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Hao W, Chesnokov YM, Molchanov VS, Podlesnyi PR, Kuklin AI, Skoi VV, Philippova OE. Cryo-electron tomography study of the evolution of wormlike micelles to saturated networks and perforated vesicles. J Colloid Interface Sci 2024; 672:431-445. [PMID: 38850868 DOI: 10.1016/j.jcis.2024.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2024] [Revised: 06/02/2024] [Accepted: 06/02/2024] [Indexed: 06/10/2024]
Abstract
HYPOTHESIS The formation of micellar aggregates and the changes in their morphology are crucial for numerous practical applications of surfactants. However, a proper structural characterization of complicated micellar nanostructures remains a challenge. This paper demonstrates the advances of cryo-electron tomography (cryo-ET) in revealing the structural characteristics that accompany the evolution of surfactant aggregates. EXPERIMENTS By using cryo-ET in combination with cryo-transmission electron microscopy (cryo-TEM), small-angle neutron scattering (SANS), and rheometry, studies were carried out on a model system composed of zwitterionic and nonionic surfactants. In this system, the molecular packing parameter was increased gradually by increasing the molar fraction of nonionic surfactant. FINDINGS A series of structural transformations was observed: linear wormlike micelles (WLMs) → branched WLMs → saturated network of multiconnected WLMs → perforated vesicles (stomatosomes). The transformations occur through an increase in the number of branches at the expense of cylindrical subchains and semispherical endcaps. Exponential distribution of subchains length was confirmed experimentally for multiconnected saturated networks. The stomatosomes were formed when the length of subchains becomes much shorter than the persistence length, causing the three-dimensional (3D) structure to transform into a two-dimensional (2D) membrane. This work identifies the mechanism of the structural changes, which can be further used to design various surfactant self-assemblies.
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Affiliation(s)
- Wuyi Hao
- Physics Department, Moscow State University, 119991 Moscow, Russia
| | - Yuri M Chesnokov
- National Research Center "Kurchatov Institute", 123182, Moscow, Russia
| | | | - Pavel R Podlesnyi
- National Research Center "Kurchatov Institute", 123182, Moscow, Russia
| | | | - Vadim V Skoi
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
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2
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Denk P, Matthews L, Prévost S, Zemb T, Kunz W. A dilute nematic gel produced by intramicellar segregation of two polyoxyethylene alkyl ether carboxylic acids. J Colloid Interface Sci 2024; 659:833-848. [PMID: 38218087 DOI: 10.1016/j.jcis.2024.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 12/28/2023] [Accepted: 01/03/2024] [Indexed: 01/15/2024]
Abstract
MOTIVATION Surfactants like C8E8CH2COOH have such bulky headgroups that they cannot show the common sphere-to-cylinder transition, while surfactants like C18:1E2CH2COOH are mimicking lipids and form only bilayers. Mixing these two types of surfactants allows one to investigate the competition between intramicellar segregation leading to disc-like bicelles and the temperature dependent curvature constraints imposed by the mismatch between heads and tails. EXPERIMENTS We establish phase diagrams as a function of temperature, surfactant mole ratio, and active matter content. We locate the isotropic liquid-isotropic liquid phase separation common to all nonionic surfactant systems, as well as nematic and lamellar phases. The stability and rheology of the nematic phase is investigated. Texture determination by polarizing microscopy allows us to distinguish between the different phases. Finally, SANS and SAXS give intermicellar distances as well as micellar sizes and shapes present for different compositions in the phase diagrams. FINDINGS In a defined mole ratio between the two components, intramicellar segregation wins and a viscoelastic discotic nematic phase is present at low temperature. Partial intramicellar mixing upon heating leads to disc growth and eventually to a pseudo-lamellar phase. Further heating leads to complete random mixing and an isotropic phase, showing the common liquid-liquid miscibility gap. This uncommon phase sequence, bicelles, lamellar phase, micelles, and water-poor packed micelles, is due to temperature induced mixing combined with dehydration of the headgroups. This general molecular mechanism explains also why a metastable water-poor lamellar phase quenched by cooling can be easily and reproducibly transformed into a nematic phase by gentle hand shaking at room temperature, as well as the entrapment of air bubbles of any size without encapsulation by bilayers or polymers.
