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Positive photoresists are composed of a novolac resin, ethyl lactate solvent, and Diazonaphthaquinone (DQ) as the photoactive compound. [9] Positive photoresist reacts with light to cause the polymer to break down and become soluble in a developer solution. Positive resist has better resistance to etchant than negative photoresist.
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One very common positive photoresist used with the I, G and H-lines from a mercury-vapor lamp is based on a mixture of diazonaphthoquinone (DNQ) and novolac resin (a phenol formaldehyde resin). DNQ inhibits the dissolution of the novolac resin, but upon exposure to light, the dissolution rate increases even beyond that of pure novolac.
Toleriane Double Repair oil-Free Daily Facial Moisturizer . amazon.com. $23.99. Treatment Options for Sallow Skin . There are ways to remedy sallow skin, if you think you may be dealing with the ...
Photorejuvenation is a skin treatment that uses lasers, intense pulsed light, or photodynamic therapy to treat skin conditions and remove effects of photoaging such as wrinkles, spots, and textures. The process induces controlled wounds to the skin. This prompts the skin to heal itself, by creating new cells.
Common Wrinkles Appearing on the Face. Dynamic wrinkles that form in the outer corners of the eyes are often called crow’s feet. The folds between your eyebrows that show up when you furrow your ...
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