Dissolution Rates of Surfactants

Miller, Clarence A.

doi:10.1007/12_2008_160

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…As shown in Figure 4, the appearance of the filaments strongly resembles that of the myelin figures which form when lyotropic lamellar phases are brought in contact with water. 21,22 In contrast to drops immersed in a bulk reservoir, which finally become completely solubilized, the growth of the filaments in the sandwiched configuration ceases after about 30 min, which might be due to the limited amount of the C 14 TAB solution surrounding the sandwiched drop. Furthermore, we have observed that the behavior of the smectic 8CB drops strongly depends on the history of their formation: Drops which are directly immersed into the C 14 TAB solution in the smectic state show the growth of filaments and become solubilized.…”

Section: ■ Microscopy Observationsmentioning

confidence: 99%

Solubilization of Thermotropic Liquid Crystal Compounds in Aqueous Surfactant Solutions

et al. 2012

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We study the micellar solubilization of three thermotropic liquid crystal compounds by immersing single drops in aqueous solutions of the ionic surfactant tetradecyltrimethylammonium bromide. For both nematic and isotropic drops, we observe a linear decrease of the drop size with time as well as convective flows and self-propelled motions. The solubilization is accompanied by the appearance of small aqueous droplets within the nematic or isotropic drop. At low temperatures, nematic drops expell small nematic droplets into the aqueous environment. Smectic drops show the spontaneous formation of filament-like structures which resemble the myelin figures observed in lyotropic lamellar systems. In all cases, the liquid crystal drops become completely solubilized, provided the weight fraction of the liquid crystal in the system is not larger than a few percent. The solubilization of the liquid crystal drops is compared with earlier studies of the solubilization of alkanes in ionic surfactant solutions.

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Section: ■ Microscopy Observationsmentioning

confidence: 99%

Solubilization of Thermotropic Liquid Crystal Compounds in Aqueous Surfactant Solutions

et al. 2012

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“…Surfactants are widely used in many fields including cosmetics, coatings and especially in the detergent industry [1][2][3]. Anionic surfactants, such as linear sodium alkylbenzenesulfonate (NaLAS), alkylether sulfate (AES) and alkyl sulfate (AS) are popular due to their attractive economics to meet consumer requirements for lower-cost and higher-performance products [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Improvement of the inherent dissolution rate of detergent products is a hot issue for research and process development [7]. The dissolution process is complicated for surfactant-water systems due to the formation of highly viscous liquid crystalline phases, such as hexagonal and lamellar phases [8] that could potentially inhibit the dissolution process [1]. Of late, several studies on the phase behavior of NaLAS have been reported [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Insights into the Dissolution Kinetics of NaLAS Tablets

Pan

Shen²,

Guan³

et al. 2017

J Surfact & Detergents

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In this work, the dissolution behaviors of a series of sodium alkylbenzenesulfonates (NaLAS) tablets with different moisture contents and neutralization degrees were investigated in aqueous solution. The ANOVA‐based, model‐independent and model‐dependent methods were employed to perform comparison analyses on dissolution profiles. The measurements of powder X‐ray diffraction patterns and mechanical properties elucidate distinct differences in each formula. The results show that ANOVA provides a possibility for finding the source of differences among different variables, and the model‐independent methods including the k values and mean dissolution time are easy to interpret and perform comparison analyses. The Hixson–Crowell model gives satisfactory correlation results for the dissolution data and the dissolution kinetics parameters are obtained. The inhibition effects of neutralization degree and moisture content on NaLAS dissolution were examined, which reveals that the increase in lamellar phase proportion leads to the reduction of dissolution rate. The comparison analyses performed in this work form part of a methodology for dissolution profile prediction and comparison.

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