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Affiliation(s)
- Patrick Denk
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93053 Regensburg, Germany
| | - Lauren Matthews
- ESRF - The European Synchrotron, 71 avenue des Martyrs, F-38043 Grenoble, France
| | - Sylvain Prévost
- ESRF - The European Synchrotron, 71 avenue des Martyrs, F-38043 Grenoble, France; Institut Laue-Langevin - The European Neutron Source, 71 avenue des Martyrs, F-38042 Grenoble, France
| | - Thomas Zemb
- Institut de Chimie Séparative de Marcoule, BP 17171, F-30207 Bagnols sur Cèze, France
| | - Werner Kunz
- Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93053 Regensburg, Germany.
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Forooqi Motlaq V, Gedda L, Edwards K, Doutch J, Bergström LM. Spontaneous Formation of Ultrasmall Unilamellar Vesicles in Mixtures of an Amphiphilic Drug and a Phospholipid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11337-11344. [PMID: 37530182 PMCID: PMC10433524 DOI: 10.1021/acs.langmuir.3c01023] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 07/12/2023] [Indexed: 08/03/2023]
Abstract
We have observed ultrasmall unilamellar vesicles, with diameters of less than 20 nm, in mixtures of the tricyclic antidepressant drug amitriptyline hydrochloride (AMT) and the unsaturated zwitterionic phospholipid 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) in physiological saline solution. The size and shape of spontaneously formed self-assembled aggregates have been characterized using complementary techniques, i.e., small-angle neutron and X-ray scattering (SANS and SAXS) and cryo-transmission electron microscopy (cryo-TEM). We observe rodlike mixed micelles in more concentrated samples that grow considerably in length upon dilution, and a transition from micelles to vesicles is observed as the concentration approaches the critical micelle concentration of AMT. Unlike the micelles, the spontaneously formed vesicles decrease in size with each step of dilution, and ultrasmall unilamellar vesicles, with diameters as small as about 15 nm, were observed at the lowest concentrations. The spontaneously formed ultrasmall unilamellar vesicles maintain their size for as long we have investigated them (i.e., several months). To the best of our knowledge, such small vesicles have never before been reported to form spontaneously in a biocompatible phospholipid-based system. Most interestingly, the size of the vesicles was observed to be strongly dependent on the chemical structure of the phospholipid, and in mixtures of AMT and the phospholipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), the vesicles were observed to be considerably larger in size. The self-assembly behavior in the phospholipid-drug surfactant system in many ways resembles the formation of equilibrium micelles and vesicles in mixed anionic/cationic surfactant systems.
