The surface property and aggregation behavior of a hydrophobically modified cyclodextrin |
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| Authors: | Yan Bai Gui-Ying Xu Hong-Yuan Sun Xiao-Deng Yang Ai-You Hao Jin-Yu Pang Hou-Jian Gong Ming-Qi Ao |
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| Institution: | (1) Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, People’s Republic of China;(2) School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, People’s Republic of China; |
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| Abstract: | The surface property of an amphiphilic cyclodextrin 2-O-(hydroxypropyl-N,N-dimethyl-N-dodecylammonio)-β-cyclodextrin (HPDMA-C12-CD) was investigated using oscillating bubble rheometer and electrical conductivity method at different temperatures. The
surface tension and dilational viscoelasticity of HPDMA-C12-CD were provided. The results showed that HPDMA-C12-CD could adsorb on the air–water interface, which decreased the surface tension of water efficiently. Critical micelle concentration
(cmc) can be clearly defined from the surface tension isotherm. pC20 and π
cmc were derived from the surface tension isotherms as well. The thermodynamic parameters (ΔG
0
m , ΔH
0
m , −TΔS
0
m) derived from electrical conductivity indicated that the micellization of HPDMA-C12-CD was entropy-driven at lower temperature, while it was enthalpy-driven at higher temperature. The dilational modulus appeared
a maximum value while the phase angle appeared two maxima as a function of HPDMA-C12-CD concentration. |
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