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Zhuang W, Zhao C, Pan Y, Li Q. Self-assembly of an imidazolium surfactant in aprotic ionic liquids. 2. More than solvents. SOFT MATTER 2021; 17:3494-3502. [PMID: 33657203 DOI: 10.1039/d1sm00039j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
As tailorable solvents, the physiochemical properties of ionic liquids can be tuned by the structure of ions. Herein, we investigate the structural effects of ILs on the self-assembly of surfactants. It has been confirmed that the cationic surfactant 1-hexadecyl-3-methylimidazolium bromide (C16mimBr) can self-assemble into micellar and lamellar lyotropic liquid crystal phases in the aprotic ionic liquid (AIL) 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4). In this work, we explore the aggregation behaviours in AILs with different alkyl chains on the imidazolium group, i.e., 1-propyl-3-methylimidazolium tetrafluoroborate ([Pmim]BF4), 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4), 1-hexyl-3-methylimidazolium tetrafluoroborate ([Hmim]BF4) and 1-octyl-3-methylimidazolium tetrafluoroborate ([Omim]BF4). With the increase of the cation chain length, AILs have better solubility of the solvophobic part of the surfactants and hence a weaker driving force for self-assembly. Therefore, the critical micellization concentration of C16mimBr in AILs increases as confirmed by the surface tension and small angle X-ray scattering characterizations. More interesting things happen to the phase behaviours. Besides the micellar and lamellar lyotropic liquid crystal phases, a hexagonal lyotropic liquid crystal phase is formed in [Pmim]BF4 while hexagonal and bicontinuous cubic lyotropic liquid crystal phases are formed in [Bmim]BF4, [Hmim]BF4 and [Omim]BF4. It is surprising to observe richer phase behaviours in solvents of lower cohesive energy. The detailed structural information of various aggregates has been obtained by small-angle X-ray scattering. It is demonstrated that AILs work as not only solvents but also co-surfactants.
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Affiliation(s)
- Wenchang Zhuang
- School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, P. R. China.
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2
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Li Q, Tong K, Sun M, Yao M, Zhuang W, Pan Y, Chen X. The self-assembly of an imidazolium surfactant in an aprotic ionic liquid. 1. Comparison in aprotic and protic ionic liquids. SOFT MATTER 2020; 16:7246-7249. [PMID: 32726375 DOI: 10.1039/d0sm01246g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The aggregation behaviour of a cationic surfactant in an aprotic ionic liquid has been explored. Prolate micelles are formed at low surfactant concentrations, while a lamellar lyotropic liquid crystal phase is formed at high surfactant concentrations.
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Affiliation(s)
- Qintang Li
- School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
| | - Kun Tong
- Beijing Institute of Aerospace Testing Technology & Beijing Key Laboratory of Research and Application for Aerospace Green Propellants, Beijing 100074, China
| | - Meng Sun
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
| | - Meihuan Yao
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China and National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China
| | - Wenchang Zhuang
- School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
| | - Yue Pan
- School of Materials and Chemical Engineering, Xuzhou University of Technology, Xuzhou 221018, China.
| | - Xiao Chen
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
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3
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Giles LW, Marlow JB, Butler CSG, Turpin GA, de Campo L, Mudie ST, Faul CFJ, Tabor RF. Structural relationships for the design of responsive azobenzene-based lyotropic liquid crystals. Phys Chem Chem Phys 2020; 22:4086-4095. [PMID: 32031185 DOI: 10.1039/c9cp05463d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Light-responsive binary (azobenzene + solvent) lyotropic liquid crystals (LCs) were investigated by structural modification of simple azobenzene molecules. Three benzoic acid-containing azobenzene molecules 4-(4-(hydroxyphenyl)diazenyl)benzoic acid (AZO1), 3-(4-(hydroxyphenyl)diazenyl)benzoic acid (AZO2) and 5-(4-(hydroxyphenyl)diazenyl)isophthalic acid (AZO3) were produced with various amide substitutions to produce tectons with a variety of hydrophobicity, size and branching. The LC mesophases formed by binary (azobenzene + solvent) systems with low volatility solvents dimethylsulfoxide (DMSO) and N,N-dimethylformamide (DMF) as well as the protic ionic liquids ethylammonium formate (EAF) and propylammonium formate (PAF), were investigated using a combination of small-angle X-ray and neutron scattering (SAXS and SANS) as well as polarising light microscopy (PLM). Increasing alkyl group length was found to have a strong influence on LC phase spacing, and changes in the position of substitution on the benzene ring influenced the preferred curvature of phases. UV-induced trans to cis isomerization of the samples was shown to influence ordering and optical birefringence, indicating potential applications in optical devices.