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Affiliation(s)
- Vahid Forooqi Motlaq
- Department
of Medicinal Chemistry, Uppsala University, P.O. Box 547, 751 23 Uppsala, Sweden
| | - Lars Gedda
- Department
of Chemistry—Ångström, P.O. Box 573, Uppsala University, 751
23 Uppsala, Sweden
| | - Katarina Edwards
- Department
of Chemistry—Ångström, P.O. Box 573, Uppsala University, 751
23 Uppsala, Sweden
| | - James Doutch
- ISIS
Neutron and Muon Source, STFC, Rutherford
Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, Oxon, United Kingdom
| | - L. Magnus Bergström
- Department
of Medicinal Chemistry, Uppsala University, P.O. Box 547, 751 23 Uppsala, Sweden
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Forooqi Motlaq V, Ortega-Holmberg M, Edwards K, Gedda L, Lyngsø J, Pedersen JS, Bergström LM. Investigation of the enhanced ability of bile salt surfactants to solubilize phospholipid bilayers and form mixed micelles. SOFT MATTER 2021; 17:7769-7780. [PMID: 34351343 DOI: 10.1039/d1sm00745a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The self-assembly in mixtures of the anionic bile salt surfactant sodium deoxycholate (NaDC) and the zwitterionic phospholipid 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) in physiological saline solution has been investigated using light scattering, small-angle X-ray scattering and cryo-transmission electron microscopy. Rather small tri-axial ellipsoidal NaDC-DMPC mixed micelles form at a high content of bile salt in the mixture, which increase in size as an increasing amount of DMPC is incorporated into the micelles. Eventually, the micelles begin to grow substantially in length to form long wormlike micelles. At higher mole fractions of DMPC, the samples become turbid and cryo-TEM measurements reveal the existence of large perforated vesicles (stomatosomes), coexisting with geometrically open disks. To our knowledge, stomatosomes have not been observed before for any bile salt-phospholipid system. Mixed micelles are found to be the sole aggregate structure in a very wide regime of bile salt-phospholipid compositions, i.e. up to about 77 mol% phospholipid in the micelles. This is much higher than the corresponding value of 25 mol% observed for the conventional surfactant hexadecyltrimethylammonium bromide (CTAB) mixed with DMPC in the same solvent. The enhanced ability of bile salt surfactants to solubilize phospholipid bilayers and form mixed micelles is rationalized using bending elasticity theory. From our theoretical analysis, we are able to conclude that amphiphilic molecules rank in the following order of increasing spontaneous curvature: phospholipids < conventional surfactants < bile salts. The bending rigidity of the different amphiphilic molecules increases according to the following sequence: bile salts < conventional surfactants < phospholipids.
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Affiliation(s)
- Vahid Forooqi Motlaq
- Department of Medicinal Chemistry, Pharmaceutical Physical Chemistry, Uppsala University, SE-751 23 Uppsala, Sweden.
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5
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Wu H, Xu F, Gao G, Feng X. Highly Ordered Interconnected 1 nm Pores in Polymers Fabricated from Easily Accessible Gyroid Liquid Crystals. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00721] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hanyu Wu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Sciences and Engineering, Donghua University, Shanghai 201620, China
| | - Fengxian Xu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
- College of Materials Sciences and Engineering, Donghua University, Shanghai 201620, China
| | - Guanzhen Gao
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Xunda Feng
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, Donghua University, Shanghai 201620, China
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Emelyanova KA, Sorina PO, Victorov AI. Transmembrane potential in vesicles formed by catanionic surfactant mixtures in an aqueous salt solution. Phys Chem Chem Phys 2020; 22:26438-26451. [PMID: 33180892 DOI: 10.1039/d0cp05248e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The transmembrane potential plays a key role in a multitude of natural and synthetic systems because it is the driving force for the flow of mobile charged species across the membranes. We develop a molecular thermodynamic theory to study the transmembrane potential of metastable and equilibrium vesicles as a function of the vesicle structural parameters, and salinity and acidity of the surrounding aqueous solution. We show that addition of salt to the external solution may reverse the sign of the transmembrane potential, indicating the reversal of sign of the net charges accumulated in the vesicle interior and exterior. We discuss maxima/minima of the transmembrane potential as a function of added salt and propose a simple formula to estimate the location of these extrema. We demonstrate that a vesicle brought to equilibrium with an acidic environment may take up and hold alkaline solution in its interior. We also show that bending of a symmetrically charged planar membrane leads to a buildup of the transmembrane potential. The catanionic vesicles considered in this work are composed of a series of classical surfactants and model surfactants differing in their molecular structure. These vesicles may serve as a simple prototype for capsules formed by the amphiphilic membranes of a more complex structure, e.g., in nanoreactors or drug-delivery systems.
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Affiliation(s)
- Ksenia A Emelyanova
- St. Petersburg State University, 7/9 Universitetskaya Nab., 199034 St. Petersburg, Russia.
