Near-infrared spectroscopic method for the sensitive and direct determination of aggregations of surfactants in various media

Tran, Chieu D.; Yu, Shaofang

doi:10.1016/j.jcis.2004.09.031

Cited by 75 publications

(63 citation statements)

References 16 publications

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“…The results demonstrated that the binding constants observed in the RTIL are much lower than those in D 2 O, and this confirms the predominance of external adsorption as the main interaction between phenols and CDs in an IL solvent. An NIR spectroscopic technique also was developed for sensitive and direct determination of critical micelle concentration values of various nonionic surfactants in RTILs (49). The NIR approach appeared to be sensitive, universal, and nonintrusive, and no additives were needed.…”

Section: Spectroscopymentioning

confidence: 99%

Ionic Liquids in Analytical Chemistry

Anderson¹,

Armstrong²,

Wei³

2006

Anal. Chem.

491

326

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oom-temperature ionic liquids (RTILs), also known as liquid organic, molten, or fused salts, are a class of nonmolecular ionic solvents with low melting points. The accepted definition of an RTIL is any salt that has a melting point lower than ambient temperature (1). However, "ionic liquid" (IL) is often applied to any compound that has a melting point <100°C. Most common RTILs are composed of unsymmetrically substituted nitrogen-containing cations (e.g., imidazole, pyrrolidine, pyridine) with inorganic anions (e.g., Cl -, PF 6 -, BF 4 -). ILs are also interesting because of their other useful and intriguing physicochemical properties. Wilkes et al. first reported ambient-temperature ILs based on the 1-alkyl-3-methylimidazolium cation in 1982 (2). Since then, many ILs containing a variety of cations and anions of different sizes have been synthesized to provide specific characteristics.Over the past few years, research and applications of ILs have expanded tremendously. The initial impetuses for this expansion were organic synthesis and the growth of green chemistry. In this article, we will give an overview of the structure and properties of ILs and describe their expanding use in various applications in separations and chromatography, MS, spectroscopy, and electrochemistry. Description and propertiesILs have negligible vapor pressures at room temperature, possess a wide range of viscosities, can be custom-synthesized to be miscible or immiscible, often have high stability, and are capable of un-

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Section: Spectroscopymentioning

confidence: 99%

Ionic Liquids in Analytical Chemistry

Anderson¹,

Armstrong²,

Wei³

2006

Anal. Chem.

491

326

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“…At a concentration above a critical value, i.e., critical micelle concentration (CMC), surfactant molecules tend to aggregate forming micelles. At CMC point, some properties of surfactant solutions like conductivity, surface tension, osmotic pressure, absorption, and fluorescence as a function of concentration suffer abrupt changes due to the micelle formation (Tran & Yu 2005;Van Os et al 1993).…”

Section: Introductionmentioning

confidence: 99%

A new simple method for determining the critical micelle concentration of surfactants using surface plasmon resonance of silver nanoparticles

et al. 2015

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Background: A new and simple determination method for critical micelle concentration (CMC) has been developed based on surface plasmon resonance (SPR) technique. In the current work, the CMCs for sodium dodecyl sulfate (SDS), cetyl trimethyl ammonium bromide (CTAB), and Triton X-100 (TX-100) were determined in aqueous media by SPR of silver nanoparticles (AgNPs). Findings: The variation of the absorbance of AgNPs in respect of bulk water is a consequence of the micelles formation from the surfactants monomer, here, SDS, CTAB, and TX-100. Under the optimal experimental conditions, CMCs for SDS, CTAB, and TX-100 using SPR technique were 8.6 × 10

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“…The anionic surfactant sodium dodecylsulfate (SDS) does not appear to be solubilized within emimTf 2 N at ambient conditions [24]. Moreover, Tran and Yu have reported that nonionic surfactants N-dodecylsultaine (SB-12), caprylyl sulfobetaine (SB3-10) formed micelles in bmimPF 6 and emimTf 2 N [25]. So far, it seems that nonionic surfactants are more inclined to support the micellar aggregations in ILs.…”

Section: Self-assembled Micelles In Ilsmentioning

confidence: 99%