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Allegritti E, Battista S, Maggi MA, Marconi C, Galantini L, Giansanti L. Novel liposomal formulations for protection and delivery of levodopa: Structure-properties correlation. Int J Pharm 2023; 643:123230. [PMID: 37454830 DOI: 10.1016/j.ijpharm.2023.123230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 07/11/2023] [Accepted: 07/13/2023] [Indexed: 07/18/2023]
Abstract
Liposomes are promising drug carriers for a wide range of central nervous system disorders, such as Parkinson's disease (PD), since they can protect active substances from degradation and could be administered intranasally, ensuring a direct access to the brain. Levodopa (LD), the drug commonly used to treat PD, spontaneously oxidizes in aqueous solutions and thus needs to be stabilized. Our investigation focuses on the preparation and the physico-chemical characterization of mixed liposomes to vehiculate LD and two natural substances (L-ascorbic acid and quercetin) that can prevent its oxidation and contribute to the treatment of Parkinson's disease. These co-loaded vesicles were prepared using a saturated phospholipid and structurally related cationic or analogue N-oxide surfactants and showed different properties, based on their composition. In particular, ex-vivo permeability tests using porcine nasal mucosa were performed, denoting that subtle variations of the lipids structure can significantly affect the delivery of LD to the target site.
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Affiliation(s)
- Elena Allegritti
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67010 Coppito, AQ, Italy
| | - Sara Battista
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67010 Coppito, AQ, Italy
| | - Maria Anna Maggi
- Hortus Novus, Via Campo Sportivo 2, Canistro, 67051 L'Aquila, Italy
| | - Claudia Marconi
- Dipartimento di Chimica, Università di Roma "Sapienza", Piazzale Aldo Moro 5, 00185 Roma, Italy
| | - Luciano Galantini
- Dipartimento di Chimica, Università di Roma "Sapienza", Piazzale Aldo Moro 5, 00185 Roma, Italy
| | - Luisa Giansanti
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67010 Coppito, AQ, Italy.
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2
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Vasilieva EA, Kuznetsova DA, Valeeva FG, Kuznetsov DM, Zakharova LY. Role of Polyanions and Surfactant Head Group in the Formation of Polymer-Colloid Nanocontainers. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1072. [PMID: 36985966 PMCID: PMC10056398 DOI: 10.3390/nano13061072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 03/04/2023] [Accepted: 03/14/2023] [Indexed: 06/18/2023]
Abstract
OBJECTIVES This study was aimed at the investigation of the supramolecular systems based on cationic surfactants bearing cyclic head groups (imidazolium and pyrrolidinium) and polyanions (polyacrylic acid (PAA) and human serum albumin (HSA)), and factors governing their structural behavior to create functional nanosystems with controlled properties. Research hypothesis. Mixed PE-surfactant complexes based on oppositely charged species are characterized by multifactor behavior strongly affected by the nature of both components. It was expected that the transition from a single surfactant solution to an admixture with PE might provide synergetic effects on structural characteristics and functional activity. To test this assumption, the concentration thresholds of aggregation, dimensional and charge characteristics, and solubilization capacity of amphiphiles in the presence of PEs have been determined by tensiometry, fluorescence and UV-visible spectroscopy, and dynamic and electrophoretic light scattering. RESULTS The formation of mixed surfactant-PAA aggregates with a hydrodynamic diameter of 100-180 nm has been shown. Polyanion additives led to a decrease in the critical micelle concentration of surfactants by two orders of magnitude (from 1 mM to 0.01 mM). A gradual increase in the zeta potential of HAS-surfactant systems from negative to positive value indicates that the electrostatic mechanism contributes to the binding of components. Additionally, 3D and conventional fluorescence spectroscopy showed that imidazolium surfactant had little effect on HSA conformation, and component binding occurs due to hydrogen bonding and Van der Waals interactions through the tryptophan amino acid residue of the protein. Surfactant-polyanion nanostructures improve the solubility of lipophilic medicines such as Warfarin, Amphotericin B, and Meloxicam. PERSPECTIVES Surfactant-PE composition demonstrated beneficial solubilization activity and can be recommended for the construction of nanocontainers for hydrophobic drugs, with their efficacy tuned by the variation in surfactant head group and the nature of polyanions.
