|Ionizing Gasoline???? (archive)|
Posted by Fred Kern on October 04, 1998 at 22:34:43:
In Reply to: But wait... there's more... posted by Greg Hudson (Melbourne Australia) on October 02, 1998 at 01:24:01:
Gasoline is a mix of hydrocarbons. They don't ionize for shit! Gasoline can however carry a stactic charge which can be disastrous.
Re deionized water. Everyone is right in saying that a DI plant will not fit on the end of a hose. I work in semiconductors. Our DI plant costs several million dollars and takes up a small building. You probably wouldn't want to wash a car with DI even if you could get it as it is highly corrosive.
If you have hard water and want ot get rid of water spots on glass surfaces, try acidifying the cleaning solution. Mineral resiudues are typically present as metal hydroxides, and are more soluble in acids than in typical basic cleaning suolutions such as ammonia. Another problem causing water spots could be a high silica concentration in water. Silicon can be present as either solble silicate salts or colloidal silica. Shifting the pH from acidic to basic can upset the equilibium between silcates and silica and lead to the increase in the amount of insoluble silica present.
Acidification of general washing solutions for your car is not practicel, as you would probably have to re-wax ever time you washed your car and could have corrosion problems from residual acids -- unless you used a volatile acid such as CO2.
We have a number of problems with water residues in semiconductor manufacturing. My advice is to remember that there are two mechanisms to get rid of water -- physical removal and evaporation. every drying step ends with evaporation. Only water evaporates. Everything else that was in the water is left behind on your surface.