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Publications (10 of 25) Show all publications
Han, T., Sophonrat, N., Tagami, A., Sevastyanova, O., Mellin, P. & Yang, W. (2019). Characterization of lignin at pre-pyrolysis temperature to investigate its melting problem. Fuel, 235, 1061-1069
Open this publication in new window or tab >>Characterization of lignin at pre-pyrolysis temperature to investigate its melting problem
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2019 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 235, p. 1061-1069Article in journal (Refereed) Published
Abstract [en]

Technical lignin particles melt under relatively low temperature. This results in the problem in the continuous feeding and fluidization during lignin pyrolysis, which in turn limits its utilization on a large scale. In this study, two most available types of lignin have been used to investigate the lignin melting problem, which are Kraft lignin (KL) from pulping process and hydrolysis lignin (HL) from bio-ethanol production process. Elemental composition, thermal property and thermally decomposed derivatives of each sample are tested by elemental analyzer, TGA, DSC, and Py-GC/MS. Morphology, structure and crystal change before and after heat treatment are tested by microscopy, FTIR and XRD. All results suggest that lignin structure determines its melting properties. Kraft lignin from pulping process contains a less cross-linked structure. It melts under heating. On the other hand, hydrolysis lignin from hydrolysis process contains a highly crossed-linked and condensed structure. It does not melt before decomposition under heat treatment. Modifying lignin structure is suggested for the resolution of technical lignin melting problem.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Hydrolysis lignin (HL), Kraft lignin (KL), Melting properties, Structure, Crystal structure, Fluidization, Heat treatment, Hydrolysis, Melting, Pulp manufacture, Pyrolysis, Structure (composition), Temperature, After-heat treatment, Bio-ethanol production, Crosslinked structures, Elemental compositions, Hydrolysis lignins, Kraft lignin, Pyrolysis temperature, Lignin
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-236342 (URN)10.1016/j.fuel.2018.08.120 (DOI)000447791900105 ()2-s2.0-85052512069 (Scopus ID)
Funder
Swedish Research Council Formas
Note

QC 20181108

Available from: 2018-11-08 Created: 2018-11-08 Last updated: 2018-11-08Bibliographically approved
Halysh, V., Sevastyanova, O., de Carvalho, D. M., Riazanova, A., Lindström, M. & Gomelya, M. (2019). Effect of oxidative treatment on composition and properties of sorbents prepared from sugarcane residues. Industrial crops and products (Print), 139, Article ID UNSP 111566.
Open this publication in new window or tab >>Effect of oxidative treatment on composition and properties of sorbents prepared from sugarcane residues
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2019 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 139, article id UNSP 111566Article in journal (Refereed) Published
Abstract [en]

Efficient sorbents for the removal of cationic dye were prepared from sugarcane bagasse (stalk) and straw (leaves) by oxidative pre-treatment with hydrogen peroxide (H2O2) in acetic acid. The effects of variables, such as concentration of H2O2, temperature and time on the properties of the fiber sorbents obtained were studied according to a 2(3) full-factorial design. For comparison, an oxidative treatment of sugarcane biomass with glacial acetic acid was also used. The yields of the materials obtained and their chemical composition were characterized and compared. Fourier transform infrared spectroscopy, field-emission scanning electron microscopy and benzene vapor adsorption were used to investigate the structural properties and morphology of the initial materials and sorbents. The sorption of methylene blue dye was used to assess the efficiency of dye removal by the sorbents. The pre-treatment conditions significantly affected the sorbent yield, their chemical composition (contents of cellulose, lignin and ash) as well as their sorption properties. The cellulosic sorbent (C-sorbent) from sugarcane bagasse obtained by pre-treatment with H2O2 in acetic acid and the lignocellulosic sorbent (LC-sorbent) from sugarcane straw obtained by pre-treatment with glacial acetic acid, had the highest sorption capacity for the methylene blue dye. For both types of sorbents, the sorption capacity increased with chemical pretreatment as a result of an increase in pore volume.