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Bryant SJ, Atkin R, Gradzielski M, Warr GG. Catanionic Surfactant Self-Assembly in Protic Ionic Liquids. J Phys Chem Lett 2020; 11:5926-5931. [PMID: 32628489 DOI: 10.1021/acs.jpclett.0c01608] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mixing of cationic and anionic surfactants in water can result in pseudo-double-tailed catanionic surfactant ion pairs that form lamellar phases or vesicles that are unstable toward electrolyte addition. Here we show that despite the very high ionic strengths, catanionic surfactants counterintuitively form a wider variety of self-assembled aggregates in pure ionic liquids (ILs, pure salts in a liquid phase) than in water, including micelles, vesicles, and lyotropic phases. Self-assembled structures only form when the IL is sufficiently polar to drive self-assembly through electrostatic interactions and/or H-bond networks, but the catanionic effect is manifested only when the IL does not itself exhibit pronounced amphiphilic nanostructure. This enables the type of catanionic aggregate formed to be designed by changing the hydrogen bonds between the ions through variation of the structures of the cation and anion. These results reveal an entirely new way of controlling catanionic surfactant self-assembly under nonaqueous and high-salt conditions.
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Affiliation(s)
- Saffron J Bryant
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, University of Western Australia, Crawley, WA 6009, Australia
| | - Michael Gradzielski
- Institute for Chemistry, Technische Universität Berlin, Strasse des 17 Juni 124, D-10623 Berlin, Germany
| | - Gregory G Warr
- School of Chemistry and Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
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8
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Warr GG, Atkin R. Solvophobicity and amphiphilic self-assembly in neoteric and nanostructured solvents. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2019.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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9
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Catanionic and chain-packing effects on surfactant self-assembly in the ionic liquid ethylammonium nitrate. J Colloid Interface Sci 2019; 540:515-523. [DOI: 10.1016/j.jcis.2019.01.048] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/11/2019] [Accepted: 01/11/2019] [Indexed: 11/19/2022]
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10
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Kundu N, Banik D, Sarkar N. Self-Assembly of Amphiphiles into Vesicles and Fibrils: Investigation of Structure and Dynamics Using Spectroscopy and Microscopy Techniques. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:11637-11654. [PMID: 29544249 DOI: 10.1021/acs.langmuir.7b04355] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Amphiphiles are a class of molecules which are known to assemble into a variety of nanostructures. The understanding and applications of self-assembled systems are based on what has been learned from biology. Among the vast number of self-assemblies, in this article, we have described the formation, characterization, and dynamics of two important biologically inspired assemblies: vesicles and fibrils. Vesicles, which can be classified into several categories depending on the sizes and components, are of great interest due to their potential applications in drug delivery and as nanoscale reactors. The structure and dynamics of vesicles can also mimic the complex geometry of the cell membrane. On the other hand, the self-assembly of proteins, peptides, and even single amino acids leads to a number of degenerative disorders. Thus, a complete understanding of these self-assembled systems is necessary. In this article, we discuss recent work on vesicular aggregates composed of phospholipids, fatty acids, and ionic as well as nonionic surfactants and single amino acid-based fibrils such as phenylalanine and tyrosine. Beside the characterization, we also emphasize the excited-state dynamics inside the aggregates for a proper understanding of the organization, reactivity, and heterogeneity of the aggregates.
