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Filippov, Andrei, PhDORCID iD iconorcid.org/0000-0002-6810-1882
Publikasjoner (10 av 69) Visa alla publikasjoner
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
Åpne denne publikasjonen i ny fane eller vindu >>CO2 absorption and ion mobility in aqueous choline-based ionic liquids
2019 (engelsk)Inngår i: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 276, s. 748-752Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2019
Emneord
Ionic liquids, CO2 absorption, Nuclear magnetic resonance, Diffusivity of ions, Phase transformations
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-72056 (URN)10.1016/j.molliq.2018.12.045 (DOI)000459528600083 ()2-s2.0-85058405735 (Scopus ID)
Merknad

Validerad;2019;Nivå 2;2019-01-03 (svasva)

Tilgjengelig fra: 2018-12-16 Laget: 2018-12-16 Sist oppdatert: 2019-04-12bibliografisk kontrollert
Arkhipov, V. P., Arkhipov, R. V., Idiyatullin, Z. S. & Filippov, A. (2019). Dynamic and structural properties, cloud point of mixed micelles of oxyethylated isononylphenols. Journal of Dispersion Science and Technology
Åpne denne publikasjonen i ny fane eller vindu >>Dynamic and structural properties, cloud point of mixed micelles of oxyethylated isononylphenols
2019 (engelsk)Inngår i: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

We measured the self-diffusion coefficients of mixed micelles formed in binary mixtures of oxyethylated isononylphenols (neonols) AF9-2,3,4,6,8,9,10,12 by NMR diffusometry in aqueous 1 wt% solutions. The effective hydrodynamic radii of the micelles were calculated using the Stokes-Einstein relation. Cloud points of these solutions were determined visually and the relation between the cloud point and the composition of the mixture was suggested. Extraction of phenol from the solutions at their cloud points was also studied.

sted, utgiver, år, opplag, sider
Taylor & Francis, 2019
Emneord
Nonionic surfactant, oxyethylated isononylphenols, cloud point, mixed micelles, NMR, diffusion
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-76818 (URN)10.1080/01932691.2019.1679168 (DOI)000492600800001 ()
Tilgjengelig fra: 2019-11-22 Laget: 2019-11-22 Sist oppdatert: 2019-11-22
Kotenkov, S. A., Gnezdilov, O. I., Khaliullina, A. V., Antzutkin, O., Gimatdinov, R. S. & Filippov, A. (2019). Effect of Cholesterol and Curcumin on Ordering of DMPC Bilayers. Applied Magnetic Resonance, 50(1-3), 511-520
Åpne denne publikasjonen i ny fane eller vindu >>Effect of Cholesterol and Curcumin on Ordering of DMPC Bilayers
Vise andre…
2019 (engelsk)Inngår i: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 50, nr 1-3, s. 511-520Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this work, we compared the effects of curcumin and cholesterol directly competing to insert into the DMPC lipid bilayer during bilayer formation from an initially non-ordered state. 2H and 14N nuclear magnetic resonance spectroscopy showed that curcumin is not embedded deep in the lipid bilayer and interacts mainly with the head group of the lipid. In a more complex system of DMPC/CHOL/CUR, curcumin amplifies the effect of cholesterol on the ordering of lipid acyl chains.

sted, utgiver, år, opplag, sider
Springer, 2019
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-72752 (URN)10.1007/s00723-018-1102-2 (DOI)000458124800036 ()2-s2.0-85057198967 (Scopus ID)
Merknad

Validerad;2019;Nivå 2;2019-03-08 (johcin)

Tilgjengelig fra: 2019-01-31 Laget: 2019-01-31 Sist oppdatert: 2019-03-08bibliografisk kontrollert
Arkhipov, V. P., Arkhipov, R. V., Kuzina, N. A. & Filippov, A. (2019). Oxyethylated Isononylphenols in Carbon Tetrachloride. Applied Magnetic Resonance, 50(12), 1381-1389
Åpne denne publikasjonen i ny fane eller vindu >>Oxyethylated Isononylphenols in Carbon Tetrachloride
2019 (engelsk)Inngår i: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 50, nr 12, s. 1381-1389Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Translational diffusion coefficients of ethoxylated isononylphenol molecules C9H19C6H4O(C2H4O)nH in carbon tetrachloride were measured by nuclear magnetic resonance diffusometry. The hydrodynamic radii of the molecules were determined within the framework of the Stokes–Einstein relation. We showed that ethoxylated isononylphenols in carbon tetrachloride do not form micelles, and the dependence of the diffusion coefficients and, accordingly, the hydrodynamic radii of the nonionic surfactants on the number of oxyethylene groups have a kink in the region n = 6–8.

HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-76431 (URN)10.1007/s00723-019-01164-2 (DOI)000488902300002 ()
Merknad

Validerad;2019;Nivå 2;2019-11-21 (johcin)

Tilgjengelig fra: 2019-10-18 Laget: 2019-10-18 Sist oppdatert: 2019-11-21bibliografisk kontrollert
Butakov, A., Filippov, A., Gimatdinov, R. & Chernov, V. (2019). Peculiarities of NMR relaxation in micellar gels of Pluronic F-127. Journal of Dispersion Science and Technology, 40(3), 403-407
Åpne denne publikasjonen i ny fane eller vindu >>Peculiarities of NMR relaxation in micellar gels of Pluronic F-127
2019 (engelsk)Inngår i: Journal of Dispersion Science and Technology, ISSN 0193-2691, E-ISSN 1532-2351, Vol. 40, nr 3, s. 403-407Artikkel i tidsskrift (Fagfellevurdert) Published
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. 

sted, utgiver, år, opplag, sider
Taylor & Francis, 2019
Emneord
Blockcopolymer, NMR relaxation, phase diagram, Poloxamer
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-71025 (URN)10.1080/01932691.2018.1470532 (DOI)000463092400010 ()
Merknad

Validerad;2019;Nivå 2;2019-04-03 (johcin)

Tilgjengelig fra: 2018-09-28 Laget: 2018-09-28 Sist oppdatert: 2019-04-12bibliografisk kontrollert
Filippov, A., Antzutkin, O. & Shah, F. U. (2019). Rapid carbene formation increasing ion diffusivity in an imidazolium acetate ionic liquid confined between polar glass plates. Physical Chemistry, Chemical Physics - PCCP, 21(40), 22531-22538
Åpne denne publikasjonen i ny fane eller vindu >>Rapid carbene formation increasing ion diffusivity in an imidazolium acetate ionic liquid confined between polar glass plates
2019 (engelsk)Inngår i: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 21, nr 40, s. 22531-22538Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

1-Ethyl-3-methyl-imidazolium acetate ([EMIM][OAc]) is one of the most widely used ionic liquids for various applications. This study is focussed on the chemical stability of [EMIM][OAc] on the surfaces of polar glass plates. 1H and 13C NMR spectroscopy and NMR diffusometry of [EMIM][OAc] IL confined between glass plates with a specific surface area 105–106 m−1 are thoroughly investigated. A rapid and spontaneous reaction took place on the surfaces of glass plates leading to the formation of neutral chemical moieties as evident by the appearance of new signals in the 1H NMR spectra. These new products are assigned as N-heterocyclic carbene (NHC) and acetic acid. These neutral chemical moieties have significantly increased the ion diffusivity by dissociation of the cation and the anion in [EMIM][OAc] IL. The yield and rate of formation of NHC and acetic acid are found to increase with the increasing surface area of polar glass plates and the time of contact between the IL and glass surfaces. Based on NMR spectroscopy, a dissociative reaction mechanism is proposed for the formation of free NHC in the neat [EMIM][OAc] IL.

sted, utgiver, år, opplag, sider
Royal Society of Chemistry, 2019
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-76117 (URN)10.1039/C9CP04504J (DOI)31588443 (PubMedID)2-s2.0-85073483050 (Scopus ID)
Merknad

Validerad;2019;Nivå 2;2019-10-25 (johcin)

Tilgjengelig fra: 2019-09-25 Laget: 2019-09-25 Sist oppdatert: 2019-11-04bibliografisk kontrollert
Filippov, A., Antzutkin, O. & Shah, F. U. (2019). Reactivity of CO2 with aqueous choline-based ionic liquids probed by solid-state NMR spectroscopy. Journal of Molecular Liquids, 286, Article ID 110918.
Åpne denne publikasjonen i ny fane eller vindu >>Reactivity of CO2 with aqueous choline-based ionic liquids probed by solid-state NMR spectroscopy
2019 (engelsk)Inngår i: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 286, artikkel-id 110918Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

CO2 absorption in a series of choline-based ionic liquids is investigated using solid-state 13C and 15N MAS NMR spectroscopy. Natural abundance and 13C enriched CO2 gas was purged through 50 wt% aqueous solutions of alkyldimethyl(2-hydroxyethyl)ammonium threonine, [N1,1,n,2OH][Threo], (alkyl = butyl, pentyl and hexyl) and pentyldimethyl(2-hydroxyethyl)ammonium taurine [N1,1,5,2OH][Tau]. The process of CO2 absorption results in precipitation of a solid sediment, which stays in equilibrium with the liquid phase. Upon degassing of the sample, the sediment is dissolved back into the IL-aqueous phase. Solid state 13C and 15N MAS NMR data suggest that the solid sediment is composed of neutral threonine (or taurine) in the zwitterionic forms and the liquid phase contained the products of reactions between the ionic liquids and CO2 molecules. A plausible mechanism for formation of the solid sediments and the reaction products in liquid phases is suggested.

