Dynamics of Lyotropic Liquid Crystal Phases of Surfactants and Lipids and of Transitions Between These Phases

Zana, R.

doi:10.1201/9781420028225.ch7

Cited by 11 publications

(13 citation statements)

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“…Experimental observation showed that liposomes could maintain their integrity in the nonfrozen aqueous media from 60 days (Hsieh et al, 2002 ; Kim et al, 2004 ) to a year (Sakai et al, 2000 ; Zana, 2005 ; Tokuno et al, 2016 ), even at +40°C (Sakai et al, 2000 ). Therefore, we can hypothesize similar longevity of prebiotic liposomes, which allows the hypothesis to apply an important concept of the Lipid World model: autocatalytic replication of amphiphiles, their mutation, and selection of the fittest amphiphilic assemblies.…”

Section: The Extended Version Of Our Modelmentioning

confidence: 99%

Exploring the Lipid World Hypothesis: A Novel Scenario of Self-Sustained Darwinian Evolution of the Liposomes

Субботин

Fiksel

2023

Astrobiology

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According to the Lipid World hypothesis, life on Earth originated with the emergence of amphiphilic assemblies in the form of lipid micelles and vesicles (liposomes). However, the mechanism of appearance of the information molecules (ribozymes/RNA) accompanying that process, considered obligatory for Darwinian evolution, is unclear. We propose a novel scenario of self-sustained Darwinian evolution of the liposomes driven by ever-present natural phenomena: solar UV radiation, day/night cycle, gravity, and the formation of liposomes in an aqueous media. The central tenet of this scenario is the liposomes' encapsulation of the heavy solutes, followed by their gravitational submerging in the water. The submerged liposomes, being protected from the damaging UV radiation, acquire the longevity necessary for autocatalytic replication of amphiphiles, their mutation, and the selection of those amphiphilic assemblies that provide the greatest membrane stability. These two sets of adaptive compositional information (heavy content and amphiphilic assemblies design) generate a population of liposomes with self-replication/reproduction properties, which are amendable to mutation, inheritance, and selection, thereby establishing Darwinian progression. Temporary and spatial expansion of this liposomal population will provide the basis for the next evolutionary step—a transition of accidentally entrapped RNA precursor molecules into complex functional molecules, such as ribozymes/RNA.

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Section: The Extended Version Of Our Modelmentioning

confidence: 99%

Exploring the Lipid World Hypothesis: A Novel Scenario of Self-Sustained Darwinian Evolution of the Liposomes

Субботин

Fiksel

2023

Astrobiology

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“…Only three of these were written by authors in a very consistent way like the fundamental and practical basics in "surfactant science and applications" by M. J. Rosen, 6 the "microemulsion formulation review" by M. Bourrel and R. S. Schechter, 15 and the very recent tutorial screening on "emulsions, microemulsions and foams" by D. Langevin, 3 who included both words emulsion and microemulsion in the title, thus clearly indicating that they have different meanings. The other selected books on "microemulsions" in their title were edited by notable contributors like L. Prince, 16 K. L. Mittal, 17 M. Fanun, 18 P. Kumar and K. L. Mittal, 19 C. Stubenrauch, 20 L. E. Scriven and K. L. Mittal, 21 R. Zana, 22 and J. N. Israelachvili. 23 These selected references include the most influential opinions and some controversies on the topic of microemulsion structures and curvature meanings in the last 50 years from the most productive researchers on the topics who presented talks at numerous conferences.…”

Section: ■ Introductionmentioning

confidence: 99%

Review on Some Confusion Produced by the Bicontinuous Microemulsion Terminology and Its Domains Microcurvature: A Simple Spatiotemporal Model at Optimum Formulation of Surfactant-Oil-Water Systems

et al. 2023

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Fundamental studies have improved understanding of molecular-level properties and behavior in surfactant-oil-water (SOW) systems at equilibrium and under nonequilibrium conditions. However, confusion persists regarding the terms “microemulsion” and “curvature” in these systems. Microemulsion refers to a single-phase system that does not contain distinct oil or water droplets but at least four different structures with globular domains of nanometer size and sometimes arbitrary shape. The significance of “curvature” in such systems is unclear. At high surfactant concentrations (typically 30 wt % or more), a single phase zone has been identified in which complex molecular arrangements may result in light scattering. As surfactant concentration decreases, the single phase is referred to as a bicontinuous microemulsion, known as the middle phase in a Winsor III triphasic system. Its structure has been described as involving simple or multiple surfactant films surrounding more or less elongated excess oil and water phase globules. In cases where the system separates into two or three phases, known as Winsor I or II systems, one of the phases, containing most of the surfactant, is also confusedly referred to as the microemulsion. In this surfactant-rich phase, the only curved objects are micellar size structures that are soluble in the system and have no real interface but rather exchange surfactant molecules with the external liquid phase at an ultrafast pace. The use of the term “curvature” in the context of these complex microemulsion systems is confusing, particularly when applied to merged nanometer-size globular or percolating domains. In this work, we discuss the terms “microemulsion” and “curvature”, and the most simple four-dimensional spatiotemporal model is proposed concerning SOW equilibrated systems near the optimum formulation. This model explains the motion of surfactant molecules due to Brownian movement, which is a quick and arbitrary thermal fluctuation, and limited to a short distance. The resulting observation and behavior will be an average in time and in space, leading to a permanent change in the local microcurvature of the aggregate, thus changing the average from micelle-like to inverse micelle-like order over an extremely short time. The term “microcurvature” is used to explain the small variations of globule size and indicates a close-to-zero mean curvature of the surfactant-containing film surface shape.

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“…16,17 Such RMs have found academic relevance due to their pervasive presence in several applications -for examplein lubrication, nanoparticle synthesis and recovery, home and personal care products, etc. 16,18,19 The low o regime where the RMs with anisotropic nanostructures form and their anomalous behavior in physical properties (such as viscosity) have received very little attention in the literature. 16,[20][21][22] While theory based on square well colloidal fluid model predict a linear scaling of viscosity with o at a constant volume fraction, the experiments show higher values of viscosity than these predictions.…”

Section: Introductionmentioning

confidence: 99%

Modulating shape transition in surfactant stabilized reverse microemulsions

Rastogi,

Honecker,

Alba Venero

et al. 2023

Soft Matter

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Dynamics of Lyotropic Liquid Crystal Phases of Surfactants and Lipids and of Transitions Between These Phases

Cited by 11 publications

References 0 publications

Exploring the Lipid World Hypothesis: A Novel Scenario of Self-Sustained Darwinian Evolution of the Liposomes

Exploring the Lipid World Hypothesis: A Novel Scenario of Self-Sustained Darwinian Evolution of the Liposomes

Review on Some Confusion Produced by the Bicontinuous Microemulsion Terminology and Its Domains Microcurvature: A Simple Spatiotemporal Model at Optimum Formulation of Surfactant-Oil-Water Systems

Modulating shape transition in surfactant stabilized reverse microemulsions

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