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Filippov, Andrei, PhDORCID iD iconorcid.org/0000-0002-6810-1882
Publications (10 of 60) Show all publications
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: 2018-02-26Bibliographically approved
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)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: 2018-08-06Bibliographically 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
Arkhipov, V. P., Bogdanova, S. A., Idiyatullin, Z. S., Lunev, I. V. & Filippov, A. (2016). Dynamic and structural properties of oxyethylated isononylphenols (ed.). Mendeleev communications (Print), 26(4), 355-357
Open this publication in new window or tab >>Dynamic and structural properties of oxyethylated isononylphenols
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2016 (English)In: Mendeleev communications (Print), ISSN 0959-9436, E-ISSN 1364-551X, Vol. 26, no 4, p. 355-357Article in journal (Refereed) Published
Abstract [en]

Diffusion coefficients, dielectric relaxation times and refraction coefficients were measured, and activation energies of translational and rotational mobilities were determined for a series of oxyethylated phenols (neonols AF9-n) p-C9H19C6H4-O(CH2CH2O)nH, n = 4, 6, 8, 9, 10, 12, at different temperatures. The results demonstrated the existence of contraction and transition phenomena that changed the structure of neonol molecules at n ∼ 9 from a zigzag to a meander form.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-13528 (URN)10.1016/j.mencom.2016.07.030 (DOI)000382353500030 ()2-s2.0-84982757099 (Scopus ID)cbfe14bc-f13d-4e1f-938f-607500bcb020 (Local ID)cbfe14bc-f13d-4e1f-938f-607500bcb020 (Archive number)cbfe14bc-f13d-4e1f-938f-607500bcb020 (OAI)
Note

Validerad; 2016; Nivå 2; 2016-08-15 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Filippov, A., Kotenkov, S. A., Munavirov, B., Khaliulina, A. V., Gnezdilov, O. I. & Antzutkin, O. (2016). Effect of curcumin on lateral diffusion in lipid bilayers (ed.). Paper presented at . Mendeleev communications (Print), 26(2), 109-110
Open this publication in new window or tab >>Effect of curcumin on lateral diffusion in lipid bilayers
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2016 (English)In: Mendeleev communications (Print), ISSN 0959-9436, E-ISSN 1364-551X, Vol. 26, no 2, p. 109-110Article in journal (Refereed) Published
Abstract [en]

Lateral diffusion in dimyristoylphosphatidylcholine lipid bilayers decreases in the presence of cholesterol and curcumin, as measured by 1H NMR spectroscopy, but the mechanisms of action of these two compounds are different.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-12884 (URN)10.1016/j.mencom.2016.03.007 (DOI)000374813300007 ()2-s2.0-84962185231 (Scopus ID)c08bd940-309b-4001-a59c-38ac866a337c (Local ID)c08bd940-309b-4001-a59c-38ac866a337c (Archive number)c08bd940-309b-4001-a59c-38ac866a337c (OAI)
Note
Validerad; 2016; Nivå 2; 20160406 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Bhattacharyya, S., Filippov, A. & Shah, F. U. (2016). Insights into the Effect of CO2 Absorption on the Ionic Mobility of Ionic Liquids. Physical Chemistry, Chemical Physics - PCCP, 18(41), 28617-28625
Open this publication in new window or tab >>Insights into the Effect of CO2 Absorption on the Ionic Mobility of Ionic Liquids
2016 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 18, no 41, p. 28617-28625Article in journal (Refereed) Published
Abstract [en]

We investigate a comparative effect of CO2 absorption on the ionic mobility of two choline based ionic liquids comprising two different anions such as threonine and imidazole. The synthesized ionic liquids were characterized using 1H and 13C NMR and other spectroscopic techniques. By keeping a common cation and changing the anion from threonine to imidazole both the viscosity and density reduced drastically. We found that [N1,1,6,2OH][Imi] exhibits the highest CO2 capture capacity at 20 °C of 5.27 mol of CO2 per kg of ionic liquid (1.27 mol of CO2 per mol of ionic liquid, 23.26 wt% of CO2) whereas [N1,1,6,2OH][Threo] exhibits 3.6 mol of CO2 per kg of ionic liquid (1.05 mol of CO2 per mol of ionic liquid, 15.87 wt% of CO2). The activation energy for diffusion is calculated using the Vogel-Fulcher-Tamman (VFT) equation in the form of diffusivity. It was found that the activation energy for the diffusion of [N1,1,6,2OH][Threo] is ∼10 times higher than that of [N1,1,6,2OH][Imi]. 1H diffusion NMR data revealed that the diffusivity of [N1,1,6,2OH][Imi] is increased after CO2 absorption whereas a decrease in diffusivity was observed in the case of [N1,1,6,2OH][Threo]. This anomalous behavior of [N1,1,6,2OH][Imi] was further explained by using DFT calculations.

National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
urn:nbn:se:ltu:diva-41888 (URN)10.1039/C6CP05804C (DOI)000386668200025 ()27722357 (PubMedID)2-s2.0-84992190469 (Scopus ID)
Note

Validerad; 2016; Nivå 2; 2016-10-28 (andbra)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-6810-1882

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