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Affiliation(s)
- Niloy Kundu
- Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , WB India
| | - Debasis Banik
- 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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11
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Berlepsch HV, Thota BNS, Wyszogrodzka M, de Carlo S, Haag R, Böttcher C. Controlled self-assembly of stomatosomes by use of single-component fluorinated dendritic amphiphiles. SOFT MATTER 2018; 14:5256-5269. [PMID: 29888366 DOI: 10.1039/c8sm00243f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A series of novel non-ionic amphiphiles with dendritic oligoglycerol head groups of different generations ([G1]-[G3]) and lipophilic/fluorophilic tail segments, comprising single or double tail alkyl chains, C8F17-perfluoro rod segments as well as flexible spacer groups of different lengths were designed and synthesized. We expected that the differences in the size of the dendritic head groups in combination with perfluorinated segments would have an impact on the supramolecular structures formed in aqueous solution if compared with the hydrogenated analogues. Investigating the self-assembly behavior mainly by cryogenic transmission electron microscopy (cryo-TEM) and cryo-electron tomography (cryo-ET) we found as a new result the formation of perforated bilayer vesicles (stomatosomes) and bicontinuous network structures. Surprisingly, we have observed stomatosome formation by self-assembly of single component fluorinated dendritic amphiphiles. These assembly structures turned out to be extremely robust against harsh conditions, although there are strong indications that they represent non-equilibrium structures, which eventually transform into a bicontinuous cubic network structure of double diamond symmetry. In general, the molecular asymmetry of amphiphiles tuned by chemical design induced the expected trend from spherical micelles through worm-like micelles to perforated bilayers and three-dimensional network structures.
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Affiliation(s)
- H V Berlepsch
- Forschungszentrum für Elektronenmikroskopie, Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße 36a, 14195 Berlin, Germany.
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12
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Emelyanova KA, Victorov AI. Molecular thermodynamic modeling of a bilayer perforation in mixed catanionic surfactant systems. Phys Chem Chem Phys 2018; 20:27924-27929. [DOI: 10.1039/c8cp04593c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An interplay between electrostatics and deformation of surfactant tails is responsible for the spontaneous formation of pores in self-assembled bilayers.
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13
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Emelyanova KA, Victorov AI. Driving Force for Spontaneous Perforation of Bilayers Formed by Ionic Amphiphiles in Aqueous Salt. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13438-13443. [PMID: 29064715 DOI: 10.1021/acs.langmuir.7b02885] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Spontaneous perforation of amphiphilic membranes is important in both living matter and technology because of an impact on functions of biological membranes and shape transitions of self-assembling structures. Nevertheless, no definite molecular mechanism has been established so far even for simple ionic surfactant systems. We show that spontaneous perforation of a bilayer formed by an ionic amphiphile is driven by electrostatics. Creation of large pores with a concave-convex geometry of the rim is promoted by lower electrostatic free energy than that for a flat nonperforated bilayer. The opposite effect comes from the elasticity of the hydrocarbon tails of the amphiphile that prefer flat geometry of a nonperforated bilayer. The balance between electrostatics and tail deformation controls the appearance of pores; this balance is modulated by added salt that screens the electrostatic interactions. We illustrate the proposed mechanism with the aid of classical aggregation model that has been extended by including an analytical description of the electrostatic contribution for the toroidal rim of a pore. Numerical solution of the linearized Poisson-Boltzmann equation confirms the role of electrostatic forces in formation of pores. For the ionic surfactants of CnTAB family, we predict shape transitions including bilayer perforations and formation of branched micellar networks induced by changing salinity or temperature and demonstrate the effect of surfactant's molecular parameters on these transitions.
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Affiliation(s)
- Ksenia A Emelyanova
- St. Petersburg State University , 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia
| | - Alexey I Victorov
- St. Petersburg State University , 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia
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14
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Dhawan VV, Nagarsenker MS. Catanionic systems in nanotherapeutics – Biophysical aspects and novel trends in drug delivery applications. J Control Release 2017; 266:331-345. [DOI: 10.1016/j.jconrel.2017.09.040] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2017] [Accepted: 09/28/2017] [Indexed: 01/10/2023]
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15
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Choi H, Kim JJ, Mo YH, Reddy BM, Park SE. Novelty of Dynamic Process in the Synthesis of Biocompatible Silica Nanotubes by Biomimetic Glycyldodecylamide as a Soft Template. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10707-10714. [PMID: 28920442 DOI: 10.1021/acs.langmuir.7b02881] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A dynamic process in the synthesis of silica nanotubes (SNTs) by utilizing glycyldodecylamide (GDA) as a soft template was thoroughly investigated. The morphological evolution from GDA to SNTs was deeply explored to elucidate the formation mechanism for optimizing the synthesis procedure. Various analytical tools, namely, XRD, FTIR, SEM, TEM, Z-potential, and N2 adsorption/desorption isotherms, were employed during the synthesis procedure. The interactive structure of GDA was also investigated using TEM-EDX as a function of aging time. These studies revealed the stepwise morphology of nanograin, nanofiber, curved plate, and nanotube in the ethanol/water solution when aged at room temperature. The supramolecular GDA molded the vesicle type nanostructure which was surrounded by silica and facilitated the formation of uniform SNTs. The stimulus for GDA to be curved into a vesicle was the intermolecular hydrogen bonding between adjacent amide groups of the template molecules. This was illustrated by FTIR spectra of GDA-silica intermediate by detecting the transition of amide I peak from 1678 to 1635 cm-1. The effect of hydrogen bonding became stronger when the sample was aged.
