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Filippov, Andrei, PhDORCID iD iconorcid.org/0000-0002-6810-1882
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Publications (10 of 103) Show all publications
Xu, Y., Filippov, A., Bhowmick, S., Johansson, P. & Shah, F. U. (2024). Fluorine-Free “Solvent-in-Salt” Sodium Battery Electrolytes: Solvation Structure and Dynamics. Energy Advances
Open this publication in new window or tab >>Fluorine-Free “Solvent-in-Salt” Sodium Battery Electrolytes: Solvation Structure and Dynamics
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2024 (English)In: Energy Advances, E-ISSN 2753-1457Article in journal (Refereed) Accepted
Keywords
fluorine-free, sodium conducting electrolytes, NMR diffusometry, local structure, ion transport
National Category
Materials Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-104259 (URN)10.1039/d4ya00002a (DOI)
Funder
Swedish Research Council, 2020-00969
Note

License full text: CC BY

Available from: 2024-02-12 Created: 2024-02-12 Last updated: 2024-02-12
Ahmed, M., Filippov, A., Johansson, P. & Shah, F. U. (2024). Pyrrolidium‐ and Imidazolium‐Based Ionic Liquids and Electrolytes with Flexible Oligoether Anions. ChemPhysChem
Open this publication in new window or tab >>Pyrrolidium‐ and Imidazolium‐Based Ionic Liquids and Electrolytes with Flexible Oligoether Anions
2024 (English)In: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641Article in journal (Refereed) Epub ahead of print
Place, publisher, year, edition, pages
John Wiley & Sons, 2024
National Category
Energy Engineering
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-104277 (URN)10.1002/cphc.202300810 (DOI)
Funder
Swedish Energy Agency, 48194-1
Available from: 2024-02-14 Created: 2024-02-14 Last updated: 2024-02-14
Arkhipov, V. P., Arkhipov, R. V., Kuzina, N., Petrova, E. V. & Filippov, A. (2023). Aggregation Properties of Triton X-100 in a Mixture of Ordinary and Heavy Water. Applied Magnetic Resonance, 54(3), 415-425
Open this publication in new window or tab >>Aggregation Properties of Triton X-100 in a Mixture of Ordinary and Heavy Water
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2023 (English)In: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 54, no 3, p. 415-425Article in journal (Refereed) Published
Abstract [en]

The dynamic and aggregation properties of Triton X-100 in a mixture of ordinary and heavy water in a wide temperature range from room temperature to the cloud point and above were studied. The ratio of ordinary and heavy water was calculated in such a way as to ensure equal densities of Triton X-100 and the water mixture. This made it possible to exclude the effects of sedimentation and study the evolution of Triton X-100 micelles and aggregates, without complication by the effects of spatial phase separation above the cloud point. Self-diffusion coefficients of Triton X-100 molecules were measured by NMR, and the effective hydrodynamic radii of micelles and aggregates were calculated using the Stokes-Einstein relation. The anomalous temperature behavior of the diffusion coefficient of Triton X-100 molecules is explained by changes in the sizes of diffusing objects during their evolution from micelles to dehydrated aggregates below the cloud point and by changes in the sizes of aggregates above the cloud point. The results of the NMR studies are confirmed by data obtained by dynamic light scattering.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-95862 (URN)10.1007/s00723-023-01529-8 (DOI)000934332600001 ()2-s2.0-85147927821 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-03-15 (hanlid);

Funder: Ministry of Science and Higher Education of the Russian Federation (075-10-2021-115); Program Priority-2030 for Kazan Federal University

Available from: 2023-03-13 Created: 2023-03-13 Last updated: 2023-03-15Bibliographically approved
Bhowmick, S., Ahmed, M., Filippov, A., Loaiza, L. C., Shah, F. U. & Johansson, P. (2023). Ambient Temperature Liquid Salt Electrolytes. Chemical Communications, 59(18), 2620-2623
Open this publication in new window or tab >>Ambient Temperature Liquid Salt Electrolytes
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2023 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 59, no 18, p. 2620-2623Article in journal (Refereed) Published
Abstract [en]

