An induction current method for determining the critical micelle concentration and the polarity of surfactants

Song, Yongxin; Sun, Ren; Zhao, Kai; Pan, Xinxiang; Zhou, Hao; Li, Dongqing

doi:10.1007/s00396-015-3536-5

Cited by 18 publications

(22 citation statements)

References 50 publications

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“…This method has previously been used to measure the CMC of colloidal suspensions of vitamins and various salts . More recently, this method has been effective in measuring the CMC of larger molecules . We applied this method to determine the CMC of polymeric macrosurfactants (identified in Table ) for KHIs.…”

Section: Resultsmentioning

confidence: 99%

“…A simple method to determine the critical micelle concentration (CMC) has recently been reported, whereby the surface (zeta potential) charge of the block copolymer in solution can be correlated with CMC. 29 This surface charge is expected to decrease with increasing concentrations until all polymers have formed micelles (CMC) and the surface charge plateaus. 12,29,30 This method has been used mostly with small surfactants but has not been applied with large molecular weight amphiphilic block copolymers.…”

mentioning

confidence: 99%

“…29 This surface charge is expected to decrease with increasing concentrations until all polymers have formed micelles (CMC) and the surface charge plateaus. 12,29,30 This method has been used mostly with small surfactants but has not been applied with large molecular weight amphiphilic block copolymers.…”

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confidence: 99%

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Poly(styrene/pentafluorostyrene)‐block‐poly(vinyl alcohol/vinylpyrrolidone) amphiphilic block copolymers for kinetic gas hydrate inhibitors: Synthesis, micellization behavior, and methane hydrate kinetic inhibition

Rajput

Colantuoni

Bayahya

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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Amphiphilic block copolymers of short poly(styrene) (PS) or poly(2,3,4,5,6‐pentafluorostyrene) (PPFS) segments with comparatively longer poly(vinyl acetate) or poly(vinylpyrrolidone) (PVP) segments are synthesized using a 2‐cyanopropan‐2‐yl N‐methyl‐N‐(pyridin‐4‐yl)dithiocarbamate switchable reversible addition–fragmentation chain transfer (RAFT) agent toward application as kinetic gas hydrate inhibitors (KHIs). Polymerization conditions are optimized to provide water‐soluble block copolymers by first polymerizing more activated monomers such as S and PFS to form a defined macro chain‐transfer agent (linear degree of polymerization with conversion, comparatively low dispersity) followed by chain extensions with less activated monomers VAc or VP by switching to the deprotonated form of the RAFT agent. The critical micelle concentrations of these amphiphilic block copolymers (after VAc unit hydrolysis to vinyl alcohol units) are measured using zeta surface potential measurements to estimate physical behavior once mixed with the hydrates. A PS‐poly(vinyl alcohol) block copolymer improved inhibition to 49% compared to the pure methane–water system with no KHIs. This inhibition was further reduced by 27% by substituting the PS with a more hydrophobic PPFS. A block copolymer of PS–PVP exhibited 20% greater inhibition than the PVP homopolymer and substituting PS with a more hydrophobic PPFS resulted in a 35% further decreased in methane KHI. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2445–2457, 56, 2445–2457

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Poly(styrene/pentafluorostyrene)‐block‐poly(vinyl alcohol/vinylpyrrolidone) amphiphilic block copolymers for kinetic gas hydrate inhibitors: Synthesis, micellization behavior, and methane hydrate kinetic inhibition

Rajput

Colantuoni

Bayahya

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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“…To determine the critical micelle concentration (CMC) of four kinds of surfactants, a curve fi tting method was employed to fi nd the intersection point of the two lines [5]. In order to minimize error, every four points that on both sides of the fi nal low point were chosen to fi tting a straight lines separately, and the corresponding concentration of intersection point was the critical micelle concentration.…”

