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Svanedal, Ida
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Publications (10 of 13) Show all publications
From, M., Larsson, P. T., Andreasson, B., Medronho, B., Svanedal, I., Edlund, H. & Norgren, M. (2020). Tuning the properties of regenerated cellulose: Effects of polarity and water solubility of the coagulation medium. Carbohydrate Polymers, 236, Article ID 116068.
Open this publication in new window or tab >>Tuning the properties of regenerated cellulose: Effects of polarity and water solubility of the coagulation medium
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2020 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 236, article id 116068Article in journal (Refereed) Published
Abstract [en]

In this study, the effect of different alcohols and esters as a coagulation medium in the regeneration of cellulose dissolved in an aqueous LiOH-urea-based solvent was thoroughly investigated using various methods such as solid state NMR, X-ray diffraction, water contact angle, oxygen gas permeability, mechanical testing, and scanning electron microscopy. It was observed that several material properties of the regenerated cellulose films follow trends that correlate to the degree of cellulose II crystallinity, which is determined to be set by the miscibility of the coagulant medium (nonsolvent) and the aqueous alkali cellulose solvent rather than the nonsolvents’ polarity. This article provides an insight, thus creating a possibility to carefully tune and control the cellulose material properties when tailor-made for different applications. 

Keywords
Cellulose, Coagulation medium, Crystallinity, Polarity, Regeneration
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-38656 (URN)10.1016/j.carbpol.2020.116068 (DOI)000519306900074 ()2-s2.0-85080088394 (Scopus ID)
Available from: 2020-03-16 Created: 2020-03-16 Last updated: 2020-04-03Bibliographically approved
From, M., Andreasson, B., Svanedal, I., Larsson, T., Edlund, H. & Norgren, M. (2019). Influence of regeneration liquid polarity on different material properties of dried cellulose II films. Abstracts of Papers of the American Chemical Society, 257, Article ID 120.
Open this publication in new window or tab >>Influence of regeneration liquid polarity on different material properties of dried cellulose II films
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2019 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 257, article id 120Article in journal, Meeting abstract (Refereed) Published
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-38459 (URN)000478860502524 ()
Note

National Meeting of the American-Chemical-Society (ACS), Orlando, FL, MAR 31-APR 04, 2019

Available from: 2020-02-19 Created: 2020-02-19 Last updated: 2020-02-19Bibliographically approved
Eivazihollagh, A., Svanedal, I., Edlund, H. & Norgren, M. (2019). On chelating surfactants: Molecular perspectives and application prospects. Journal of Molecular Liquids, 278, 688-705
Open this publication in new window or tab >>On chelating surfactants: Molecular perspectives and application prospects
2019 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 278, p. 688-705Article in journal, Editorial material (Refereed) Published
Abstract [en]

Chelating agents, molecules that very strongly coordinates certain metal ions, are used industrially as well as in consumer products to minimize disturbances and increase performance of reactions and applications. The widely used sequestering agents, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) belong to this branch of readily water-soluble compounds. When these chemical structures also have hydrophobic parts, they are prone to adsorb at air-water interfaces and to self-assemble. Such bifunctional molecules can be called chelating surfactants and will have more extended utilization prospects than common chelating agents or ordinary ionic surfactants. The present review attempts to highlight the fundamental behavior of chelating surfactants in solution and at interfaces, and their very specific interactions with metal ions. Methods to recover chelating surfactants from metal chelates are also described. Moreover, utilization of chelating surfactants in applications for metal removal in environmental engineering and mineral processing, as well as for metal control in the fields of biology, chemistry and physics, is exemplified and discussed.

Keywords
Chelating surfactants, Metallosurfactants, Amphiphiles, Self-assembly, Metal-coordination, Sequestering agents, Complexing agents, Remediation, Flotation, Metal recovery, Recovery, Catalysis, Metalloenzymes, Contrast agents, Nanoparticle synthesis, Applications
National Category
Mineral and Mine Engineering Nano Technology Bioremediation Water Treatment Environmental Management Paper, Pulp and Fiber Technology Bio Materials Biocatalysis and Enzyme Technology Chemical Engineering Other Chemical Engineering Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:miun:diva-35610 (URN)10.1016/j.molliq.2019.01.076 (DOI)000461526600074 ()2-s2.0-85061119211 (Scopus ID)
Available from: 2019-02-08 Created: 2019-02-08 Last updated: 2019-05-20Bibliographically approved
Eivazihollagh, A., Tejera, J., Svanedal, I., Edlund, H., Blanco, A. & Norgren, M. (2017). Removal of Cd2+, Zn2+, and Sr2+ by Ion Flotation, Using a Surface-Active Derivative of DTPA (C12-DTPA). Industrial & Engineering Chemistry Research, 56(38), 10605-10614
Open this publication in new window or tab >>Removal of Cd2+, Zn2+, and Sr2+ by Ion Flotation, Using a Surface-Active Derivative of DTPA (C12-DTPA)
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2017 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 56, no 38, p. 10605-10614Article in journal (Refereed) Published
Abstract [en]

