STEM与日常科技·英语30篇（7）

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不粘锅背后的隐藏科学

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