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Yin T, Qin M, Yang Y, Zheng P, Fan D, Shen W. The interactions of ι-carrageenan with cationic surfactants in aqueous solutions. SOFT MATTER 2014; 10:4126-36. [PMID: 24752291 DOI: 10.1039/c4sm00322e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The interactions between the anionic polymer ι-carrageenan (IC) and the cationic surfactants 1-dodecyl-3-methylimidazolium bromide (C12mimBr), dodecyltrimethylammonium bromide (DTAB) and ethyl-α,ω-bis(dodecyldimethylammonium)dibromide (12-2-12) have been studied by fluorimetry and isothermal titration calorimetry. Our experimental results showed that at a low surfactant concentration, the monomers adsorbed on the IC chains through the electrostatic attraction, followed by the formation of induced micelles on the IC chains through the hydrophobic interaction until the IC chains are saturated by surfactant molecules; after that the added surfactant formed free micelles in the solution. A pseudo-phase-equilibrium thermodynamic model was proposed to explain the experimental results and to understand the mechanisms of the interactions in these three systems. Moreover, the salt effect on the interactions was investigated and found that it changed the critical concentrations but not the interaction mechanism.
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Affiliation(s)
- Tianxiang Yin
- School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
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Zhou C, Cheng X, Yan Y, Wang J, Huang J. Reversible transition between SDS@2β-CD microtubes and vesicles triggered by temperature. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3381-6. [PMID: 24601651 DOI: 10.1021/la500010p] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Switching between association and dissociation is the well-known strategy for constructing responsive materials based on the host-guest complexes of cyclodextrins (CDs). In this work, we report that temperature may also trigger self-assembly transition in the supramolecular system composed of sodium dodecyl sulfate (SDS) and β-cyclodextrin (β-CD) at a molar ratio of 1:2. We reported previously that, at this ratio, SDS and β-CD form a channel-type SDS@2β-CD supramolecular unit, which further self-assembles into non-amphiphilic vesicles and microtubes driven by hydrogen bonding. Here, we report that the vesicles and microtubes can be reversibly switched between each other upon decreasing and increasing temperature. Control experiments in heavy water suggest that water molecules play a dominating role in the hydrogen bonding between SDS@2β-CD supramolecular units at lower concentration and higher temperature. Under opposite conditions, the hydrogen bonding between CDs is dominating. Therefore, for the 5% system, we observed a vesicle to microtube transition with a decreasing temperature, whereas for the 10% system, we observed the reverse process. Both processes are reversible. This is not only an example of temperature-triggered responsiveness in non-amphiphilic self-assemblies but also a new mode of responsiveness for the host-guest inclusion systems based on CDs. This temperature-responsive process is anticipated to shed light on the design and development of novel advanced materials.
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Affiliation(s)
- Chengcheng Zhou
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, People's Republic of China
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Guerrero-Martínez A, Ávila D, J. Martínez-Casado F, Ripmeester JA, Enright GD, Cola LD, Tardajos G. Solid Crystal Network of Self-Assembled Cyclodextrin and Nonionic Surfactant Pseudorotaxanes. J Phys Chem B 2010; 114:11489-95. [DOI: 10.1021/jp105808j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrés Guerrero-Martínez
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
| | - David Ávila
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
| | - Francisco J. Martínez-Casado
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
| | - John A. Ripmeester
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
| | - Gary D. Enright
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
| | - Luisa De Cola
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
| | - Gloria Tardajos
- Physikalisches Institut, Wesfälische Wilhelms Universität Münster, Mendelstrasse 7, D-48149 Münster, Germany, Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, Departamento de Química Física I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain, and Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, Canada
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