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Filippov, Andrei, PhDORCID iD iconorcid.org/0000-0002-6810-1882
Publications (10 of 63) Show all publications
Filippov, A., Bhattacharyya, S. & Shah, F. U. (2019). CO2 absorption and ion mobility in aqueous choline-based ionic liquids. Journal of Molecular Liquids, 276, 748-752
Open this publication in new window or tab >>CO2 absorption and ion mobility in aqueous choline-based ionic liquids
2019 (English)In: Journal of Molecular Liquids, Vol. 276, p. 748-752Article in journal (Refereed) Published
Abstract [en]

CO2 absorption and ion mobility are investigated in a series of 50/50 wt% aqueous solutions of choline-based ionic liquids with different cations and anions: [N1,1,4,2OH][Threo], [N1,1,5,2OH][Threo], [N1,1,6,2OH][Threo], [N1,1,5,2OH][β-ala] and [N1,1,5,2OH][Tau]. The process of CO2 absorption was completed in an hour reaching maximum of absorption capacity 0.07–0.10 wt% to ionic liquid (by 0.4–0.6 molar ratios). A rapid CO2 absorption is observed by the formation of solid product as a result of reaction between CO2 molecule and the ionic liquid. Diffusion coefficients of the cation and anion in the mixture are comparable while the diffusivity of water molecules is found to be quite different from the ions. In the process of CO2 absorption, an increase in the diffusivity of ions is observed due to the precipitation of solid products and depletion of ions contents in the liquid phase of the system. 13C NMR measurements of diffusivity of CO2 enriched with 13C isotope showed that a part of the absorbed CO2 remained in the liquid phase being physically and chemically bound to ions. The ionic liquid is re-cycled by evaporating water and releasing CO2 molecules using vacuum and temperature.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-72056 (URN)10.1016/j.molliq.2018.12.045 (DOI)
Available from: 2018-12-16 Created: 2018-12-16 Last updated: 2018-12-16
Dvoyashkin, D. & Filippov, A. (2018). Diffusivity of crude oils contained in macroporous medium: 1H NMR study. Mendeleev communications (Print), 2, 222-224
Open this publication in new window or tab >>Diffusivity of crude oils contained in macroporous medium: 1H NMR study
2018 (English)In: Mendeleev communications (Print), ISSN 0959-9436, E-ISSN 1364-551X, Vol. 2, p. 222-224Article in journal (Refereed) Published
Abstract [en]

Diffusivity of crude oils confined in pores of sand decreased with raising the fraction of oil at ordinary temperatures. This behaviour is suggested to be caused by adsorption of the high-molecular fractions of oils at the solid–liquid interface.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-68089 (URN)10.1016/j.mencom.2018.03.039 (DOI)000435626800039 ()2-s2.0-85044714633 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-03-27 (andbra)

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-07-26Bibliographically approved
Filippov, A., Azancheev, N., Gibaydullin, A., Bhattacharyya, S., Antzutkin, O. N. & Shah, F. U. (2018). Dynamic Properties of Imidazolium Orthoborate Ionic Liquids Mixed with Polyethylene Glycol Studied by NMR Diffusometry and Impedance Spectroscopy. Magnetic Resonance in Chemistry, 56(2), 113-119
Open this publication in new window or tab >>Dynamic Properties of Imidazolium Orthoborate Ionic Liquids Mixed with Polyethylene Glycol Studied by NMR Diffusometry and Impedance Spectroscopy
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2018 (English)In: Magnetic Resonance in Chemistry, ISSN 0749-1581, E-ISSN 1097-458X, Vol. 56, no 2, p. 113-119Article in journal (Refereed) Published
Abstract [en]

