Adsorption of Alkyltrimethylammonium Bromide and Alkylpyridinium Chloride Surfactant Series on Polytetrafluoroethylene Powder
✍ Scribed by Ajay K. Vanjara; Sharad G. Dixit
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 108 KB
- Volume
- 177
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
Yao and Strauss (4) studied adsorption of quarternary
The adsorption and zeta potential of three different alkyltriammonium surfactants onto chromatographic beads of PTFE methylammonium bromides, CTAB, TTAB, and DTAB, and two from methanol solution. It was found that whereas one-and alkylpyridinium chlorides, CPC and DPC, on a PTFE surface two-chain alkyl surfactants exhibit saturation, the triplewere studied. Adsorption isotherms having characteristics similar chain surfactant does not. This was attributed to the formato those of two plateau regions were observed for all these surfaction of a monolayer in the cases of single-and double-chain tants. In the case of alkyltrimethylammonium bromide, there is a alkyl surfactants. In the absence of hydration, the adsorbate considerable effect of chain length which could be attributed to was immobile at all surface densities as it lay flat on the the arrangement of surfactant molecules being tilted away from PTFE surface. The hydrated adsorbate exhibits mobility at the perpendicular. In the case of alkylpyridinium surfactants, an insignificant effect of chain length is due to a predominantly per-full surface coverage because surfactant chains are packed pendicular arrangement. The thermodynamics of hemimicellizanormal to the surface as in the case of a triple-chain surfaction has been described by evaluating n hm as well as free energy tant. The above authors (5) found that only the vertically of hemimicellization.