Nanotubes Self-Assembled from Amphiphilic Molecules via Helical Intermediates

Barclay, Thomas G.; Constantopoulos, Kristina T.; Matisons, Janis G.

doi:10.1021/cr400085m

Cited by 217 publications

(240 citation statements)

References 523 publications

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“…These results could be compared with the different theories about self-assembled molecules and lipid tubes formation in order to determine precisely how these tubes are formed. [36][37][38][39][40][41] Our system based on 12-HSA as surfactant in combination with alkanolamine is known to exhibited excellent foamability and stability due to the presence of 12-HSA tubes in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 18 foaming, bulk and interfacial rheological properties, and drug delivery properties could be manipulate precisely in a wide range of temperatures. …”

Section: Resultsmentioning

confidence: 99%

Morphological Transition in Fatty Acid Self-Assemblies: A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds

2017

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In surfactant systems, the major role of the nature of the counterion in the surfactant behavior is well-known. However, the effect of the molar ratio between the surfactant and its counterion is less explored in the literature. We investigated the effect of the molar ratio (R) between 12-hydroxystearic acid (12-HSA) and various alkanolamines as a function of the temperature in aqueous solution from the molecular scale to the mesoscale. By coupling microscopy techniques and small-angle neutron scattering, we showed that 12-HSA self-assembled into multilamellar tubes and transitioned into micelles at a precise temperature. This temperature transition depended on both the molar ratio and the alkyl chain length of the counterion and could be precisely tuned from 20 to 75 °C. This thermal behavior was investigated by differential scanning calorimetry and wide-angle X-ray scattering. We highlighted that the transition at the supramolecular scale between tubes and micelles came from two different mechanisms at the molecular scale as a function of the molar ratio. At low R, with an excess of counterion, the transition came from the chain-melting phenomenon. At high R, with an excess of 12-HSA, the transition came from both the chain-melting process and the surface-melting process of the hydrogen bonds. At the mesoscale, this transition of supramolecular assemblies from tubes to micelles delimited a regime of high bulk viscosity, with a regime of low viscosity.

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Section: Resultsmentioning

confidence: 99%

Morphological Transition in Fatty Acid Self-Assemblies: A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds

2017

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“…[3][4][5][6] So, one can use a small amount of gemini surfactants instead of the large amount required for conventional surfactants to achieve the same results. 19,20 Imidazolium-based ionic liquids are a class of materials that have been extensively studied by the researchers in the past two decades due to their specific physicochemical properties. Due to their low CMCs, slow millisecond monomer-micelle kinetics 7 and smaller aggregation number, they are extensively used in the field of biochemical research, [8][9][10] gene delivery, [11][12][13] drug delivery 14,15 and antimicrobial activity.…”

Section: Introductionmentioning

confidence: 99%

Effect of spacer chain length on the liquid structure of aqueous dicationic ionic liquid solutions: molecular dynamics studies

Palchowdhury

Bhargava

2015

Phys. Chem. Chem. Phys.

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The liquid structure of aqueous solutions of five different imidazolium based gemini dicationic ionic liquids 1,n-bis(3-methylimidazolium-1-yl) alkane bromide (n being the length of the spacer alkyl chain), with propyl, pentyl, octyl, decyl and hexadecyl spacer chains has been studied using atomistic molecular dynamics simulations. While solutions with propyl and pentyl spacers are homogeneous, those with octyl and decyl spacers show spatial heterogeneity. Microscopic inhomogeneity in the bulk solution phase increases with an increase in the length of the spacer chain leading to polydisperse aggregates in the solution with a hexadecyl spacer. Organization of the cations at the solution-vapor interface also depends upon the length of the spacer chain with the most organized interfacial layer observed in the solution with a hexadecyl spacer chain.

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“…Families of synthetic self-assembled tubular molecular aggregates exist as well, mimicking chlorosomes with axial length up to the micron scale [11,41,42]. One such aggregate, composed of the dye molecule C8S3, has been recently characterized [14,43].…”

mentioning

confidence: 99%

Quantum Diffusion on Molecular Tubes: Universal Scaling of the 1D to 2D Transition

et al. 2016

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The transport properties of disordered systems are known to depend critically on dimensionality. We study the diffusion coefficient of a quantum particle confined to a lattice on the surface of a tube, where it scales between the 1D and 2D limits. It is found that the scaling relation is universal and independent of the temperature, disorder, and noise parameters, and the essential order parameter is the ratio between the localization length in 2D and the circumference of the tube. Phenomenological and quantitative expressions for transport properties as functions of disorder and noise are obtained and applied to real systems: In the natural chlorosomes found in light-harvesting bacteria the exciton transfer dynamics is predicted to be in the 2D limit, whereas a family of synthetic molecular aggregates is found to be in the homogeneous limit and is independent of dimensionality.

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Nanotubes Self-Assembled from Amphiphilic Molecules via Helical Intermediates

Cited by 217 publications

References 523 publications

Morphological Transition in Fatty Acid Self-Assemblies: A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds

Morphological Transition in Fatty Acid Self-Assemblies: A Process Driven by the Interplay between the Chain-Melting and Surface-Melting Process of the Hydrogen Bonds

Effect of spacer chain length on the liquid structure of aqueous dicationic ionic liquid solutions: molecular dynamics studies

Quantum Diffusion on Molecular Tubes: Universal Scaling of the 1D to 2D Transition

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