Investigation of the Thermodynamic Properties of the Cationic Surfactant CTAC in EG + Water Binary Mixtures

Yan, Jie; Dong, Wang; Bu, Fang; Yang, Fei

doi:10.1007/s10953-010-9551-8

Cited by 28 publications

(19 citation statements)

References 12 publications

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“…The value of a reflects hydrophobic effect of the alkyl chains and the electrostatic interactions both between head groups and between head-groups and the surrounding water molecules. [29] Figure 1 demonstrates a representative plot of specific conductivity (k) versus concentration (c) of TTAB in presence of different concentration of DEG. The two straight line plots having different slope intersect at point, which corresponds to the CMC values.…”

Section: Resultsmentioning

confidence: 99%

“…The thermodynamic tendency of micellization of cationic surfactant as function of glycol concentration in mixed solvent system at fixed temperature can be visualized by Gibbs energy of micellization (DG m ); for monomeric ionic surfactant calculated using Equation (1). [5,13,29,30,34] …”

Section: Resultsmentioning

confidence: 99%

“…The DG t is the difference between DG m in water-glycol (DG m (H 2 O-glycol)) mixed solvent system to that in pure water (DG mðH 2 OÞ ). DG t values are calculated using Equation (2) [5,13,29,30,34] and are recorded in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, an increase in the temperature causes a decrease in the charge density at micellar surface by lowering the aggregation number of micelle which leads to increase in a. [44,45] Information of temperature dependence of CMC and a value facilitate the calculation of the enthalpy of micellization [5,13,29,30,34] DH m ¼ À2RT 2 ð2 À aÞ d ln X CMC dT : ½3…”

Section: Thermodynamic Parameters Of Micellization In Presence Of Fixmentioning

confidence: 99%

“…[15] There is enormous literature that deals with effect of aqueous ethylene glycol (EG) on micellization of cationic, anionic and nonionic surfactants. [3][4][5][6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] From thermodynamic studies of micellization in presence of EG Ruiz [5,6] observed that due to lower cohesive energy of EG þwater mixed solvent system, aggregation number of micelles decreased. For alkyltrimethylammonium bromide surfactant in presence of aqueous EG and glycerol from electrochemical studies using surfactant selective electrode, Palepu and coworkers [3] concluded that logarithm of the critical micellar concentration (CMC) of surfactant is directly proportional to the solvent=water ratio expressed in weight percent.…”

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confidence: 99%

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Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Chavda

Bahadur

2013

Journal of Dispersion Science and Technology

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Effect of glycols viz., ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG) and tetraethylene glycol (TeEG) on micellization parameter of cationic surfactant tetradecyletrimethyl ammonium bromide (TTAB) was examined by means electrical conductivity measurements. The critical micelle concentration (CMC), degree of counterion dissociation (a) and Gibbs energy of micellization (DG m ) as well as Gibbs energy of transfer (DG t ) of surfactant tail from bulk phase to micellar phase as a functions glycol concentration at 303.15 K were evaluated. In ordered to obtain enthalpy (DH m ) and entropy (DS m ) of micellization, CMCs were determined in 10.0% of glycols in temperature range from 303.15 K to 323.15 K. Thermodynamic parameters of the micellization reveal that effectiveness of glycols to reduce micellization increases with concentration and with number of ethereal oxygen, [-O-] n in glycol molecule. INTRODUCTIONApplications of surfactants in fields like lubrication or oil-wetting cleaners and detergency require the use of surfactant in either a water-free or water-poor medium. This has stimulated a significant amount of interest towards the micellization of various surfactants in non-aqueous, polar organic media [1,2] and in mixed solvent having a significant amount of a polar solvent mixed with water. [3][4][5][6][7][8][9][10][11][12] Glycols are well known for their use as coolants and antifreezes and find application in pharmaceutical, cosmetics, and food industries. [13] In most these applications, surfactant is also present and, therefore, it is important to study the effect of glycol on micellization of surfactants. The properties of surfactant micelles can change significantly as the polar glycol solvent replaces the water in the system. Also, the addition of glycols to aqueous micellar surfactant solutions provides an opportunity to study the so called solvophobic effect (as opposed to the hydrophobic effect), which is used to describe micellization in polar solvent [3,14] The micellization in these solvents is similar in many aspects to the micellization in water although micellization is not as favorable as in water for given surfactant. [15] There is enormous literature that deals with effect of aqueous ethylene glycol (EG) on micellization of cationic, anionic and nonionic surfactants. [3][4][5][6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] From thermodynamic studies of micellization in presence of EG Ruiz [5,6] observed that due to lower cohesive energy of EG þwater mixed solvent system, aggregation number of micelles decreased. For alkyltrimethylammonium bromide surfactant in presence of aqueous EG and glycerol from electrochemical studies using surfactant selective electrode, Palepu and coworkers [3] concluded that logarithm of the critical micellar concentration (CMC) of surfactant is directly proportional to the solvent=water ratio expressed in weight percent. They have also investigate the effect of EG on binary mixtures of alkyltriphenylphosphonium brom...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Thermodynamic Parameters Of Micellization In Presence Of Fixmentioning

confidence: 99%

mentioning

confidence: 99%

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Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Chavda

