Interaction between a hydrophobic rigid face and a flexible alkyl tail: Thermodynamics of self-assembling of sodium cholate and SDS

Bai, Guangyue; Sheng, Jianhui; Wang, Yujie; Wu, Hui; Zhao, Yang; Zhuo, Kelei; Bastos, Margarida

doi:10.1016/j.jct.2016.04.019

Cited by 13 publications

(3 citation statements)

References 54 publications

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“…5C ) ( 43 , 44 ). Because of the different effects of temperature on the solubility of SDS and SC, the ratio of SDS/SC in the cosurfactant coating adsorbed on SWCNTS is likely altered at lowered temperatures ( 42 , 56 ). (6, 5) SWCNTs exhibit a greater redshifts than (9, 1) SWCNTs ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Compared to the headtail surfactant SDS, SC shows a lower self-aggregation tendency and allows tighter SC coating of the SWCNT surface by accommodating the SWCNT curvature and wrapping around the SWCNTs like a ring, preventing the adsorption of SWCNTs on gel (53), while SDS is prone to form a more loosely packed structure owing to van der Waals interactions on SWCNT surfaces (54,55), allowing for a stronger interaction of SWCNTs with the gel. Several studies have reported that the flexible alkyl chains of SDS tend to interact with the nonplanar hydrophobic -faces of SC molecules to form compound micelles of SDS/SC (56)(57)(58)(59). We propose that the introduced SDS molecules likely shift the dynamic equilibrium of the physisorption of SC molecules on SWCNTs and destroy the well-packed SC coating by removing a fraction of monomeric SC molecules on SWCNTs and forming SDS/SC compound (cosurfactant) that loosely coat the SWCNTs, leading to increase in the exposure area of SWCNT sidewalls (as shown in Fig.…”

Section: Detecting the Temperature-driven Surfactant Coating Changementioning

confidence: 99%

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Submilligram-scale separation of near-zigzag single-chirality carbon nanotubes by temperature controlling a binary surfactant system

Yang

Wei

et al. 2021

Sci. Adv.

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Mass production of zigzag and near-zigzag single-wall carbon nanotubes (SWCNTs), whether by growth or separation, remains a challenge, which hinders the disclosure of their previously unknown property and practical applications. Here, we report a method to separate SWCNTs by chiral angle through temperature control of a binary surfactant system of sodium cholate (SC) and SDS in gel chromatography. Eleven types of single-chirality SWCNT species with chiral angle less than 20° were efficiently separated including multiple zigzag and near-zigzag species. Among them, (7, 3), (8, 3), (8, 4), (9, 1), (9, 2), (10, 2), and (11, 1), were produced on the submilligram scale. The spectral detection results indicate that lowering the temperature induced selective adsorption and reorganization of the SC/SDS cosurfactants on SWCNTs with different chiral angles, amplifying their interaction difference with gel. We believe that this work is an important step toward industrial separation of single-chirality zigzag and near-zigzag SWCNTs.

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Section: Resultsmentioning

confidence: 99%

Section: Detecting the Temperature-driven Surfactant Coating Changementioning

confidence: 99%

Submilligram-scale separation of near-zigzag single-chirality carbon nanotubes by temperature controlling a binary surfactant system

Yang

Wei

et al. 2021

Sci. Adv.

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“…When the stripped DS ions form mixed micelles with cholate anions, the structural differences between the two same charged surfactants, SDS and NaCho, might cause strong interactions between their hydrophobic moieties. That is, the flexible alkyl chains of SDS and the hydrophobic surfaces of NaCho tend to enable more compact packing than pure SDS or NaCho 32 . The cholate anions might not be solubilized in the core of the SDS micelles because they have a hydrophilic surface on the reverse face of their hydrophobic surface.…”

Section: Removal Of Ds Ions Bound To the Proteinsmentioning

confidence: 99%

Removal of Dodecyl Sulfate Ions Bound to Human and Bovine Serum Albumins Using Sodium Cholate

Moriyama

Takeda

2020

J. Oleo Sci.

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Introduction Sodium dodecyl sulfate SDS is currently a widely used tool in the purification and characterization of proteins in many fields of biochemistry 1. A typical example is SDSpolyacrylamide gel electrophoresis SDS-PAGE , which is conventionally used to determine the molecular weights of proteins 2, 3. In this method, electrophoresis of SDS-protein complexes is carried out under the condition that the dodecyl sulfate DS ions are fully bound to all of the proteins in order to counteract their individual surface charges. Apart from SDS being used solely as a tool, the interaction itself between SDS and proteins has been widely investigated for more than 70 years 4 10. These studies have clarified that SDS induces distinct conformational changes in proteins. In SDS solution, for example, helical structures are partially disrupted in proteins having high helicity, whereas they are partially formed in proteins having low helicity. These structural changes are induced by the binding of DS ions. Therefore, much is known about

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High‐Efficiency Separation of Near‐Zigzag Single‐Chirality Carbon Nanotubes by Gel Chromatography

Li,

Yang,

et al. 2024

Physica Status Solidi (b)

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High‐efficiency production of near‐zigzag single‐chirality single‐wall carbon nanotubes (SWCNTs) is of great importance for their property study and applications. The key to separate near‐zigzag single‐chirality SWCNTs by gel chromatography is to selectively adsorb them in the gel medium. In this study, by using a high surfactant ratio of sodium dodecyl sulfate and sodium cholate (≥4:1) to modulate the selective adsorption of distinct (n, m) SWCNTs in a gel column, a high enrichment of near‐zigzag SWCNTs adsorbed in the gel column is achieved, which usually have a low abundance in raw materials due to their low growth efficiency. Afterward, (7, 3), (8, 3), (8, 4), (9, 1), and (9, 2) single‐chirality SWCNTs are separated with small chiral angles less than 17° by following a stepwise elution for their selective desorption. This simple and efficient separation technique will promote the research and application of near‐zigzag SWCNTs.

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Interaction between a hydrophobic rigid face and a flexible alkyl tail: Thermodynamics of self-assembling of sodium cholate and SDS

Cited by 13 publications

References 54 publications

Submilligram-scale separation of near-zigzag single-chirality carbon nanotubes by temperature controlling a binary surfactant system

Submilligram-scale separation of near-zigzag single-chirality carbon nanotubes by temperature controlling a binary surfactant system

Removal of Dodecyl Sulfate Ions Bound to Human and Bovine Serum Albumins Using Sodium Cholate

High‐Efficiency Separation of Near‐Zigzag Single‐Chirality Carbon Nanotubes by Gel Chromatography

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