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Name: Wilhelm M.
Status: Student
Age: 20s
Location: N/A
Country: N/A
Date: N/A


Question:
What simple method would make water be more attracted to a solid aluminum sphere. Example, if you have a soccer ball shape made out of solid aluminum and you wanted water to to run down the side without trickling off before it reached the absolute bottom.

What can be altered to make the water more attracted and stick to the aluminum -temperature, charge, type of water etc???



Replies:
Since detergents alter the surface tension of water, you might try adding some small amounts of dish or laundry detergent. Note if you add too much you might end up with suds. By adding some small amount you should fine the water performing what you are seeking to do.

Be careful to record the amount added and the net result. You should be able to pinpoint the best reaction for a given amout of detergent without unwanted side-effects.

Thanks for using NEWTON!

Ric Rupnik


This is a variation of a common problem faced in the paper coating industry, would you believe! You must control 3 variables:

1. You need a surfactant to "wet" the aluminum, and make the water "spread out". For this use a commercial "rinse aid" used in dishwashers to prevent "water spotting".

2. You need to increase the viscosity of the water with some sort of thickener. A thickener like polyvinyl alcohol, polyethylene oxide, or sodium alginate, is preferred. All are available commercially in many grades and types, if you have access to a chemical supplier. Otherwise you might try gelatin, but that's not nearly as good.

3. You need to make the solution "stringy" or "leggy" which is the word used in the trade. This is what paint does when you lift the brush up. The paint forms a long "string" that does not break. All of the above thickeners are of that type.

Vince Calder



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