Alkali metal salts usually have high melting points due to strong electrostatic interactions and solvents are needed to create ambient temperature liquid electrolytes. Here, we report on six phosphate-anion-based alkali metal salts, Li/Na/K, all of which are liquids at room temperature, with glass transition temperatures ranging from −61 to −29 °C, and are thermally stable up to at least 225 °C. While the focus herein is on various physico-chemical properties, these salts also exhibit high anodic stabilities, up to 6 V vs. M/M+ (M = Li/Na/K), and deliver some battery performance – at elevated temperatures as there are severe viscosity limitations at room-temperature. While the battery performance arguably is sub-par, solvent-free electrolytes based on alkali metal salts such as these should pave the way for conceptually different Li/Na/K-batteries, either by refined anion design or by using several salts to create eutectic mixtures.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2023
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-95508 (URN)10.1039/d3cc00318c (DOI)36757288 (PubMedID)2-s2.0-85148675900 (Scopus ID)
Funder
Swedish Energy Agency, 48194-1The Kempe Foundations, SMK-1945
Note

Validerad;2023;Nivå 2;2023-03-09 (joosat);

Licens fulltext: CC BY License

Available from: 2023-02-04 Created: 2023-02-04 Last updated: 2023-09-05Bibliographically approved
Ahmed, M., Rao, S. S., Filippov, A., Johansson, P. & Shah, F. U. (2023). Aromatic Heterocyclic Anion Based Ionic Liquids and Electrolytes. Physical Chemistry, Chemical Physics - PCCP, 25(4), 3502-3512
Open this publication in new window or tab >>Aromatic Heterocyclic Anion Based Ionic Liquids and Electrolytes
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2023 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 25, no 4, p. 3502-3512Article in journal (Refereed) Published
Abstract [en]

Five new ionic materials comprising fluorine-free aromatic heterocyclic anions based on pyridine and pyrazine combined with a common n-tetrabutylphosphonium cation, (P4444)+, result in two room temperature ionic liquids (RTILs), one semi-solid, and two organic ionic plastic crystals (OIPCs) with melting points >20 °C. The OIPCs showed a plastic crystalline phase, multiple solid–solid transitions, and plastic crystalline and melt phases. For both the neat RTILs and the Li+ conducting electrolytes, the nature and strength of the ion–ion interactions mainly depend on the position of the nitrogen atom with respect to the carboxylate group in the anions. Furthermore, for the RTILs the ionic conductivity is effected by the electronic structure and flexibility of the ions and the anions diffuse faster than the (P4444)+ cation, but are slowed down in the electrolytes due to the strong electrostatic interactions between the carboxylate group of the anions and the Li+, as shown both experimentally and computationally. Overall, this study describes the effect of structural tuning of aromatic anions on the ion–ion interactions and introduces new ionic materials with promising properties to be used as solid and liquid electrolytes in energy storage devices.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2023
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-95154 (URN)10.1039/d2cp05272e (DOI)000912797200001 ()36637119 (PubMedID)2-s2.0-85146281496 (Scopus ID)
Funder
Swedish Energy Agency, 48194-1
Note

Validerad;2023;Nivå 2;2023-02-10 (joosat);

Licens fulltext: CC BY License

Available from: 2023-01-04 Created: 2023-01-04 Last updated: 2023-09-05Bibliographically approved
Tatrari, G., Bhowmick, S., Filippov, A., An, R. & Shah, F. U. (2023). Charge storage performance of a structurally flexible hybrid ionic liquid electrolyte. Energy Storage, Article ID e535.
Open this publication in new window or tab >>Charge storage performance of a structurally flexible hybrid ionic liquid electrolyte
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2023 (English)In: Energy Storage, ISSN 2578-4862, article id e535Article in journal (Refereed) Epub ahead of print
Abstract [en]

