Studies on physicochemical properties of three Gemini surfactants with different spacer groups

Cao, Yupeng; Yang, Weiguang; Jiang, Yonghai; Wang, Yakui; Ju, Hongbin

doi:10.1016/j.molliq.2020.115039

Cited by 28 publications

(17 citation statements)

References 51 publications

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“…There are several factors influencing the value of CMC of cationic GS, such as the following: temperature, chemical structure, and the presence of other substances in the solution [ 1 ]. Construction elements affecting CMC values are the length or nature of the spacer [ 68 , 81 , 82 , 83 , 84 , 85 , 86 , 87 ] and the kind of counter ion [ 69 , 88 , 89 ]. However, the length of hydrocarbon substituent affects the greatest impact on surface activity [ 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 ].…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity of Gemini Surfactants with Ether Group in the Spacer Part

et al. 2021

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Due to their large possibility of the structure modification, alkylammonium gemini surfactants are a rapidly growing class of compounds. They exhibit significant surface, aggregation and antimicrobial properties. Due to the fact that, in order to achieve the desired utility effect, the minimal concentration of compounds are used, they are in line with the principle of greenolution (green evolution) in chemistry. In this study, we present innovative synthesis of the homologous series of gemini surfactants modified at the spacer by the ether group, i.e., 3-oxa-1,5-pentane-bis(N-alkyl-N,N-dimethylammonium bromides). The critical micelle concentrations were determined. The minimal inhibitory concentrations of the synthesized compounds were determined against bacteria Escherichia coli ATCC 10536 and Staphylococcus aureus ATCC 6538; yeast Candida albicans ATCC 10231; and molds Aspergillus niger ATCC 16401 and Penicillium chrysogenum ATCC 60739. We also investigated the relationship between antimicrobial activity and alkyl chain length or the nature of the spacer. The obtained results indicate that the synthesized compounds are effective microbicides with a broad spectrum of biocidal activity.

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Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity of Gemini Surfactants with Ether Group in the Spacer Part

et al. 2021

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“…The methylene−(CH 2 ) n − and N + (CH 3 ) 3 groups in the GS curve were observed at 923 and 720 cm −1 , which verified the successful synthesis of GS. 43,46 The characteristic peaks of pure PPy-GS were observed at 1548 and 1460 cm −1 , which corresponded to symmetric and antisymmetric ring stretching vibrations of the pyrrole ring. The peaks at 1290 and 1031 cm −1 were assigned to C−N stretching vibrations and C−H in-plane vibration, respectively.…”

Section: Structural Characterization and Morphology Of Ppy-gs Compositesmentioning

confidence: 99%

A Simple Route to Fabricate Ultralong and Uniform Polypyrrole Nanowires with High Electrochemical Capacitance for Supercapacitor Electrodes

Wang

Zhang

et al. 2023

ACS Appl. Polym. Mater.

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This work demonstrated a straightforward strategy to fabricate ultralong interconnected polypyrrole (PPy-GS) nanowires with a gemini surfactant (GS) as a soft template and dopant. Pure PPy particles and a PPy nanowire doped with CTAB (PPy-CTAB) were prepared for comparison. The results showed that the electrochemical performances, conductivity, and morphology of PPy-GS could be significantly changed by changing the concentration of GS in the aqueous phase owing to the different self-assembly behaviors. When the molar ratio of pyrrole, APS, and GS was 1:1:0.4, an interconnected ultralong and uniform PPy-GS nanowire with the largest surface area, the smallest average pore size, the lowest contact angle, and the highest conductivity can be obtained, resulting in the formation of effective electrolyte transport channels and faster electron transport pathways. Compared with pure PPy particles and the PPy-CTAB nanowire, the incorporation of GS significantly enhanced the conductivity and specific capacitance of PPy-GS-40%. The conductivity of PPy-GS-40% was up to 13.54 S/cm compared with 1.17 S/cm for PPy particles and 3.84 S/cm for the PPy-CTAB nanowire. Also, the highest specific capacitance of PPy-GS reached up to 556 F/g at 1 A/g compared with 233 F/g for PPy particles and 397 F/g for the PPy-CTAB nanowire. A total of 85.4% of the initial capacitance was retained even after 2000 cycles at 1.0 A/g. The energy density and power density of the PPy-GS-40% symmetrical supercapacitor were 49.4 Wh/kg and 400 W/kg, respectively. The good electrochemical properties of the PPy-GS electrode suggest a tremendous potential in the high-performance electrode not only for supercapacitors but extensively for various energy storage applications.

