Actually 70% isopropyl is a better disinfectant. Alcohol works as a disinfectant by denaturing proteins, a small amount of water makes it more efficient.
The presence of water is a crucial factor in destroying or inhibiting the growth of pathogenic microorganisms with isopropyl alcohol. Water acts as a catalyst and plays a key role in denaturing the proteins of vegetative cell membranes. 70% IPA solutions penetrate the cell wall more completely which permeates the entire cell, coagulates all proteins, and therefore the microorganism dies. Extra water content slows evaporation, therefore increasing surface contact time and enhancing effectiveness. Isopropyl alcohol concentrations over 91% coagulate proteins instantly. Consequently, a protective layer is created which protects other proteins from further coagulation.
https://forums.anandtech.com/threads/isopropyl-alcohol-70-or-91.323440/
也有人说混合两者使用效果更好。
想听听大家的看法
Actually 70% isopropyl is a better disinfectant. Alcohol works as a disinfectant by denaturing proteins, a small amount of water makes it more efficient.
应该是合适的浓度。
小时候看的《十万个为什么》里面解释过。
拿的70%的
我都是拿的91%的，故意的。
这东西家里一直都有，只是现在只剩小半瓶了，再买一瓶以备急用而已。
我都是拿来做溶剂用的，清洗一些难去除脏东西的小玩意，十有八九用不着拿来消毒用，需要拿来消毒的时候兑一点水就行了。
我看了一下，80度的伏特加其实酒精含量40%。
65度的二锅头，如果这个65度是按容积计算的话，那么就相当于 130 proof。
The presence of water is a crucial factor in destroying or inhibiting the growth of pathogenic microorganisms with isopropyl alcohol. Water acts as a catalyst and plays a key role in denaturing the proteins of vegetative cell membranes. 70% IPA solutions penetrate the cell wall more completely which permeates the entire cell, coagulates all proteins, and therefore the microorganism dies. Extra water content slows evaporation, therefore increasing surface contact time and enhancing effectiveness. Isopropyl alcohol concentrations over 91% coagulate proteins instantly. Consequently, a protective layer is created which protects other proteins from further coagulation.