TY - JOUR
T1 - Interfacial tension studies of crown ethers at air/water and hexane/water interfaces
AU - Azizian, Saeid
AU - Kashimoto, Kaoru
AU - Matsuda, Takashi
AU - Matsubara, Hiroki
AU - Takiue, Takanori
AU - Aratono, Makoto
N1 - Funding Information:
S. Azizian acknowledges Professor M. Aratono for providing the conditions and invitation to carry out the experiments in Kyushu University and also the support from the Japan Society for Promotion of Science (JSPS) for providing a postdoctoral fellowship (No. P05137) at Kyushu University. This work was supported partly by the Grant-in-Aid for Science Research (B) (No. 16350075).
PY - 2007/12/1
Y1 - 2007/12/1
N2 - The adsorption of phase transfer catalysts, 18-crown-6 and dicyclohexano-18-crown-6, at the air/water and the hexane/water interfaces were investigated. Interfacial tension σ decreased by increasing concentrations of these compounds and therefore both of these crown ethers are accumulated at interfaces. The variation of σ with concentration for both compounds follows the Szyszkowski equation very well, from which the values of saturated surface densities and interaction parameters have been evaluated. On the basis of occupied surface area of each molecule, the orientation of each of molecules at the air/water and the hexane/water interfaces have been proposed. The present results show that dicyclohexano-18-crown-6 has the higher tendency not only to dissolve into the hexane phase but also to adsorb at the hexane/water interface than 18-crown-6 and that the Starks extraction mechanism was suggested for the present phase transfer catalysis systems.
AB - The adsorption of phase transfer catalysts, 18-crown-6 and dicyclohexano-18-crown-6, at the air/water and the hexane/water interfaces were investigated. Interfacial tension σ decreased by increasing concentrations of these compounds and therefore both of these crown ethers are accumulated at interfaces. The variation of σ with concentration for both compounds follows the Szyszkowski equation very well, from which the values of saturated surface densities and interaction parameters have been evaluated. On the basis of occupied surface area of each molecule, the orientation of each of molecules at the air/water and the hexane/water interfaces have been proposed. The present results show that dicyclohexano-18-crown-6 has the higher tendency not only to dissolve into the hexane phase but also to adsorb at the hexane/water interface than 18-crown-6 and that the Starks extraction mechanism was suggested for the present phase transfer catalysis systems.
UR - http://www.scopus.com/inward/record.url?scp=34948903752&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34948903752&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2007.07.068
DO - 10.1016/j.jcis.2007.07.068
M3 - Article
C2 - 17714725
AN - SCOPUS:34948903752
SN - 0021-9797
VL - 316
SP - 25
EP - 30
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 1
ER -