We used 1H pulsed field gradient (PFG) NMR to study the self-diffusion of polyethylene glycol (PEG) with average molecular mass of 200 and ions in mixtures of PEG with imidazolium bis(mandelato)borate (BMB) and imidazolium bis(oxalato)borate (BOB) ionic liquids (ILs). The ionic liquid was mixed with PEG in the concentration range of 0–100 wt%. Within the temperature range of 295 to 353 K, the diffusion coefficient of BMB is slower than that of the imidazolium cation. The diffusion coefficients of PEG, as well as the imidazolium cation and BMB anions, differ under all experimental conditions tested. This demonstrates that the IL in the mixture is present in at least a partially dissociated state. Generally, increasing the concentration of PEG leads to an increase in the diffusion coefficients of PEG and both the ions, and decreases their activation energy for diffusion. NMR chemical shift alteration analysis showed that the presence of PEG changes the chemical shifts of both ions but in different directions. Impedance spectroscopy was used to measure the ionic conductivity of the ionic liquids mixed with PEG.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
Chemical Sciences Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-64929 (URN)10.1002/mrc.4636 (DOI)000419519200009 ()28752526 (PubMedID)2-s2.0-85040248332 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-01-09 (svasva)

Available from: 2017-07-31 Created: 2017-07-31 Last updated: 2018-12-14Bibliographically approved
Filippov, A., Kurakin, S., Gnezdilov, O. & Antzutkin, O. (2018). Effect of magnetic field on diffusion of ethylammonium nitrate: water mixtures confined between polar glass plates. Journal of Molecular Liquids, 4, 45-51
Open this publication in new window or tab >>Effect of magnetic field on diffusion of ethylammonium nitrate: water mixtures confined between polar glass plates
2018 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 4, p. 45-51Article in journal (Refereed) Published
Abstract [en]

We used 1H NMR diffusometry to study mixtures of ethylammonium nitrate (EAN) with water (3.1–12.4 mol% of added H2O) confined between polar glass plates and exposed to a static magnetic field of 9.4 T. The presence of such restrictions reverses the concentration dependence of the diffusivities of the EA (ethylammonium) cation and water typical for the bulk system. The presence of water weakens the effects of a static magnetic field on diffusion of the EA cation as well as on proton exchange of –NH3 groups. Surprisingly, the amplitude of the echo signal of water protons decreases during exposure to the magnetic field and finally disappears, a phenomenon that depends on the concentration of water in the system. Based on experimental data, we suggest that water in the system is present in two states with different dynamic properties. One type of water formed in confinement possesses NMR relaxation time typical for liquids; its diffusivity can be measured by 1H NMR. The second type of water is formed upon exposure of the sample of the first type to the magnetic field and eventually includes all the water in the system. This type of water possesses “solid-like” NMR relaxation features that makes it “invisible” to the NMR diffusometry technique. We suggest that this second type of water is adsorbed onto the glass plates. Correspondingly, EAN exists in two liquid phases: the first one contains an EAN-water mixture, while the second one contains neat EAN, and forms on the microscopic scale range under the influence of a static magnetic field.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Nuclear magnetic resonance, Diffusivity, Ion dynamics, Water diffusion
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-71407 (URN)10.1016/j.molliq.2018.10.080 (DOI)2-s2.0-85055148175 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-11-01 (svasva)

Available from: 2018-11-01 Created: 2018-11-01 Last updated: 2018-11-13Bibliographically approved
Butakov, A., Filippov, A., Gimatdinov, R. & Chernov, V. (2018). Peculiarities of NMR relaxation in micellar gels of Pluronic F-127. Journal of Dispersion Science and Technology
Open this publication in new window or tab >>Peculiarities of NMR relaxation in micellar gels of Pluronic F-127
2018 (English)In: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351Article in journal (Refereed) Epub ahead of print
Abstract [en]

Based on the 1H relaxation of transverse nuclear magnetization of triblock-copolymer Pluronic F-127 in D2O, we proposed a model of the associated pluronic structure in which the polyethylene oxide of molecules in neighboring micelles are intertwined in regions of overlapping micellar coronas, while the polypropylene oxide cores of the micelles play a role of nodes in the 3D network. 