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Affiliation(s)
- Hyejung Choi
- Laboratory of Nano-Green Catalysis & Nano-center for Fine Chemicals Fusion Technology, Department of Chemistry, Inha University , Incheon 402-751, Republic of Korea
| | - Joong-Jo Kim
- Laboratory of Nano-Green Catalysis & Nano-center for Fine Chemicals Fusion Technology, Department of Chemistry, Inha University , Incheon 402-751, Republic of Korea
| | - Yong-Hwan Mo
- Laboratory of Nano-Green Catalysis & Nano-center for Fine Chemicals Fusion Technology, Department of Chemistry, Inha University , Incheon 402-751, Republic of Korea
| | - Benjaram M Reddy
- Laboratory of Nano-Green Catalysis & Nano-center for Fine Chemicals Fusion Technology, Department of Chemistry, Inha University , Incheon 402-751, Republic of Korea
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology , Uppal Road, Hyderabad-500 007, India
| | - Sang-Eon Park
- Laboratory of Nano-Green Catalysis & Nano-center for Fine Chemicals Fusion Technology, Department of Chemistry, Inha University , Incheon 402-751, Republic of Korea
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16
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Dutta R, Ghosh S, Banerjee P, Kundu S, Sarkar N. Micelle-vesicle-micelle transition in aqueous solution of anionic surfactant and cationic imidazolium surfactants: Alteration of the location of different fluorophores. J Colloid Interface Sci 2017; 490:762-773. [DOI: 10.1016/j.jcis.2016.12.009] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 12/05/2016] [Accepted: 12/05/2016] [Indexed: 01/14/2023]
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17
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Dao TPT, Brûlet A, Fernandes F, Er-Rafik M, Ferji K, Schweins R, Chapel JP, Fedorov A, Schmutz M, Prieto M, Sandre O, Le Meins JF. Mixing Block Copolymers with Phospholipids at the Nanoscale: From Hybrid Polymer/Lipid Wormlike Micelles to Vesicles Presenting Lipid Nanodomains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1705-1715. [PMID: 28128560 DOI: 10.1021/acs.langmuir.6b04478] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Hybrids, i.e., intimately mixed polymer/phospholipid vesicles, can potentially marry in a single membrane the best characteristics of the two separate components. The ability of amphiphilic copolymers and phospholipids to self-assemble into hybrid membranes has been studied until now on the submicrometer scale using optical microscopy on giant hybrid unilamellar vesicles (GHUVs), but limited information is available on large hybrid unilamellar vesicles (LHUVs). In this work, copolymers based on poly(dimethylsiloxane) and poly(ethylene oxide) with different molar masses and architectures (graft, triblock) were associated with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). Classical protocols of LUV formation were used to obtain nanosized self-assembled structures. Using small-angle neutron scattering (SANS), time-resolved Förster resonance energy transfer (TR-FRET), and cryo-transmission electron microscopy (cryo-TEM), we show that copolymer architecture and molar mass have direct influences on the formation of hybrid nanostructures that can range from wormlike hybrid micelles to hybrid vesicles presenting small lipid nanodomains.
