Effect of pH on the critical micelle concentration of sodium dodecyl sulphate

Rahman, Aly Abdel; Brown, Chris W.

doi:10.1002/app.1983.070280407

Cited by 130 publications

(71 citation statements)

References 6 publications

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“…However, the monodispersity of the samples prepared at pH 5 and 7 is quite high compared to other samples. Below pH 4, the CMC is decreased [18]. As a result of which, the number of SDS per micelle is decreased and the number of Ca 2?…”

Section: Sem and Tem Studymentioning

confidence: 99%

Morphology and photoluminescence of self-assembled CaWO4:Sm3+ microspheres: effect of pH and surfactant concentration

Ningombam

Nongmaithem

2017

Int Nano Lett

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Self-assembled CaWO 4 :Sm 3? microspheres were prepared via surfactant (sodium dodecyl sulfate) mediated hydrothermal method. The effect of pH and the concentration of surfactant on the morphology and photoluminescence of the synthesized phosphors have been studied. Samples were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence spectroscopy. The microspheres were found to have an average size of 1-2 lm. They were mesoporous in nature and constituted of nanocrystals of about 10-30 nm dimension. The TEM images revealed the interlinking framework of the nano-sized constituents which consequently lead to the formation of mesoporous microspheres. The lowering of pH causes a slight reduction in the size of microspheres which could have been attributed to loss of OH from the nanoparticle surface and subsequent retardation in the adsorption of growing molecular CaWO 4 :Sm 3? units. Also, as pH increases, crystallinity decreases. The increase in amount of SDS reduced the crystallinity of the materials, destroyed the monodispersity of microspheres and lowered the luminescence output. It was found that lower pH and higher monodispersity of microspheres are quite favourable for high luminescence output.

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Section: Sem and Tem Studymentioning

confidence: 99%

Morphology and photoluminescence of self-assembled CaWO4:Sm3+ microspheres: effect of pH and surfactant concentration

Ningombam

Nongmaithem

2017

Int Nano Lett

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“…ADBAC is a cationic substance that contains a hydrophobic hydrocarbon chain (C12 to C18) and a hydrophilic or polar group associated with the positively charged nitrogen group. Because of its structural nature, above a certain solution concentration (critical micelle concentration, CMC), the monomers undergo self-assembly to form roughly spherical aggregations known as micelles (Shaw 1992 (Fuguet et al 2005;Jiang et al 2003;Rahman 1983;Shaw 1992).…”

Section: Introductionmentioning

confidence: 99%

Alkyl dimethyl benzyl ammonium chloride adsorption mechanism on wood

Lee

Cooper

2010

Cellulose

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The adsorption of alkyl dimethyl benzyl ammonium chloride (ADBAC) on wood was investigated. The changes in zeta potential curves of wood and ADBAC adsorption with increasing ADBAC concentration were highly correlated and showed two different mechanisms for ADBAC adsorption on wood: ion exchange reaction at low concentration and additional aggregation form of adsorption by hydrophobic interaction at high concentration. ADBAC adsorbed at a low solution concentration had high leaching resistance while ADBAC adsorbed into wood at above the critical micelle concentration (CMC) had low leaching resistance. The CMC decreased with addition of Mea, Cu-Mea, and buffer chemicals. The anion, Cl -of ADBAC was only adsorbed at solution concentrations above the CMC and was easily leached out. The adsorption isotherm of ADBAC on wood before and after leaching was fit to the Langmuir, BET, and Freundlich isotherm models; the BET and Freundlich models fit the adsorption isotherm well before leaching and the Langmuir and the Freundlich models showed better fits to the adsorption isotherm after leaching. The adsorption capacity of ADBAC into wood by cation exchange did not achieve the cation exchange capacity (CEC) of wood.

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“…Using a pK a value for SDS of 1. 38 According to equation (7), these factors should result in an overall increase in the normalized breakthrough force if the activation volume remains constant. However, if the activation volume of SDS micelles bound by hydronium ions is smaller than that of SDS micelles bound by sodium ions, similar to the case for added magnesium ions, then the decrease in overall activation volume could overcome the CMC effect and lower the breakthrough force.…”

mentioning

confidence: 99%

Nanomechanical Characterization of Micellar Surfactant Films via Atomic Force Microscopy at a Graphite Surface

Micklavzina

Zhang

et al. 2017

Langmuir

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In this work, we study the mechanical properties of sodium dodecylsulfate (SDS) and dodecylamine hydrochloride (DAH) micellar films at a graphite surface via atomic force microscopy (AFM). Breakthrough forces for these films were measured using silicon nitride cantilevers, and found to be 1.1 ±0.1 nN for a 10 mM DAH film and 3.0 ±0.3 nN for a 10 mM SDS film. For 10 mM SDS films, it was found that the addition of 1.5 mM of NaCl, Na 2 SO 4 , or MgCl 2 produced a 50-70% increase in measured breakthrough force. Similar results were found for 10 mM DAH films when NaCl and MgCl 2 were added. A model was developed, based upon previous work on lipid films and CMC data gathered via spectrofluorometry measurements, to produced the observed differences. The pH of the bulk solution was varied for both 10 mM SDS and DAH films, and was found to have little effect on breakthrough force.

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Effect of pH on the critical micelle concentration of sodium dodecyl sulphate

Cited by 130 publications

References 6 publications

Morphology and photoluminescence of self-assembled CaWO4:Sm3+ microspheres: effect of pH and surfactant concentration

Morphology and photoluminescence of self-assembled CaWO4:Sm3+ microspheres: effect of pH and surfactant concentration

Alkyl dimethyl benzyl ammonium chloride adsorption mechanism on wood

Nanomechanical Characterization of Micellar Surfactant Films via Atomic Force Microscopy at a Graphite Surface

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