The electrochemical and charge storage performance of a fluorine-free structurally flexible hybrid pyrrolidinium-based ionic liquid electrolyte (HILE) in a symmetric graphite-based supercapacitor is thoroughly investigated. The HILE revealed thermal decomposition at above 230°C, a glass transition (Tg) temperature of below −70°C, and ionic conductivity of 0.16 mS cm−1 at 30°C. The chemical and electrochemical properties are investigated using a systematic variable temperature 1H and 31P NMR spectroscopy and diffusometry, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge (GCD). The supercapacitor demonstrated a notable specific capacitance of 186 F g−1 at a scan rate of 1 mV s−1 and a specific capacitance of 122 F g−1 at a current density of 0.5 A g−1. The maximum energy density of 48.8 Wh kg−1, a power density of 450 W kg−1 at a current density of 0.5 A g−1, and a potential window of 4 V were obtained. Altogether, this study demonstrates that the new HILE can be used in symmetric graphite-based supercapacitors over a wide potential window of 4 V and a temperature range from −20°C to 90°C. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Materials Chemistry Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-103048 (URN)10.1002/est2.535 (DOI)
Funder
European CommissionThe Kempe Foundations, JCK22-0045, SMK21-0013
Note

License full text: CC BY-NC-ND 4.0

Available from: 2023-11-28 Created: 2023-11-28 Last updated: 2023-11-28
Filippov, A., Soenen, H., Blom, J. & Antzutkin, O. N. (2023). Dynamics and Structure of a Bitumen Emulsion as Studied by 1H NMR Diffusometry. ACS Omega, 8(39), 36534-36542
Open this publication in new window or tab >>Dynamics and Structure of a Bitumen Emulsion as Studied by 1H NMR Diffusometry
2023 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 8, no 39, p. 36534-36542Article in journal (Refereed) Published
Abstract [en]

Self-diffusion in a bitumen emulsion was studied by H-1 NMR. The emulsion forms two phases: continuous and dispersed. The continuous aqueous phase contains mainly water, with the energy of activation of the diffusion process equal to that of bulk water, while its diffusivity is smaller than that of bulk water by a factor of 2. The dispersed phase consists of bitumen droplets containing confined water, whose dynamics is characterized by a fully restricted diffusion regime in cavities with sizes of similar to 0.11 mu m. Therefore, the studied bitumen emulsion can be described by a model of a complex multiple emulsion of the water/oil/water (WOW) type. The suggested model does agree well with data from H-1 NMR spectroscopy and diffusometry of the bitumen emulsion doped with paramagnetic MnSO4(aq) as well as with an additional H-1 NMR study of the emulsion structure, in which emulsion stability was compromised by freezing at 253 K.

Place, publisher, year, edition, pages
Amer Chemical Soc, 2023
National Category
Physical Chemistry Other Chemistry Topics
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-101967 (URN)10.1021/acsomega.3c05492 (DOI)001070217800001 ()2-s2.0-85174915693 (Scopus ID)
Funder
Swedish Research Council Formas, 2021-01515
Note

Validerad;2023;Nivå 2;2023-11-14 (marisr);

License fulltext: CC BY

Available from: 2023-10-31 Created: 2023-10-31 Last updated: 2023-11-14Bibliographically approved
Ahmed, M., Bhowmick, S., Filippov, A., Johansson, P. & Shah, F. U. (2023). Ionic Liquids and Electrolytes with Flexible Aromatic Anions. Chemistry - A European Journal, 29(41), Article ID e202301000.
Open this publication in new window or tab >>Ionic Liquids and Electrolytes with Flexible Aromatic Anions
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2023 (English)In: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 29, no 41, article id e202301000Article in journal (Refereed) Published
Abstract [en]

Five new n-tetrabutylphosphonium (P4444)+ cation based ionic liquids (ILs) with oligoether substituted aromatic carboxylate anions have been synthesized. The nature and position of the oligoether chain affect thermal stability (up to 330 ºC), phase behaviour (Tg < -55 ºC) and ion transport. Furthermore, with the aim of application in lithium batteries, electrolytes were created for two of the ILs by 10 mol% doping using the corresponding Li-salts. This affects the ion diffusion negatively, from being higher and equal for cations and anions to lower for all ions and unequal. This is due to the stronger ionic interactions and formation of aggregates, primarily between the Li+ ions and the carboxylate group of the anions. Electrochemically, the electrolytes have electrochemical stability windows up to 3.5 V, giving some promise for battery application.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
flexible anions, fluorine-free electrolytes, ionic liquids, lithium-ion batteries, oligoether
National Category
Physical Chemistry Materials Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-97028 (URN)10.1002/chem.202301000 (DOI)001001650200001 ()37144646 (PubMedID)2-s2.0-85160913596 (Scopus ID)
Funder
Swedish Energy Agency, 48194-1
Note