Place, publisher, year, edition, pages
ELSEVIER, 2019
Keywords
Sugarcane, Straw, Bagasse, Oxidation, Sorbent
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-260986 (URN)10.1016/j.indcrop.2019.111566 (DOI)000484646900086 ()2-s2.0-85069568922 (Scopus ID)
Note

QC 20191010

Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-16Bibliographically approved
de Carvalho, D. M., Moser, C., Lindström, M. & Sevastyanova, O. (2019). Impact of the chemical composition of cellulosic materials on the nanofibrillation process and nanopaper properties. Industrial crops and products (Print), 127, 203-211
Open this publication in new window or tab >>Impact of the chemical composition of cellulosic materials on the nanofibrillation process and nanopaper properties
2019 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 127, p. 203-211Article in journal (Refereed) Published
Abstract [en]

This paper investigated the impact of the amounts of lignin and hemicelluloses on cellulose nanofibers (CNFs). Birch and spruce wood were used to prepare holocellulose and cellulose samples by classical methods. To better assess the effect of the chemical composition on the CNF performance and simplify the process for CNF preparation, no surface derivatization method was applied for CNF preparation. Increased amounts of hemicelluloses, especially mannans, improved the defibration process, the stability of the CNFs and the mechanical properties, whereas the residual lignin content had no significant effect on these factors. On the other hand, high lignin content turned spruce nanopapers yellowish and, together with hemicelluloses, reduced the strain-at-break values. Finally, when no surface derivatization was applied to holocellulose and cellulose samples before defibration, the controlled preservation of residual lignin and hemicelluloses on the CNFs indicate to be crucial for the process. This simplified method of CNF preparation presents great potential for forest-based industries as a way to use forestry waste (e.g., branches, stumps, and sawdust) to produce CNFs and, consequently, diversify the product range and reach new markets.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Birch wood, Spruce wood, Cellulose nanofiber (CNF), Holocellulose CNF, Nanopaper, Residual cell wall components
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-238861 (URN)10.1016/j.indcrop.2018.10.052 (DOI)000452565200025 ()2-s2.0-85055735243 (Scopus ID)
Note

QC 20181120

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2019-01-04Bibliographically approved
Goliszek, M., Podkoscielna, B., Sevastyanova, O., Fila, K., Chabros, A. & Paczkowski, P. (2019). Investigation of accelerated aging of lignin-containing polymer materials. International Journal of Biological Macromolecules, 123, 910-922
Open this publication in new window or tab >>Investigation of accelerated aging of lignin-containing polymer materials
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2019 (English)In: International Journal of Biological Macromolecules, ISSN 0141-8130, E-ISSN 1879-0003, Vol. 123, p. 910-922Article in journal (Refereed) Published
Abstract [en]

This paper presents the results of an accelerated aging test of biocomposites containing kraft lignin, where the resistance of the materials against humidity and light exposure was investigated. Low molecular weight lignin, modified with methacrylic anhydride (LWL-Met), was copolymerized with two commercial monomers: styrene (St) and methyl methacrylate (MMA). The biocomposites were obtained by a bulk polymerization method using alpha,alpha'-azoiso-bis-butyronitrile (AIBN) as a free radical polymerization initiator. The Shore D hardness of the obtained materials was determined before and after aging test. The changes in the chemical structures of polymers, as the result of aging were analyzed by using the attenuated total reflection Fourier transform infrared (ATR/FT-IR) spectroscopy method. The thermal behavior and stability of the obtained materials were investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The surface topography was determined using the optical topography method to evaluate the changes on the surface of synthesized materials resulted from accelerated aging. Application of modified lignin as a biocomponent in the polymerization process and its influence on the properties of the obtained materials before and after the accelerated aging test are discussed.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Lignin, Biocomposites, Accelerated aging test
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-244088 (URN)10.1016/j.ijbiomac.2018.11.141 (DOI)000456760100101 ()30448496 (PubMedID)2-s2.0-85056785716 (Scopus ID)
Note

QC 20190219

Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved
Tagami, A., Gioia, C., Lauberts, M., Budnyak, T., Moriana, R., Lindström, M. & Sevastyanova, O. (2019). Solvent fractionation of softwood and hardwood kraft lignins for more efficient uses: Compositional, structural, thermal, antioxidant and adsorption properties. Industrial crops and products (Print), 129, 123-134
Open this publication in new window or tab >>Solvent fractionation of softwood and hardwood kraft lignins for more efficient uses: Compositional, structural, thermal, antioxidant and adsorption properties
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2019 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 129, p. 123-134Article in journal (Refereed) Published
Abstract [en]

