Recommended measurement method for reading the adsorption/desorption behavior of surfactants and changes in surface properties by adsorption is Quartz-Crystal Microbalance (QCM-D). By capturing continual changes in frequency obtained when the sensor resonates, you can clearly see the unfolding phenomena.

How does fabric softener work in the process of washing?

How much does it adsorb to cloth and wash away during the rinsing process?

You can imagine how surfactant in the fabric softener works by measuring the surface charge with electrokinetic analyzer for solid surface analysis, using cloth as the measurement substrate.

Not limited to softener, there are many situations where it can be applied, such as a cleaning agent that efficiently removes specific materials and a treatment that firmly adheres to hair and gives a smooth texture.

Recommended for checking not only the behavior of the surfactant itself but also if there are any changes in adsorption/desorption behavior depending on other ingredients.