Section: Research Of Cmc Valuesmentioning

confidence: 99%

“…The use of surface active materials based fracturing fluids in the pay zone offers significant advantages over traditional fracturing fl uids, especially due to their non-damaging effects on the reservoir [4]. It is well known that under a critical concentration (CMC), the surfactant is dispersed mostly in monomers, and above that concentration, however, the surfactant would form micelles in solution [5]. These micelles can provide suffi cient viscosity for fracturing of formation without the use of polymer additives [6].…”

Section: Introductionmentioning

confidence: 99%

Introducing hydroxyl into cationic surfactants as viscoelastic surfactant fracturing fluid with high temperature resistance

Zhu

Dai

et al. 2016

Russ J Appl Chem

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The viscoelastic surfactant (VES) fracturing fl uid is new fracturing system, which is primarily made up of viscoelastic surfactant and some other auxiliaries. The traditional VES fracturing fl uid has the obvious advantages in gel breaking, fl owing back, carrying sands, etc. However, they are centered largely in the aspects of medium and low temperature system. In this paper, the work is focus on the need for the VES fracturing fl uid with high temperature resistance. In the experiment, four kinds of viscoelastic surfactants with hydroxyl were fi rstly synthesized, which were named C 14 -1, C 16 -1, C 14 -2 and C 16 -2 respectively. Then the formulation of VES fracturing fl uid was determined in accordance with the apparent viscosity of solution, and the formulation was that concentration of C 16 -2 and NaSal were 2.5% and 1% respectively. It was found that the VES fracturing fl uid has excellent effectiveness via testing properties of temperature resistance, shear stability, sand-carrying and gel breaking. When the temperature of system was 144°C, the apparent viscosity of the VES fracturing fl uid was 25 mPa s, which could demand the requirements of carrying sands as well as support agents, and it could resist high temperature well. It is also observed that the VES fracturing fl uid is the pseudoplastic fl uid, which contributes to getting the cracks with excellent negotiability.

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Accurate and sensitive probing of onset of micellization based on absolute aggregation‐caused quenching effect

Liu

Jiang

et al. 2022

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Probing the onset of micellization, or determining the critical micelle concentration (CMC), is of crucial importance while remains to be challenged by growing demand for extraordinary sensitivity and accuracy. Although fluorometry has attracted wide attention owing to its superiority in simplicity and sensitivity over other methods, the presence and fluctuation of background fluorescence of conventional fluorescent probes undermine the accuracy of CMC determination. Herein, a series of novel fluorescent probes without background fluorescence at a concentration below CMC owing to absolute aggregation‐caused quenching (aACQ) are utilized for sensitive and accurate measurement of CMC. The aACQ probes aggregate spontaneously and instantly in an aqueous environment owing to molecular π–π stacking with fluorescence quenching absolutely. Therefore, the absence of background fluorescence at a concentration below CMC clears relevant interference associated with conventional fluorophores. In this study, the new method is applied for versatile surfactants with CMCs ranging from nanomolar to millimolar concentrations, especially copolymers with ultralow CMC. The higher sensitivity and accuracy are highlighted by comparison with conventional probes.

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An induction current method for determining the critical micelle concentration and the polarity of surfactants

Cited by 18 publications

References 50 publications

Poly(styrene/pentafluorostyrene)‐block‐poly(vinyl alcohol/vinylpyrrolidone) amphiphilic block copolymers for kinetic gas hydrate inhibitors: Synthesis, micellization behavior, and methane hydrate kinetic inhibition

Poly(styrene/pentafluorostyrene)‐block‐poly(vinyl alcohol/vinylpyrrolidone) amphiphilic block copolymers for kinetic gas hydrate inhibitors: Synthesis, micellization behavior, and methane hydrate kinetic inhibition

Introducing hydroxyl into cationic surfactants as viscoelastic surfactant fracturing fluid with high temperature resistance

Accurate and sensitive probing of onset of micellization based on absolute aggregation‐caused quenching effect

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