کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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608246 | 1454606 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Micelle to vesicle transitions of N-dodecyl-1, ω-diaminoalkanes: Effects of pH, temperature and salt Micelle to vesicle transitions of N-dodecyl-1, ω-diaminoalkanes: Effects of pH, temperature and salt](/preview/png/608246.png)
The self-assembly behavior of pH-sensitive amphiphiles N-dodecyl-1, 2-diaminoethane (C12N2N), N-dodecyl-1, 3-diaminopropane (C12N3N) and N-dodecyl-1, 4-diaminobutane (C12N4N) has been studied in aqueous solutions. Light scattering, viscosity and cryo-transmission electronic microscopy (cryo-TEM) results revealed that the aggregates transferred from spherical micelles to vesicles (MVT) via wormlike micelles as the pH was gradually varied from acidic to basic conditions. pH-dependent zeta potential and 1H NMR studies confirmed these transitions. Interestingly, the formed wormlike micelles could transform into vesicles upon heating, which was studied by cryo-TEM, light scattering and viscosity techniques in detail. It is concluded that the pH and thermal MVT are a general phenomenon in all three amphiphiles investigated. Furthermore, NaCl induced a wormlike micelle to vesicle transition was also observed in C12N2N solution.
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► New N-dodecyl-1, ω-diaminoalkane amphiphiles have been synthesized.
► pH-induced spherical micelle to vesicle transition via wormlike micelle was observed.
► Temperature and NaCl-induced wormlike micelle to vesicle transitions were observed.
Journal: Journal of Colloid and Interface Science - Volume 380, Issue 1, 15 August 2012, Pages 83–89