Thermodynamics and Micellar Properties of Tetradecyltrimethylammonium Bromide in Formamide–Water Mixtures

Aguiar, J. Albino

doi:10.1006/jcis.2002.8678

Cited by 102 publications

(51 citation statements)

References 35 publications

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“…Additions of electrolyte and associated counter ion largely moderate micellization of ionic surfactants [25][26][27], due to decrease in electrostatic repulsion between the charge head group, which induced a decrease in CMC.…”

Section: Introductionmentioning

confidence: 99%

Conductometric Studies on the Effect of Temperature and Tetramethylammonium Bromide Salt on the Micellization of Cetyltrimethylammonium Bromide in Aqueous Medium

Esan

Olubunmi²,

Olumuyiwa³

et al. 2015

Int. J. Thermo

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Section: Introductionmentioning

confidence: 99%

Conductometric Studies on the Effect of Temperature and Tetramethylammonium Bromide Salt on the Micellization of Cetyltrimethylammonium Bromide in Aqueous Medium

Esan

Olubunmi²,

Olumuyiwa³

et al. 2015

Int. J. Thermo

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“…The slope of the compensation plot (ΔH°vs. ΔS°) provides information on solute-solute and solute-solvent interactions as a measure of the "solvation part" of the micellization process, and the intercept gives information on solute-solute interactions as an index of the effectiveness of the "chemical part" of the micelle formation [40,41]. If both the "solvation part" and the "chemical part" of the micellization process are the same, the ΔH°/ΔS°values fall on a straight line [42].…”

Section: Thermodynamics Of Micellizationmentioning

confidence: 98%

“…5) at a constant ratio ΔH°/ΔS°. This ratio is known as enthalpy-entropy compensation [9,[39][40][41][42]. According to Lumry and Rajender, the micellization process consists of two parts, the "solvation part" and the "chemical part" [39][40][41].…”

Section: Thermodynamics Of Micellizationmentioning

confidence: 99%

Micellization of polyoxyethylene–polyoxypropylene block copolymers in aqueous polyol solutions

Kaizu

Alexandridis

2015

Journal of Molecular Liquids

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The micellization of a representative polyoxyethylene-polyoxypropylene-polyoxyethylene (POE-POP-POE) amphiphilic block copolymer (Pluronic P105, EO 37 PO 58 EO 37 ) in aqueous solutions of the common excipients glucose, glycerol or ethanol, has been investigated as a function of solute (solvent) concentration, block copolymer concentration, and temperature. The formation of POE-POP-POE micelles is favored in the presence of glucose or glycerol, while ethanol has the opposite effect. ΔH°and ΔS°values derived from analysis of critical micellization concentration (CMC) data are both positive in all mixed aqueous polyol systems. ΔH°and ΔS°d ecrease slightly with increasing glucose or glycerol content, but increase significantly in the presence of ethanol.A 10-to 100-fold increase of the amphiphilic block copolymer solution viscosity was observed in the presence of glucose or glycerol above a certain temperature. This viscosity increase is indicative of micelle shape changes from spherical to elongated. The CMC and viscosity changes caused by glucose and glycerol are attributed to the enhanced dehydration of the POE block of the polymeric amphiphile. Glucose is more effective than glycerol, apparently due to its higher hydration number.

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“…Ammonium gemini surfactants show higherv alues ranging between 1.21 and 1.35. [53,54,67] This means that the presence of af lat pyridinium ring as the head group instead of trimethylammonium can better help to accommodate and dehydrate the pyrene probe.…”

Section: Introductionmentioning

confidence: 98%

“…This parameter can also allow us to evaluate how close the polar head groups are to each other,t hat is, the micelle surface compactness. [10,48,[52][53][54] In addition, the presence of ad elocalized chargei np yridinium surfactants positivelyi nfluences the aggregation properties and the DNA transfection activity.T he DNA complexation and its releasei nt he cell are also mediated by the optimal interaction of the cationic vector with the negative charges of the DNA phosphate group. [12] Ah ead group with ad elocalized positive chargei sasofter ion than the ammonium one and thus should interact better with ar easonably soft anion such as the phosphate that is presentinD NA.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Physicochemical Characterization, and Interaction with DNA of Long‐Alkyl‐Chain Gemini Pyridinium Surfactants

et al. 2015

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Pyridinium gemini surfactants with hexadecyl chains linked to nitrogen atoms and a tuned aliphatic spacer that bridges the two pyridinium polar heads in 2,2′‐positions have been synthesized and characterized. A multitechnique approach allowed us to study the aggregation behavior, using conductivity, surface tension, and fluorescence. Graphs of the specific conductivity (κ) versus the surfactant molar concentration (C), and graphs of the molar conductivity (Λ) versus C0.5 suggest pre‐aggregation phenomena of these amphiphiles at very low concentration. The trends of Amin as a function of the spacer length confirm the hypothesis of a conformational change of the molecule with four methylene groups as spacer owing to stacking interactions between the two pyridinium rings mediated by the counterion. Moreover, the trends of Amin and counterion binding (β) suggest that the spacer must be longer than eight carbon atoms to fold efficiently toward the micellar core. The opportunity to tune the surfactant structure and aggregation properties make those surfactants—particularly the long‐chain ones for which the DNA complexing ability was shown by means of atomic force microscopy (AFM) imaging—desirable candidates for gene‐delivery experiments.

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Thermodynamics and Micellar Properties of Tetradecyltrimethylammonium Bromide in Formamide–Water Mixtures

Cited by 102 publications

References 35 publications

Conductometric Studies on the Effect of Temperature and Tetramethylammonium Bromide Salt on the Micellization of Cetyltrimethylammonium Bromide in Aqueous Medium

Conductometric Studies on the Effect of Temperature and Tetramethylammonium Bromide Salt on the Micellization of Cetyltrimethylammonium Bromide in Aqueous Medium

Micellization of polyoxyethylene–polyoxypropylene block copolymers in aqueous polyol solutions

Synthesis, Physicochemical Characterization, and Interaction with DNA of Long‐Alkyl‐Chain Gemini Pyridinium Surfactants

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