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Dai D, Cao B, Hao XL, Yu ZW. Transition Mechanism from the Metastable Two-Dimensional Gel to the Stable Three-Dimensional Crystal of Imidazolium-Based Ionic Liquids. J Phys Chem B 2023; 127:7323-7333. [PMID: 37560895 DOI: 10.1021/acs.jpcb.3c02720] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
One important quest for making high quality materials with amphiphiles is to understand how a disordered self-assembly changes to a stable crystalline state. Herein, we addressed the basic question by investigating the phase transition mechanism of imidazolium-based ionic liquid (IL) [C16mim]Br, using time-resolved small- and wide-angle X-ray scattering (SAXS-WAXS), differential scanning calorimetry, and Fourier transform infrared spectroscopy techniques. Totally, a hexagonal phase, two lamellar-gel phases, and three lamellar-crystalline phases were observed, showing the special polymorphism of the system. It was demonstrated that at low concentrations the two-dimensional gel phase (Lβ1) transforms into the most stable lamellar-crystal phase (Lc3) through two intermediate crystalline phases Lc1 and Lc2. At high concentrations, the Lβ1 phase changes to a condensed lamellar gel phase (Lβ2) before changing to Lc2 and eventually to Lc3. Comparative studies using [C16mim]Cl and [C16mim]NO3 unveiled that the interactions between the counterions and the headgroups of the IL, as well as the dehydration process, govern the nucleation process of Lc3 and thus the formation of the crystal. The in-depth investigation on the transition mechanism and the phase polymorphism in the present work advances our understanding of the crystallization of amphiphilic ionic liquids in dispersions and would promote future applications.
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Affiliation(s)
- Dong Dai
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Bobo Cao
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Xiao-Lei Hao
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Zhi-Wu Yu
- MOE Key Laboratory on Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
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2
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An investigation of the optical properties and water splitting potential of the coloured metallic perovskites Sr1−Ba MoO3. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2015.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Joseph LR, Tata BVR, Sreejith L. Crystalline fibrillar gel formation in aqueous surfactant-antioxidant system. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2015; 38:84. [PMID: 26248701 DOI: 10.1140/epje/i2015-15084-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Revised: 04/14/2015] [Accepted: 06/03/2015] [Indexed: 06/04/2023]
Abstract
Cetyltrimethylammonium bromide (CTAB) is a well-known cationic surfactant capable to micellize into diverse morphologies in aqueous medium. We observed the formation of an opaque gel state from aqueous CTAB solution in the presence of the aromatic additive, para-coumaric acid (PCA). Optical microscopic images revealed the presence of large fibrils in the system at room temperature. Gel nature of the fibrils was confirmed by rheological measurements. Presence of interstitial water in the fibrils was recognized with Raman spectroscopy. On heating the sample above 30 (°) C, the fibrillar gel state changes to a transparent liquid state with Newtonian flow properties. Dynamic light scattering study hinted the presence of small micelles in the solution above 30 (°) C. Thus the system showed a temperature-dependent structural transition from opaque water-swollen gel to transparent micellar liquid. The formation of water-swollen fibrillar network is attributed to surfactant-additive intermolecular interactions in aqueous medium. Transition to micelle phase above 30 (°) C is related to Kraft transition which is observed at significantly lower temperature for CTAB in the absence of PCA. The structural features of PCA play a key role in promoting fibrillar network formation and elevating the Kraft transition in aqueous solution of CTAB.
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Affiliation(s)
- Linet Rose Joseph
- Soft Materials Research Laboratory, Department of Chemistry, National Institute of Technology, Calicut, India
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4
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Faunce CA, Paradies HH. Two Dimensional Crystallization of Three Solid Lipid A-Diphosphate Phases. J Phys Chem B 2014; 118:800-11. [DOI: 10.1021/jp408282x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chester A. Faunce
- The University of Salford, Joule Physics
Laboratory, Faculty of Science, Engineering
and Environment, Manchester M5 4 WT, United Kingdom
| | - Henrich H. Paradies
- The University of Salford, Joule Physics
Laboratory, Faculty of Science, Engineering
and Environment, Manchester M5 4 WT, United Kingdom
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Müller W, Déjugnat C, Diat O, Zemb T. Effects of Alkaline Cations on Self-assembly of Cetylpyridinium Surfactants. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Here we study the influence of alkaline cations on the self-assembly of cetylpyridinium chloride and cetylpyridinium nitrate. It is known that the anionic counterions have a strong influence on the solubility and self-assembly properties of cationic surfactants. However, in this paper we will show that monovalent cations have also an influence which is weaker but detectable. Scattering techniques (X-Ray, light) were used to obtain structural information about the aggregation as a function of the temperature and the ionic strength. The results are interpreted in terms of ion pair adsorption at the micellar interface, depending on the ionic strength.