This work summarizes the impact of solvent fractionation on the chemical structure, antioxidant activity, heating values, and thermal and adsorption properties of industrial hardwood and softwood kraft lignins. The aim of the research was to develop a simple approach for obtaining lignin fractions with tailored properties for applications in certain materials. Four common industrial solvents, namely, ethyl acetate, ethanol, methanol and acetone, in various combinations, were found to be efficient for separating spruce and eucalyptus kraft lignins into fractions with low polydispersities. The ethanol fraction of spruce and the ethyl acetate fraction of eucalyptus afforded the highest yields. Gel-permeation chromatography analysis was used to evaluate the efficiency of the chosen solvent combination for lignin fractionation. The composition and structure of the lignin material was characterized by elemental analysis, analytical pyrolysis (Py-GC/MS/FID) and P-31 NMR spectro-scopy. The thermal properties of the lignin samples were studied using thermogravimetric analysis. Proximate analysis data (ash, volatile components, organic matter and fixed carbon) was obtained through the direct measurement of weight changes in each experimental curve, and the high heating values (in MJ/kg) were calculated according to equations suggested in the literature. The adsorption properties of fractionated kraft lignins were studied using methylene blue dye. The correlations observed between molecular weight, composition and functionality and the thermal, radical scavenging and adsorption properties of the lignin fractions provides useful information for selecting the appropriate solvent combinations for specific applications of lignin raw materials (including their use as antioxidants, biofuels or sorbents in water treatment processes).

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2019
Keywords
Kraft lignin, Solvent fractionation, Structural analysis, Antioxidant activity, Thermal stability, Adsorption
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-244491 (URN)10.1016/j.indcrop.2018.11.067 (DOI)000457504200015 ()2-s2.0-85057882324 (Scopus ID)
Note

QC 20190327

Available from: 2019-03-27 Created: 2019-03-27 Last updated: 2019-05-14Bibliographically approved
Zhao, Y., Tagami, A., Dobele, G., Lindström, M. E. & Sevastyanova, O. (2019). The Impact of Lignin Structural Diversity on Performance of Cellulose Nanofiber (CNF)-Starch Composite Films. Polymers, 11(3), Article ID 538.
Open this publication in new window or tab >>The Impact of Lignin Structural Diversity on Performance of Cellulose Nanofiber (CNF)-Starch Composite Films
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2019 (English)In: Polymers, ISSN 2073-4360, E-ISSN 2073-4360, Vol. 11, no 3, article id 538Article in journal (Refereed) Published
Abstract [en]

Lignin fractions having different molecular weights and varied chemical structures isolated from kraft lignins of both softwood and hardwood via a sequential solvent fractionation technique were incorporated into a tunicate cellulose nanofibers (CNF)-starch mixture to prepare 100% bio-based composite films. The aim was to investigate the impact of lignin structural diversity on film performance. It was confirmed that lignin's distribution in the films was dependent on the polarity of solvents used for fractionation (acetone > methanol > ethanol > ethyl acetate) and influenced the optical properties of the films. The -OH group content and molecular weight of lignin were positively related to film density. In general, the addition of lignin fractions led to decrease in thermal stability and increase in Young's modulus of the composite films. The modulus of the films was found to decrease as the molecular weight of lignin increased, and a higher amount of carboxyl and phenolic -OH groups in the lignin fraction resulted in films with higher stiffness. The thermal analysis showed higher char content formation for lignin-containing films in a nitrogen atmosphere with increased molecular weight. In an oxygen atmosphere, the phenol content, saturated side chains and short chain structures of lignin had impacts on the maximum decomposition temperature of the films, confirming the relationship between the chemical structure of lignin and thermo-oxidative stability of the corresponding film. This study addresses the importance of lignin diversities on composite film performance, which could be helpful for tailoring lignin's applications in bio-based materials based on their specific characteristics.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
lignin, successive solvent fractionation, tunicate cellulose nanofibers-starch-lignin composites, film properties, interrelation
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-251350 (URN)10.3390/polym11030538 (DOI)000464510400005 ()30960522 (PubMedID)2-s2.0-85063399636 (Scopus ID)
Note

QC 20190521

Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2019-05-23Bibliographically approved
Goliszek, M., Podkoscielna, B., Sevastyanova, O., Gawdzik, B. & Chabros, A. (2019). The Influence of Lignin Diversity on the Structural and Thermal Properties of Polymeric Microspheres Derived from Lignin, Styrene, and/or Divinylbenzene. Materials, 12(18), Article ID 2847.
Open this publication in new window or tab >>The Influence of Lignin Diversity on the Structural and Thermal Properties of Polymeric Microspheres Derived from Lignin, Styrene, and/or Divinylbenzene
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2019 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 18, article id 2847Article in journal (Refereed) Published
Abstract [en]

