Urea effect on aggregation and adsorption of sodium dioctylsulfosuccinate in water

Thapa, Uttam; Ismail, K.

doi:10.1016/j.jcis.2013.06.009

Cited by 19 publications

(16 citation statements)

References 50 publications

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“…Solvato-fluorochromic molecules have been used to detect changes in environmental polarity [33]. Pyrene is a fluorochromic dye commonly used to detect the hydrophobic micelle core environment [34]. The fluorochromic properties of pyrene change slightly when the dye is entrapped in a nonpolar environment.…”

Section: Discussionmentioning

confidence: 99%

Polymer Nanoassemblies With solvato- and halo-fluorochromism for Drug Release Monitoring and Metastasis Imaging

2015

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Background: Theranostics, an emerging technique that combines therapeutic and diagnostic modalities for various diseases, holds promise to detect cancer in early stages, eradicate metastatic tumors and ultimately reduce cancer mortality. Methods & results:This study reports unique polymer nanoassemblies that increase fluorescence intensity upon addition of hydrophobic drugs and either increase or decrease fluorescence intensity in acidic environments, depending on nanoparticle core environment properties. Extensive spectroscopic analyses were performed to determine optimal excitation and emission wavelengths, which enabled real time measurement of drugs releasing from the nanoassemblies and ex vivo imaging of acidic liver metastatic tumors from mice. Conclusion: Polymer nanoassemblies with solvato-and halo-fluorochromic properties are promising platforms to develop novel theranostic tools for the detection and treatment of metastatic tumors.

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Section: Discussionmentioning

confidence: 99%

Polymer Nanoassemblies With solvato- and halo-fluorochromism for Drug Release Monitoring and Metastasis Imaging

2015

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“…Urea inhibits aggregation of surfactant molecules, as documented by the critical micelle concentration (cmc) increase, micelle hydrodynamic size and aggregation number decrease of dioctylsuccinate [4], sodium dodecyl sulfate, cetylpyridinium bromide and cetyltrimethylammonium bromide micelles [5][6][7]. The addition of urea slightly decreases the micropolarity and strongly increases the microviscosity of the micellar interface of sodium dodecylbenzenesulfonate micelles indicating a possible replacement of some water molecules by urea [8].…”

Section: Introductionmentioning

confidence: 99%

Urea-based gemini surfactants: Synthesis, aggregation behaviour and biological activity

Pisárčik

Pupák

Devı́nsky

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Both the c min for KPFOS and NaPFOS decreased in the presence of urea. The surface tension of aqueous urea solution is reported to be slightly higher than that of pure water [34]. Therefore, the decrease in c min for KPFOS and NaPFOS at 25°C by adding urea should be attributed to the increased solubility, which provided more surfactant molecules in the bulk phase to give smaller c min .…”

Section: Resultsmentioning

confidence: 97%

Hydrotrope‐Induced Enhancement of Room Temperature Surface Activity for High Krafft Point Fluorinated Surfactants

Zhou

Xing

et al. 2016

J Surfact & Detergents

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Potassium perfluorooctane sulfonate (KPFOS) and sodium perfluorooctane sulfonate (NaPFOS) exhibit poor surface activities in aqueous solution at room temperature because of their high Krafft points. In this work, we attempted to increase the solubility of KPFOS and NaPFOS and consequently improve their surface activities at room temperature with sodium p‐methylbenzene sulfonate (BS) and urea, which are typical hydrotropes in industrial applications. The effects of BS and urea on the surface tension of the aqueous solutions of KPFOS and NaPFOS were investigated at 25 °C. When the hydrotropes were added, the effectiveness of KPFOS and NaPFOS in surface tension reduction was greatly enhanced and KPFOS showed higher efficiency in surface tension reduction than NaPFOS. On the other hand, BS had much stronger ability than urea to reduce the surface tension of KPFOS and NaPFOS in water. In particular, with the assistance of BS the minimum surface tension of KPFOS approached 19 mN/m at 25 °C. It was worth noting that in the presence of BS, the surface tension of an apparently “saturated” solution (i.e., with coexisting surfactant solid) continuously decreased with increasing surfactant concentration. This behavior was ascribed to enrichment of branched PFOS isomers in aqueous phase with the assistance of BS, as evidenced by high‐resolution 19F NMR. Hydrotropes were able to recover the inherent character of KPFOS and NaPFOS as highly surface‐active fluorinated surfactants by increasing the solubility of branched isomers. This is an easy way to enhance the effectiveness in surface tension reduction at room temperature for fluorinated surfactants with high Krafft points.

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Urea effect on aggregation and adsorption of sodium dioctylsulfosuccinate in water

Cited by 19 publications

References 50 publications

Polymer Nanoassemblies With solvato- and halo-fluorochromism for Drug Release Monitoring and Metastasis Imaging

Polymer Nanoassemblies With solvato- and halo-fluorochromism for Drug Release Monitoring and Metastasis Imaging

Urea-based gemini surfactants: Synthesis, aggregation behaviour and biological activity

Hydrotrope‐Induced Enhancement of Room Temperature Surface Activity for High Krafft Point Fluorinated Surfactants

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