Validerad;2023;Nivå 2;2023-08-15 (marisr);

License fulltext: CC-BY-NC. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

Available from: 2023-05-08 Created: 2023-05-08 Last updated: 2023-10-11Bibliographically approved
Arkhipov, V. P., Arkhipov, R. V., Petrova, E. V. & Filippov, A. (2023). Micellar and solubilizing properties of rhamnolipids. Magnetic Resonance in Chemistry, 61(6), 345-355
Open this publication in new window or tab >>Micellar and solubilizing properties of rhamnolipids
2023 (English)In: Magnetic Resonance in Chemistry, ISSN 0749-1581, E-ISSN 1097-458X, Vol. 61, no 6, p. 345-355Article in journal (Refereed) Published
Abstract [en]

We studied the micellar and solubilizing properties of aqueous solutions of unfractionated rhamnolipids produced by Pseudomonas aeruginosa. We used nuclear magnetic resonance (NMR) diffusometry, dynamic light scattering, and conductometry to measure the critical micelle concentration (CMC) of rhamnolipid solutions and determined the effective hydrodynamic radii of rhamnolipid monomers and micelles. Based on selective measurements of the self-diffusion coefficients of molecules, performed by NMR diffusometry, the solubilizing properties of rhamnolipids were studied depending on their concentration in solution; aromatic hydrocarbons, benzene, toluene, ethylbenzene, and para-xylene were taken as solubilizates. On the basis of the measurement results, we estimated the distribution coefficient of the solubilizate between the micellar (solubilized) and free (in the aqueous phase) states and the solubilizing capacity of rhamnolipid micelles.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
aromatic hydrocarbons, CMC, dynamic light scattering, NMR, rhamnolipids, self-diffusion coefficients, solubilization
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-95883 (URN)10.1002/mrc.5337 (DOI)000940802100001 ()36840535 (PubMedID)2-s2.0-85149279616 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-07-21 (sofila);

Funder; Ministry of Science and Higher educationof the Russian Federation (grant no. 075-15-2021-699); Kazan Federal University (ProgramPriority-2030);

Licens fulltext: CC BY-NC-ND License

Available from: 2023-03-15 Created: 2023-03-15 Last updated: 2023-10-11Bibliographically approved
Arkhipov, V. P., Arkhipov, R. & Filippov, A. (2023). Rhamnolipid Biosurfactant: Use for the Removal of Phenol from Aqueous Solutions by Micellar Solubilization. ACS Omega, 8(33), 30646-30654
Open this publication in new window or tab >>Rhamnolipid Biosurfactant: Use for the Removal of Phenol from Aqueous Solutions by Micellar Solubilization
2023 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 8, no 33, p. 30646-30654Article in journal (Refereed) Published
Abstract [en]

Selective measurements of the self-diffusion coefficients of molecules of the biological surfactant rhamnolipid (RL) in individual aqueous solutions and in solutions with phenol as a solubilizate were carried out by nuclear magnetic resonance (NMR) diffusometry. Based on the obtained results, the solubilization characteristics of RLs were calculated. They are the fraction of solubilized phenol molecules, the phenol micelle-water distribution coefficient, the molar solubilization coefficient, the hydrodynamic radii of RL monomers and micelles, the aggregation numbers of micelles, and the solubilization capacity of micelles. Fraction of the solubilized phenol molecules increases and approaches 80-90% with increasing RL concentration. The solubilization capacity of the micelles increases from several units to 102 with an increase in both the concentration of RLs and the concentration of phenol in solution.

Place, publisher, year, edition, pages
American Chemical Society, 2023
National Category
Physical Chemistry Other Chemical Engineering
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-101203 (URN)10.1021/acsomega.3c04367 (DOI)001044504100001 ()37636955 (PubMedID)2-s2.0-85168473808 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-09-05 (joosat);

CC BY 4.0 License

Available from: 2023-09-05 Created: 2023-09-05 Last updated: 2023-09-05Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-6810-1882

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