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Affiliation(s)
- Luke W Giles
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia.
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4
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Li X, Zhao K. Phase transition and electrical properties of aggregations of ethoxylated phytosterol surfactants by dielectric spectroscopy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:505402. [PMID: 30465540 DOI: 10.1088/1361-648x/aaebe2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aggregation behaviors of the bio-friendly nonionic phytosterol ethoxylated (BPS-n) surfactants, in water were investigated by dielectric spectroscopy over a frequency range from 40 Hz to 110 MHz. Only the BPS-5 solution system observes dielectric relaxation and we judge this is because due to the difference in the chain length of BPS-n surfactants. Then we further analyze the BPS-5 solution system. Interestingly, we found that BPS-5 lamellar aggregations exist two phases before and after 6%-8% BPS-5 concentration by using the dielectric parameters and the phase parameters obtained by fitting dielectric spectrum and the theoretical model respectively. In addition, we concluded that the change of the electrical parameters such as surface conductivity and zeta potential are related to the lamellar phase structure. Besides, lamellar phases formed at a lower concentration are more stable than those at higher concentration by the thermodynamic analysis.
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Affiliation(s)
- Xue Li
- College of Chemistry, Beijing Normal University, Beijing 100875, People's Republic of China
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5
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Yi S, Wang J, Feng Z, Chen X. "Rigid" Luminescent Soft Materials: Europium-Containing Lyotropic Liquid Crystals Based on Polyoxyethylene Phytosterols and Ionic Liquids. J Phys Chem B 2017; 121:9302-9310. [PMID: 28876934 DOI: 10.1021/acs.jpcb.7b07653] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Soft materials of europium β-diketonate complexes constructed in lyotropic liquid crystals (LLCs) mediated by ionic liquids (ILs) are impressive for their excellent luminescence performance and stability. For the aim to further improve their mechanical processability and luminescent tunablility, the polyoxyethylene phytosterols (BPS-n) were introduced here as structure directing agents to prepare relatively "rigid" lamellar luminescent LLCs in 1-butyl-3-methyl-imidazolium hexafluorophosphate by doping europium β-diketonate complexes with different imidazolium counterions. As a result of the solvophobic sterol ring structure of BPS-n, the more effective isolation and confinement effects of europium complexes could be achieved. The longest fluorescence lifetime and the highest quantum efficiency reported so far for europium containing lyotropic organized soft materials were thus obtained. Changing the molecular structures of BPS-n with different oxyethylene chains or doped complexes with imidazolium counterions of different alkyl chain lengths, the spacings of lamellar LLC matrixes and position of dispersed complexes became tunable. The measured luminescent and rheological properties for such composite LLCs showed a dependence on the rigidity and isolation capability afforded by sterol molecules. It was also found that the increase of counterion alkyl chain length would weaken the LLC matrix's confinement and isolation effects and therefore exhibit the deteriorated luminescence performance. The enhanced luminescence efficiency and stability of doped BPS-n LLCs reflected the excellent segregation of europium complexes from each other and therefore the reduced self-quenching process. The obtained results here present the designability of LLC matrixes and their great potential to promote achieving the luminescence tunability of soft materials.