Place, publisher, year, edition, pages
Taylor & Francis, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-71025 (URN)10.1080/01932691.2018.1470532 (DOI)
Available from: 2018-09-28 Created: 2018-09-28 Last updated: 2018-09-28
Filippov, A., Gnezdilov, O. I. & Antzutkin, O. (2018). Static magnetic field alters properties of confined alkylammonium nitrate ionic liquids. Journal of Molecular Liquids, 268, 49-54
Open this publication in new window or tab >>Static magnetic field alters properties of confined alkylammonium nitrate ionic liquids
2018 (English)In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 268, p. 49-54Article in journal (Refereed) Published
Abstract [en]

Ethylammonium nitrate (EAN) and propylammonium nitrate (PAN) ionic liquids confined between polar glass plates and exposed to a strong magnetic field of 9.4 T demonstrate gradually slowing diffusivity, a process that can be reversed by removing the sample from the magnetic field. The process can be described well by the Avrami equation, which is typical for autocatalytic (particularly, nucleation controlled) processes. The transition can be stopped by freezing the sample. Cooling and heating investigations showed differences in the freezing and melting behavior of the sample depending on whether it had been exposed to the magnetic field. After exposure to the magnetic field, the sample demonstrated decrease in the 1H NMR signal of residual water. 1H NMR spectroscopy with presaturation demonstrates that the most probable mechanism of the decrease of the bulk water signal is adsorption of water on polar surfaces of glass plates. Generally, our findings confirm our previous suggestion that alteration of the dynamic properties of confined alkylammonium nitrate ionic liquids exposed to a magnetic field is related to the alteration of real physical-chemical phases

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-70220 (URN)10.1016/j.molliq.2018.07.027 (DOI)000447817400006 ()2-s2.0-85049811484 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-08-06 (andbra)

Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2018-11-15Bibliographically approved
Filippov, A., Gnezdilov, O. I., Hjalmarsson, N., Antzutkin, O. N., Glavatskih, S., Furo, I. & Rutland, M. W. (2017). Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates. Physical Chemistry, Chemical Physics - PCCP, 19(38), 25853-25858
Open this publication in new window or tab >>Acceleration of diffusion in ethylammonium nitrate ionic liquid confined between parallel glass plates
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2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 38, p. 25853-25858Article in journal (Refereed) Published
Abstract [en]

Diffusion of EAN confined between polar glass plates separated by a few micrometers is higher by a factor of ca. 2 as compared to bulk values. Formation of a new phase, different to the bulk, was suggested.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-65796 (URN)10.1039/c7cp01772c (DOI)000412275200006 ()28932828 (PubMedID)2-s2.0-85030660874 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-10-16 (andbra)

Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2017-11-24Bibliographically approved
Shah, F. U., Oleg, G. & Filippov, A. (2017). Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries. Physical Chemistry, Chemical Physics - PCCP, 19(25), 16721-16730
Open this publication in new window or tab >>Ion dynamics in halogen-free phosphonium bis(salicylato)borate ionic liquid electrolytes for lithium-ion batteries
2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 25, p. 16721-16730Article in journal (Refereed) Published
Abstract [en]

