Solubilization of octafluoronaphthalene by mixed micelles of fluorocarbon and hydrocarbon surfactants in aqueous solutions

1996 ◽  
Vol 73 (1) ◽  
pp. 21-25 ◽  
Author(s):  
Tsuyoshi Asakawa ◽  
Junichiro Ikehara ◽  
Shigeyoshi Miyagishi
Keyword(s):  
Aqueous Solutions ◽  
Mixed Micelles

Mixed micelles of poly(styrene-b-3-(methacryloylamino)propyltrimethylammonium chloride-b-ethylene oxide) and anionic amphiphiles in aqueous solutions

2010 ◽  
Vol 88 (3) ◽  
pp. 208-216 ◽  
Author(s):  
Jingjing Liu ◽  
Airi Yoneda ◽  
Dian Liu ◽  
Yuuichi Yokoyama ◽  
Shin-ichi Yusa ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Aqueous Solutions ◽  
Mixed Micelles ◽  
Organic Dyes ◽  
Sodium Dodecyl ◽  
Degree Of Polymerization ◽  
Hydrodynamic Diameter ◽  
Low Concentration ◽  
Fluorescence Measurements ◽  
Kinetics Of

The micelles of poly(styrene-b-3-(methacryloylamino)propyltrimethylammonium chloride-b-ethylene oxide) (PS-b-PMAPTAC-b-PEO) have been successfully prepared in aqueous solutions. The micelles have a PS core, cationic PMAPTAC shell, and PEO corona. Due to the short PS chain (degree of polymerization = 8), the formation of micelles is difficult at a low concentration, and the micelles are detected only at concentrations higher than 1 g L–1. The addition of anionic amphiphiles, such as sodium dodecyl sulfate (SDS) and poly(methacrylic acid) (PMAA), induces the formation of mixed micelles at a low concentration level of the polymer (~0.005 g L–1). This can be ascribed to insolubilization of the cationic PMAPTAC block due to charge neutralization by the anionic amphiphiles. The binding of SDS or PMAA to the PMAPTAC block is confirmed by zeta-potential measurements. The mixed micelles are characterized by dynamic light scattering (DLS), scanning electron microscopy (SEM), and fluorescence measurements. Based on DLS measurements, it is revealed that the hydrodynamic diameter of the mixed micelles falls in the range of 120–130 nm. SEM measurements provided clear pictures of mixed micelles with a spherical morphology. The kinetics of exchange of organic dyes between the micelle particles was investigated by fluorescence techniques. The result indicates that the exchange of the dyes between the micelle particles takes places within a time scale of seconds.

Thermodynamic and microscopic properties of AOT/Dynol-604 mixed micelles in aqueous solutions

2015 ◽  
Vol 387 ◽  
pp. 50-58 ◽  
Author(s):  
Dongxing Cai ◽  
Changfei Du ◽  
Tianxiang Yin ◽  
Peizhu Zheng ◽  
Weiguo Shen
Keyword(s):  
Aqueous Solutions ◽  
Mixed Micelles

The inter-micellar interaction enthalpies of DTAB/TX100 mixed micelles and their structural transitions

Soft Matter ◽  
2017 ◽  
Vol 13 (35) ◽  
pp. 5888-5896 ◽  
Author(s):  
Handi Yin ◽  
Peizhu Zheng ◽  
Jihua Zhao ◽  
Weiguo Shen
Keyword(s):  
Aqueous Solutions ◽  
Isothermal Titration Calorimetry ◽  
Mixed Micelles ◽  
Titration Calorimetry ◽  
Mixed Surfactant ◽  
Structural Transitions ◽  
Heats Of Mixing ◽  
Flow Mixing

The heats of mixing for a series of DTAB/TX100 mixed surfactant aqueous solutions were measured by flow-mixing calorimetry and isothermal titration calorimetry (ITC) at 298.15 K and 85 kPa, which were used to calculate the inter-micellar interaction enthalpies (−ΔHC).

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