STEM与日常科技·英语30篇（7）
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The Hidden Science Behind Non-Stick Pans
不粘锅背后的隐藏科学
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Non-stick coatings like Teflon are made from polytetrafluoroethylene (PTFE), a synthetic polymer.
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Its molecular structure features strong carbon–fluorine bonds that resist heat, chemicals, and adhesion.
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During manufacturing, PTFE is sprayed onto aluminum surfaces and baked at high temperatures.
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A smooth, inert layer forms that prevents food molecules from bonding to the metal surface.
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Newer ceramic coatings use silica nanoparticles instead, offering similar slipperiness without fluorine.
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These alternatives avoid potential concerns about PTFE breakdown above 500°F (260°C).
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However, both types wear down over time if scratched by metal utensils or overheated repeatedly.
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Proper care—like using wooden spoons and medium heat—extends coating life by two to three years.
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Scientists continue testing nanocomposites that self-heal minor surface damage during cooking.
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Ultimately, non-stick technology merges materials science, thermal engineering, and everyday safety.