Coacervate formation by aerosol OT with sodium chloride

Acharya, Rashmi; Ecanow, Bernard; Balagot, Reuben C.

doi:10.1016/0021-9797(72)90181-6

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…reported the phase separation emerged in the mixtures of cationic ammonium surfactants Hyamine@1622 and inorganic salts (e. g., NaCl), [33,34] in which spherical micelles transformed into cylindrical micelles with the addition of inorganic salts, due to the screening of electrostatic repulsion between headgroups. Similar phenomenon was reported in the mixture of aerosol OT (AOT)/NaCl [65] . In the solution of nonionic surfactant alkyl polyglucoside (APGs) solution, surfactant coacervation was observed with the addition of inorganic salts (e. g., NaCl, KCl and CaCl 2 ), [66] in which the addition of inorganic salts lowered the cloud point and promoted thermo‐responsiveness of APGs.…”

Section: Coacervation Of Small Amphiphilessupporting

confidence: 67%

Small Amphiphile‐Based Coacervation

Xiao

Jia

Huang

et al. 2022

Chemistry An Asian Journal

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Coacervation plays an important role in the molecular assembly towards soft materials with a diversity of function (e. g., underwater adhesives of mussels and membraneless organelles). Coacervation is observed when one homogenous solution spontaneously separates into two immiscible liquid phases of low and high solute concentration, also known as liquid-liquid phase separation (LLPS), which enables spatiotemporally local concentration of specific molecules. LLPS is a common physical phenomenon in aqueous solutions of polyelectrolytes, surfactants and biomolecules, which has been extensively explored for applica-tions in the fields of environmental remediation, cosmetic formulation, protein purification, extractive fermentation and pharmaceutical microencapsulation. This review summarizes the development of LLPS with low molecular weight amphiphiles to construct simple and complex coacervates using conventional surfactants and novel amphiphiles such as azobenzene-derivatives and peptides. We also highlight the applications of these amphiphile coacervates in the extraction of biomolecules, construction of protocell models and drug delivery.

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Section: Coacervation Of Small Amphiphilessupporting

confidence: 67%

Small Amphiphile‐Based Coacervation

Xiao

Jia

Huang

et al. 2022

Chemistry An Asian Journal

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“…For comparison purposes, we applied the cryo-HRSEM method to droplets of AOT/NaCl/water, a classical coacervate that we and many others have examined in the past. ,,, Figure shows an image of such a droplet at a 40000× instrumental magnification. Surface pores, if they exist at all, fall below the resolution of the experiment.…”

mentioning

confidence: 99%

A Sponge Morphology in an Elementary Coacervate

et al. 2000

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A zwitterionic gemini surfactant forms a coacervate which is "elementary" in the sense that it consists of a single solute as opposed to the multicomponents (e.g., cetylpyridinium chloride/hexanol/water/NaCl) common in the coacervate literature. The gemini dissolves in water but then quickly separates as oily droplets which, despite the high water content of 83 wt %, are immiscible with water. Cryogenic temperature high-resolution scanning electron microscopy (cryo-HRSEM) examination of the droplets shows a distinct "sponge" structure. Although previously proposed for coacervate phases, a sponge morphology has never before been clearly depicted. The absence of previous electron microscopy (EM) pictures of the coacervate network is attributed to artifacts associated with transmission electron microscopy (TEM) methods, to the fragility of the coacervate toward physical perturbations, and to possible compositional changes with complex mixtures during sample preparation. When the gemini coacervate was exposed to mild shear, the honeycomb structure disappeared and was replaced by a lamellar phase.

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“…For the one-head and two-tail negatively charged surfactant Aerosol OT (AOT) reported by Menger and Sykes, 67 AOT in aqueous solution selfassembles into vesicles and the vesicles change into coacervates by introducing alkali metals (Cs + , K + , Li + , Na + , Rb + ). Although the AOT coacervate was previously observed by Acharya et al, 68 Menger and Sykes did more thorough work on the system. The coacervate was rationalized in terms of positive-to-negative changes in the spontaneous mean curvature (H 0 ) of the AOT bilayers, which was caused by decreased electrostatic repulsion among the AOT head groups.…”

Section: Coacervation Of Surfactants With Additivesmentioning

confidence: 92%

Development of surfactant coacervation in aqueous solution

Wang

2014

Soft Matter

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Coacervation is a phenomenon in which a colloidal dispersion separates into two immiscible liquid phases: a liquid rich in colloidal phase in equilibrium with another diluted liquid phase. Surfactant coacervation here refers to coacervation whose main components are surfactants with low molecular weights. Over the past two decades, surfactants have been greatly developed and studies on coacervation in systems of novel surfactants have been reported. This review summarizes the development of coacervation occurring in monomeric surfactants, one-head and two-tail surfactants, gemini surfactants and their mixtures. The effects of surfactant molecular structure and external conditions on critical conditions for coacervation, structures of precursors and coacervates, and their relationships are described. The effects of inorganic salts, alcohols and organic salts on surfactant coacervation are also reviewed.

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Coacervate formation by aerosol OT with sodium chloride

Cited by 10 publications

References 2 publications

Small Amphiphile‐Based Coacervation

Small Amphiphile‐Based Coacervation

A Sponge Morphology in an Elementary Coacervate

Development of surfactant coacervation in aqueous solution

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