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3
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Kaur R, Kumar H, Kumar B, Singla M, Kumar V, Ghfar AA, Pandey S. Effect of amino acid on the surface adsorption and micellar properties of surface active ILs varying in cationic head groups. Heliyon 2022; 8:e10363. [PMID: 36082336 PMCID: PMC9445298 DOI: 10.1016/j.heliyon.2022.e10363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/19/2022] [Accepted: 08/15/2022] [Indexed: 11/25/2022] Open
Abstract
The interfacial along with bulk characteristics of the aqueous solutions of ILs with dissimilar cationic head group viz. 1-dodecyl-3-methylimidazolium bromide ([C12mim][Br]), and N-dodecyl-N-methylmorpholinium bromide ([Mor1,12][Br]) in the absence and the presence of an amino acid L-Methionine as an external additive have been examined by electrical conductivity, UV-Visible, surface tension, and DLS measurements. The CMC values, and the lowest maximum surface excess concentration (Гmax) achieved from all three techniques, and surface tension measurements respectively displayed more surface activity of the [C12mim][Br] than the [Mor1,12][Br]. Also, the morpholinium head group is less hazardous than imidazolium, it can be utilised to design ILs that are greener, mainly in combination with polar, small, and non-toxic side chains and anions.
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Battista S, Bellio P, Fagnani L, Allegritti E, Nazzicone L, Galantini L, Celenza G, Giansanti L. Structurally Related Liposomes Containing N-Oxide Surfactants: Physicochemical Properties and Evaluation of Antimicrobial Activity in Combination with Therapeutically Available Antibiotics. Mol Pharm 2022; 19:788-797. [PMID: 35170971 PMCID: PMC8905576 DOI: 10.1021/acs.molpharmaceut.1c00609] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
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Although liposomes
are largely investigated as drug delivery systems,
they can also exert a pharmacological activity if devoid of an active
principle as a function of their composition. Specifically, charged
liposomes can electrostatically interact with bacterial cells and,
in some cases, induce bacterial cell death. Moreover, they also show
a high affinity toward bacterial biofilms. We investigated the physicochemical
and antimicrobial properties of liposomes formulated with a natural
phospholipid and four synthetic l-prolinol-derived surfactants
at 9/1 and 8/2 molar ratios. The synthetic components differ in the
nature of the polar headgroup (quaternary ammonium salt or N-oxide) and/or the length of the alkyl chain (14 or 16
methylenes). These differences allowed us to investigate the effect
of the molecular structure of liposome components on the properties
of the aggregates and their ability to interact with bacterial cells.
The antimicrobial properties of the different formulations were assessed
against Gram-negative and Gram-positive bacteria and fungi. Drug–drug
interactions with four classes of available clinical antibiotics were
evaluated against Staphylococcus spp. The target
of each class of antibiotics plays a pivotal role in exerting a synergistic
effect. Our results highlight that the liposomal formulations with
an N-oxide moiety are required for the antibacterial
activity against Gram-positive bacteria. In particular, we observed
a synergism between oxacillin and liposomes containing 20 molar percentage
of N-oxide surfactants onStaphylococcus
haemolyticus, Staphylococcus epidermidis, andStaphylococcus aureus. In the
case of liposomes containing 20 molar percentage of the N-oxide surfactant with 14 carbon atoms in the alkyl chain for S. epidermidis, the minimum inhibitory concentration
was 0.125 μg/mL, well below the breakpoint value of the antibiotic.
