계면활성제와 pH 조건에 따른 백모의 팽윤거동과 메커니즘
Swelling Behavior and its Mechanism of White Hair according to Surfactant and pH Conditions
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The purpose of current study is to investigate the swelling behavior and swelling mechanism of white hair under different experimental conditions. Medullary index from swelled hair was also evaluated under various conditions, such as pH of aqueous solution and kinds of surfactants. To understand the swelling behavior, the swelling mechanism under various conditions has also been proposed in this report. The swelling capacity was found to increase significantly with increase in aqueous pH value. As the pH increased, the negative charged surface of hair predominated, resulting in increase in the repulsion of cuticle scales, which in turn increased swelling significantly. With surfactants, the largest swelling was found for anionic surfactant, sodium lauryl surfactant (SLS). The cationic surfactant, cetyl trimethyl ammonium chloride (CTAC) showed better swelling behavior than the nonionics, such as decyl glucoside and saponin. The medullary index showed a lower value with ionic surfactants than that with the nonionic ones. This means the electric double layer of CTAC may affect the total swelling of the hair, but does not destroy the inner crystalline structure of the cortex. The addition of saponin to SLS showed smaller swelling than the SLS alone. We suggest the interactions between sulfate ions of SLS and hydroxyl groups of saponin might be the cause of the reduced swelling. The process of swelling behavior requires further investigation of medullary index for practical application.
Abstract
The purpose of current study is to investigate the swelling behavior and swelling mechanism of white hair under different experimental conditions. Medullary index from swelled hair was also evaluated under various conditions, such as pH of aqueous solution and kinds of surfactants. To understand the swelling behavior, the swelling mechanism under various conditions has also been proposed in this report. The swelling capacity was found to increase significantly with increase in aqueous pH value. As the pH increased, the negative charged surface of hair predominated, resulting in increase in the repulsion of cuticle scales, which in turn increased swelling significantly. With surfactants, the largest swelling was found for anionic surfactant, sodium lauryl surfactant (SLS). The cationic surfactant, cetyl trimethyl ammonium chloride (CTAC) showed better swelling behavior than the nonionics, such as decyl glucoside and saponin. The medullary index showed a lower value with ionic surfactants than that with the nonionic ones. This means the electric double layer of CTAC may affect the total swelling of the hair, but does not destroy the inner crystalline structure of the cortex. The addition of saponin to SLS showed smaller swelling than the SLS alone. We suggest the interactions between sulfate ions of SLS and hydroxyl groups of saponin might be the cause of the reduced swelling. The process of swelling behavior requires further investigation of medullary index for practical application.
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