when measuring samples or surfactants with viscosity. When purchasing an instrument, choose the appropriate instrument based on actual needs and pay attention to the design issues of the platinum ring to ensure accurate and reliable measurement results.