Reverse Micelle Formation of Triton X-100 in Butanol andn-Heptane Mixed Solvents Studied by the Positron Annihilation Technique
✍ Scribed by Subir Kumar Das; B.Nandi Ganguly
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 116 KB
- Volume
- 192
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
with the mixed solvents of n-heptane-butanol, the phase The positron annihilation technique (PAT) has been applied to behavior and stable microemulsion formation possibility study the molecular association phenomenon of Triton X-100 (TXhave been worked out very recently (9), which steered us 100) and formation of reversed micelles in the mixed solvent of to attempt on the systematics of the aggregation behavior in butanol and n-heptane. The results indicate the sensitivity of posithe same nonaqueous phase. tronium (Ps) parameters to the phase transition region due to the Positron annihilation technique is a sensitive spectroself-aggregation phenomenon of TX-100 within the system. The scopic tool to investigate the microphase transitional behavintensity of the long-lived ortho-Ps component, I 3 , and its lifetime,
ior and corresponding structural changes associated in such t 3 , show a remarkable change at a critical concentration of the media (10-12). It is the bound state of (e / e 0 ), the positrosurfactant at Ç1.5 mM coined as the operational CMC of TX-100 in both (1:1) and (1:2) butanol-n-heptane (BuHp) systems. The nium (Ps) atom, its reaction and formation, which plays narrow component/para-Ps intensity as computed from Doppler the key role in elucidating the structural changes associated broadening of annihilation radiation indicates discernable changes within the medium 13). Parameters such as the orthoat the same concentration region ( Ç1.5 mM) of TX-100 in the Ps lifetime component (vide its pick-off lifetime) and its system. Further, microphase changes due to the association of intensity and the Doppler broadening of annihilation radiawater molecules within the nonaqueous phase has been studied by tion (DBAR) are greatly dependent on the electronic envi-Ps parameters, which reveals a clear demarcation of the polar and ronment of the medium; therefore, our intention has been to nonpolar zones.