Studies on the Hydrodynamic Diameter and Aggregation Number of Nonionic Switchable Surfactant

Guang Li; Sen Lin Tian; Jian Long; Yan Hua Niu; Shu Jiao Zhan

doi:10.4028/www.scientific.net/AMR.726-731.1638

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 726-731Studies on the Hydrodynamic Diameter and...

Studies on the Hydrodynamic Diameter and Aggregation Number of Nonionic Switchable Surfactant

Abstract:

An Investigation of the micelle aggregation number (N) and hydrodynamic diameter (D_h) is conducted on nonionic switchable surfactant 11-ferrocenylundecyl polyoxyethylene ether (FPEG), the micelle aggregation number of FPEG solution is determined by steady-state fluorescence probe, the results show that the micelle aggregation number (N) increase linearly with the concentration range from 5 to 12 times CMC of FPEG solutions. The critical micelle aggregation number N_m which means that the aggregation number of surfactant at the concentration of CMC is calculated to be 66. The hydrodynamic diameter (D_h) of FPEG micelle is determined by dynamic light scattering (DLS), the measurement angle is fixed at 90°and the wavelength is 532nm, the distribution data analyses by NNLS (non-negatively constrained least square) algorithm, the results reveal that the mean value of D_h at the concentration of 0.5 mmolL^-1 is 7.8nm. the POLY value, which used to explain the micelle polydispersity in the aqueous solution, is measured and the results show that the POLY values are slightly different, this indicates that the micelle aggregation morphology of FPEG is polydispersity in the aqueous solution.

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Periodical:

Advanced Materials Research (Volumes 726-731)

Pages:

1638-1642

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.726-731.1638

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Online since:

August 2013

Authors:

Guang Li, Sen Lin Tian, Jian Long, Yan Hua Niu, Shu Jiao Zhan

Keywords:

Dynamic Light Scattering, Hydrodynamic Diameter, Micelle Aggregation Number, Nonionic Switchable Surfactant, Steady-State Fluorescence Probe

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