This study was focused on the investigation of ion dynamics in halogen-free, hydrophobic, and hydrolytically stable phosphonium bis(salicylato)borate [P4,4,4,8][BScB] ionic liquid electrolytes for lithium-ion batteries. The structure and purity of the synthesized ionic liquid and lithium bis(salicylato)borate Li[BScB] salt were characterized using 1H, 13C, 31P, and 11B NMR spectroscopy. The Li[BScB] salt was mixed with an ionic liquid at the concentrations ranging from 2.5 mol% to 20 mol%. The physicochemical properties of the resulting electrolytes were characterized using thermal analysis (TGA and DSC), electrical impedance spectroscopy, and pulsed-field gradient (PFG) NMR and ATR-FTIR spectroscopy. The apparent transfer numbers of the individual ions were calculated from the diffusion coefficients of the cation and anion as determined via the PFG NMR spectroscopy. NMR and ATR-FTIR spectroscopic techniques revealed dynamic interactions between the lithium cation and bis(salicylato)borate anion in the electrolytes. The ion–ion interactions were found to increase with the increasing concentration of the Li[BScB] salt, which resulted in ionic clustering at the concentrations higher than 15 mol% of Li salt in the ionic liquid.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-63622 (URN)10.1039/C7CP02722B (DOI)000404530600045 ()28621370 (PubMedID)2-s2.0-85021881483 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-08-11 (rokbeg)

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2018-07-10Bibliographically approved
Javed, M. A., Ahola, S., Håkansson, P., Mankinen, O., Aslam, M. K., Filippov, A., . . . Telkki, V.-V. (2017). Y Structure and dynamics elucidation of ionic liquids using multidimensional Laplace NMR. Chemical Communications, 53(80), 11056-11059
Open this publication in new window or tab >>Y Structure and dynamics elucidation of ionic liquids using multidimensional Laplace NMR
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2017 (English)In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 53, no 80, p. 11056-11059Article in journal (Refereed) Published
Abstract [en]

We demonstrate the ability of multidimensional Laplace NMR (LNMR), comprising relaxation and diffusion experiments, to reveal essential information about microscopic phase structures and dynamics of ionic liquids that is not observable using conventional NMR spectroscopy or other techniques.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-65922 (URN)10.1039/c7cc05493a (DOI)000412410700018 ()28948273 (PubMedID)2-s2.0-85030787744 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-10-11 (andbra)

Available from: 2017-10-03 Created: 2017-10-03 Last updated: 2017-11-24Bibliographically approved
Wei, J., Antzutkin, O., Filippov, A., Iuga, D., Lam, P. Y., Barrow, M. P., . . . O'Connor, P. B. (2016). Amyloid Hydrogen Bonding Polymorphism Evaluated by 15N{17O}REAPDOR Solid-State NMR and Ultra-High Resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (ed.). Biochemistry, 55(14), 2065-2068
Open this publication in new window or tab >>Amyloid Hydrogen Bonding Polymorphism Evaluated by 15N{17O}REAPDOR Solid-State NMR and Ultra-High Resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
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2016 (English)In: Biochemistry, ISSN 0006-2960, E-ISSN 1520-4995, Vol. 55, no 14, p. 2065-2068Article in journal (Refereed) Published
Abstract [en]

A combined approach, using Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) and solid-state NMR (Nuclear Magnetic Resonance), shows a high degree of polymorphism exhibited by Aβ species in forming hydrogen-bonded networks. Two Alzheimer’s Aβ peptides, Ac-Aβ16–22-NH2 and Aβ11–25, selectively labeled with 17O and 15N at specific amino acid residues were investigated. The total amount of peptides labeled with 17O as measured by FTICR-MS enabled the interpretation of dephasing observed in 15N{17O}REAPDOR solid-state NMR experiments. Specifically, about one-third of the Aβ peptides were found to be involved in the formation of a specific >C═17O···H–15N hydrogen bond with their neighbor peptide molecules, and we hypothesize that the rest of the molecules undergo ± n off-registry shifts in their hydrogen bonding networks.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-3009 (URN)10.1021/acs.biochem.5b01095 (DOI)000374197100001 ()26983928 (PubMedID)2-s2.0-84964308549 (Scopus ID)0c14fbe1-4d29-40ed-a247-6aeafe2915c5 (Local ID)0c14fbe1-4d29-40ed-a247-6aeafe2915c5 (Archive number)0c14fbe1-4d29-40ed-a247-6aeafe2915c5 (OAI)
Note

Validerad; 2016; Nivå 2; 20160414 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-6810-1882

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