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Affiliation(s)
- Sijing Yi
- Key Laboratory of Colloid and Interface Chemistry, Shandong University , Ministry of Education, Jinan, 250100, China
| | - Jiao Wang
- Key Laboratory of Colloid and Interface Chemistry, Shandong University , Ministry of Education, Jinan, 250100, China
| | - Zhenyu Feng
- Key Laboratory of Colloid and Interface Chemistry, Shandong University , Ministry of Education, Jinan, 250100, China
| | - Xiao Chen
- Key Laboratory of Colloid and Interface Chemistry, Shandong University , Ministry of Education, Jinan, 250100, China
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6
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Li Q, Yao M, Yue X, Chen X. Effects of a Spacer on the Phase Behavior of Gemini Surfactants in Ethanolammonium Nitrate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4328-4336. [PMID: 28415837 DOI: 10.1021/acs.langmuir.7b00927] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The aggregation behavior of quaternary ammonium gemini surfactants (12-s-12) in a protic ionic liquid, ethanolammonium nitrate (EOAN), was investigated by small-angle X-ray scattering, freeze-fracture transmission electron microscopy, polarized optical microscopy, and rheological measurements. The rarely reported nonaqueous two phases in the ionic liquid were observed at lower 12-s-12 concentrations. The upper phase was composed of micelles, whereas only the surfactant unimers or multimers were detected in the low phase. At higher 12-s-12 concentrations, different aggregates were formed. The lamellar phase was observed in the 12-2-12/EOAN system, whereas the normal hexagonal phases in 12-s-12/EOAN (s = 3, 4, 5, 6, 8) systems and the micellar phase in the 12-10-12/EOAN system were observed. Such a dramatic phase transition induced by the spacer chain length was due to the unique solvent characteristics of EOAN compared to those of water and its counterpart ethylammonium nitrate.
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Affiliation(s)
- Qintang Li
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education , Jinan 250100, China
| | - Meihuan Yao
- School of Chemistry and Chemical Engineering, Henan Normal University , Xinxiang 453007, China
| | - Xiu Yue
- Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences , Urumqi 830011, China
| | - Xiao Chen
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education , Jinan 250100, China
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7
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Zhou L, Tian T, Xiao J, Wang T, Yu L. Aggregation behavior of pyrrolidinium-based surface active ionic liquids in H 2 O-EAN binary solvents. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.10.142] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Tian T, Qin J, Gao Y, Yu L. Experimental and DFT studies on aggregation behavior of dodecylsulfonate-based surface active ionic liquids in water and ethylammonium nitrate. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.02.074] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Yue X, Chen X, Li Q, Qian Z. Soft aggregates formed by a nonionic phytosterol ethoxylate and β-cyclodextrin in aqueous solution. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.03.062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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11
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Baruah A, Pathak AK, Ojha K. Study on the Thermal Stability of Viscoelastic Surfactant-Based Fluids Bearing Lamellar Structures. Ind Eng Chem Res 2015. [DOI: 10.1021/acs.iecr.5b01612] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Atrayee Baruah
- Department
of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - Akhilendra K. Pathak
- Department
of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
| | - Keka Ojha
- Department
of Petroleum Engineering, Indian School of Mines, Dhanbad, Jharkhand 826004, India
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12
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Misono T, Sekihara R, Endo T, Sakai K, Abe M, Sakai H. Ternary phase behavior of phytosterol ethoxylate, water, and imidazolium-based ionic liquid systems – Lyotropic liquid crystal formation over a wide range of compositions. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.01.083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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13
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Micelle formation of Tween 20 nonionic surfactant in imidazolium ionic liquids. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.02.008] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Yi S, Wang J, Chen X. Enhanced energy transfer efficiency and stability of europium β-diketonate complex in ionic liquid-based lyotropic liquid crystals. Phys Chem Chem Phys 2015; 17:20322-30. [PMID: 26190789 DOI: 10.1039/c5cp03659c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The self-assembly of luminescent lyotropic liquid crystals with europium β-diketonate complex confined within via hydrogen bonds between P123 and imidazolium cations is demonstrated.
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Affiliation(s)
- Sijing Yi
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Jiao Wang
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Xiao Chen
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
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15
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Qian Z, Yue X, Yi S, Li Q, Chen X. Unique lamellar lyotropic liquid crystal phases of nonionic phytosterol ethoxylates in glycerol. RSC Adv 2015. [DOI: 10.1039/c5ra21446g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
As one type of biocompatible surfactant, phytosterol ethoxylates (BPS-n, n is the oxyethylene chain length) have attracted more and more attention for their characteristic molecular structure.
