Adsorption of sodium dodecylsulphate on mercury as an example of micellization within a multilayer interphase

Sotiropoulos, S.; Nikitas, P.; Papadopoulos, Nikos

doi:10.1016/0022-0728(93)80521-i

Cited by 31 publications

(41 citation statements)

References 23 publications

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“…Tensametric curves are shown in Figure 8. If berberine concentration is smaller than 3610 À6 M neither berberine nor canadine are strongly adsorbed, but signi®cant adsorption occurs for 5610 À6 M. It is marked by the desorption of canadine at À1.46 V. In the concentration range between 10 À5 and 10 À4 M condensed ®lms of berberine and canadine exist between À0.6 V and À1.7 V. A transition from the ®rst to the second berberine surface structure is accompanied by a capacitance peak with the potential of maximum which changes from À0.58 V for 5610 À6 M to À0.43 V for 7610 À5 M. Similar peaks were observed in experiments with coumarin [21], thiourea [22], sodium dodecylsulfate [24], isochroman [28], adenine [29] and adamantane [30]. They were ascribed to the reorientation of the molecules into the vertical position [21, 28±30].…”

Section: Resultssupporting

confidence: 69%

“…This phenomenon is well documented in the literature [17±26]. It was observed with many organic molecules, such as quinoline [17], 3-methyl-isoquinoline [18], thymine [19], cytidine [20], coumarin [21], thiourea [22], uracil [23], sodium dodecylsulfate [24], a-and g-cyclodextrins [25] and hypoxanthine [26]. These are mostly electroinactive molecules, while berberine can be reduced at À1.1 V and electrogenerated canadine may form a new condensed ®lm at the electrode surface.…”

Section: Resultsmentioning

confidence: 95%

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Adsorption and Reduction of Berberine at a Mercury Electrode

Komorsky‐Lovrić

2000

Electroanalysis

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Adsorption and reduction of berberine are investigated by alternating current polarography and square-wave voltammetry in electrolytes of various pH. Both berberine and the product of its reduction canadine form condensed ®lms on the mercury electrode surface. These processes limit the analytical application of square-wave voltammetry combined with adsorptive accumulation of berberine. Reduction of berberine is totally irreversible and occurs between À0.95 V and À1.35 V, depending on berberine concentration and pH of solution. Canadine is electroinactive and can not be reoxidized on mercury electrode. Its condensed ®lm is very stable, even at À0.5 V, and may prevent adsorption of berberine. The properties of square-wave voltammetric responses of berberine in acidic, neutral and basic electrolytes are reported and the conditions for their electroanalytical application are discussed.

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Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 95%

Adsorption and Reduction of Berberine at a Mercury Electrode

Komorsky‐Lovrić

2000

Electroanalysis

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“…This is due to the fact that the packing density of surfactant is higher at a more negative potential. Therefore it is reasonable to assume that at quite negative potentials, a high concentration of surfactant covers the electrode‐electrolyte interface and leads to the transformation of a spherical micellar phase into a lyotropic lamellar liquid crystalline phase, resulting in a nanosheet structure during the metal deposition step . After the deposition of mesoporous Ni, a homogeneous film thickness was observed by SEM (Figure f, cross section view).…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Multiporous Nickel for Oxygen Evolution Reaction in Alkaline Media

et al. 2019

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Electrochemical water splitting is a crucially important process for energy conversion and storage. In this context, we report the synthesis of hierarchical multiporous nickel nanosheets obtained by a templated two-step electrodeposition of nickel in the presence of silica beads and an assembly of nonionic surfactant in order to generate a combined macro-and mesoporous structure. Interestingly, the synergistic effect of these highly ordered meso-and macroporous structures promotes the catalytic performance for oxygen evolution reaction with one order of magnitude higher current densities and a better stability of the electrodes compared to flat nickel or electrodes having a single type of porosity. This example illustrates a promising strategy for the rational design of highperformance porous metals, not only in the frame of water electrolysis, but also for other electrocatalytic applications.[a] S. Assavapanumat, M. Ketkaew, P. Garrigue, V. Lapeyre, Dr.

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“…The adsorption of SDS on electrode surfaces was studied by several groups e.g. on polycrystalline platinum, 19 mercury, 20 alumina, 21 graphite, 22 and on a hydrocarbon monolayer. 23 Burgess et al reported 24,25 that there are two potential regimes with different stages of SDS adsorption on Au(111) in 16 mM SDS solutions, separated by a peak in the differential capacitance curve at E SCE ¼ +0.4 V. In regime I (À0.2 V < E SCE < +0.2 V) the gold surface is covered with a layer of hemimicelles, which was confirmed by STM and AFM images.…”

Section: Resultsmentioning

confidence: 99%

Nanostructuring of a sodium dodecyl sulfate-covered Au(111) electrode

Petri

Kolb

2002

Phys. Chem. Chem. Phys.

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In situ scanning tunneling microscopy (STM) and electrochemical measurements were used to investigate the properties of adsorbed sodium dodecyl sulfate (SDS) on Au(111) in sulfuric acid solutions and the effect of this adlayer on the copper deposition. The results confirm former studies by Burgess et al. that SDS molecules are adsorbed in hemimicellar aggregates (state I) at potentials between E SCE ¼ À0.2 and +0.3 V and they form a condensed layer at E SCE > +0.45 V (state II). The adsorbed SDS film represents a kinetic barrier for the copper deposition. With the tip of the STM it is possible to remove the tarnishing SDS film in a predetermined area and thus make this area available for copper bulk deposition. In this way, the electrode was nanostructured with copper clusters and copper lines without harming the gold surface. In this preliminary study, the influence of the tunneling current and other parameters, which affect the nanostructuring process, is presented.

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Adsorption of sodium dodecylsulphate on mercury as an example of micellization within a multilayer interphase

Cited by 31 publications

References 23 publications

Adsorption and Reduction of Berberine at a Mercury Electrode

Adsorption and Reduction of Berberine at a Mercury Electrode

Hierarchical Multiporous Nickel for Oxygen Evolution Reaction in Alkaline Media

Nanostructuring of a sodium dodecyl sulfate-covered Au(111) electrode

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