Product Overview

The Attension Sigma 700/701 force tensiometer measures the static surface tension and interfacial tension of liquids. A platinum Du Noüy ring, platinum Wilhelmy Plate or platinum rod is suspended from a microbalance. A vessel containing the liquid sample is raised until the ring or plate touches the surface of the liquid. The liquid is drawn up in a meniscus on the solid surface and creates a force due to surface tension. The force is measured by the microbalance and from this the surface and interfacial tensions are calculated.

The information provided includes properties such as dynamic contact angle, surface free energy and wettability. A common application is Critical Micelle Concentration (CMC) which is the concentration of surfactants in which micelles are spontaneously formed.

The Sigma 700/701 force tensiometers are computer controlled. The OneAttension software provides a high level of automation with live analysis and multiple measurement options. It includes automated measurement of CMC.

Sigma 700 is the most versatile tensiometer with an auto-calibrating microbalance that measures up to 210g. The wide measurement range makes it suitable for heavy solids and powder samples.

Sigma 701 has a more sensitive microbalance with a narrower weight range and a maximum load of 5g. The high sensitivity it ideal for dynamic contact angle measurements of fibers.