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Affiliation(s)
- Sara Battista
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
| | - Pierangelo Bellio
- Dipartimento di Scienze Chimiche Applicate e Biotecnologie, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
| | - Lorenza Fagnani
- Dipartimento di Scienze Chimiche Applicate e Biotecnologie, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
| | - Elena Allegritti
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
| | - Lisaurora Nazzicone
- Dipartimento di Scienze Chimiche Applicate e Biotecnologie, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
| | - Luciano Galantini
- Dipartimento di Chimica, Università degli Studi di Roma "Sapienza", P.le A. Moro 5, 00185 Roma, Italy
| | - Giuseppe Celenza
- Dipartimento di Scienze Chimiche Applicate e Biotecnologie, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
| | - Luisa Giansanti
- Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio 10, 67010 Coppito, AQ, Italy
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5
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Monitoring the microenvironment inside polymeric micelles using the fluorescence probe 6-propionyl-2-dimethylaminonaphthalene (PRODAN). J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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6
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Kuznetsova DA, Kuznetsov DM, Vasileva LA, Toropchina AV, Belova DK, Amerhanova SK, Lyubina AP, Voloshina AD, Ya. Zakharova L. Pyrrolidinium surfactants with a biodegradable carbamate fragment: Self-assembling and biomedical application. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117229] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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7
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Cyclic and Acyclic Amine Oxide Alkyl Derivatives as Potential Adjuvants in Antimicrobial Chemotherapy against Methicillin-Resistant Staphylococcus aureus with an MDR Profile. Antibiotics (Basel) 2021; 10:antibiotics10080952. [PMID: 34439002 PMCID: PMC8388947 DOI: 10.3390/antibiotics10080952] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/03/2021] [Accepted: 08/05/2021] [Indexed: 11/16/2022] Open
Abstract
The dramatic intensification of antimicrobial resistance occurrence in pathogenic bacteria concerns the global community. The revitalisation of inactive antibiotics is, at present, the only way to go through this health system crisis and the use of antimicrobial adjuvants is turning out the most promising approach. Due to their low toxicity, eco-friendly characteristics and antimicrobial activity, amphoteric surfactants are good candidates. This study investigated the adjuvant potentialities of commercial acyclic and newly cyclic N-oxide surfactants combined with therapeutically available antibiotics against MDR methicillin-resistant Staphylococcus aureus (MRSA). The safety profile of the new cyclic compounds, compared to commercial surfactants, was preliminarily assessed, evaluating the cytotoxicity on human peripheral mononuclear blood cells and the haemolysis in human red blood cells. The compounds show an efficacious antimicrobial activity strongly related to the length of the carbon atom chain. In drug–drug interaction assays, all surfactants act synergistically, restoring sensitivity to oxacillin in MRSA, with dodecyl acyclic and cyclic derivatives being the most effective. After evaluating the cytotoxicity and considering the antimicrobial action, the most promising compound is the L-prolinol amine-oxide C12NOX. These findings suggest that the combination of antibiotics with amphoteric surfactants is a valuable therapeutic option for topical infections sustained by multidrug-resistant S. aureus.
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8
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Pal A, Punia R. Self-aggregation behaviour of cationic surfactant tetradecyltrimethylammonium bromide and bi-amphiphilic surface active ionic liquid 3-methyl-1-pentylimidazolium dodecylsulfate in aqueous solution. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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9
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Use of N-oxide and cationic surfactants to enhance antioxidant properties of (+)-usnic acid loaded liposomes. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124154] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Influence of structurally related micelle forming surfactants on the antioxidant activity of natural substances. Chem Phys Lipids 2019; 225:104818. [DOI: 10.1016/j.chemphyslip.2019.104818] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/22/2019] [Accepted: 09/04/2019] [Indexed: 11/23/2022]
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11
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Vasilieva EA, Lukashenko SS, Vasileva LA, Pavlov RV, Gaynanova GA, Zakharova LY. Aggregation behavior of the surfactant bearing pyrrolidinium head group in the presence of polyacrylic acid. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2390-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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The synthesis and properties of homologous series of surfactants containing the pyrrolidinium head group with hydroxyethyl moiety. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2213-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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13
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Self-Assembly Behaviors of Anionic–Cationic Binary Surfactant Systems in Poly(ethylene glycol) 200. J SURFACTANTS DETERG 2017. [DOI: 10.1007/s11743-017-2018-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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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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15
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Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide. J Fluoresc 2016; 26:1573-7. [PMID: 27324955 DOI: 10.1007/s10895-016-1841-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Accepted: 05/30/2016] [Indexed: 10/21/2022]
Abstract
We investigate the effect of cetyl-trimethyl-ammonium-bromides (CTAB) concentration on the fluorescence of Rhodamine-6G in water. This spectroscopic study of Rhodamine-6G in presence of CTAB was performed using two-photon-induced-fluorescence at 780 nm wavelength using high repetition rate femtosecond laser pulses. We report an increment of ∼10 % in the fluorescence in accordance with ∼12 % enhancement in the absorption intensity of the dye molecule around the critical micellar concentration. We discuss the possible mechanism for the enhancement in the two-photon fluorescence intensity and the importance of critical micellar concentration.
