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The optional second step (for bare silicon wafers) is a short immersion in a 1:100 or 1:50 solution of aqueous HF (hydrofluoric acid) at 25 °C for about fifteen seconds, in order to remove the thin oxide layer and some fraction of ionic contaminants. If this step is performed without ultra high purity materials and ultra clean containers, it ...
For glass containers, the goal of surface dealkalization is to render the inside surface of the container more resistant to interactions with liquid products later put inside it. Since the treatment is directed primarily at changing the properties of the inside surface in contact with the product, it is also referred to as "internal treatment".
Ground glass joints are translucent when clean and free of debris. Solvents, reaction mixtures, and old grease appear as transparent spots. Grease can be removed by wiping with an appropriate solvent; ethers , methylene chloride , ethyl acetate , or hexanes work well for silicone - and hydrocarbon -based greases.
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If Silly Putty is submerged in warm or hot water, it will become softer and thus "melt" much faster. It also becomes harder to remove small amounts of it from surfaces. After a long period of time, it will return to its original viscosity. [6] Silly Putty is sold as a 13 g (0.46 oz) piece of clay inside an egg-shaped plastic container.
A simple gas bubbler containing silicone oil Gas bubblers in two sizes. A gas bubbler is a piece of laboratory glassware which consists of a glass bulb filled with a small amount of fluid—usually mineral or silicone oil, less commonly mercury. The inlet to the bulb is connected to a ground glass joint, while the outlet is vented to the air.
To keep your flour safe from any weevils already present in your pantry, Quoc Le suggests using airtight containers made of glass, metal, or a strong plastic. "There should be no openings or ...
The Getty Villa art museum is threatened by the flames of the wind-driven Palisades Fire in Pacific Palisades, California, Jan. 7, 2025. A fast-moving brushfire in a Los Angeles suburb burned ...
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