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Affiliation(s)
- Zhaohong Qian
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Xiu Yue
- Laboratory of Environmental Sciences and Technology
- Xinjiang Technical Institute of Physics & Chemistry
- Key Laboratory of Functional Materials and Devices for Special Environments
- Chinese Academy of Sciences
- Urumqi
| | - Sijing Yi
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Qintang Li
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
| | - Xiao Chen
- Key Laboratory of Colloid and Interface Chemistry
- Shandong University
- Ministry of Education
- Jinan
- China
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16
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Jiang HJ, FitzGerald PA, Dolan A, Atkin R, Warr GG. Amphiphilic Self-Assembly of Alkanols in Protic Ionic Liquids. J Phys Chem B 2014; 118:9983-90. [DOI: 10.1021/jp504998t] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Haihui Joy Jiang
- School
of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Paul A. FitzGerald
- School
of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Andrew Dolan
- School
of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- Centre
for Advanced Particle Processing and Transport, Chemistry Building, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Gregory G. Warr
- School
of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
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17
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Cheng N, Hu Q, Bi Y, Xu W, Gong Y, Yu L. Gels and lyotropic liquid crystals: using an imidazolium-based catanionic surfactant in binary solvents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9076-9084. [PMID: 25025546 DOI: 10.1021/la502024a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The self-assembly behavior of an imidazolium-based catanionic surfactant, 1-butyl-3-methylimidazolium dodecylsulfate ([C4mim][C12H25SO4]), was investigated in water-ethylammonium nitrate (EAN) mixed solvents with different volume ratios. It is particular interesting that this simple surfactant could not only form lyotropic liquid crystals (LLC) with multimesophases, i.e., normal hexagonal (H1), lamellar liquid crystal (Lα), and reverse bicontinuous cubic phase (V2), in the water-rich environment but also act as an efficient low-molecular-weight gelator (LMWG) which gelated EAN-abundant binary media in a broad concentration range. The peculiar nanodisk cluster morphology of gels composed of similar bilayer units was first observed. FT-IR spectra and density functional theory (DFT) calculations reveal that strong H bonding and electrostatic interactions between EAN and the headgroups of [C4mim][C12H25SO4] are primarily responsible for gelation. The self-assembled gels displayed excellent mechanical strength and a thermoreversible sol-gel transition. It is for the first time that a rich variety of controllable ordered aggregates could be observed only by simply modulating the concentration of a single imidazolium-based catanionic surfactant or the ratio of mixed solvents. This environmentally friendly system is expected to have broad applications in various fields, such as materials science, drug delivery systems, and supramolecular chemistry.
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Affiliation(s)
- Ni Cheng
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education , Jinan 250100, PR China
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18
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Li Q, Wang X, Yue X, Chen X. Phase transition of a quaternary ammonium Gemini surfactant induced by minor structural changes of protic ionic liquids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1522-1530. [PMID: 24455981 DOI: 10.1021/la404826k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The aggregation behaviors of a Gemini surfactant [C12H25(CH3)2N(+)(CH2)2N(+)(CH3)2C12H25]Br2(-) (12-2-12) in two protic ionic liquids (PILs), propylammonium nitrate (PAN) and butylammonium nitrate (BAN), were investigated by means of several experimental techniques including small and wide-angle X-ray scattering, the polarized optical microscopy and the rheological measurement. Compared to those in ethylammonium nitrate (EAN), the minor structural changes with only one or two methylene units (-CH2-) increase in cationic chain length of PIL, result in a dramatic phase transition of formed aggregates. The critical micellization concentration was increased in PAN, while no micelle formation was detected in BAN. A normal hexagonal phase was observed in the 12-2-12/PAN system, while the normal hexagonal, bicontinuous cubic, and lamellar phases were mapped in the 12-2-12/BAN system. Such aggregation behavior changes can be ascribed to the weaker solvophobic interactions of 12-2-12 in PAN and BAN. The unique molecular structure of 12-2-12 is also an important factor to highlight such a dramatic phase transition due to the PIL structure change.
