Surface Science Blog

Susanna Laurén

Susanna is an Application Scientist at Biolin Scientific. She In her PhD thesis, she developed fabrication methods for a new type of inorganic-organic polymers. Microfabricated polymer chips were utilized as tool for biomolecule separation in analytical chemistry.
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Recent Posts

What is Interfacial Rheology?

Posted by Susanna Laurén on May 3, 2017

  

When surface active molecules are present in the solution, they tend to adsorb in the gas-liquid or liquid-liquid interface. Surface active agents have hydrophobic and hydrophilic part, when at the interface, they orient so that hydrophilic part is in water-based solution and hydrophobic part in air or oil phase.

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Topics: rheology

How To Measure Surface Free Energy?

Posted by Susanna Laurén on April 6, 2017

If you have been looking for an instrument for contact angle measurement, you have probably noticed that measuring contact angle is not always enough. Although contact angle measurement does give you an indication on the wetting properties of the surface, it is always a value that depends on the measurement liquid used.

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Topics: Surface Free Energy, Contact Angle

Why disposable tip dispensers are superior to disposable syringes

Posted by Susanna Laurén on March 13, 2017

If you are working with inks, paints or other contaminating liquids and thinking of measuring contact angles, we have good news for you. By having a disposable tip dispenser, you can get away with messy sample handling and perform your measurements even faster. 

 

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Topics: Attension

How to measure dynamic contact angles on superhydrophobic surfaces

Posted by Susanna Laurén on January 17, 2017

Superhydrophobic surfaces are gaining more and more attention as new applications for them arises. For surface to be superhydrophobic, it has to fulfil two requirements. The static contact angle has to be over 150 degrees but in addition to that, the surface has to have a low contact angle hysteresis. For this reason, measurement of dynamic contact angles is especially important when superhydrophobic surfaces are studied.

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Topics: Contact Angle, superhydrophobic surfaces

Vanishing interfacial tension measurement - a fast route to minimum miscibility pressure

Posted by Susanna Laurén on December 6, 2016

As the exploration of new oil reservoirs is slowing down, there is a need to be able to utilize the current oil reservoirs more efficiently. After primary and secondary recovery, at least 50% of the original oil is left behind in the reservoir [1]. Additional injections of fluids like polymers, surfactants or different gases are commonly used to displace and dissolve some of the remaining oil. This process is called tertiary or enhanced oil recovery (EOR) and can lead to an additional 8-16 % uptake of original oil in place (OOIP) [1].

 

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Topics: Tensiometers, Attension, Theta, Enhanced oil recovery (EOR), High Pressure Chamber

Durability of superhydrophobic surfaces – the biggest obstacle towards real life applications

Posted by Susanna Laurén on November 8, 2016

Superhydrophobic surfaces were an instant hit in the scientific community when they were introduced over two decades ago. Since then thousands of publications have documented superhydrophobicity being achieved on various different substrates, from glass to fabrics.


The great potential of superhydrophobic surfaces was apparent early on. Applications ranging from self-cleaning windows to anti-acing surfaces and non-wetting fabrics appear commonly in the literature.

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Topics: superhydrophobic surfaces