Ion flotation was studied for the removal of cadmium, zinc, and strontium ions from aqueous solutions at pH 5–9 in a customized flotation cell, using an aminopolycarboxylic chelating surfactant, 2-dodecyldiethylenetriamine pentaacetic acid (C12-DTPA) in combination with two foaming agents: dodecyltrimethylammonium chloride (DoTAC) and dimethyldodecylamine-N-oxide (DDAO). The results from experiments showed that both Zn2+ and Cd2+ could be removed via ion flotation to 100% at pH 5, and Sr2+ could be removed via ion flotation to 60%–70% at pH 7–9. The removal of metal ions from the flotation cell was seen to vary with pH, but this was not exclusively related to the magnitudes of the formed metal ion-chelating surfactant conditional stability constants. The removal was also dependent on the foam properties of the samples that were found to vary over the investigated pH interval. The outcome of the investigation points to the chelating surfactant C12-DTPA having excellent chelating properties for all of the studied ions above pH 7. In combination with correctly chosen foaming agents, the optimized surfactant system could be expected to provide very efficient remediation of waters polluted with metal ions via ion flotation.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-31643 (URN)10.1021/acs.iecr.7b03100 (DOI)000412043400007 ()2-s2.0-85030457973 (Scopus ID)
Available from: 2017-09-20 Created: 2017-09-20 Last updated: 2018-06-28Bibliographically approved
Svanedal, I., Andersson, F., Hedenström, E., Norgren, M., Edlund, H., Satija, S. K., . . . Rennie, A. R. (2016). Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface. Langmuir, 32(42), 10936-10945
Open this publication in new window or tab >>Molecular Organization of an Adsorbed Layer: A Zwitterionic, pH-Sensitive Surfactant at the Air/Water Interface
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2016 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 32, no 42, p. 10936-10945Article in journal (Refereed) Published
Abstract [en]

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 (C-12-DTPA) has a large headgroup 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 counterions 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, winch 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 headgroup 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 headgroup 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 headgroup.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-29306 (URN)10.1021/acs.langmuir.6b02598 (DOI)000386422300017 ()2-s2.0-84994012272 (Scopus ID)FSCN (Local ID)FSCN (Archive number)FSCN (OAI)
Available from: 2016-11-17 Created: 2016-11-17 Last updated: 2017-11-29Bibliographically approved
Svanedal, I. (2014). Fundamental Characterization and Technical Aspects of a Chelating Surfactant. (Doctoral dissertation). sundsvall: Mid Sweden University
Open this publication in new window or tab >>Fundamental Characterization and Technical Aspects of a Chelating Surfactant
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The purpose of this study was to investigate the fundamental characteristics of a chelating surfactant in terms of solution behaviour, chelation of divalent metal ions, and interaction in mixtures with different foaming agents and divalent metal ion, as well as examining its prospects in some practical applications. Chelating surfactants are functional molecules, with both surface active and chelating properties, which are water soluble and therefore suitable for chelation in many aqueous environments. The dual functionality offers the possibility to recover the chelating surfactant as well as the metals.

The DTPA (diethylenetriaminepentaacetic acid)-based chelating surfactant 4-C12-DTPA (2-dodecyldiethylenetriaminepentaacetic acid) was synthesized at Mid Sweden University. In the absence of metal ions, all eight donor atoms in the headgroup of 4-C12-DTPA are titrating and the headgroup charge can be tuned from +3 to -5 by altering the pH. The solution properties, studied by surface tension measurements and NMR diffusometry, were consequently found strongly pH dependent. pH measurements of chelating surfactant solutions as a function of concentration was used to extract information regarding the interaction between surfactants in the aggregation process.

Small differences in the conditional stability constants (log K) between coordination complexes of DTPA and 4-C12-DTPA, determined by competition measurements utilizing electrospray ionization mass spectrometry (ESI-MS), indicated that the hydrocarbon tail only affected the chelating ability of the headgroup to a limited extent. This was further confirmed in hydrogen peroxide bleaching of thermomechanical pulp (TMP) treated with 4-C12-DTPA.

Interaction parameters for mixed systems of 4-C12-DTPA and different foaming agents were calculated following the approach of Rubingh’s regular solution theory. The mixtures were also examined with addition of divalent metal ions in equimolar ratio to the chelating surfactant. Strong correlation was found between the interaction parameter and the phase transfer efficiency of Ni2+ ions during flotations. Furthermore, a significant difference in log K between different metal complexes with 4-C12-DTPA enabled selective recovery of the metal ion with the highest log K.

