Self-Aggregation and Liquid Crystalline Behavior of New Ester-Functionalized Quinuclidinolium Surfactants

Bhadani, Avinash; Endo, Takeshi; Koura, Setsuko; Sakai, Kenichi; Abe, Masahiko; Sakai, Hideki

doi:10.1021/la502098h

Cited by 16 publications

(14 citation statements)

References 36 publications

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“…A substantial part of research interest is devoted to gemini surfactants with ester groups. They can be located either in the hydrophobic tails of gemini molecules [9,10,11,12,13] or in their spacers [14,15,16,17,18,19,20,21,22]. It was found that the presence of ester bonds in the gemini surfactant molecular structure affects the physico-chemical and aggregation properties of these surfactants, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the presence of ester bonds in the gemini surfactant molecular structure affects the physico-chemical and aggregation properties of these surfactants, e.g. it increases the hydrophilicity and aqueous solubility of gemini species [9,22], changes the cmc and increases the micellar solubilisation capacity [14,15]. More pronounced morphological changes of aggregates composed of gemini surfactants with diester groups in the spacer were found for surfactant molecules with longer tail lengths (16 carbon atoms) [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Self-Assembly Properties of Cationic Gemini Surfactants with Biodegradable Groups in the Spacer

et al. 2019

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: Self-assembly properties of cationic gemini surfactants with biodegradable amide or ester groups in the spacer were investigated utilising time-resolved fluorescence quenching, dynamic light scattering and zeta potential measurements. A correlation between aggregation parameters such as micelle aggregation number, micelle size and zeta potential with the structure of gemini molecules was made. For gemini molecules with medium spacer lengths, micelle aggregation number does not change much with the surfactant concentration. When the spacer is extended, a stronger aggregation tendency is observed for gemini surfactant molecules with two ester groups in the spacer and the aggregation number increases. The assumption of stronger aggregation of ester-based gemini molecules at larger spacer number values is also documented by measurements of the size and zeta potential of ester-based micelles. The explanation of the difference in aggregation ability of amide-based and ester-based gemini molecules is related to the structural features of gemini molecules, notably to the larger flexibility and denser arrangement of ester-based gemini molecules in a micelle. To support this assumption, optimised 3D models of the studied gemini molecules were constructed. Correspondingly, the calculations show smaller size and interfacial area for ester-based gemini conformers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self-Assembly Properties of Cationic Gemini Surfactants with Biodegradable Groups in the Spacer

et al. 2019

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“…All data were normalized to the same incident primary beam intensity for the transmission calibration and were corrected for background scattering from the capillary and the solvent. 76…”

Section: Methodsmentioning

confidence: 99%

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

et al. 2017

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The micellar solution and the lyotropic liquid crystalline phases formed by gemini surfactants containing morpholinium headgroups are investigated for their self-aggregation and physicochemical properties in water. These gemini surfactants demonstrated good surface activity because they are able to undergo micellization at lower concentration and form nanosized micellar aggregates in dilute aqueous solution. The binary mixture of the morpholinium gemini surfactant–water system is investigated over a wide range of concentrations. The micellar solution of the morpholinium gemini surfactants demonstrated Newtonian fluidlike behavior between 10 and 50 wt % as the observed viscosities were independent of the applied shear rate. At higher concentration, morpholinium geminis formed self-assembled lyotropic phases in water. These liquid crystalline phases were characterized by small-angle X-ray scattering and polarized optical microscopy techniques.

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“…For the determination of the CMC value, an adequate quantity of a concentrated surfactant solution was added to water in order to change the surfactant concentration from concentrations well below the critical micelle concentration (CMC) to up to at least 2-3 times the CMC. 37,38…”

Section: Conductivity Measurementsmentioning

confidence: 99%

New ester based gemini surfactants: the effect of different cationic headgroups on micellization properties and viscosity of aqueous micellar solution

Bhadani

Tani

Endo

et al. 2015

Phys. Chem. Chem. Phys.

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A new series of ester functionalized cationic gemini surfactants having different cationic headgroups (i.e. piperidinium, pyrrolidinium, morpholinium and quaternary ammonium) have been synthesized and characterized using NMR and Mass spectroscopy. These new gemini surfactants were investigated for their micellization and viscosity properties using surface tension, conductivity, fluorescence and rheology thechniques. The physicochemical properties of the aqueous surfactant system were influenced by polarity, size and the nature of cationic headgroups as the surface, thermodynamic and viscosity properties of these gemini surfactants were found to be dependent on the type of cationic headgroup. The current research finding establishes the structure-property relationship of the surfactant molecule specifically taking into account the dominant role displayed by the nature of the cationic headgroup.

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Self-Aggregation and Liquid Crystalline Behavior of New Ester-Functionalized Quinuclidinolium Surfactants

Cited by 16 publications

References 36 publications

Self-Assembly Properties of Cationic Gemini Surfactants with Biodegradable Groups in the Spacer

Self-Assembly Properties of Cationic Gemini Surfactants with Biodegradable Groups in the Spacer

Physicochemical Evaluation of Micellar Solution and Lyotropic Phases Formed by Self-Assembled Aggregates of Morpholinium Geminis

New ester based gemini surfactants: the effect of different cationic headgroups on micellization properties and viscosity of aqueous micellar solution

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