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16
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More U, Kumari P, Vaid Z, Behera K, Malek NI. Interaction Between Ionic Liquids and Gemini Surfactant: A Detailed Investigation into the Role of Ionic Liquids in Modifying Properties of Aqueous Gemini Surfactant. J SURFACTANTS DETERG 2015. [DOI: 10.1007/s11743-015-1747-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Wang T, Wang L, Jin Y, Chen P, Xu W, Yu L. Study the effect of substituent position in aromatic counterion to self-aggregation of cationic surface active ionic liquid in aqueous medium. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.01.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Xu W, Zhang Q, Wei H, Qin J, Yu L. Self-Aggregation of Catanionic Surface Active Ionic Liquids in Aqueous Solutions. J SURFACTANTS DETERG 2015. [DOI: 10.1007/s11743-014-1666-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Liang Y, Liang D, Hu Z, Cao D. Synthesis and Physicochemical Characterization of Chiral Pyrrolidinium-Based Surfactants. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2014.926252] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Zhao Y, Li X. Detecting the micellization of anionic surfactants by a colorimetric and fluorescent probe based on electrostatic attraction. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3209-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Pan A, Mati SS, Naskar B, Bhattacharya SC, Moulik SP. Self-Aggregation of MEGA-9 (N-Nonanoyl-N-methyl-d-glucamine) in Aqueous Medium: Physicochemistry of Interfacial and Solution Behaviors with Special Reference to Formation Energetics and Micelle Microenvironment. J Phys Chem B 2013; 117:7578-92. [DOI: 10.1021/jp400139d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Animesh Pan
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Soumya Sundar Mati
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Bappaditya Naskar
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | | | - Satya Priya Moulik
- Centre for Surface
Science, Department of Chemistry, Jadavpur University, Kolkata 700032, India
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22
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Bartoloni A, Bombelli C, Borocci S, Bonicelli MG, Galantini L, Giansanti L, Ierino M, Mancini G, Muschietti A, Sperduto C. Synthesis and physicochemical characterization of pyrrolidinium based surfactants. J Colloid Interface Sci 2013; 392:297-303. [DOI: 10.1016/j.jcis.2012.09.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 09/25/2012] [Accepted: 09/26/2012] [Indexed: 10/27/2022]
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23
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Lyotropic liquid crystalline phases with a series of N-alkyl-N-methylpiperidinium bromides and water. J Colloid Interface Sci 2013; 389:199-205. [DOI: 10.1016/j.jcis.2012.09.032] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Revised: 09/12/2012] [Accepted: 09/13/2012] [Indexed: 11/18/2022]
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24
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Pan A, Naskar B, Prameela GKS, Kumar BVNP, Mandal AB, Bhattacharya SC, Moulik SP. Amphiphile behavior in mixed solvent media I: self-aggregation and ion association of sodium dodecylsulfate in 1,4-dioxane-water and methanol-water media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13830-13843. [PMID: 22950843 DOI: 10.1021/la303281d] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Mixed aquo-organic solvents are used in chemical, industrial, and pharmaceutical processes along with amphiphilic materials. Their fundamental studies with reference to bulk and interfacial phenomena are thus considered to be important, but such detailed studies are limited. In this work, the interfacial adsorption of sodium dodecylsulfate (SDS, C12H25SO4(-)Na(+)) in dioxane-water (Dn-W) and methanol-water (Ml-W) media in extensive mixing ratios along with its bulk behavior have been investigated. The solvent-composition-dependent properties have been identified, and their quantifications have been attempted. The SDS micellization has been assessed in terms of different solvent parameters, and the possible formation of an ion pair and triple ion of the colloidal electrolyte, C12H25SO4(-)Na(+) in the Dn-W medium has been correlated and quantified. In the Ml-W medium at a high volume percent of Ml, the SDS amphiphile formed special associated species instead of ion association. The formation of self-assembly and the energetics of SDS in the mixed solvent media have been determined and assessed using conductometry, calorimetry, tensiometry, viscometry, NMR, and DLS methods. The detailed study undertaken herein with respect to the behavior of SDS in the mixed aquo-organic solvent media (Dn-W and Ml-W) is a new kind of endeavor.
