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Trial Number 3

Client Number 241

Project Number 1

Trial Purpose:

To compare the effectiveness of the provided aqueous solution for hydrophobic interactions for smooth substrate surfaces between a 0.1% concentrated coating and a full concentrated coating solution.

Date Run:

10/13/2015

Experiment Procedure:

Three multiple tests trials were conducted in total for two sets of solution concentration. One was at 0.1% dilution concentration of BDT Sample 1 (pH 8.0), BDT Sample 2 (pH 9.7) and Solution of BDT (pH 11.0). The diluted solutions at 0.1% were made by diluting 99.9 mL of deionized water with 0.1mL from the full concentration of the samples. Thereafter three additional test trials were conducted at full concentration on smooth substrate surface. In total of 6 tests were conducted. An initial test with a full concentration of BDT Sample 1 (pH 8.0) was tested on a set of three rough ceramic, aluminum and glass substrate. An initial contact angle of the substrates was obtained using the Video Fta32 Video 2.1 program with a Logitech quick cam pro4000. Apparatus of the machine was set at a constant position for consistency. Contact angles were measured by using a droplet of deionized water onto the surface after ~5 -10 seconds of waiting for stabilization of the water droplet. In the program three sets of points were used to obtain the angle. A baseline reading constituted two points and a third point was measured at the top of the bubble. Application of the solution was done in a gentle manner by using a TX 707A Large Rectangular Head Swab onto the surface of the three ceramic substrates one at a time. After the application of the solution onto one of the ceramic surfaces, a bounty paper towel rinsed with deionized water was gently wiped onto the surface in a circular motion. Thereafter another contact angle was obtained.

The set of ceramic substrates were allowed time for air drying for 5 minutes. Then a new contact angle reading was obtained on a different spot of the surface that has not been used for the prior contact angle readings. A new contact angle was obtained after every 5 minutes of air drying in room temperature. The set of ceramics was allowed to air dry for a total of 30 minutes (a total of 6 readings was done after the initial and after the application of the solution)

Trial Results:

Chemistries Evaluated: 0.1% concentration of BDT Sample 1 (pH 8.0); BDT Sample 2 (pH 9.7); Solution of BDT (pH 11.0). Full concentrations of BDT Sample 1 (pH 8.0); BDT Sample 2 (pH 9.7); Solution of BDT (pH 11.0)

Surfaces Evaluated: Smooth Ceramic, Aluminum and Glass substrates.

Success Rating:

Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.

Conclusion:

In comparison between two solution concentrations on smooth substrate surfaces; at 0.1% dilution, BDT Sample 1 was not as effective on ceramic substrates. However, it was effective on other smooth surfaces such as aluminum and glass. Whereas at a full concentration; all three solutions were effective at lowering the contact angles of all smooth surfaced substrates over a period of 30 minutes in room temperature. In conclusion smooth surfaces coated with a full concentration of the solutions works better than a coating with 0.1% dilution.

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