| Summary: | 碩士 === 中國文化大學 === 應用化學研究所 === 88 === Experimental results show that the surface tension of shampoo appears to decrease with increasing the concentration of sodium dodecylbenzene sulfonate, and that the viscosity of shampoo increase with increasing the concentration of sodium dodecylbenzene sulfonat, as a result of increased free volume resulting from the intermolecular interaction.
The experimental results also indicate that the contact angle of oil drop on the surface of the glass plat is seen to increase with increasing the concentration of sodium dodecylbenzene sulfonat. Although the contact angle of oil drop on the glass surface is smaller than 90∘, it is considered to possess partially efficacy of removing oil stain. In order to increase the capability of removing oil stain, we tried to increase the concentration of sodium chloride and to fix the concentration of other ingredients used in the formulation of shampoo. It was found that the viscosity of shampoo is seen to increase with increasing the concentration of sodium chloride, as a result of the intermolecular interaction. It is seen that the contact angle of oil drop on the glass surface appears not to increase with an increase of the concentration of sodium chloride, indicating that use of sodium chloride in the formulation of shampoo has no efficacy of removing oil stain.
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