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Affiliation(s)
- A Pan
- Centre for Surface Science, Department of Chemistry, Jadavpur University, Kolkata, India
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25
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Wang X, Yu L, Jiao J, Zhang H, Wang R, Chen H. Aggregation behavior of COOH-functionalized imidazolium-based surface active ionic liquids in aqueous solution. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.06.023] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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26
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Jiao J, Zhang H, Yu L, Wang X, Wang R. Dispersion of carbon nanotubes with the aid of surface-active ionic liquids 1-dodecyl-3-methyl-pyrrolidinium bromide. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.03.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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27
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Liu J, Zhang Q, Huo Y, Zhao M, Sun D, Wei X, Liu S, Zheng L. Interactions of two homologues of cationic surface active ionic liquids with sodium carboxymethylcellulose in aqueous solution. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2690-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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Zhao M, Yuan J, Zheng L. The formation of vesicles by N-dodecyl-N-methylpyrrolidinium bromide ionic liquid/copper dodecyl sulfate and application in the synthesis of leaflike CuO nanosheets. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2664-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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29
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Zhang S, Yan H, Zhao M, Zheng L. Aggregation behavior of gemini pyrrolidine-based ionic liquids 1,1′-(butane-1,4-diyl)bis(1-alkylpyrrolidinium) bromide ([Cnpy-4-Cnpy][Br2]) in aqueous solution. J Colloid Interface Sci 2012; 372:52-7. [DOI: 10.1016/j.jcis.2012.01.040] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 01/18/2012] [Accepted: 01/20/2012] [Indexed: 11/26/2022]
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30
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Rao VG, Ghatak C, Ghosh S, Mandal S, Sarkar N. The Chameleon-Like Nature of Zwitterionic Micelles: The Effect of Ionic Liquid Addition on the Properties of Aqueous Sulfobetaine Micelles. Chemphyschem 2012; 13:1893-901. [DOI: 10.1002/cphc.201100866] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Revised: 01/11/2012] [Indexed: 11/08/2022]
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31
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Salt-induced wormlike micelles formed by N-alkyl-N-methylpyrrolidinium bromide in aqueous solution. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.12.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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32
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Cai B, Li X, Yang Y, Dong J. Surface properties of Gemini surfactants with pyrrolidinium head groups. J Colloid Interface Sci 2011; 370:111-6. [PMID: 22261268 DOI: 10.1016/j.jcis.2011.12.025] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 12/06/2011] [Accepted: 12/09/2011] [Indexed: 11/30/2022]
Abstract
Gemini surfactants C(n)-4-(n)PB (where n represents the alkyl chain length of 10, 12, 14 and 16) were synthesized and characterized. Their surface activity, thermodynamic properties, and aggregation behavior were investigated by means of surface tension, electrical conductivity, and steady-state fluorescence. It was found that the Gemini surfactants C(n)-4-(n)PB have superior surface activity to their corresponding monomer surfactants C(n)MPB as expected. Additionally, these compounds have lower cmc and surface tension in comparison with conventional cationic Gemini surfactants m-4-m. Thermodynamic parameters (ΔG(m)(0),ΔH(m)(0),TΔS(m)(0)) show that the micellization is an entropy driven process with shorter hydrophobic chain lengths but instead is enthalpy driven for longer hydrophobic chain lengths. The effect of the hydrophobic alkyl chain length and the addition of inorganic salt NaBr on the surface activity and micellization are in line with the conventional cationic Gemini surfactants.
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Affiliation(s)
- Bo Cai
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, PR China
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Shi L, Zhao M, Zheng L. Micelle formation by N-alkyl-N-methylpyrrolidinium bromide in ethylammonium nitrate. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.09.064] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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34
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Liu J, Zhao M, Zhang Q, Sun D, Wei X, Zheng L. Interaction between two homologues of cationic surface active ionic liquids and the PEO-PPO-PEO triblock copolymers in aqueous solutions. Colloid Polym Sci 2011. [DOI: 10.1007/s00396-011-2492-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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35
