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Li Y, Li H, Chai J, et al. Properties and ionic self-assembled structures from mixture of a bola-type strong alkali dication and a branched phosphoric acid. J Colloid Interface Sci. 2016;472:157-66doi: 10.1016/j.jcis.2016.03.047.
Li, Y., Li, H., Chai, J., Chen, M., Yang, Q., & Hao, J. (2016). Properties and ionic self-assembled structures from mixture of a bola-type strong alkali dication and a branched phosphoric acid. Journal of colloid and interface science, 472157-66. https://doi.org/10.1016/j.jcis.2016.03.047
Li, Yan, et al. "Properties and ionic self-assembled structures from mixture of a bola-type strong alkali dication and a branched phosphoric acid." Journal of colloid and interface science vol. 472 (2016): 157-66. doi: https://doi.org/10.1016/j.jcis.2016.03.047
Li Y, Li H, Chai J, Chen M, Yang Q, Hao J. Properties and ionic self-assembled structures from mixture of a bola-type strong alkali dication and a branched phosphoric acid. J Colloid Interface Sci. 2016 Jun 15;472:157-66. doi: 10.1016/j.jcis.2016.03.047. Epub 2016 Mar 21. PMID: 27031597.
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J Colloid Interface Sci. 2016 Jun 15;472:157-66. doi: 10.1016/j.jcis.2016.03.047. Epub 2016 Mar 21.

Properties and ionic self-assembled structures from mixture of a bola-type strong alkali dication and a branched phosphoric acid.

Journal of colloid and interface science

Yan Li, Hongguang Li, Jinling Chai, Mengjun Chen, Qiao Yang, Jingcheng Hao

Affiliations

  1. College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, Shandong Province 250014, China.
  2. State Key Laboratory of Solid Lubrication & Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, Gansu Province 730000, China. Electronic address: [email protected].
  3. College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan, Shandong Province 250014, China. Electronic address: [email protected].
  4. Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, Shandong Province 250100, China.

PMID: 27031597 DOI: 10.1016/j.jcis.2016.03.047

Abstract

Ionic self-assembled structures have been prepared successfully between di-(2-ethylhexyl) phosphoric acid (DEHPA) and hexamethonium hydroxide (HMO(OH)2). The DEHPA/HMO(OH)2 complexes show good surface activity at a wide mixing molar ratio of DEHPA to HMO(OH)2 (ρ), within which the critical micellar concentration (cmc) is far below that of any single component. In bulk aqueous solutions, rich phase behavior was observed by varying cDEHPA and cHMO(OH)2. When the concentration of HMO(OH)2 is in the range of 10-100 mmol L(-1), isotropic L1 phases, birefringent Lα phases and a phase-separated region were successively observed with increasing cDEHPA. At high cHMO(OH)2 range (>78 mmol L(-1)), a narrow L1/Lα two-phase region with the Lα phase at the bottom was noticed between the single L1 and single Lα phase regions. The rheological properties of the samples in the single Lα phase region at 2.6 ⩽ ρ ⩽ 2.8 are quite similar. Cryo-TEM and freeze-fracture TEM (FF-TEM) observations revealed the presence of multilamellar vesicles with flexible and even branched bilayers. At 2.2 ⩽ ρ ⩽ 2.6, however, the rheological properties are highly sensitive to ρ due to the sophisticated self-assembly behavior as proved by imaging studies and (2)H NMR measurements. Closely-stacked flat structures which look like foams or cellular networks have been newly discovered. Interestingly, NaCl could arouse an L1 to Lα phase transition due to the suppression of the effective area of the hydrophilic headgroups of the ionic complexes, leading to an increase of the critical packing parameter p. The viscoelasticity properties of the salt-containing Lα phases decreased with increasing salinity. We hope our research can provide new ideas for the construction of supramolecular materials by surfactant ionic self-assembly (SISA) strategy.

Copyright © 2016 Elsevier Inc. All rights reserved.

Keywords: Cryo-TEM; FF-TEM; Ionic self-assembly; L(α) phases; Rheological properties; Surfactant

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