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Surface Science Newsletter – Issue 48
Reliable characterization of pressure-sensitive adhesives

Reliable characterization of pressure-sensitive adhesives

Acrylate-based pressure-sensitive adhesives (PSA), such as those used for adhesive strips, can be optimized for use on various materials by different proportions of polar and non-polar chemical groups. Additionally, PSAs adapt themselves to a certain extent to their particular environment by flexible redistribution. However, neither this effect, known as Hydrophobic Recovery, nor the influence of polar and non-polar fractions on the wetting and adhesion are easy to characterize. In conjunction with tesa SE, a manufacturer of adhesive materials, we have developed a method for reliable wetting measurements based on the Wilhelmy contact angle, which helps in the analysis and specific optimization of pressure-sensitive adhesives.

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Product
Contactless and precise roughness measurement in the lab or directly in the production process

Contactless and precise roughness measurement in the lab or directly in the production process

Whether a surface must be very smooth or show a certain texture or degree of roughness: Our new Surface Roughness Analyzer – SRA precisely pictures the topographic condition of a surface and provides information for optimizing the material or production process. Contactless, quickly, and with an extremely high resolution, the SRA delivers a 3D image of a sample‘s surface and the correlating data which exactly describe its topography. Analyses with the SRA also help to evaluate the contribution of roughness to the wettability of a sample or to the adhesion of coatings.

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Application
From an oil-water system to a microemulsion: Interfacial tension over six decades with one and the same instrument
From an oil-water system to a microemulsion: Interfacial tension over six decades with one and the same instrument

In industrial applications such as enhanced oil recovery (EOR), pharmaceutics, or cosmetics, it is often necessary to mobilize and transport hydrophobic substances in aqueous media. The ideal way to do this is to form a microemulsion, i.e. a thermodynamically stable dispersion. When trying to synthesize such mixtures, the interfacial tension (IFT) between water and the hydrophobic phase can range from 50 mN/m for the raw substances to values as low as 10-5 mN/m for the fractions of a successfully created microemulsion. When searching for just the right composition, it is helpful to use a measuring instrument that covers this very broad IFT spectrum.

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Videos
Fully automatic foam height measurements using Ross-Miles

Fully automatic foam height measurements using Ross-Miles

Our Ross Miles Foam Analyzer – RMFA is the first measuring instrument for automatic analysis in accordance with Norm ASTM D 1173 with electronic foam height detection. Watch the video to see how convenient it is to take measurements with the RMFA, and how the results are much more reproducible in comparison with conventional manual measurement.

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Our MSA in a Siemens Gamesa image video

Our MSA in a Siemens Gamesa image video

Surface analysis for sustainable energy supply: Follow engineers Ane Sælland Christiansen and Bianka Hoffman from Siemens Gamesa on their journey through the plant and see our Mobile Surface Analyzer – MSA in action while taking measurements on giant wind turbines.

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Beyond the surface
Microfluidics with Tipp-Ex

Microfluidics with Tipp-Ex

The term microfluidics covers various techniques for specifically manipulating tiny quantities of liquid. Among others, biomedicine uses paper-based devices to distribute drops of blood, for example, on different parts of a surface provided with color indicators. Here, wetting barriers consisting of hydrophobic lines or patterns, which are applied by techniques such as ink-jet printing, are used as channels. But not every laboratory has the resources for producing such paper-based miniature labs. A group of Indian scientists has found a simple way of making test papers without technical aids, namely by hand, using a titanium-dioxide-based correction pen. The dispersion fills the paper pores with hydrophobic particles and forms a flow barrier. Tests with different bioanalysis-related liquids and measurement of the contact angles on the correction pen layer substantiate the practicality of the method.

Foaming the pharmaceutical product, improving the effect

Foaming the pharmaceutical product, improving the effect

The particular flow properties of foams repeatedly open up interesting fields of application – such as in medicine. Here, for the treatment of varicose veins, the blood vessels are specifically hardened (sclerotized) by injecting certain preparations and thus separate from the blood circulation and thereby are obliterated. The injection of foam instead of a homogenous solution extensively isolates the local treatment area from the surrounding tissue with the advantage of lower doses and reduced side-effects. Practically, one of the most important sclerotizing substances, polidocanol, is a surfactant with vigorous foam formation. This solution can therefore be easily and manually foamed before injecting (see photo) without any additional substances.

Events
Focus seminar with Dr. Kash Mittal

Secure yourself a place for our seminar on adhesion with Dr. Kash Mittal

In spring 2019 our focus seminar Course on Adhesion Science and Technology with adhesion expert Dr. Kash Mittal will take place again.

We are very glad to invite you to our Applications & Science Center in Hamburg from March 25-26, 2019.
Seminar registration
New: Certificate course for MSA and Liquid Needle users
New: Certificate course for MSA and Liquid Needle users
You, as a user of our instruments with your practical applications, are the center of attention in our certificate course. Register now and become a professional tester of wetting and surface free energy.

We would like to invite you to our Applications & Science Center in Hamburg on May 21, 2019.
Course registration
Meet us at international conferences and exhibitions

Meet us at international conferences and exhibitions

We look forward to demonstrating our innovative technology in the field of interfacial analysis and meeting you at the following events:

  • ArabLab | Mar 12-14 |
    Dubai, UAE | Booth 527
  • European Coatings Show | Mar 19-21 |   Nuremberg, Germany | Hall 5, booth 327
  • Forum Lab | Mar 26-28 | 
    Paris, France | Booth C30
  • InPrint | Apr 9-11 |
    Louisville, KY, USA | Booth 428

Check out our events page to find out about all the fairs and conferences we will be attending in the coming months.

Don't miss any of our talks

Don't miss any of our talks

Take the chance and visit our talks at the next international events and exhibitions:

  • SPE ANTEC | Detroit, MI, USA | Mar 18, 4:00 pm | A. Kasson: "Why Test Inks and Dyne Pens Cannot Tell The Full Truth About Surface Free Energy"
  • European Coatings Show | Nuremberg, Germany | Mar 20, 3:30 pm | hall 9, booth 544 D. Frese: "Das Konzept hinter der Liquid Needle und die Einsatzmöglichkeiten für die Qualitätssicherung"