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Affiliation(s)
- W. Müller
- ICSM – UMR 5257 (CEA, CNRS, UM2, ENSCM), Bagnols-sur-Cèze, France
| | - Ch. Déjugnat
- ICSM – UMR 5257 (CEA, CNRS, UM2, ENSCM), Bagnols-sur-Cèze, France
- IMRCP – UMR 5623, Université Paul Sabatier, Toulouse, France
| | - O. Diat
- ICSM – UMR 5257 (CEA, CNRS, UM2, ENSCM), Bagnols-sur-Cèze, France
| | - Th. Zemb
- ICSM – UMR 5257 (CEA, CNRS, UM2, ENSCM), Bagnols-sur-Cèze, France
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Müller W, Déjugnat C, Zemb T, Dufrêche JF, Diat O. How Do Anions Affect Self-Assembly and Solubility of Cetylpyridinium Surfactants in Water. J Phys Chem B 2013; 117:1345-56. [DOI: 10.1021/jp3093622] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Wolfram Müller
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Christophe Déjugnat
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Thomas Zemb
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Jean-François Dufrêche
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Olivier Diat
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
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Wu FG, Yu JS, Sun SF, Sun HY, Luo JJ, Yu ZW. Stepwise ordering of imidazolium-based cationic surfactants during cooling-induced crystallization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7350-7359. [PMID: 22537254 DOI: 10.1021/la300739x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surfactants bearing imidazolium cations represent a new class of building blocks in molecular self-assembly. These imidazolium-based cationic surfactants can exhibit various morphologies during phase transformations. In this work, we studied the self-assembly and phase behavior of 1-hexadecyl-3-methylimidazolium chloride (C(16)mimCl) aqueous dispersions (0.5-10 wt %) by using isothermal titration calorimetry, differential scanning calorimetry, synchrotron small- and wide-angle X-ray scattering, freeze-fracture electron microscopy, optical microscopy, electrical conductance, and Fourier transform infrared spectroscopy. It was found that C(16)mimCl in aqueous solutions can form two different crystalline phases. At higher C(16)mimCl concentrations (>6 wt %), the initial spherical micelles convert directly to the stable crystalline phase upon cooling. At lower concentrations (0.5 or 1 wt %), the micelles first convert to a metastable crystalline phase upon cooling and then transform to the stable crystalline phase upon further incubation at low temperature. The electrical conductance measurement reveals that the two crystalline phases have similar surface charge densities and surface curvatures. Besides, the microscopic and spectroscopic investigations of the two crystalline phases suggest that the metastable crystalline phase has preassembled morphology and a preordered submolecular packing state that contribute to the final stable crystalline structure. The formation of a preordered structure prior to the final crystalline state deepens our understanding of the crystallization mechanisms of common surfactants and amphiphilic ionic liquids and should thus be widely recognized and explored.
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Affiliation(s)
- Fu-Gen Wu
- Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology, Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, PR China
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Wu FG, Wang NN, Zhang QG, Sun SF, Yu ZW. Crystallization from the micellar phase of imidazolium-based cationic surfactants. J Colloid Interface Sci 2012; 374:197-205. [DOI: 10.1016/j.jcis.2012.01.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 01/25/2012] [Accepted: 01/25/2012] [Indexed: 11/24/2022]
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9
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Wu FG, Yu ZW, Ji G. Formation and transformation of the subgel phase in dioctadecyldimethylammonium bromide aqueous dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:2349-56. [PMID: 21329372 DOI: 10.1021/la1049474] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We have characterized the structure and phase behavior of dioctadecyldimethylammonium bromide (DODAB) aqueous dispersions by using conventional and high-sensitivity nano-differential scanning calorimetry, microscopy, cryogenic transmission electron microscopy, attenuated total reflection Fourier transform infrared spectroscopy, and electric conductivity measurements. Special attention has been paid to the formation and transformation of the subgel phase. An almost pure subgel can be obtained in the dilute region (below 7.5 mM), while an almost pure coagel phase can be obtained in the concentrated region (above 6.7 wt %). We found that unilamellar vesicles were spontaneously formed in the subgel phase of a 5 mM DODAB dispersion. Infrared spectroscopic data reveal that the only significant change during the gel to subgel phase transition is the ordering in the lipid alkyl chain packing. That is, the head and tail parts of the DODAB molecules change nonsynchronously upon the gel to subgel transition, and the subgel phase is triggered only by the change of the lipid tail part. We propose that the morphological change (from curled membranes in the gel phase to unilamellar vesicles with faceted surface in the subgel phase) is coupled to the change of alkyl chain packing state during the gel to subgel transition. Finally, a full picture of the phase transition sequences for the dilute and concentrated DODAB dispersions is given.
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Affiliation(s)
- Fu-Gen Wu
- Key Laboratory of Bioorganic Phosphorous Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University , Beijing 100084, P. R. China
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Kumagai N, Ni L, Irie H. A visible-light-sensitive water splitting photocatalyst composed of Rh3+in a 4d6electronic configuration, Rh3+-doped ZnGa2O4. Chem Commun (Camb) 2011; 47:1884-6. [DOI: 10.1039/c0cc03739g] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Sasaki S. Transformation Relationships among Monomers, Micelles, Metastable Solid, and Stable Solid in Aqueous Cetylpyridinium Chloride Solution. J Phys Chem B 2010; 114:11039-45. [DOI: 10.1021/jp103293x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shigeo Sasaki
- Department of Chemistry, Faculty of Sciences, Kyushu University, 33 Hakozaki, Higashi ku, Fukuoka 812, Japan
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