sted, utgiver, år, opplag, sider
Elsevier, 2019
Emneord
CO2 absorption, Aqueous choline-based ionic liquids, Liquid-solid equilibrium, 13C and 15N MAS, CP-MAS NMR
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-73873 (URN)10.1016/j.molliq.2019.110918 (DOI)000474308400033 ()2-s2.0-85065237523 (Scopus ID)
Merknad

Validerad;2019;Nivå 2;2019-05-14 (johcin)

Tilgjengelig fra: 2019-05-07 Laget: 2019-05-07 Sist oppdatert: 2019-08-16bibliografisk kontrollert
Filippov, A., Gnezdilov, O. I., Luchkin, A. G. & Antzutkin, O. (2019). Self-diffusion of ethylammonium nitrate ionic liquid confined between modified polar glasses. Journal of Molecular Liquids, 284, 366-371
Åpne denne publikasjonen i ny fane eller vindu >>Self-diffusion of ethylammonium nitrate ionic liquid confined between modified polar glasses
2019 (engelsk)Inngår i: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 284, s. 366-371Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Ethylammonium nitrate (EAN) ionic liquid confined between flat polar glass platesdemonstrates variable diffusivity that is sensitive to an external static magnetic field. Outside the magnetic field, diffusivity between the plates is higher than that in the bulk. However, after placing the system in a strong static magnetic field, the diffusivity gradually decreased. These processes occur during transformations between phases formed in EAN subjected to micrometer-size restrictions outside and within the magnetic field (Filippov et al., JMolLiq. [2018] 268, 49). In this study, we used samples of two types: (i) with roughened surface formed by treatment of the glass plates with aqueous solutions of hydrofluoric acid and (ii) with vacuum deposited TiO2 layers with a thickness of ca. 1 μm at glass-plate edges. Neither the surface modification of the glass plates, nor the TiO2 layers controlled thickness of EAN confined between glass-plates significantly changed the above-described effects, which have been observed in studies using untreated glass plates. Therefore, the range of systems with detected phase transformations in EAN and accompanying effects, such as accelerated diffusivity and change in diffusivity under the influence of a static magnetic field, was expanded to the systems with roughened surfaces and the systems with TiO2 layers controlled inter-plates distances. Results of experiments with roughened surfaces additionally suggested that the phase transformation of confined EAN in the external magnetic field is isotropic in nature rather than a phase transition from “layered to bulk” structures.

sted, utgiver, år, opplag, sider
Elsevier, 2019
Emneord
Nuclear magnetic resonance, DiffusivityIon dynamics, Phase transformations, Restricted diffusion
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-73599 (URN)10.1016/j.molliq.2019.04.021 (DOI)000469154300043 ()2-s2.0-85064072853 (Scopus ID)
Merknad

Validerad;2019;Nivå 2;2019-04-11 (johcin)

Tilgjengelig fra: 2019-04-11 Laget: 2019-04-11 Sist oppdatert: 2019-06-19bibliografisk kontrollert
Dvoyashkin, D. & Filippov, A. (2018). Diffusivity of crude oils contained in macroporous medium: 1H NMR study. Mendeleev communications (Print), 2, 222-224
Åpne denne publikasjonen i ny fane eller vindu >>Diffusivity of crude oils contained in macroporous medium: 1H NMR study
2018 (engelsk)Inngår i: Mendeleev communications (Print), ISSN 0959-9436, E-ISSN 1364-551X, Vol. 2, s. 222-224Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier, 2018
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-68089 (URN)10.1016/j.mencom.2018.03.039 (DOI)000435626800039 ()2-s2.0-85044714633 (Scopus ID)
Merknad

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

Tilgjengelig fra: 2018-03-27 Laget: 2018-03-27 Sist oppdatert: 2018-07-26bibliografisk kontrollert
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
Åpne denne publikasjonen i ny fane eller vindu >>Dynamic Properties of Imidazolium Orthoborate Ionic Liquids Mixed with Polyethylene Glycol Studied by NMR Diffusometry and Impedance Spectroscopy
Vise andre…
2018 (engelsk)Inngår i: Magnetic Resonance in Chemistry, ISSN 0749-1581, E-ISSN 1097-458X, Vol. 56, nr 2, s. 113-119Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2018
HSV kategori
Forskningsprogram
Gränsytors kemi
Identifikatorer
urn:nbn:se:ltu:diva-64929 (URN)10.1002/mrc.4636 (DOI)000419519200009 ()28752526 (PubMedID)2-s2.0-85040248332 (Scopus ID)
Merknad

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

Tilgjengelig fra: 2017-07-31 Laget: 2017-07-31 Sist oppdatert: 2018-12-14bibliografisk kontrollert
Organisasjoner
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-6810-1882