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Citation: YE Zhiwen. Micelle Aggregation Numbers and Rheological Characterization of C₁₂-3-C₁₂·2Br and C₁₂-3(OH)-C₁₂·2Br in Aqueous Solution[J]. Chinese Journal of Applied Chemistry, ;2012, 29(5): 571-575. doi: 10.3724/SP.J.1095.2012.00285 shu

Micelle Aggregation Numbers and Rheological Characterization of C₁₂-3-C₁₂·2Br and C₁₂-3(OH)-C₁₂·2Br in Aqueous Solution

YE Zhiwen ^,

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Corresponding author: YE Zhiwen,
Received Date: 30 June 2011
Available Online: 13 September 2011
Fund Project: 江苏省表面活性剂与助剂工程研究中心基金资助项目(2009JSS018) (2009JSS018)

The micelle aggregation numbers of C₁₂-3-C₁₂·2Br and C₁₂-3(OH)-C₁₂·2Br were measured by the technique of fluorescence probe.It was found that the concentration of the Gemini surfactants had great influences on their micelle aggregation number,owing to the presence of hydroxyl group in spacer.When the concentrations were set as 5.5cmc,the aggregation number of C₁₂-3(OH)-C₁₂·2Br was 44.7 and was much greater than that of C₁₂-3-C₁₂·Br(33.2).The two surfactants followed the Newtonian flow with their shear rates γ in the range of 0~1 875 s^-1 for the concentrations of C₁₂-3-C₁₂·2Br and C₁₂-3(OH)-C₁₂·2Br up to 64 mmol/L and 54 mmol/L,respectively.Beyond these,the shear rates are higher than their critical values(γ^*) and then the flow transformed from Newtonian to non-Newtonian modes.In addition,the viscosity η increased with the increase of concentration accompanied with a sharp increase.It was found that the introduction of -OH into the spaces has barely effect on their flow behaviors but cause a slight increase of η.
- Gemini surfactant,
- micelle aggregation number,
- rheological characterization,
- spacer effect
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Micelle Aggregation Numbers and Rheological Characterization of C12-3-C12·2Br and C12-3(OH)-C12·2Br in Aqueous Solution

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Micelle Aggregation Numbers and Rheological Characterization of C₁₂-3-C₁₂·2Br and C₁₂-3(OH)-C₁₂·2Br in Aqueous Solution