This work investigates the impact of lignin origin and structural characteristics, such as molecular weight and functionality, on the properties of corresponding porous biopolymeric microspheres obtained through suspension-emulsion polymerization of lignin with styrene (St) and/or divinylbenzene (DVB). Two types of kraft lignin, which are softwood (Picea abies L.) and hardwood (Eucalyptus grandis), fractionated by common industrial solvents, and related methacrylates, were used in the synthesis. The presence of the appropriate functional groups in the lignins and in the corresponding microspheres were investigated by attenuated total reflectance Fourier transform infrared spectroscopy (ATR/FT-IR), while the thermal properties were studied by differential scanning calorimetry (DSC). The texture of the microspheres was characterized using low-temperature nitrogen adsorption. The swelling studies were performed in typical organic solvents and distilled water. The shapes of the microspheres were confirmed with an optical microscope. The introduction of lignin into a St and/or DVB polymeric system made it possible to obtain highly porous functionalized microspheres that increase their sorption potential. Lignin methacrylates created a polymer network with St and DVB, whereas the unmodified lignin acted mainly as an eco-friendly filler in the pores of St-DVB or DVB microspheres. The incorporation of biopolymer into the microspheres could be a promising alternative to a modification of synthetic materials and a better utilization of lignin.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
lignin, microspheres, composites, polymeric material, fractionation, porosity
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-262980 (URN)10.3390/ma12182847 (DOI)000489126600006 ()31487838 (PubMedID)2-s2.0-85072511392 (Scopus ID)
Note

QC 20191031

Available from: 2019-10-31 Created: 2019-10-31 Last updated: 2019-10-31Bibliographically approved
Puziy, A. M., Poddubnaya, O. I. & Sevastyanova, O. (2018). Carbon Materials from Technical Lignins: Recent Advances. Topics in Current Chemistry, 376(4), Article ID 33.
Open this publication in new window or tab >>Carbon Materials from Technical Lignins: Recent Advances
2018 (English)In: Topics in Current Chemistry, ISSN 2365-0869, Vol. 376, no 4, article id 33Article, review/survey (Refereed) Published
Abstract [en]

Lignin, a major component of lignocellulosic biomass, is generated in enormous amounts during the pulp production. It is also a major coproduct of second generation biofuels. The effective utilization of lignin is critical for the accelerated development of the advanced cellulosic biorefinery. Low cost and availability of lignin make it attractive precursor for preparation of a range of carbon materials, including activated carbons, activated carbon fibers (CF), structural CF, graphitic carbons or carbon black that could be used for environmental protection, as catalysts, in energy storage applications or as reinforcing components in advanced composite materials. Technical lignins are very diverse in terms of their molecular weight, structure, chemical reactivity, and chemical composition, which is a consequence of the different origin of the lignin and the various methods of lignin isolation. The inherent heterogeneity of lignin is the main obstacle to the preparation of high-performance CF. Although lignin-based CF still do not compete with polyacrylonitrile-derived CF in mechanical properties, they nevertheless provide new markets through high availability and low production costs. Alternatively, technical lignin could be used for production of carbon adsorbents, which have very high surface areas and pore volumes comparable to the best commercial activated carbons. These porous carbons are useful for purifying gas and aqueous media from organic pollutants or adsorption of heavy metal ions from aqueous solutions. They also could be used as catalysts or electrodes in electrochemical applications.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Lignin, Activated carbon, Carbon fibers, Carbon catalyst, Carbon electrodes
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-232755 (URN)10.1007/s41061-018-0210-7 (DOI)000438578300001 ()29995273 (PubMedID)2-s2.0-85049851485 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20180802

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-02Bibliographically approved
Aminzadeh, S., Lauberts, M., Dobele, G., Ponomarenko, J., Mattsson, T., Lindström, M. & Sevastyanova, O. (2018). Membrane filtration of kraft lignin: Structural charactristics and antioxidant activity of the low-molecular-weight fraction. Industrial crops and products (Print), 112, 200-209
Open this publication in new window or tab >>Membrane filtration of kraft lignin: Structural charactristics and antioxidant activity of the low-molecular-weight fraction
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2018 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 112, p. 200-209Article in journal (Refereed) Published
Abstract [en]