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Affiliation(s)
- Qintang Li
- Key Laboratory of Colloid and Interface Chemistry, Shandong University Ministry of Education , Jinan, 250100, China
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19
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Sharma SC, Atkin R, Warr GG. The Effect of Ionic Liquid Hydrophobicity and Solvent Miscibility on Pluronic Amphiphile Self-Assembly. J Phys Chem B 2013; 117:14568-75. [DOI: 10.1021/jp4086443] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Rob Atkin
- Centre
for Advanced Particle Processing and Transport, Chemistry Building, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Gregory G. Warr
- School
of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
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20
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Yue X, Chen X, Li Q, Li Z. Lyotropic liquid crystalline phases of a phytosterol ethoxylate in amide solvents. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11013-11021. [PMID: 23968535 DOI: 10.1021/la4024162] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Materials exhibiting unique aggregation behavior in nonaqueous solvents have attracted attention due to their wide applications. Motivated by this recent interest, the aggregation properties of a phytosterol ethoxylate surfactant, BPS-10, in three organic amide compounds, formamide (FA), N-methylformamide (NMF), and N,N-dimethyl- formamide (DMF), have been studied. Polarized optical microscopy and small-angle X-ray scattering techniques were used to investigate the lyotropic liquid crystalline (LLC) phases formed in these binary systems. Herein, we discuss the relationship between subtle intermolecular interactions and the aggregation behavior of BPS-10. As good proton donors or acceptors to form hydrogen bonding, FA molecules allow BPS-10 to show a richer phase behavior. Compared with the systems formed in water and ionic liquids, the LLCs constructed in FA have higher thermal stability. In addition, two kinds of lamellar phases could coexist in a narrow region. With the methyl replacement in formamide, however, the ability to form hydrogen bonds is reduced and the solvent bulk phase structure becomes less ordered from FA to DMF. Consequently, the solvophobic interaction of BPS-10 becomes weaker, and the LLCs are more difficult to form. In addition, the extra strong interactions between the steroid rings of BPS-10 may provide enough driving force to produce the hexagonal phase (H1) directly in NMF and DMF without micelle formation, thereby creating a novel sequence (isotropic → H1 → Lα) of ordered phases with increasing surfactant concentration. The results discussed herein should prove to be a useful complement to the growing body of literature regarding steroid surfactant aggregation in polar organic solvents.
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Affiliation(s)
- Xiu Yue
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China
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21
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Greaves TL, Drummond CJ. Solvent nanostructure, the solvophobic effect and amphiphile self-assembly in ionic liquids. Chem Soc Rev 2013; 42:1096-120. [PMID: 23165291 DOI: 10.1039/c2cs35339c] [Citation(s) in RCA: 253] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The ability of ionic liquids (ILs) to support amphiphile self-assembly into a range of mesophase structures has been established as a widespread phenomenon. From the ILs evaluated as self-assembly media, the vast majority have supported some lyotropic liquid crystal phase formation. Many neat ionic liquids have been shown to segregate into polar and non-polar domains to form a nanostructured liquid. A very strong correlation between the nanostructure of the ionic liquid and its characteristics as an amphiphile self-assembly solvent has been found. In this review we discuss ionic liquids as amphiphile self-assembly media, and identify trends that can be used to distinguish which ionic liquids are likely to have good promotion properties as self-assembly media. In particular these trends focus on the nanostructure of neat ionic liquids, their solvent cohesive energy density, and the related solvophobic effect. We forecast that many more ILs will be identified as amphiphile self-assembly solvents in the future.
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Affiliation(s)
- Tamar L Greaves
- CSIRO Materials Science and Engineering, Bag 10, Clayton VIC 3169, Australia.
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22
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Yue X, Chen X, Li Q. Comparison of Aggregation Behaviors of a Phytosterol Ethoxylate Surfactant in Protic and Aprotic Ionic Liquids. J Phys Chem B 2012; 116:9439-44. [DOI: 10.1021/jp305230r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiu Yue
- Key Laboratory
of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China
| | - Xiao Chen
- Key Laboratory
of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China
| | - Qintang Li
- Key Laboratory
of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, China
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23
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Jia H, Gao X, Chen Z, Liu G, Zhang X, Yan H, Zhou H, Zheng L. The high yield synthesis and characterization of gold nanoparticles with superior stability and their catalytic activity. CrystEngComm 2012. [DOI: 10.1039/c2ce25840d] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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