Critical micelle concentrations (cmcs) of sodium deoxycholate (SDC) were determined at 25 °C in water + ethylene glycol (EG) medium (mass fraction of EG, wEG × 102 = 0, 10, 20, 30, 40, 50, …Web
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The interest in the determination of critical micelle concentrations (CMC) has been growing for decades. The measurement of CMC is fundamental in many fields because surfactants are widely used in biology, pharmaceutical chemistry, and materials science. The properties and characteristics of surfactants, including CMC determination …Web
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Xuefeng, L. et al. Correlation of critical micelle concentration of sodium alkyl benzenesulfonates with molecular descriptors. Wuhan Univ. J. Nat. Sci. 11, 409–414 (2006). Article Google ScholarWeb
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A series of monodispersed (PDI <0.05) butyl acrylate emulsions with different sizes (100–500 nm) and solid contents (22, 17, 12 and 7 wt%) were prepared using a semibatch seeded emulsion polymerization method. Sodium dodecyl sulfate (SDS) was used as an emulsifier and potassium persulfate as an initiator. Surface tensions of the …Web
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Abstract. The critical micelle concentration (CMC) is an important parameter of widely used surfactants and needs to be measured in the application and development …Web
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CMC values for four commonly employed anionic surfactants were determined - sodium dodecyl sulfate: 8.1 mM; sodium caprylate- 300 mM; sodium …Web
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Anionic surfactant was investigated in magnetic water medium using conductometric technique. The critical micelle concentration (CMC) was determined both in absence and presence of different concentration percentages of short alcohol chains in a temperature range (293.15–308.15K). The thermodynamic parameters (∆Gom, ∆H o m, …Web
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The sodium counterion was studied as well. Results showed that when the length of the coun-terion methylene chain was increased, the surfactants' critical micelle concentrations (CMC) decreased. This decrease was attributed to diamines with longer methylene chains binding to multiple surfactantWeb
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The electrical conductivity of lithium dodecylsulfate, sodium dodecylsulfate, sodium oleate and sodium stearate has been determined in molten acetamide at 90°C. Conductivity measurements show that for these surfactants, micelles are formed in molten acetamide solutions. The critical micelle concentration (CMC) of each surfactant has …Web
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Sodium dodecyl sulfate (SDS) 32: 0.1 ... The monomer concentration increases until the critical micelle concentration (CMC) above which an equilibrium is established between …Web
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The concentration of amphiphile at which this occurs is the critical micelle concentration (CMC). Figure (PageIndex{5}) shows a graph of monomeric single chain amphiphile in solution versus the concentration added to the solution. Figure (PageIndex{5}): Monomeric single chain amphiphile in solution versus the …Web
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ABSTRACT: Critical micelle concentration (CMC) is the main chemical−physical parameter to be determined for pure surfactants ... (sodium dodecyl sulfate, sodium deoxycolate, and N-lauroyl sarcosinate) and two nonionic, such as polyethylene glycol ester surfactants [polyethylenglicol (8) monostearate andWeb
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concentration of a monomer at which micelles form is called critical micelle concentration (CMC). The stability of micelles is related to their CMC value: the lower the CMC value of a given surfactant, the more stable the micelles (5) (Table 1). In dissolution testing, the micelle of surfac-tant molecules mimics the bile acid aggregates in theWeb
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thanks a lot...but I got around 1 x 10 -3 Mol L -1. So I think, the CMC depends on the purity also. For soaps like oleate cmc also depends on pH. Except high pH part of the oleate is converted to ...Web
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below the micelle concentration result in a polar environment indicative of a high peak 1 to peak 3 ratio. As surfactant concentrations increase and approach the CMC, the pyrene 1:3 ratio begins to decrease rapidly to reaching a new lower constant value that reflect the 1:3 ratio at surfactant concentrations above the CMC [9].Web
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Critical micelle concentration (CMC) is one of the main physico-chemical properties of surface-active agents, also known as surfactants, with diverse theoretical …Web
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The critical micelle concentrations of sodium decyl and lauryl sulfates at 25 deg have been determined from precise conductance data in water and in heavy water. The critical concentrations in heavy water are slightly lower. The solubility of sodium lauryl sulfate at 9 deg C is also only about 5% lower in heavy water.Web
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@article{osti_7007194, title = {Critical micelle concentration behavior of sodium taurocholate in water}, author = {Meyerhoffer, S M and McGown, L B}, abstractNote = {Fluorescent probes representing a wide range of aqueous solubility, including fluorescein isothiocyanate and four polycyclic aromatic hydrocarbon (PAH) compounds, were used …Web
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The critical micelle concentration (CMC) is a parameter that describes the concentration at which surfactants begin to form micelles. Beyond this concentration, an increasing …Web