Lignin, which is the second most abundant biomass component and has carbon-rich phenolic content, is a promising renewable raw material for multiple applications, such as carbon fibers, adhesives, and emulsifiers. To use lignin efficiently, it is important to ensure its purity and homogeneity. As a result, the separation of lignin into fractions with high purity and narrow molecular-weight distributions is likely a prerequisite for several applications. Ultrafiltration using ceramic membranes has many advantages, including enabling direct lignin extraction from Kraft pulp cooking liquors without pH and temperature adjustment. One challenge with membrane filtration using such a system is the potential for reduced membrane performance over time, which is associated with fouling. In this study, LignoBoost Kraft lignin was fractionated using a ceramic membrane with a molecular weight cut-off of 1 kDa. The separation behavior during ultrafiltration fractionation was investigated and the antioxidant properties of the recovered low-molecular-weight (low-MW) lignin samples were evaluated. Using this model system, the permeate fluxes were unstable during the 100 h of membrane operation. However, a decrease in the average MW in the permeate over time was observed. The shift in MW was most pronounced for virgin membranes, while a more stable MW distribution was evident for membranes subjected to multiple cleaning cycles. According to 2D NMR analysis, low-MW lignin that was recovered after 100 h of operation, consisted of smaller lignin fragments, such as dimers and oligomers, with a high content of methoxy-groups. This was confirmed using the size exclusion chromatography method, which indicated an weigh average molecular weight in the range of 450–500 Da. 31P NMR spectroscopy showed that, despite the lower total content of phenolic OH groups, the low-MW sample had a higher proportion of non-condensed phenolic OH groups. The results of the antioxidant tests demonstrated the strong potential of lignin and its low-MW fraction as a natural antioxidant, particularly for lipid-containing systems. The low-MW lignin fraction showed better antioxidant activity than the non-fractionated LignoBoost lignin in the kinetic oxygen radical absorbance capacity (ORAC) test and demonstrated three-fold stronger inhibition of the substrate (fluorescein) than the reference antioxidant Trolox (a water-soluble derivative of vitamin E).

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Antioxidant activity, LignoBoost lignin, Low-MW lignin, Structural analysis, Ultrafiltration
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-220194 (URN)10.1016/j.indcrop.2017.11.042 (DOI)000425561900026 ()2-s2.0-85036614166 (Scopus ID)
Note

QC 20171218

Available from: 2017-12-18 Created: 2017-12-18 Last updated: 2018-11-22Bibliographically approved
Budnyak, T. M., Aminzadeh, S., Pylypchuk, I. V., Sternik, D., Tertykh, V. A., Lindström, M. E. & Sevastyanova, O. (2018). Methylene Blue dye sorption by hybrid materials from technical lignins. Journal of Environmental Chemical Engineering, 6(4), 4997-5007
Open this publication in new window or tab >>Methylene Blue dye sorption by hybrid materials from technical lignins
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2018 (English)In: Journal of Environmental Chemical Engineering, ISSN 2160-6544, E-ISSN 2213-3437, Vol. 6, no 4, p. 4997-5007Article in journal (Refereed) Published
Abstract [en]

New hybrid sorbents were synthesized from technical lignins and silica and were applied for the removal of Methylene Blue dye (MB) from aqueous solution. Kraft softwood lignins from LignoBoost (LBL) and CleanFlowBlack (CFBL) processes were used to understand the influence of molecular weight and functionality of initial lignins on the properties of the final hybrids. The synthesized materials were applied as adsorbents for the removal of MB from aqueous solutions. The effects of parameters such as contact time, initial concentration of dye and initial pH on the adsorption capacity were evaluated. The hybrids exhibited higher adsorption capacity than the initial macromolecules of lignin with respect to MB. The hybrid based on CFBL exhibited an adsorption capacity of 60 mg/g; this value was 30% higher than the capacity of the hybrid based on LBL, which was 41.6 mg/g. Lignin hybrid materials extract 80-99% of the dye in a pH range from 3 to 10. The equilibrium and kinetic characteristics of MB uptake by the hybrids followed the Langmuir isotherm model and pseudosecond-order model, rather than the Freundlich and Temkin models, the pseudo-first-order or the intraparticle diffusion model. The attachment of the dye to the hybrid surface was confirmed via FE-SEM and FTIR spectroscopy. The mechanism for MB adsorption was proposed. Due to the high values of regeneration efficiency of the surface of both lignin-silica hybrid materials in 0.1 M HCl (up to 75%) and ethanol (99%), they could be applied as effective sorbents in industrial wastewater treatment processes.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Lignin, Silica, Hybrids, Adsorption, Methylene Blue dye, Water treatment
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-235458 (URN)10.1016/j.jece.2018.07.041 (DOI)000444046700127 ()2-s2.0-85050740163 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20180928

Available from: 2018-09-28 Created: 2018-09-28 Last updated: 2018-11-22Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7433-0350

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