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Affiliation(s)
- T P Tuyen Dao
- University of Bordeaux , LCPO UMR 5629, 16 Avenue Pey Berland, F-33600 Pessac, France
- CNRS , Laboratoire de Chimie des Polymères Organiques, UMR 5629, F-33600, Pessac, France
- Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Universidade de Lisboa Instituto Superior Técnico , 1049-001 Lisboa, Portugal
| | - A Brûlet
- Laboratoire Léon Brillouin, UMR12 CEA-CNRS, CEA Saclay , F-91191 Gif-sur-Yvette Cedex, France
| | - F Fernandes
- Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Universidade de Lisboa Instituto Superior Técnico , 1049-001 Lisboa, Portugal
- Research Unit on Applied Molecular Biosciences-Rede de Química e Tecnologia (UCIBIO-REQUIMTE), Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa , Caparica, Portugal
| | - M Er-Rafik
- Institut Charles Sadron, UPR 22 CNRS, Université de Strasbourg , 23 rue du Loess, 67034 Strasbourg, France
| | - K Ferji
- University of Bordeaux , LCPO UMR 5629, 16 Avenue Pey Berland, F-33600 Pessac, France
- CNRS , Laboratoire de Chimie des Polymères Organiques, UMR 5629, F-33600, Pessac, France
| | - R Schweins
- ILL Grenoble, DS LSS, CS20156, 71 Avenue Martyrs, F-38042 Grenoble 9, France
| | - J-P Chapel
- Université de Bordeaux, CNRS , Ctr Rech Paul Pascal CRPP, UPR 8641, F-33600 Pessac, France
| | - A Fedorov
- Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Universidade de Lisboa Instituto Superior Técnico , 1049-001 Lisboa, Portugal
| | - M Schmutz
- Institut Charles Sadron, UPR 22 CNRS, Université de Strasbourg , 23 rue du Loess, 67034 Strasbourg, France
| | - M Prieto
- Centro de Química-Física Molecular and Institute of Nanoscience and Nanotechnology, Universidade de Lisboa Instituto Superior Técnico , 1049-001 Lisboa, Portugal
| | - O Sandre
- University of Bordeaux , LCPO UMR 5629, 16 Avenue Pey Berland, F-33600 Pessac, France
- CNRS , Laboratoire de Chimie des Polymères Organiques, UMR 5629, F-33600, Pessac, France
| | - J-F Le Meins
- University of Bordeaux , LCPO UMR 5629, 16 Avenue Pey Berland, F-33600 Pessac, France
- CNRS , Laboratoire de Chimie des Polymères Organiques, UMR 5629, F-33600, Pessac, France
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18
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Bhattarai R, Sutradhar T, Roy B, Guha P, Chettri P, Mandal AK, Bykov AG, Akentiev AV, Noskov BA, Panda AK. Double-Tailed Cystine Derivatives as Novel Substitutes of Phospholipids with Special Reference to Liposomes. J Phys Chem B 2016; 120:10744-10756. [PMID: 27659807 DOI: 10.1021/acs.jpcb.6b06413] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ravi Bhattarai
- Department
of Chemistry, University of North Bengal, Darjeeling 734013, West Bengal, India
| | - Tanushree Sutradhar
- Department
of Chemistry, University of North Bengal, Darjeeling 734013, West Bengal, India
| | - Biplab Roy
- Department
of Chemistry, University of North Bengal, Darjeeling 734013, West Bengal, India
| | - Pritam Guha
- Department
of Chemistry, University of North Bengal, Darjeeling 734013, West Bengal, India
| | - Priyam Chettri
- Department
of Chemistry, University of North Bengal, Darjeeling 734013, West Bengal, India
| | | | - Alexey G. Bykov
- Department
of Colloid Chemistry, St. Petersburg State University, Universitetskii
pr. 26, 198504 St.
