~ 4 min

Characterization of polyelectrolyte multilayer build-up and structure

The versatility of polyelectrolyte multilayers, PEMs, is high, which makes them interesting for e.g. biomedical applications. The functionality is largely determined by the layer properties, which needs to be understood to be tailored. Here, we show how PEMs can be characterized with QCM-D.

> 2 min

What is contact angle hysteresis?

Contact angle hysteresis (CAH) is an important physical phenomenon. When you look through the window on a rainy day, you have probably noticed that some of the water droplets stick to the glass even though gravity is pulling them down. The phenomenon can be explained by contact angle hysteresis.

7 min

Why temperature stability is critical in QCM-measurements

Temperature stability is key to achieve reliable and reproducible QCM measurements. But why is a stable temperature so important? And how will temperature variations affect your measurements? Here we explain the causes and effects of temperature related artifacts in QCM measurements.

< 3 min

How to characterize surfactant solutions?

Surfactants are used in many industrial fields. Characterization of surfactants is thus important to optimize their performance and the products they are applied to. Surface and interfacial tension measurements offer versatile method to study the properties and behavior of the surfactant solution.

~ 6 min

What to consider when analyzing combined QCM-D and ellipsometry data

QCM-D and ellipsometry are two surface sensitive real-time technologies that can be used in combination to give synergistic effects. To make to most of the combined output data, there are some aspects to consider when setting up the combined experiment and when analyzing the captured data.

< 3 min

Why measure dynamic contact angles?

Contact angles are routinely measured as they offer simple, yet extremely sensitive measurement method for surface characterization. Although, the static contact angle is an excellent tool, more in-depth understanding of the surface properties require dynamic contact angle measurements.

> 5 min

What is the difference between QCM mass and Ellipsometry mass?

The mass extracted by QCM-D and ellipsometry are often not the same. So, what is the difference between these masses, and why are they not equal?

~ 4 min

How to make better blood-repellent surfaces?

Blood-repellent surfaces are needed in medical devices that come in contact with blood. The traditional approach has been the use of antithrombotic surface treatments However, these coatings are prone to eventually wear-off. Superhydrophobic surfaces have been proposed as an alternative solution.

> 4 min

What is the Sauerbrey equation?

In the context of QCM technology, there is often a reference to the so-called Sauerbrey equation. Here we explain what this equation is, and when it should be used.

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