Basicity of dodecyltrimethylammonium hydroxide

Morini, Marcela A.; Minardi, R. M.; Schulz, Pablo C.; Puig, J. E.; Hernández-Vargas, María E.

doi:10.1016/0927-7757(95)03148-7

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…The same behaviour of α was observed in amiodarone micelles [8]. In cationic surfactants [S] strongly decreases and counterions concentration [X] monotonically increases at concentrations above the CMC [9][10][11]. The same behaviour was observed in sodium dehydrocholate micelar solutions [12].…”

Section: Polarographic and Voltammetric Methods Applied To Surfactantsupporting

confidence: 59%

Electrochemistry of Surfactants

Schulz¹,

Schulz²,

CarlosSchulz³

2017

Application and Characterization of Surfactants

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Section: Polarographic and Voltammetric Methods Applied To Surfactantsupporting

confidence: 59%

Electrochemistry of Surfactants

Schulz¹,

Schulz²,

CarlosSchulz³

2017

Application and Characterization of Surfactants

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“…Water used in all prepared solutions refers to Milli-Q water with a conductivity of 18 MΩ cm –1 . Didodecyldimethylammonium hydroxide (DDAOH) was prepared using previously reported methods. ,,, The successful conversion of bromide to hydroxide was verified using electrospray ionization mass spectrometry analysis to confirm the absence of the bromide ion and (DDA + ) n +1 OH n clusters.…”

Section: Methodsmentioning

confidence: 99%

Self-Assembly of Didodecyldimethylammonium Surfactants Modulated by Multivalent, Hydrolyzable Counterions

Liu

Warr

2014

Langmuir

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The self-assembly behavior of double-chained didodecyldimethylammonium (DDA(+)) surfactants with hydrolyzable phosphate (PO4(3-), HPO4(2-), and H2PO4(-)), oxalate (HC2O4(-) and C2O4(2-)), and carbonate (HCO3(-)/CO3(2-)) counterions was found to depend on both the counterion and its hydrolysis state, as determined by the pH of the system. Carbonate and phosphate ions at all hydrolysis states successfully stabilize an extended isotropic micellar solution region. These micelles are well-described as prolate ellipsoids which vary in size and aspect ratio depending on the surfactant concentration and hydrolysis state of the counterion. Both oxalate counterions form bilayer structures in dilute solution. The structures found with divalent oxalate, C2O4(2-), ions possessed very limited swelling capacity compared to the bilayer structures formed with monovalent oxalate, HC2O4(-), ions. The lamellar (Lα) phase was universally formed at sufficiently high surfactant concentrations for all hydrolyzable counterions. Two intermediate structures corresponding to a disordered mesh (Lα(D)) and tetragonal ordered mesh (T) phase were found to form with DDA2HPO4 prior to the Lα phase but not with other phosphate counterions.

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“…Elsewhere we measured the pK b of DTAOH (¼ 2.89), which gives a pK a of 11.1. 53 Assuming that the pK a of CTAOH is similar, we have that the isoelectric point with H 2 PO 4…”

Section: àmentioning

confidence: 99%

“…Also, there is a tendency for the accumulation of OH À ions at the cationic micellar surface, in competence with other counterions-this fact is used in micellar catalysis. 53 Hence, the counterions, which are weak acid groups and are in the Stern layer, encounter a more basic environment than that of the intermicellar solution and, as a result, the pH of the micellar solution shifts to higher values compared to that in the surfactant-free salt solution. Hence, we propose that the step behavior observed in the viscosity and relaxation time (Fig.…”

Section: àmentioning

confidence: 99%

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Effect of ionic strength on rheological behavior of polymer-like cetyltrimethylammonium tosylate micellar solutions

et al. 2011

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The influence of ionic strength on the rheological properties of polymer-like aqueous micellar solutions of cetyltrimethylammonium tosylate (CTAT) containing different salts (KCl, KBr, (COONa) 2 , K 2 SO 4 or K 3 PO 4 ) is investigated. The rheological behavior of the solutions is analyzed above the concentration where a micellar entanglement network is formed, varying surfactant and salt concentration, salt counterion valency and temperature. A master curve of the linear viscoelastic properties is obtained by multiple superposition of time, temperature, salt type, and surfactant and salt concentration. Application of the existent kinetic theory provides information suggesting that the micellar solutions are in the fast breaking regime (i.e., the relaxation is kinetically controlled) regardless of salt type and concentration. Moreover, these solutions exhibit shear-banding flow with a reduced stress plateau (s/G 0 , being s and G 0 the shear stress and the plateau modulus, respectively) that increases with salt content and counterion valency. The zero-shear viscosity (h 0 ) and the main relaxation time (s C ) diminish with increasing salt content according to a step-like function, in which the number of steps increases with the salt counterion valence. In contrast, G 0 only increases slightly with increasing salt content for the five salts employed. These results are discussed in terms of ionic strength and screening of the electrostatic-interactions caused by the addition of salt. In addition, it was found that the influence of anions on the viscoelastic properties of the polymer-like micelles follows the Hofmeister series commonly encountered in macromolecular and biological systems. This finding opens a challenge for scientists in the experimental and theoretical fields.

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Basicity of dodecyltrimethylammonium hydroxide

Cited by 9 publications

References 21 publications

Electrochemistry of Surfactants

Electrochemistry of Surfactants

Self-Assembly of Didodecyldimethylammonium Surfactants Modulated by Multivalent, Hydrolyzable Counterions

Effect of ionic strength on rheological behavior of polymer-like cetyltrimethylammonium tosylate micellar solutions

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