Tag Archives: contact angle measurement

  • Medical Device Applications

    by Emily Walsh February 2017

    BTG Labs’ origins are in the research and development of adhesives and coatings, including the development of a corrosion resistant antimicrobial coating–often used in the medical device industry. The Surface Analyst is the ideal surface cleanliness gauge for the medical device industry in that it is completely non-destructive, precise, quantitative, and able to measure on various substrates including rough, convex, and concave surfaces. BTG Labs’ twenty plus years of expertise can assist in the optimization of medical device manufacturing processes to meet the highly-tailored specs of this industry to manufacture more reliable, fail resistant products.

    Monitor

    • Layers of silicone wafers prior to bonding
    • Sanding and solvent wiping on carbon fiber and titanium for prosthetics
    • And identify the presence of detrimental silicone in a bonding step
    • Flame treatment on medical devices including catheters
    • Plasma treatment on catheters prior to bonding luers
    • Surfaces preparations prior to solvent bonding

    Validate

    • Microbial lubricious coating and uniformity on catheters
    • Surface cleanliness of stainless, aluminum, titanium, and polymer devices
    • Sterilization methods such as ultra-sonic baths and vacuum plasma chambers
    • Audit concerns with shelf-life and uniformity of antimicrobial coatings …Read More
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  • Surface Analyst vs. Benchtop Goniometer

    by Emily Walsh October 2016

    The Study of Goniometry

     

    Contact angle goniometry is the study of the characterization of liquid/solid interactions. The first benchtop goniometer designed at the NRL (U.S. Naval Research Laboratory) served as a monumental advance with a way to measure contact angles to measure surface energy. Today, more and more companies are realizing the need for surface monitoring as the use of bonding is replacing mechanical fastening within manufacturing. In order to reliably bond, a clean surface is necessary. Thus, measurement of surface energy is important when bonding, coating, sealing, printing, painting, or cleaning. But, the standard benchtop goniometer has its limitations, rendering it less than ideal in a manufacturing setting where surface preparation is key to bonding.

     

    Limitations of the Benchtop Goniometer

     

    While the benchtop goniometer is an acceptable instrument for use the lab, its size and measurement technique create limitations for use in other settings. Moreover, the process in which the goniometer measures surface energy only applies to smooth, flat surfaces. This obviously has its set backs on the production floor as manufactured parts can have rough or curved surfaces. To measure surface energy, the benchtop goniometer uses a syringe to build a bead of liquid which is touched to the surface for deposition. The user then measures the contact angle from a horizontal profile by visual examination. This technique requires significant training and leaves plenty of room for human error. Thus, the benchtop goniometer primarily applies in a laboratory setting with minimal environmental variables and thoroughly trained users. …Read More

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  • Handheld Solution for Verifying Surface Cleanliness

     

    low contact angle

    Figure 1. Water drop demonstrating a low contact angle and a clean surface.

    high contact angle

    Figure 2. Water drop demonstrating a high contact angle and a contaminated surface.

    The Surface Analyst™ is an innovative handheld solution for use in the lab and on the factory floor. It reduces waste, rework, and recalls when poorly prepared substrate surfaces lead to bonding, coating, sealing, painting, or printing failure.

    Using contact angle measurement, the Surface Analyst measures the cleanliness level of surfaces and determines preparedness for adhesion. Developed and manufactured by BTG Labs, it is a fast, easy, accurate, and nondestructive instrument for manufacturers with critical surface requirements. The Surface Analyst replaces legacy methods such as dyne and water break tests.

     

    Measuring Contact Angle to Determine Surface Cleanliness

     

    The Surface Analyst deposits a highly purified drop of water on the surface. In two seconds, it measures the contact angle and in turn, determines the cleanliness level of a substrate.

    When a surface is clean, it emits high energy, and water–as a high energy molecule–spreads out on the surface, in attraction to other high energy molecules (Figure 1). A contaminated surface emits low energy and will cause water to bead up in attraction to itself rather than the low energy surface molecules (Figure 2).

    By knowing the volume and area of a drop of water, the contact angle of the water against a given surface can be determined. The larger the contact angle, the more the water beads up on the surface – and therefore the lower the energy level of the surface.

    …Read More

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