Petersburg, Russia
| | - Alexander V. Akentiev
- Department
of Colloid Chemistry, St. Petersburg State University, Universitetskii
pr. 26, 198504 St.
Petersburg, Russia
| | - Boris A. Noskov
- Department
of Colloid Chemistry, St. Petersburg State University, Universitetskii
pr. 26, 198504 St.
Petersburg, Russia
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19
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Chabba S, Kumar S, Aswal VK, Kang TS, Mahajan RK. Interfacial and aggregation behavior of aqueous mixtures of imidazolium based surface active ionic liquids and anionic surfactant sodium dodecylbenzenesulfonate. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.02.032] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Bergström LM, Grillo I. Correlation between the geometrical shape and growth behaviour of surfactant micelles investigated with small-angle neutron scattering. SOFT MATTER 2014; 10:9362-9372. [PMID: 25342439 DOI: 10.1039/c4sm01800a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The correlation between the growth behaviour and geometrical shape for CTAB-rich mixed micelles formed by the cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) and the anionic surfactant sodium octyl sulphate (SOS) has been investigated with small-angle neutron scattering (SANS). Small tablet-shaped micelles formed by CTAB are found to grow only weakly in size with increasing surfactant concentration. The extent of growth becomes increasingly stronger as the fraction of SOS is increased. At higher fractions of SOS, a rather weak growth at low surfactant concentrations is followed by a sharp increase in aggregation numbers beyond a certain surfactant concentration. Such an abrupt transition from weakly to strongly growing micelles has been observed in the past for several micellar systems and is usually referred to as the second critical micelle concentration. The growth behaviour has been rationalized from a theoretical point of view by means of employing the recently developed general micelle model. The theory excellently predicts micellar growth behaviours as well as the observed correlation between the geometrical shape and micellar growth. In accordance, both width and length are found to slightly increase for weakly growing tablet-shaped micelles. On the other hand, strongly growing micelles that are observed above the second cmc display a completely different behaviour, according to which the length increases considerably while the width of the micelles decreases. Most interestingly, by means of optimizing the agreement between the general micelle model and experimentally determined aggregation numbers, we are able to determine the three bending elasticity constants: spontaneous curvature, bending rigidity and saddle-splay constant.
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Affiliation(s)
- L M Bergström
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Surface and Corrosion Science, SE-10044 Stockholm, Sweden.
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21
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Bergström LM. Explaining the growth behavior of surfactant micelles. J Colloid Interface Sci 2014; 440:109-18. [PMID: 25460696 DOI: 10.1016/j.jcis.2014.10.054] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 10/10/2014] [Accepted: 10/18/2014] [Indexed: 11/30/2022]
Abstract
The growth behavior of surfactant micelles has been investigated from a theoretical point of view. It is demonstrated that predictions deduced from the spherocylindrical micelle model, which considers micelles that are only able to grow in the length direction, are inconsistent with experimental measurements. Accordingly, the rise in aggregation numbers above a certain concentration, roughly corresponding to the second critical micelle concentration, appears to be much stronger than predicted by the spherocylindrical micelle model. On the other hand, predictions deduced from the general micelle model, which considers micelles that are able to grow with respect to both width and length, show excellent agreement with experimental observations. The latter theory is based on bending elasticity and it is demonstrated that the associated three parameters spontaneous curvature, bending rigidity and saddle-splay constant may all be determined for a micellar system from experimental measurements of the aggregation number as a function of surfactant concentration. The three parameters turn out to influence the appearance of a micellar growth curve rather differently. In accordance, the location of the second cmc is mainly determined by the saddle-splay constant and the bending rigidity. The shape of the growth curve, when going from the region of weakly growing micelles at low surfactant concentrations to strongly growing micelles above the second cmc, is mainly influenced by the bending rigidity.
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Affiliation(s)
- L Magnus Bergström
- KTH Royal Institute of Technology, School of Chemical Science and Engineering, Department of Chemistry, Surface and Corrosion Science, SE-10044 Stockholm, Sweden.
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