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Rao VG, Ghatak C, Ghosh S, Pramanik R, Sarkar S, Mandal S, Sarkar N. Ionic Liquid-Induced Changes in Properties of Aqueous Cetyltrimethylammonium Bromide: A Comparative Study of Two Protic Ionic Liquids with Different Anions. J Phys Chem B 2011; 115:3828-37. [DOI: 10.1021/jp200233q] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Vishal Govind Rao
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Chiranjib Ghatak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Surajit Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Rajib Pramanik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Souravi Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Sarthak Mandal
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, WB, India
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36
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Gao L, Zhao L, Huang X, Xu B, Yan Y, Huang J. A surfactant type fluorescence probe for detecting micellar growth. J Colloid Interface Sci 2011; 354:256-60. [DOI: 10.1016/j.jcis.2010.10.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Revised: 10/13/2010] [Accepted: 10/14/2010] [Indexed: 11/25/2022]
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37
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Zhao M, Zheng L. Micelle formation by N-alkyl-N-methylpyrrolidinium bromide in aqueous solution. Phys Chem Chem Phys 2011; 13:1332-7. [DOI: 10.1039/c0cp00342e] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Karukstis KK, Litz JP, Garber MB, Angell LM, Korir GK. A spectral approach to determine location and orientation of azo dyes within surfactant aggregates. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 75:1354-61. [PMID: 20117043 DOI: 10.1016/j.saa.2009.12.087] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2009] [Revised: 12/31/2009] [Accepted: 12/31/2009] [Indexed: 05/10/2023]
Abstract
The UV-vis absorption properties of azo dyes are known to exhibit a variation with the polarity and acidity of the dye environment. The spectral properties of a series of anionic azo dyes were characterized to further probe the interaction of these dyes with two types of surfactant aggregates: (1) the spherical micelles formed in aqueous solution by alkyltrimethylammonium bromide (C(n)TAB) surfactants with n=10-16 and (2) the unilamellar vesicles spontaneously formed in water from binary mixtures of the oppositely-charged double-tailed surfactants cationic didodecyldimethylammonium bromide (DDAB) and anionic sodium dioctylsulfosuccinate (Aerosol OT or AOT). The observed dye spectra reflect the solvatochromic behavior of the dyes and suggest the location and orientation of the dye within the surfactant aggregates. Deconvolution of the overall spectra into sums of Gaussian curves more readily displays any contributions of tautomeric forms of the azo dyes resulting from intramolecular hydrogen bonding. The rich variation in UV/vis absorption properties of these anionic azo dyes supports their use as sensitive tools to explore the nanostructures of surfactant aggregates.
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Affiliation(s)
- Kerry K Karukstis
- Department of Chemistry, Harvey Mudd College, Claremont, CA 91711, USA.
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39
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Yuan C, Xu Y, Liao Y, Lin S, He N, Dai L. Morphology tailoring and temperature sensitivity control of waist cross-linked micelles and evaluation of their application as intelligent drug carriers. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm02023k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Getsis A, Mudring AV. Structural and Thermal Behaviour of the Pyrrolidinium Based Ionic Liquid Crystals [C10mpyr]Br and [C12mpyr]Br. Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200900216] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Structure changes in micelles and adsorbed layers during surfactant polymerization. J Colloid Interface Sci 2009; 336:449-54. [PMID: 19464021 DOI: 10.1016/j.jcis.2009.04.059] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2009] [Revised: 04/17/2009] [Accepted: 04/17/2009] [Indexed: 11/22/2022]
Abstract
We have studied the self-assembled structures formed by the cationic surfactant 11-(methacryloyloxy)undecyltrimethylammonium bromide (MUTAB) using small angle neutron scattering as it undergoes UV-initiated polymerization in bulk solution, and the subsequent adsorbed structures at the mica/solution interface using atomic force microscopy. MUTAB forms spheroidal aggregates in aqueous solution with an axial ratio of 2-3 both before and after polymerization, as previously reported in numerous studies. However, at intermediate conversions the micelles surprisingly form elongated structures up to 200 A long. Except for the unpolymerized MUTAB, which forms a featureless adsorbed layer, the micelle structures are largely retained after adsorption: structures are elongated at 50% conversion and globular at 100% conversion. These results demonstrate that the structure of the unpolymerized micelle is not simply kinetically-trapped during polymerization, but undergoes extensive reorganization as the reaction proceeds. This has implications for attempts to capture micellar structure by polymerization and use it to template nanostructured materials or for encapsulation.
