The aggregation ofn-dodecanephosphonic acid in water

Minardi, R. M.; Schulz, Pablo C.; Vuano, B. M.

doi:10.1007/bf00658374

Cited by 11 publications

(13 citation statements)

References 10 publications

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“…This would produce a drop in the apparent acidity constant (K a1 ) and an increase of pK a1 when the size of the aggregates grows. This has already been observed in aqueous n-dodecanephosphonic acid systems, 12 where the pK a1 varies from 4.03 in non-micellized molecules to about 6 in micelles and 6.74 in lamellar mesophases. Moreover, the approaching between polar head groups produces an increase in the Stern layer surface potential, which in turn causes a reduction in the micelle ionization degree.…”

Section: ■ Experimental Sectionsupporting

confidence: 63%

“…This was verified using ion-selective electrodes in micelles of dodecanephosphonic acid. 12 The reduction in [H 3 O + ] at higher DPA concentration is caused by the formation of a lamellar mesophase with lower ionization. The reason for the subsequent decrease is that, when the aggregates grow to form multilamellar vesicles or an emulsified lamellar mesophase, much of the added surfactant is enclosed inside the aggregates and cannot contribute to the formation of hydrogen ions.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The same behavior, corresponding to equilibrium between the aggregates and free species, has been previously reported for ndodecane phosphonic acid micelles and lamellar liquid crystal performed with ion-selective electrodes. 12 The shape evolution of the aggregates can be described by their principal moments of inertia (Figure 4 in the Supporting Information). Small, nearly spherical aggregates have similar moments of inertia along the three principal axes.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Intermediate Structures for Higher Level Arrangements: Catching Disk-Like Micelles in Decane Phosphonic Acid Aqueous Solutions

et al. 2013

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It has been proposed that disk-like micelles may be precursors to the formation of lamellar liquid crystals. The possibility of obtaining n-decane phosphonic acid (DPA) disk-like micelles in aqueous solution without the addition of a second ionic surfactant led us to study in detail the low-concentration range of this system by both a battery of experimental techniques and molecular dynamics (MD) simulations. The experimental results indicate that premicelles with some capacity to solubilize dyes are formed at 0.05 mM. The critical micelle concentration (cmc) was found to be 0.260 ± 0.023 mM, much lower than that previously reported in the literature. Spherical micelles, which immediately grow, leading to disk-like micelles, are probably formed at this concentration. At 0.454 ± 0.066 mM, disk-like micelles become unstable, giving rise to the formation of an emulsion of lamellar mesophase that dominates the system beyond 0.670 ± 0.045 mM. These experimental results were corroborated by MD simulations which, additionally, allow describing the structure of the obtained micelles at atomic level. The analysis of the MD trajectories revealed the presence of strong intermolecular hydrogen bonds between the surfactant headgroups, producing a compact polar layer with low water content. The formation of such H-bond network could explain the ability of this surfactant to form disk-like micelles at concentrations close to the cmc.

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Section: ■ Experimental Sectionsupporting

confidence: 63%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Intermediate Structures for Higher Level Arrangements: Catching Disk-Like Micelles in Decane Phosphonic Acid Aqueous Solutions

et al. 2013

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“…The same behaviour was observed in sodium dehydrocholate micelar solutions [12]. However, in some anionic surfactants, such as SDS [9] sodium perfluorooctanoate [13], and n-alkane phosphonic acids [14,15] [16].…”

Section: Polarographic and Voltammetric Methods Applied To Surfactantsupporting

confidence: 65%

Electrochemistry of Surfactants

Schulz¹,

Schulz²,

CarlosSchulz³

2017

Application and Characterization of Surfactants

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“…Moreover, zwitterionic surfactants have lower critical micelle concentration (CMC) than anionic, cationic or nonionic ones. For example, the CMCs of CTAB, DBSA, and N-Dodecylphosphonic acid, determined in water at room temperature are 0.90, 0.55, and 0.54 mM/L, respectively. − The CMC of sulfobetaine surfactant SB3C16 is 0.02 mM/L . It is very important parameter, because nanoparticles are formed at a concentration of surfactant above its critical value.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Sulfobetaine-Stabilized Cu₂O Nanoparticles and Their Biomedical Potential

Woźniak-Budych

Przysiecka

Maciejewska

et al. 2017

ACS Biomater. Sci. Eng.

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A novel approach using a zwitterionic sulfobetaine-based surfactant for the synthesis of spherical copper oxide nanoparticles (Cu2O NPs) has been applied. For the first time, N-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate has been used as stabilizer to control the size and morphology of Cu2O NPs. Several techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), and fluorescence spectroscopy, are used to investigate the size, structure, and optical properties of synthesized Cu2O nanocrystals. The results indicate that copper(I) oxide nanoparticles with size in the range of 2 to 45 nm and crystalline structure, exhibit intense yellow fluorescence (λem = 575 nm). Furthermore, the cytotoxicity studies show that sulfobetaine-stabilized copper oxide nanoparticles prompt inhibition of cancer cell proliferation in a concentration-dependent manner, however, the adverse effect on the normal cells has also been observed. The results indicate that the sulfobetaine-stabilized Cu2O, because of their unique properties, have a potential to be applied in medical fields, such as cancer therapy and bioimaging.

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The aggregation ofn-dodecanephosphonic acid in water

Cited by 11 publications

References 10 publications

Intermediate Structures for Higher Level Arrangements: Catching Disk-Like Micelles in Decane Phosphonic Acid Aqueous Solutions

Intermediate Structures for Higher Level Arrangements: Catching Disk-Like Micelles in Decane Phosphonic Acid Aqueous Solutions

Electrochemistry of Surfactants

Facile Synthesis of Sulfobetaine-Stabilized Cu₂O Nanoparticles and Their Biomedical Potential

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The aggregation ofn-dodecanephosphonic acid in water

Cited by 11 publications

References 10 publications

Intermediate Structures for Higher Level Arrangements: Catching Disk-Like Micelles in Decane Phosphonic Acid Aqueous Solutions

Intermediate Structures for Higher Level Arrangements: Catching Disk-Like Micelles in Decane Phosphonic Acid Aqueous Solutions

Electrochemistry of Surfactants

Facile Synthesis of Sulfobetaine-Stabilized Cu2O Nanoparticles and Their Biomedical Potential

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Product

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Facile Synthesis of Sulfobetaine-Stabilized Cu₂O Nanoparticles and Their Biomedical Potential