Can Soap Get Dirty?
肥皂会变脏吗?
When you see lovely little bars of lemon-thyme or lavender hand soaps on the rim of a sink, you know they are there to make you feel as fresh as a gardenia-scented daisy. We all know washing our hands is important, but, like washcloths and towels, can the bars of hand soap we use to clean ourselves become dirty as well?
当你看到水池边可爱的柠檬百里香或薰衣草香皂时,你就知道它能让你感受到如栀子花香的雏菊般清新动人。众所周知,洗手很重要,但就像毛巾一样,我们用来清洁双手的洗手皂也会变脏吗?
Soaps are simply mixtures of sodium or potassium salts derived from fatty acids and alkali solutions during a process called saponification. Each soap molecule is made of a long, non-polar, hydrophobic (repelled by water) hydrocarbon chain (the "tail") capped by a polar, hydrophilic (water-soluble) "salt" head. Because soap molecules have both polar and non-polar properties, they're great emulsifiers, which means they can disperse one liquid into another.
肥皂仅仅只是由脂肪酸和碱溶液在皂化过程中产生的钠盐或钾盐的混合物。每个肥皂分子都是由一个长而非极性的疏水(被水排斥)碳氢化合物链(“尾巴”)和其顶端的一个极性亲水(水溶性)碳氢化合物盐链构成。由于肥皂分子具有极性和非极性的特性,它们是很好的乳化剂,这意味着它们可以将一种液体溶解到另一种液体中。
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