Measure the surface tension (SFT) of liquids and solid melts or use SFT to check the purity of your test liquids for contact angle measurement. With the novel, accurate Constrained Sessile Drop method, a single sessile drop is sufficient for this purpose without time-consuming changeover to a pendant drop needle.
For the measurement, a drop as large as possible is dispensed onto a circular sample pedestal of the SH3201 sample holder and its curvature is evaluated. For serial analyses, up to four pedestals can be placed side by side in the prepared wells of the holder in a simple way.
The Constrained Sessile Drop is particularly suitable for otherwise difficult measurements of the SFT of molten solids such as hot melts. For one thing, it requires much smaller sample volumes than other methods. For another, melting directly on the pedestals avoids contact of the samples with other surfaces and the associated time-consuming cleaning. Measurements at up to 400 °C are possible with accessories such as the TC21 temperature control chamber.
The SH3201 comes with ten sample pedestals (can be reordered as SH3200) and tweezers for easy and contamination-free placement.