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42
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Interaction between ionic liquid and zwitterionic surfactant: A comparative study of two ionic liquids with different anions. J Colloid Interface Sci 2009; 331:196-205. [DOI: 10.1016/j.jcis.2008.11.008] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2008] [Revised: 11/03/2008] [Accepted: 11/04/2008] [Indexed: 11/15/2022]
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Barnadas-Rodríguez R, Estelrich J. Photophysical Changes of Pyranine Induced by Surfactants: Evidence of Premicellar Aggregates. J Phys Chem B 2009; 113:1972-82. [DOI: 10.1021/jp806808u] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Ramon Barnadas-Rodríguez
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona, Avda. Joan XXIII s/n, 08028-Barcelona, Catalonia, Spain
| | - Joan Estelrich
- Departament de Fisicoquímica, Facultat de Farmàcia, Universitat de Barcelona, Avda. Joan XXIII s/n, 08028-Barcelona, Catalonia, Spain
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Behera K, Om H, Pandey S. Modifying Properties of Aqueous Cetyltrimethylammonium Bromide with External Additives: Ionic Liquid 1-Hexyl-3-methylimidazolium Bromide versus Cosurfactant n-Hexyltrimethylammonium Bromide. J Phys Chem B 2008; 113:786-93. [DOI: 10.1021/jp8089787] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kamalakanta Behera
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi - 110016, India
| | - Hari Om
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi - 110016, India
| | - Siddharth Pandey
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi - 110016, India
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45
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Qiu Y, Chen P, Liu M. Interfacial assembly of an achiral zinc phthalocyanine at the air/water interface: a surface pressure dependent aggregation and supramolecular chirality. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:7200-7207. [PMID: 18540684 DOI: 10.1021/la703703e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The aggregation and supramolecular chirality of the interfacial assemblies of an achiral phthalcyanine derivative, zinc 2,3,9,10,16,17,23,24-octakis(octyloxy)-29 H,31 H-phthaloxyanine (ZnPc), were investigated, and a surface pressure dependent behavior was observed. It was found that ZnPc could be spread as a Langmuir film on water surface and transferred onto solid substrates by the horizontal lifting method. The compound formed mixed J- and H-aggregates in the transferred Langmuir-Blodgett (LB) films. Deconvolution of the broaden Q-band revealed three main components of the spectra, which corresponded to H- and J-aggregates and medium transition aggregates, whose relative contents could be modulated by the surface pressure at which the films were transferred. On the other hand, the transferred LB films composed of these aggregates showed Cotton effects in circular dichroism spectra when the floating film was compressed over a certain surface pressure although the compound itself was achiral. The cooperative arrangement of the macrocylic ring in a helical manner through the interfacial organization was suggested to be responsible for such optical activity in the LB films. A possible explanation based on the cooperative arrangement of the ZnPc building blocks in a helical sense stacking in the aggregates was proposed.
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Affiliation(s)
- Yunfeng Qiu
- Beijing National Laboratory for Molecular Science, CAS Key Laboratory of Colloid, Interface and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, People's Republic of China
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Behera K, Pandey S. Ionic liquid induced changes in the properties of aqueous zwitterionic surfactant solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6462-6469. [PMID: 18512876 DOI: 10.1021/la800141p] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Modifying properties of aqueous surfactant solutions by addition of external additives is an important area of research. Unusual properties of ionic liquids (ILs) make them ideal candidates for this purpose. Changes in important physicochemical properties of aqueous zwitterionic N-dodecyl- N, N-dimethyl-3-ammonio-1-propanesulfonate (SB-12) surfactant solution upon addition of hydrophilic IL 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF 4], are reported. Dynamic light scattering results indicate a dramatic reduction in the average micellar size in the presence of [bmim][BF 4]; micellar (or micelle-like) aggregation in the presence of as high as 30 wt % [bmim][BF 4] is confirmed. Responses from fluorescence probes are used to obtain critical micelle concentration (cmc), aggregation number ( N agg), and dipolarity and microfluidity of the micellar pseudophase of aqueous SB-12 in the presence of [bmim][BF 4]. In general, increasing the amount of [bmim][BF 4] to 30 wt % results in decrease in N agg and increase in cmc. Increase in the dipolarity and the microfluidity of the probe cybotactic region within the micellar pseudophase is observed on increasing [bmim][BF 4] concentration in the solution. It is attributed to increased water penetration into the micellar pseudophase as [bmim][BF 4] is added to aqueous SB-12. It is proposed that IL [bmim][BF 4] behaves similar to an electrolyte and/or a cosurfactant when present at low concentrations and as a polar cosolvent when present at high concentrations. Electrostatic attraction between cation of IL and anion of zwitterion, and anion of IL and cation of zwitterion at low concentrations of [bmim][BF 4] is evoked to explain the observed changes. Presence of IL as cosolvent appears to reduce the efficiency of micellization process by reducing the hydrophobic effect.
