The Interaction Parameter in Binary Surfactant Mixtures of a Chelating Surfactant and a Foaming Agent

Högberg, Ida; Андерссон, Фредрик; Hedenström, Erik; Norgren, Magnus; Edlund, Håkan

doi:10.1007/978-3-642-19038-4_3

Cited by 7 publications

(13 citation statements)

References 9 publications

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“…All intermediate products and the end product C 12 D 25 -DTPA could be identified and compared spectroscopically with the undeuterated analogues presented earlier . In 1 H and 13 C NMR spectroscopy, the signals of the C 12 D 25 -alkyl moiety are absent and only some trace signals due to incomplete deuteration are present.…”

Section: Materials and Methodsmentioning

confidence: 77%

“…% D) for introduction of the deuterium labeled part of C 12 D 25 -DTPA. The method used was described by us previously for the undeuterated analogue . The synthesis commenced with a malonic ester synthesis of diethyl acetamidoacetate and 1-bromododecane- d 25 (Scheme ), followed by an acidic hydrolysis/decarboxylation step resulting in an alkyl- d 25 amino acid hydrochloride.…”

Section: Materials and Methodsmentioning

confidence: 99%

“…The method used was described by us previously for the undeuterated analogue. 17 The synthesis commenced with a malonic ester synthesis of diethyl acetamidoacetate and 1-bromododecane-d 25 (Scheme 1), followed by an acidic hydrolysis/decarboxylation step resulting in an alkyl-d 25 amino acid hydrochloride. This alkyl-d 25 amino acid hydrochloride was esterified to methyl 2-aminotetradecanoate-d 25 hydrochloride (1), using MeOH and SOCl 2 , in 81% total yield over three steps, using the method of Culbertson and Porter, 18 for a similar compound.…”

Section: Methodsmentioning

confidence: 99%

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Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface

et al. 2016

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Neutron and X-ray reflection measurements have been used to study the structure of the adsorbed layer of a chelating surfactant at the air/liquid interface. The chelating surfactant 2-dodecyldiethylenetriaminepentaacetic acid (C12-DTPA) has a large head group containing eight donor atoms that can participate in the coordination of metal ions. The donor atoms are also titrating, resulting in an amphoteric surfactant that can adopt a number of differently charged species depending on the pH. Very strong coordination complexes are formed with metal ions, where the metal ion can be considered as part of the surfactant structure, in contrast to monovalent cations that act as regular counter-ions to the negative net charge. Adsorption was investigated over a large concentration interval, from well below the critical micelle concentration (cmc) to five times the cmc. The most striking result is the maximum in the surface excess found around the cmc, which is consistent with previous indications from surface tension measurements. Adding divalent metal ions has a limited effect on the adsorption at the air/liquid interface. The reason is the coordination of the metal ion, resulting in compensating deprotonation of the complex. Small variations in the head group area of different metal complexes are found, correlating to the conditional stability constants. Adding sodium chloride has a significant effect on the adsorption behavior and the results indicate that the protonation equilibrium is more important than the ionic strength effects. From combined fits of the neutron and X-ray data, a model that consists of a thick head group region and a relatively thin dehydrated tail region is found, and it indicates that the tails are not fully extended and that the limiting area per molecule is determined by the bulky head group.

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Section: Materials and Methodsmentioning

confidence: 77%

Section: Materials and Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface

et al. 2016

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“…The combination of 4-C12-DTPA/DoTAC gave better results than the combination of DTPA/DoTAC with regard to the reduction of both the turbidity and the content of Mn 2+ in the L-water. It is correlated to the adsorption at air-water interfaces of the chelating surfactant, which results in the efficient foam formation ability compared to the usual DTPA (Högberg et al 2011(Högberg et al , 2012. Table 3 shows the results from the investigation of the influence of temperature and pH value on both the removal of Mn 2+ ions and the decrease of turbidity in L-water, respectively.…”

Section: Effect Of Different Foaming Agents In Combination With a Chementioning

confidence: 99%

“…The inducted air flotation of different process waters is facilitated by the addition of a chelating surfactant (Högberg et al 2011(Högberg et al , 2012 and different foaming agents. The influence of the pH value and the temperature on the flotation efficiency has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Zasadowski¹,

Hedenström²,

Edlund³

et al. 2012

BioResources

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The influence of a chelating surfactant, different foaming agents, cationic polyelectrolytes, pH value, and temperature on the purification efficiency of process waters from a mechanical pulp mill has been studied by flotation in a 1 L customized unit. Turbidity measurements and gas chromatography (GC) were carried out to determine the removal and characteristics of dissolved and colloidal substances (DisCo). The manganese ion content in the process waters before flotation and the metal chelate removal capacity by flotation were determined by Inductively Coupled Plasma (ICP) and Atomic Absorption Spectrometry (AAS) measurements. It was found that a 99% removal of complex bound manganese ions and a 94% decrease in turbidity of the TMP water produced at the laboratory can be achieved in a single-stage flotation with a chelating surfactant and a foaming agent. Furthermore, a 91% decrease in turbidity, the removal of up to 96% of resin and fatty acids, and 93% of triglycerides from TMP water can be obtained after application of a foaming agent.

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Anomalies in Solution Behavior of an Alkyl Aminopolycarboxylic Chelating Surfactant

et al. 2013

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The solution behavior of a DTPA (diethylenetriamine pentaacetic acid)-based chelating surfactant, 4-C12-DTPA, has been studied by tensiometry and NMR diffusometry. In the absence of metal ions, the eight donor atoms in the headgroup are titrating, and the charge of the headgroup can thus be tuned by altering the pH. 4-C12-DTPA changes from cationic at very low pH, over a number of zwitterionic species as the pH is increased, and eventually becomes anionic at high pH. Around the isoelectric point, the chelating surfactant precipitated. The solution properties, studied above the solubility gap, were found strongly pH dependent. When increasing the amount of negative charges in the headgroup, by increasing the pH, the adsorption efficiency was reduced and the cmc was increased. An optimum in surface tension reduction was found at pH 5, due to a proper balance between protonated and dissociated groups. Anomalies between surface tension measurements and NMR diffusometry in determination of cmc revealed a more complex relation between surface tension, surface coverage, and cmc than usually considered, which is not in line with the common interpretation of the Gibbs adsorption equation. At some of the investigated pH levels, measurements of bulk pH could confirm the location of cmc, due to the increased protonation of micelles compared to monomers in solution. The adsorption of monomers to the air-water interface showed unusually slow time dependence, evident from decreasing surface tension for several hours. This is explained by rearrangements of the large head groups to reduce the headgroup area and increase the packing parameter.

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The Interaction Parameter in Binary Surfactant Mixtures of a Chelating Surfactant and a Foaming Agent

Cited by 7 publications

References 9 publications

Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface

Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface

Removal of lipophilic extractives and manganese ions from Spruce TMP waters in a customized flotation cell

Anomalies in Solution Behavior of an Alkyl Aminopolycarboxylic Chelating Surfactant

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