Bahadur

2013

Journal of Dispersion Science and Technology

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Hexafluoroisopropyl Trifluoromethanesulfonate‐Driven Easily Li⁺ Desolvated Electrolyte to Afford Li||NCM811 Cells with Efficient Anode/Cathode Electrolyte Interphases

Liu

et al. 2021

Adv Funct Materials

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Solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) with optimized components and structures are considered to be crucial for lithium‐ion batteries. Here, gradient lithium oxysulfide (Li2SOx, x = 0, 3, 4)/uniform lithium fluoride (LiF)‐type SEI is designed in situ by using hexafluoroisopropyl trifluoromethanesulfonate (HFPTf) as electrolyte additive. HFPTf is more likely to be reduced on the surface of Li anode in electrolytes due to its high reduction potential. Moreover, HFPTf can make Li+ desolvated easily, leading to the increase in the flux of Li+ on the surface of Li anode to avoid the growth of Li dendrites. Thus, the cycling stability of Li||Li symmetric cells is improved to be 1000 h at 0.5 mA cm−2. In addition, HFPTf‐contained electrolyte could make Li||NCM811 batteries with a capacity retention of 70% after 150 cycles at 100 mA g−1, which is attributed to the formation of uniform and stable CEI on the cathode surface for hindering the dissolvation of metal ions from the cathode. This study provides effective insights on the strong ability of additives to adjust electrolytes in “one phase and two interphases” (electrolyte and SEI/CEI).

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Gradient Solid Electrolyte Interphase and Lithium‐Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium Metal Batteries

Liu

et al. 2021

Angewandte Chemie

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The structures and components of solid electrolyte interphase (SEI) are extremely important to influence the performance of full cells, which is determined by the formulation of electrolyte used. However, it is still challenging to control the formation of high‐quality SEI from structures to components. Herein, we designed bisfluoroacetamide (BFA) as the electrolyte additive for the construction of a gradient solid electrolyte interphase (SEI) structure that consists of a lithophilic surface with C−F bonds to uniformly capture Li ions and a LiF‐rich bottom layer to guide the rapid transportation of Li ions, endowing the homogeneous deposition of Li ions. Moreover, the BFA molecule changes the Li+ solvation structure by reducing free solvents in electrolyte to improve the antioxidant properties of electrolyte and prevent the extensive degradation of electrolyte on the cathode surface, which can make a superior cathode electrolyte interphase (CEI) with high‐content LiF.

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Investigation of the Thermodynamic Properties of the Cationic Surfactant CTAC in EG + Water Binary Mixtures

Cited by 28 publications

References 12 publications

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Hexafluoroisopropyl Trifluoromethanesulfonate‐Driven Easily Li⁺ Desolvated Electrolyte to Afford Li||NCM811 Cells with Efficient Anode/Cathode Electrolyte Interphases

Gradient Solid Electrolyte Interphase and Lithium‐Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium Metal Batteries

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Investigation of the Thermodynamic Properties of the Cationic Surfactant CTAC in EG + Water Binary Mixtures

Cited by 28 publications

References 12 publications

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Thermodynamic Study of a Cationic Surfactant in Aqueous Solution Containing Ethylene Glycol and Its Oligomers: Effect of Number of Ethereal Oxygen Atoms in Glycols Molecule

Hexafluoroisopropyl Trifluoromethanesulfonate‐Driven Easily Li+ Desolvated Electrolyte to Afford Li||NCM811 Cells with Efficient Anode/Cathode Electrolyte Interphases

Gradient Solid Electrolyte Interphase and Lithium‐Ion Solvation Regulated by Bisfluoroacetamide for Stable Lithium Metal Batteries

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Product

Resources

About

Hexafluoroisopropyl Trifluoromethanesulfonate‐Driven Easily Li⁺ Desolvated Electrolyte to Afford Li||NCM811 Cells with Efficient Anode/Cathode Electrolyte Interphases