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Affiliation(s)
- Kamalakanta Behera
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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47
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Silva OF, Fernández MA, Pennie SL, Gil RR, de Rossi RH. Synthesis and characterization of an amphiphilic cyclodextrin, a micelle with two recognition sites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3718-3726. [PMID: 18341360 DOI: 10.1021/la702962f] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A cyclodextrin derivative (Mod-CD) was synthesized through the monoesterification of beta-cyclodextrin (beta-CD) with 3-((E)-dec-2-enyl)-dihydrofuran-2,5-dione. The compound is an interesting surfactant that can form large aggregates not only through the interaction of the hydrophobic tails as in common amphiphilic compounds but also through the inclusion of the alkenyl chain into the cavity of another Mod-CD molecule. The self-inclusion of the chain in the cavity of cyclodextrin as well as the intermolecular inclusion was demonstrated by 1H NMR measurements that were able to detect methyl groups in three different environments. Besides, in the aggregates of Mod-CD, the cavity is available to interact with external guests such as phenolphthalein, 1-amino adamantane, and Prodan. Phenolphthalein has the same binding constant with Mod-CD and beta-CD, but the equilibrium constant for the interaction with Prodan is about 2 times larger for Mod-CD than for beta-CD. The latter result is attributed to the fact that this probe interacts with the micelle in two binding sites: the cavity of the cyclodextrin and the apolar heart of the micelle as evidenced by the spectrofluorimetric behavior of Prodan in solutions containing different concentrations of Mod-CD.
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Affiliation(s)
- O Fernando Silva
- Instituto de Investigaciones en Físico Química de Córdoba, Departamento de Química OrgAnica (INFIQC), Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba, Argentina
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48
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Behera K, Pandey S. Modulating properties of aqueous sodium dodecyl sulfate by adding hydrophobic ionic liquid. J Colloid Interface Sci 2007; 316:803-14. [PMID: 17719598 DOI: 10.1016/j.jcis.2007.07.072] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 07/27/2007] [Accepted: 07/27/2007] [Indexed: 11/28/2022]
Abstract
Altering and modifying important physicochemical properties of aqueous surfactant solutions is highly desirable as far as potential applications of such systems are concerned. Changes in the properties of aqueous solutions of a common anionic surfactant sodium dodecyl sulfate (SDS) are assessed in the presence of a common and popular 'hydrophobic' ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF(6)). Upon addition of up to approximately 0.10 wt% bmimPF(6), a dramatic decrease in critical micelle concentration (cmc) is accompanied by an increase in the degree of counterion dissociation (alpha) and micellar aggregation number (N(agg)) indicating micellar growth. However, in the range 0.10 wt% < or = bmimPF(6) 2.00 wt%, relatively gradual decrease in alpha and N(agg) is observed along with no change in cmc. Significantly decreased microfluidity of the aqueous SDS solutions on addition of bmimPF(6) is indicated by a fluorescence microviscosity probe 1,3-bis-(1-pyrenyl)propane which suggests partitioning of bmimPF(6) into the SDS micellar phase. Behavior of solvatochromic fluorescence probes, pyrene, pyrene-1-carboxaldehyde, and 2-(p-toluidino)naphthalene-6-sulfonate, confirms interaction, and possible complexation, between IL bmimPF(6) and anionic micellar surface. Increased solubility of bmimPF(6) with increasing SDS concentration further confirms SDS-bmimPF(6) interactions. Presence of strong electrostatic attraction between bmim(+) and anionic micellar surface is proposed to be the most dominant reason for these observations. All-in-all, unique role of a hydrophobic ionic liquid bmimPF(6) in modifying the properties of aqueous anionic sodium dodecyl sulfate is demonstrated.
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Affiliation(s)
- Kamalakanta Behera
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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Koutsantonis GA, Nealon GL, Buckley CE, Paskevicius M, Douce L, Harrowfield JM, McDowall AW. Wormlike micelles from a cage amine metallosurfactant. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:11986-11990. [PMID: 17949016 DOI: 10.1021/la701283b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We have shown that copper and cobalt metallosurfactants derived from Cu(II) and Co(III) complexes of a macrobicyclic hexamine ("cage") can form wormlike micelles in aqueous solution that may coexist with or easily interconvert with vesicle structures. The cylindrical micelle structures are unusual for triple-chain surfactants with a single headgroup and are not easily accounted for using geometrical packing arguments. The solution behavior has been characterized by cryo-TEM and SAXS measurements. Both the Cu and Co compounds display viscoelastic solutions at 1 wt %, indicating that such behavior may be anticipated for the full variety of stable metal complexes formed by the cage headgroup, auguring applications based on the incorporation of metallo aggregates into mesoporous silica structures.
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Affiliation(s)
- George A Koutsantonis
- Chemistry, School of Biomedical, Biomolecular and Chemical Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia 6009.
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50
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Behera K, Pandey MD, Porel M, Pandey S. Unique role of hydrophilic ionic liquid in modifying properties of aqueous Triton X-100. J Chem Phys 2007; 127:184501. [DOI: 10.1063/1.2785178] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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