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How does the Surface Analyst determine surface quality?
Surface Quality means different things to different people. For those interested in surface characteristics that depend on surface chemical composition and uniformity (such as cleanliness, coating adhesion, and adhesive bond performance), the contact angle-based measurement performed by the Surface Analyst 5001 provides unequalled sensitivity to minute changes in these properties.
With our patented Ballistic Deposition technology, the Surface Analyst 5001 is sensitive to the contact angle hysteresis of a surface. This makes the Surface Analyst 5001 significantly more sensitive to most surface chemical properties than traditional goniometers.
What makes the Surface Analyst different than a side-view goniometer?
One of the most important features of the Surface Analyst 5001 is its innovative use of top-down imaging of the deposited drop, rather than the side view used by laboratory-type goniometers.
BTG Labs' top-down approach allows contact angle measurements to be obtained on surfaces of real-world objects that have features or orientations that prevent side viewing of a drop. Examples of these types of surfaces include: a populated circuit board, a tiny catheter, a machined metal casting, or a rough composite material surface where the hills and valleys prevent seeing the drop's edge with a side view.
When a drop of fluid is deposited on a real-world surface, it rarely produces a perfectly round droplet due to texture or chemical heterogeneity of the surface. This means there will be a range of contact angles around the drop perimeter. A side-view measurement only measures 2 of those angles and can give an erroneous picture of the true surface state.
The Surface Analyst 5001 with Dynamic Detection uses a patented top-down imaging approach to measure up to 200 points around the entire drop.
This innovative measurement provides a contact angle that more accurately represents the droplet's interaction with the surface and provides precise information about the true state of the surface.
Can the Surface Analyst measure on different types of surfaces?
The Surface Analyst 5001 has been used successfully on a wide variety of surfaces including: polymer films, metal castings, medical catheters, semiconductors, composite material, populated circuit boards, structural glass and much more. For applications where surface chemical properties are important, the Surface Analyst 5001 can provide rapid, quantitative feedback regarding the surface's quality, treatment level, cleanliness, and consistency.
Does surface roughness affect contact angle measurement accuracy?
Interrogation of rough surfaces is another situation where the Surface Analyst 5001 excels over all other contact-angle based measurements. Unlike side view goniometers where surface roughness obscures the view of the drop edge, the top-down contact angle measurement of the Surface Analyst 5001 images the entire drop perimeter regardless of roughness and returns the true average contact angle of the entire drop perimeter. The resulting number reflects the true surface state.
How accurate is the Surface Analyst at measuring contact angle?
The Surface Analyst 5001 is calibrated to match a NIST-traceable laboratory goniometer. It repeatedly proves to have higher precision (i.e. more repeatable) than sideview goniometers on real-world surfaces.
On chemically uniform surfaces, contact angle measurements using the Surface Analyst 5001 show standard deviations of less than one degree.