The findings in this study contribute to the understanding of the fundamental characteristics of chelating surfactants, which can be further utilized in practical applications.

Place, publisher, year, edition, pages
sundsvall: Mid Sweden University, 2014. p. 48
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 179
Keywords
chelating surfactant, DTPA based surfactant, pH-responsive, characterization, surface tension, NMR diffusometry, conditional stability constants, interaction parameter, ion flotation
National Category
Physical Chemistry
Identifiers
urn:nbn:se:miun:diva-21405 (URN)978-91-87557-39-2 (ISBN)
Public defence
2014-03-21, Sal M102, Mittuniversitetet, sundsvall, 10:15 (English)
Opponent
Supervisors
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2014-02-20Bibliographically approved
Svanedal, I., Boija, S., Norgren, M. & Edlund, H. (2014). Headgroup interactions and ion flotation efficiency in mixtures of a chelating surfactant, different foaming agents and divalent metal ions. Langmuir, 30(22), 6331-6338
Open this publication in new window or tab >>Headgroup interactions and ion flotation efficiency in mixtures of a chelating surfactant, different foaming agents and divalent metal ions
2014 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, no 22, p. 6331-6338Article in journal (Refereed) Published
Abstract [en]

The correlation between interaction parameters and ion flotation efficiency in mixtures of chelating surfactant metal complexes and different foaming agents was investigated. We have recently shown that chelating surfactant 2-dodecyldiethylenetriaminepentaacetic acid (4-C-12-DTPA) forms strong coordination complexes with divalent metal ions, and this can be utilized in ion flotation. Interaction parameters for mixed micelles and mixed monolayer formation for Mg2+ and Ni2+ complexes with the chelating surfactant 4-C-12-DTPA and different foaming agents were calculated by Rubingh's regular solution theory. Parameters for the calculations were extracted from surface tension measurements and NMR diffusometry. The effects of metal ion coordination on the interactions between 4-C-12-DTPA and the foaming agents could be linked to a previously established difference in coordination chemistry between the examined metal ions. As can be expected from mixtures of amphoteric surfactants, the interactions were strongly pH-dependent. Strong correlation was found between interaction parameter beta(sigma)for mixed monolayer formation and the phase-transfer efficiency of Ni2+ complexes with 4-C-12-DTPA during flotation in a customized flotation cell. In a mixture of Cu(2+)and Zn2+, the significant difference in conditional stability constants (log K) between the metal complexes was utilized to selectively recover the metal complex with the highest log K (Cu2+) by ion flotation. Flotation experiments in an excess concentration of metal ions confirmed the coordination of more than one metal ion to the headgroup of 4-C-12-DTPA.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:miun:diva-21402 (URN)10.1021/la500689n (DOI)000337198900004 ()2-s2.0-84902190309 (Scopus ID)
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2017-12-06Bibliographically approved
Svanedal, I., Persson, G., Norgren, M. & Edlund, H. (2014). Interactions in Mixed Micellar Systems of an Amphoteric Chelating Surfactant and Ionic Surfactants. Langmuir, 30(5), 1250-1256
Open this publication in new window or tab >>Interactions in Mixed Micellar Systems of an Amphoteric Chelating Surfactant and Ionic Surfactants
2014 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, no 5, p. 1250-1256Article in journal (Refereed) Published
Abstract [en]

Mixtures of ionic surfactants and the chelating surfactant 2-dodecyldiethylenetriaminepentaacetic acid (4-C12-DTPA) have been examined in terms of interactions in mixed micellar systems. The amphoteric 4-C12-DTPA is zwitterionic with a negative net charge at the studied pH levels. The investigated ionic surfactants were the cationic dodecyltrimethylammonium chloride (DoTAC), the anionic sodium dodecyl sulfate (SDS), and the zwitterionic dimethyldodecylamine-N-oxide (DDAO). The surfactants all have the same hydrophobic chain lengths, and the results are evaluated in terms of headgroup interactions. 4-C12-DTPA interacts with different ionic surfactants by accepting or donating protons to the aqueous solution to increase the attractive interactions between the two surfactants; i.e., the protonation equilibrium of 4-C12-DTPA is shifted in different directions depending on whether there are predominant repulsions between positively or negatively charged groups in the mixed micelles. This was monitored by measuring pH vs concentration in the mixed systems. By measuring the pH, it was also possible to study the shift in the protonation equilibrium at increasing concentration, as the composition in the micelles approaches the composition in the total solution. Following the approach of Rubingh's regular solution theory, the interaction parameter β for mixed micelle formation was calculated from the cmc values determined by NMR diffusometry. Synergism in mixed micelle formation and negative β parameters were found in all of the investigated systems. As expected, the most negative β parameter was found in the mixture with DoTAC, followed by DDAO and SDS. The self-diffusion in the 4-C12-DTPA/DoTAC system was also discussed. The self-diffusion coefficient vs concentration plots show two distinctly different curves, depending on the surfactant that is present in excess.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:miun:diva-21404 (URN)10.1021/la404656b (DOI)000331344000008 ()2-s2.0-84894189855 (Scopus ID)
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2017-12-06Bibliographically approved
Svanedal, I., Boija, S., Almesåker, A., Persson, G., Andersson, F., Hedenström, E., . . . Edlund, H. (2014). Metal Ion Coordination, Conditional Stability Constants and Solution Behavior of Chelating Surfactant Metal Complexes. Langmuir, 30(16), 4605-4612
Open this publication in new window or tab >>Metal Ion Coordination, Conditional Stability Constants and Solution Behavior of Chelating Surfactant Metal Complexes
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2014 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 30, no 16, p. 4605-4612Article in journal (Refereed) Published
Abstract [en]