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The solutions at concentrations far above the lowest became turbid within 20 min during its standing at 298.15 K in the water thermostat after ... miscibility has been compared between the adsorbed film and micelle by the use of the phase diagrams of adsorption and micelle formation. Sodium chloride and SDS are immiscible in the …Web
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Abstract By conductivity method were examined the aggregation behavior of cationic amphiphile–cetyltrimethylammonium bromide (CTAB) and anionic amphiphile–sodium dodecyl sulfate (SDS) mixtures in binary mixtures of various salts. The values of critical micelle concentration (cmc) of SDS–CTAB mixtures lie between the …Web
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The critical micelle concentration (CMC) of Sodium Dodecyl Sulfate (SDS) in water was determined from the conductance and viscosity measurements. The conductance and viscosity data of SDS have been reported (Lide, 1992, Motin et al., 2011). The estimated value of CMC was found to be 0.0085 mol L −1 at 29 °C. The …Web
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Critical micelle concentrations (CMC) were determined at 30°C for aqueous sodium dodecyl sulfate (SDS)-bivalent metal dodecyl sulfate [M (DS) 2] mixtures over the entire surfactant composition range.Bivalent metals used were Mg 2+, Mn 2+, Co 2+, Ni 2+, and Cu 2+.The CMC of surfactant mixtures decreased rapidly with the increase of M …Web
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The concentration ranges investigated with SNAC were higher than with C 10 due to differences in the signal amplitude between the two PEs; unlike C 10, SNAC concentrations were all above its CMC in water. These observations are consistent with the hypothesis that SNAC molecules form micelle-like clusters upon binding to exenatide.Web
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Thermodynamic interference impairs breakdown of simple bile salt micelles. Our studies started with the sodium salt of the trihydroxy BA, cholic acid, i.e. sodium taurocholate (STC), since cholic ...Web
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The presented study is devoted to the investigation of the micellization-induced liquid-liquid fluctuations in sodium decanoate (NaD) aqueous solutions, based on the vibrational spectroscopic study of NaD and the determination of critical micelle concentration (CMC) of this system.Web
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Analogous to the micelle concept for dispersed emulsions of non-mixing substances 23,24, the salt is insoluble in the diluent in a LHCE, while the diluent is miscible with the solvent 7.A ternary ...Web
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The approach is demonstrated for sodium laureth sulfate (SLES) surfactants with polydispersity in the ethoxylate spacer. For this system, we find a modest degree of cooperativity in micelle formation, which we attribute to the reduced repulsion between …Web
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In the present article, the critical micelle concentration (CMC) of cetyltrimethylammonium bromide (CTAB, cationic), sodium lauryl sulphate (SLS, anionic) and tween 80 (nonionic) surfactants has been studied in the presence and absence of methylene blue () dye via spectral and conductometric studies.Web
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Critical micelle concentrations (cmc) of sodium dodecyl sulfate (SDS) in the presence of sodium chloride, sodium acetate, sodium propionate and sodium butyrate were measured by surface tension (at 20, 25 and 30 °C), conductance (at 25 °C) and EMF (at 25 °C) methods.Values of surface excess, counter ion binding constant, surface area, …Web
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The specific conductivity (μS/cm) of surfactant solutions (SDS, NaDC, SDDS) in water was measured at 25 °C using a MicroCM 2200 conductimeter (Crison, Spain). …Web
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There was no contribution of the empty micelle concentration beyond its contribution to the sodium ion concentration. We conclude that the solute exchange involves spontaneous fragmentation of the SDS micelles into two submicelles, each bearing a molecule of 1, which then grow back to normal micelles through condensation of SDS monomers. We ...Web
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The effect of surfactant concentration on the shape and size of their micelles has been extensively reported for anionic, cationic and zwitterionic surfactants using small angle X-ray and neutron scattering …Web
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Sodium N-dodecanoyl sarcosinate (SDDS), an amino acid-based surfactant, has been studied in the presence of salts of higher valencies; critical micelle concentration (CMC) of SDDS; CMC was found to decrease with increasing salt concentration; physicochemical parameters, counterion binding of micelles (β), diffusion coefficient (D …Web
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Actually, the presence of two charged groups for each AOT molecule (sulfonic group and sodium ion) is most certainly responsible, at W < 10, for trapping all water as hydration water in compact shells, ... In colloidal and surface chemistry, the critical micelle concentration is defined as the concentration above which micelles form. At low ...Web
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Critical micelle concentration determination of sodium dodecyl sulfate via samples prepared by method II. With the above optimized conditions for CMC determination using pyrene as probe, a series of samples with different concentrations of SDS and 2 ml of pyrene-saturated water solution were prepared by method II and measured by a ...Web
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