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“…Due to the insertion of phenyl into the hydrophobic region formed by the erucic acid tails, the arrangement among surfactants is more compact. The anionic/cationic surfactants blended systems are widely used because the addition of surfactants with opposite headgroup properties helps to reduce the repulsion between head groups in surfactant micelles and form stable and dense micelles. ,, Friesen et al systematically studied the composite performance of the cationic gemini surfactant and the anionic surfactant and found that the surfactant ratio, surfactant concentration, surfactant hydrophobic tail length, salinity, and temperature all have effects on the viscosity of the VES fluid. It was found that at high cation/anion ratios, the fluid was not resistant to high temperatures.…”

Section: High-temperature-resistant Ves Fracturing Fluidsmentioning

confidence: 99%

“…Water-based fracturing fluids are more environmentally friendly and safer than oil-based fracturing fluids and play a leading role in hydraulic fracturing. − The thickener is the core component of the water-based fracturing fluids, which can be divided into two categories: polymer and viscoelastic surfactant (nonpolymer) . Polymers can be further divided into biopolymers (mainly guar-based) and synthetic polymers (mainly polyacrylamide-based).…”

Section: Introductionmentioning

confidence: 99%

Review on High-Temperature-Resistant Viscoelastic Surfactant Fracturing Fluids: State-of-the-Art and Perspectives

Liu

et al. 2023

Energy Fuels

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A viscoelastic surfactant (VES) fluid is an important part of a water-based fracturing fluid. As oil and gas exploration expands into deep, high-temperature, low-permeability reservoirs, the conventional VES fracturing fluid has shown great limitations. The high-temperature-resistance mechanisms of the high-temperature-resistant VES fracturing fluids in publicly available literature were analyzed from five aspects: single-chain surfactant system, oligomeric surfactant system, counterion effect, blended surfactant system, and nano-enhanced VES system. The friction-reduction performance, sand-carrying performance, gel-breaking performance, and core-damage performance of these systems were summarized. The results show that oligomeric surfactants with a monounsaturated hydrophobic long chain (>C21) are most likely to be used for VES fracturing fluids in high-temperature reservoirs, but the loading of the surfactants is still relatively high (3–5 wt %). By reducing the repulsion among polar headgroups to effectively decrease the area of head groups, or/and penetrating into the nonpolar cores based on hydrophobic interaction to increase the average hydrophobic volume of hydrophobic tails, counterions affect the performance of VESs. The aromatic counterion salts are preferred choices for improving the temperature resistance, friction reduction, and suspended sand performance of VES fluids. The blended surfactant/synthetic polymer systems based on noncovalent interaction improve the temperature resistance of VES fluids and reduce the loading of the surfactants to a certain extent. Based on the “pseudo-cross-linking” of nanomaterials and wormlike micelles, a very small amount of nanomaterials can improve the temperature resistance of VES fluids and reduce the loading of the surfactants. The most essential and effective method to improve the temperature resistance of VES fluids for fracturing is the molecular structure design based on the packing parameter theory. However, the synthesis process or route still needs further optimization to reduce production costs. In addition, given the excellent performance of VES fluids enhanced by nanomaterials, further research should be conducted on the influence mechanism of nanomaterial type and geometric features on the performance of VESs, as well as the potential harmfulness of nanomaterials, to promote the field-scale application of nano-enhanced VES fluids.

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Studies on physicochemical properties of three Gemini surfactants with different spacer groups

Cited by 28 publications

References 51 publications

Antimicrobial Activity of Gemini Surfactants with Ether Group in the Spacer Part

Antimicrobial Activity of Gemini Surfactants with Ether Group in the Spacer Part

A Simple Route to Fabricate Ultralong and Uniform Polypyrrole Nanowires with High Electrochemical Capacitance for Supercapacitor Electrodes

Review on High-Temperature-Resistant Viscoelastic Surfactant Fracturing Fluids: State-of-the-Art and Perspectives

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