酒精為何能降低(氣泡)表面張力 - 酒精
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By Leila
at 2008-07-10T00:00
at 2008-07-10T00:00
Table of Contents
酒精為何能降低(氣泡)表面張力,也就是說酒精會將氣泡變小或消失
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酒精
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By Lucy
at 2008-07-14T17:05
at 2008-07-14T17:05
酒精(C2H5OH)有氫氧端
會跟水分子的氫連結成"鍵"
使水分子跟水分子之間的氫鍵作用力下降
造成表面張力降低
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By Leila
at 2008-07-13T18:27
at 2008-07-13T18:27
溶質濃度對表面張力的影響:
Solutes can have different effects on surface tension depending on their structure:
依照溶質的結構 溶質可以對表面張力有不同的影響:
-No effect, for example sugar
沒有影響表面張力的 例如糖
-Increase of surface tension, inorganic salts
增加表面張力的 例如無機鹽
-Decrease surface tension progressively, alcohols
降低表面張力的 例如酒精
-Decrease surface tension and, once a minimum is reached, no more effect: surfactants
降低表面張力的但是會達一定程度的 例如界面活性劑
What complicates the effect is that a solute can exist in a different concentration at the surface of a solvent than in its bulk. This difference varies from one solute/solvent combination to another.
什麼複雜的影響,這是一個溶質可以存在於不同的濃度在表面的溶劑比在其批量。這種差異不同,從一溶質/溶劑組合到另一個。
水在20攝氏度時的表面張力為0.073N/m。以下數據也都是20°C時的測量數據:
液體表面張力
mN/m
丙酮23.3
苯 28.9
乙醇22.55
n-己烷18.4
甲醇22.60
n-戊烷16.0
聚乙烯36.1
聚醚酮46.0
聚四氟乙烯22.5
汞 476
水 72.75
http://zh.wikipedia.org/wiki/%E8%A1%A8%E9%9D%A2%E5...
http://en.wikipedia.org/wiki/Surface_tension
有一些是我自己翻譯的優!
2008-07-15 18:10:40 補充:
"肥皂能破壞水的表面張力,當肥皂分子進入水中時,具有極性的親水部位,會破壞水分子間的吸引力而使水的表面張力降低..."
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