Coordination complexes of some divalent metal ions with the DTPA (diethylenetriaminepentaacetic acid)-based chelating surfactant 2-dodecyldiethylenetriaminepentaacetic acid (4-C12-DTPA) have been examined in terms of chelation and solution behavior. The headgroup of 4-C 12-DTPA contains eight donor atoms that can participate in the coordination of a metal ion. Conditional stability constants for five transition metal complexes with 4-C12-DTPA were determined by competition measurements between 4-C12-DTPA and DTPA, using electrospray ionization mass spectrometry (ESI-MS). Small differences in the relative strength between the coordination complexes of DTPA and 4-C12-DTPA indicated that the hydrocarbon tail only affected the chelating ability of the headgroup to a limited extent. The coordination of Cu2+ ions was investigated in particular, using UV-visible spectroscopy. By constructing Job's plots, it was found that 4-C12-DTPA could coordinate up to two Cu2+ ions. Surface tension measurements and NMR diffusometry showed that the coordination of metal ions affected the solution behavior of 4-C 12-DTPA, but there were no specific trends between the studied divalent metal complexes. Generally, the effects of the metal ion coordination could be linked to the neutralization of the headgroup charge of 4-C 12-DTPA, and the resulting reduced electrostatic repulsions between adjacent surfactants in micelles and monolayers. The pH vs concentration plots, on the other hand, showed a distinct difference between 4-C12-DTPA complexes of the alkaline earth metals and the transition metals. This was explained by the difference in coordination between the two groups of metal ions, as predicted by the hard and soft acid and base (HSAB) theory.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:miun:diva-21401 (URN)10.1021/la5002336 (DOI)000335297300011 ()2-s2.0-84899622360 (Scopus ID)
Available from: 2014-02-20 Created: 2014-02-20 Last updated: 2017-12-06Bibliographically approved
Svanedal, I., Persson, G., Norgren, M. & Edlund, H. (2013). Anomalies in Solution Behavior of an Alkyl Aminopolycarboxylic Chelating Surfactant. Langmuir, 29(45), 13708-13716
Open this publication in new window or tab >>Anomalies in Solution Behavior of an Alkyl Aminopolycarboxylic Chelating Surfactant
2013 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 29, no 45, p. 13708-13716Article in journal (Refereed) Published
Abstract [en]

The solution behavior of a DTPA (diethylenetriaminepentaacetic acid)-based chelating surfactant, 4-C12-DTPA, has beenstudied by tensiometry and NMR diffusometry. In the absence of metalions, the eight donor atoms in the headgroup are titrating, and thecharge of the headgroup can thus be tuned by altering the pH. 4-C12-DTPA changes from cationic at very low pH, over a number ofzwitterionic species as the pH is increased, and eventually becomesanionic at high pH. Around the isoelectric point, the chelatingsurfactant precipitated. The solution properties, studied above thesolubility gap, were found strongly pH dependent. When increasing theamount of negative charges in the headgroup, by increasing the pH, theadsorption efficiency was reduced and the cmc was increased. Anoptimum in surface tension reduction was found at pH 5, due to aproper balance between protonated and dissociated groups. Anomaliesbetween surface tension measurements and NMR diffusometry in determination of cmc revealed a more complex relationbetween surface tension, surface coverage, and cmc than usually considered, which is not in line with the common interpretationof the Gibbs adsorption equation. At some of the investigated pH levels, measurements of bulk pH could confirm the location ofcmc, 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 isexplained by rearrangements of the large head groups to reduce the headgroup area and increase the packing parameter.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:miun:diva-20289 (URN)10.1021/la4024508 (DOI)000327044600007 ()2-s2.0-84887573543 (Scopus ID)
Available from: 2013-11-22 Created: 2013-11-22 Last updated: 2017-12-06Bibliographically approved
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