The photophysical determination of the minimum hydrotrope concentration of aromatic hydrotropes

Neumann, Miguel G.; Cavalheiro, Carla Cristina Schmitt; Prieto, Kátia R.; Goi, Beatriz E.

doi:10.1016/j.jcis.2007.07.020

Cited by 43 publications

(41 citation statements)

References 14 publications

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“…This method was widely described in the paper (Neumann et al, 2007). The measurement of the I(aggregate)/I(monomolecular) results in a good insight into the evolution of the aggregate formation in the solution when the hydrotropic concentration increases.…”

Section: Fluorescence Studiesmentioning

confidence: 99%

“…MHC is determined by measuring the effect of hydrotrope concentration on the chemical properties of solutions, such as solubility enhancement or increase in hydrolysis reaction rates. Some physical properties of hydrotrope solutions also show discontinuities when the hydrotrope changes from its monomolecular form to aggregates (Neumann et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Radiolysis of sodium p-cumenesulfonate in aqueous solution

Osiewała

Socha

Wolszczak

et al. 2013

Radiation Physics and Chemistry

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Section: Fluorescence Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiolysis of sodium p-cumenesulfonate in aqueous solution

Osiewała

Socha

Wolszczak

et al. 2013

Radiation Physics and Chemistry

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“…The drawback however of using dyes has always been the effect of the dye molecule on the aggregate. Neumann et al 26 carried out fluorescence measurements with aromatic hydrotropes (i.e. without the use of dyes).…”

Section: Hydrotope Actionmentioning

confidence: 99%

Action of hydrotropes and alkyl-hydrotropes

2011

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Hydrotropes are small molecule amphiphiles, having considerable industrial importance as agents for solubilization of hydrophobic substances in aqueous systems. The physico-chemical origin and mechanism of hydrotrope action has been a subject of academic debate and controversy for many years. One important issue is how close the solution physical chemistry of hydrotropes resembles that of common surfactants. This article seeks to improve the appreciation of this field by comparing thermodynamic, phase, spectroscopic and scattering studies of hydrotrope aqueous solutions. In addition, alkyl-hydrotropes are discussed, which represent a structural evolution from classic hydrotropes towards common surfactants, having solution properties more reminiscent of surfactants.

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“…Fine-Chem Ltd. (Mumbai) with a manufacturer's stated purity of 99%. The hydrotrope potassium p-toluene sulfonate was prepared in the laboratory using the established method of sulfonation of aromatic hydrocarbon (Mamta Agarwal and Gaikar, 1992;Neumann et al, 2007).…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Enhancement of Solubility and Mass-Transfer Coefficient of 1,2-Dihydroxy-9,10-Anthraquinone (Alizarin) Through Hydrotropy

Prakash¹,

Kumar

Gandhi

2009

Chemical Engineering Communications

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The effect of hydrotropes potassium p-toluene sulfonate (KPTS), citric acid, and nicotinamide on the solubility and mass-transfer coefficient of 1,2-dihydroxy-9,10-anthraquinone (alizarin) was studied. Solubility studies were carried out under a wide range of hydrotrope concentrations (0 to 3.0 mol Á L À1 ) and different system temperatures (303 to 333 K). It was observed that the solubility and mass-transfer coefficient of alizarin increases with an increase in hydrotrope concentration and system temperature. The maximum enhancement factor, the ratio of the value of solubility in the presence and absence of a hydrotrope, was determined for all experiments under study. The effectivity of hydrotropes was measured by the determination of the Setschenow constant, K s . The order of effectiveness of various hydrotropes based on K s values is potassium p-toluene sulfonate > citric acid > nicotinamide.

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The photophysical determination of the minimum hydrotrope concentration of aromatic hydrotropes

Cited by 43 publications

References 14 publications

Radiolysis of sodium p-cumenesulfonate in aqueous solution

Radiolysis of sodium p-cumenesulfonate in aqueous solution

Action of hydrotropes and alkyl-hydrotropes

Enhancement of Solubility and Mass-Transfer Coefficient of 1,2-Dihydroxy-9,10-Anthraquinone (Alizarin) Through Hydrotropy

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