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    Surface Science Blog You have only scratched the surface.

    Gabriel Ohlsson

    Gabriel Ohlsson

    Gabriel Ohlsson, Ph.D., is a former employee at Biolin Scientific where he initially held a position as an application scientist and later as a sales manager. Dr. Ohlsson did his Ph.D. in engineering physics and has spent a lot of time developing sensing technologies for soft matter material applications. One of his main tools during this research has been the QCM-D technology.

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    ~ 6 min

    What is a Viscoelastic material?

    Viscoelasticity is a quality involving both viscous and elastic properties at the same time.

    ~ 3 min

    Why is the resonance frequency of a QCM sensor 5MHz?

    The fundamental resonance frequency of QCM-sensors is often 5MHz. Learn about the theory behind the number.

    ~ 11 min

    Why it is useful to use multiple overtones in QCM measurements

    Read about why it is possible to gain valuable information from a viscoelastic sample by monitoring multiple overtones in QCM measurements.

    ~ 7 min

    What does the dissipation factor in QCM-D tell us?

    The D-factor provides information that is complementary to the frequency response. Read about how it can be understood and what information it reveals.

    ~ 3 min

    Time-resolved analysis of surfactant-surface interaction

    Surfactants are key components in many products and processes where the surfactant-surface interaction dynamic could be critical. Here we show how the surfactant interaction with surfaces can be analyzed in a time-resolved manner at the nanoscale.

    ~ 3 min

    Polymer brush swelling and collapse - characterization with QCM-D

    Polymer brushes, polyelectrolyte multilayers and hydrogels are typically used to achieve desirable properties. Key parameters influencing these properties are layer conformation and the degree of hydration. Here we show a straightforward way to measure polymer brush swelling and collapse.

    ~ 4 min

    How to measure crosslinking and collapse with QCM-D

    Polymers and polyelectrolytes of various conformations are used in many applications where there is a need to tailor the interfacial properties to promote a certain interaction with the surrounding environment. Here we show how polymer layer crosslinking and collapse can be characterized.

    ~ 5 min

    QCM-D mass and thickness - How to measure

    Read about how molecule-surface interaction processes and binding can be characterized by QCM-D via time-resolved measurements of mass and thickness.

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