Surface properties of bolaamphiphiles in ethanol/water mixed solutions
نویسندگان
چکیده
The effect of ethanol on the surface properties of bolaamphiphiles and their mixed systems with oppositely charged conventional surfactants is studied and compared with the corresponding conventional surfactant systems. It is found that both the bolaamphiphile and the conventional surfactant have the similar variation tendency of γcmc and Γ∞ in the single surfactant system. However, in the cationic and anionic mixed surfactants system the γcmc decreases with the ethanol addition in the bolaamphiphile systems. This tendency is reverse to that in conventional surfactant system. Surface activity of the asymmetric bolaamphiphiles SHMC decreases greatly when ethanol is added into the system due to the existence of the hydroxyl group in the SHMC molecule. Adding opposite charged surfactant may greatly increase surface activity in the SHMC/C12NEt3Br/ethanol systems. © 2004 Elsevier B.V. All rights reserved.
منابع مشابه
measurement and correlation of the mean ionic activity coefficient of NaCl in the mixed solvent of water and ethanol
متن کامل
Adsorption and Photocatalytic Properties of Surface-Modified TiO2 nanoparticles for Methyl Orange Removal from Aqueous Solutions
Titanium dioxide nanoparticles surface-modified by 5-sulfosalicylic acid 5-SA-TiO2 were prepared in ethanol by the chemisorption process. The effects of surface improvement on the photocatalytic degradation and adsorption of methyl orange MO were studied in a batch system by considering the various parameters, such as contact time, adsorbent dosage, pH, initial dye concentration and temperature...
متن کاملThe investigation of ionic association in the CdF2 solution with the mixed solvent (water +ethanol +propanol) at 25°C
Using the mixed solvents, (water +ethanol + propanol), the solubility of CdF2 was determined byevaporating method at 25° C. The results showed that the sollbility, s, of CdF2 decreases bydecreasing the dielectric constant of the mixed solvent .Once the solubility of CdF2 was determined,the concentration solubility product, Ksp(c)=4s3, was calculated .Furthermore ,by estimating the meanactivity ...
متن کاملHydrophobic and hydrophilic interactions in aqueous mixtures of alcohols at a hydrophobic surface.
Aqueous solutions of alcohols are interesting because of their anomalous behavior that is believed to be due to the molecular structuring of water and alcohol around each other in solution. The interfacial structuring and properties are significant for application in alcohol purification processes and biomolecular structure. Here we study aqueous mixtures of short alcohols (methanol, ethanol, 1...
متن کامل