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Adolfsson, Karin H.
Publications (9 of 9) Show all publications
Delekta, S. S., Adolfsson, K. H., Benyahia Erdal, N., Hakkarainen, M., Östling, M. & Li, J. (2019). Fully inkjet printed ultrathin microsupercapacitors based on graphene electrodes and a nano-graphene oxide electrolyte. Nanoscale, 11(21), 10172-10177
Open this publication in new window or tab >>Fully inkjet printed ultrathin microsupercapacitors based on graphene electrodes and a nano-graphene oxide electrolyte
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2019 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 11, no 21, p. 10172-10177Article in journal (Refereed) Published
Abstract [en]

The advance of miniaturized and low-power electronics has a striking impact on the development of energy storage devices with constantly tougher constraints in terms of form factor and performance. Microsupercapacitors (MSCs) are considered a potential solution to this problem, thanks to their compact device structure. Great efforts have been made to maximize their performance with new materials like graphene and to minimize their production cost with scalable fabrication processes. In this regard, we developed a full inkjet printing process for the production of all-graphene microsupercapacitors with electrodes based on electrochemically exfoliated graphene and an ultrathin solid-state electrolyte based on nano-graphene oxide. The devices exploit the high ionic conductivity of nano-graphene oxide coupled with the high electrical conductivity of graphene films, yielding areal capacitances of up to 313 mu F cm-2 at 5 mV s-1 and high power densities of up to 4 mW cm-3 with an overall device thickness of only 1 mu m.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-254076 (URN)10.1039/c9nr01427f (DOI)000470697800002 ()31107494 (PubMedID)2-s2.0-85066626832 (Scopus ID)
Note

QC 20190624

Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-08-16Bibliographically approved
Adolfsson, K. H., Golda-Cepa, M., Benyahia Erdal, N., Duch, J., Kotarba, A. & Hakkarainen, M. (2019). Importance of Surface Functionalities for Antibacterial Properties of Carbon Spheres. Advanced Sustainable Systems
Open this publication in new window or tab >>Importance of Surface Functionalities for Antibacterial Properties of Carbon Spheres
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2019 (English)In: Advanced Sustainable Systems, ISSN 2366-7486Article in journal (Refereed) Published
Abstract [en]

Carbon spheres (CS) are interesting materials for antibacterial applications. Herein, CS are produced by a green process utilizing microwave-assisted hydrothermal treatment of cellulose. The CS are then postmodified in acidic and basic solutions to evaluate the influence of different functionalities on antibacterial properties. CS contain OH/COOH, C Symbol of the Klingon Empire C, and C Symbol of the Klingon Empire O functionalities, while O-CS produced by acid treatment of CS have additional COOH, and NH/NH2 groups, resulting in carbon spheres with negatively and positively charged groups in dispersion. Treatment with base (Na-CS) removes low molecular weight species with oxygen and results in carbon spheres with the highest C/O ratio. CS, O-CS, and Na-CS have nonporous morphology and are in micro/nanometer sizes, although, smaller sized spheres, hollow spheres, and fragments are also attained in the case of O-CS. O-CS show antibacterial activity toward both Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Pseudomonas aeruginosa (P. aeruginosa). The minimum inhibitory concentration is 200 and 400 mu g mL(-1) for S. aureus and P. aeruginosa, respectively, and is achieved only after 3 h of incubation. Neither CS nor Na-CS exhibit antibacterial activity. The antibacterial activity is suggested to originate from electrostatic interactions between O-CS and the bacteria.

Keywords
antibacterial; carbon spheres; carbonization; electrostatic interactions; microwaves; surface functionality
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-248712 (URN)10.1002/adsu.201800148 (DOI)000465001800001 ()
Note

QC 20190514

Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-05-14Bibliographically approved
Adolfsson, K. H., Golda-Cepa, M., Benyahia Erdal, N., Duch, J., Kotarba, A. & Hakkarainen, M. (2019). Importance of Surface Functionalities for Antibacterial Properties of Carbon Spheres. ADVANCED SUSTAINABLE SYSTEMS, 3(4), Article ID 1800148.
Open this publication in new window or tab >>Importance of Surface Functionalities for Antibacterial Properties of Carbon Spheres
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2019 (English)In: ADVANCED SUSTAINABLE SYSTEMS, ISSN 2366-7486, Vol. 3, no 4, article id 1800148Article in journal (Refereed) Published
Abstract [en]

Carbon spheres (CS) are interesting materials for antibacterial applications. Herein, CS are produced by a green process utilizing microwave-assisted hydrothermal treatment of cellulose. The CS are then postmodified in acidic and basic solutions to evaluate the influence of different functionalities on antibacterial properties. CS contain OH/COOH, C Symbol of the Klingon Empire C, and C Symbol of the Klingon Empire O functionalities, while O-CS produced by acid treatment of CS have additional COOH, and NH/NH2 groups, resulting in carbon spheres with negatively and positively charged groups in dispersion. Treatment with base (Na-CS) removes low molecular weight species with oxygen and results in carbon spheres with the highest C/O ratio. CS, O-CS, and Na-CS have nonporous morphology and are in micro/nanometer sizes, although, smaller sized spheres, hollow spheres, and fragments are also attained in the case of O-CS. O-CS show antibacterial activity toward both Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Pseudomonas aeruginosa (P. aeruginosa). The minimum inhibitory concentration is 200 and 400 mu g mL(-1) for S. aureus and P. aeruginosa, respectively, and is achieved only after 3 h of incubation. Neither CS nor Na-CS exhibit antibacterial activity. The antibacterial activity is suggested to originate from electrostatic interactions between O-CS and the bacteria.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH, 2019
Keywords
antibacterial, carbon spheres, carbonization, electrostatic interactions, microwaves, surface functionality
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-251331 (URN)10.1002/adsu.201800148 (DOI)000465001800001 ()
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically approved
Benyahia Erdal, N., Adolfsson, K. H., Pettersson, T. & Hakkarainen, M. (2018). Green Strategy to Reduced Nanographene Oxide through Microwave Assisted Transformation of Cellulose. ACS Sustainable Chemistry and Engineering, 6(1), 1245-1255
Open this publication in new window or tab >>Green Strategy to Reduced Nanographene Oxide through Microwave Assisted Transformation of Cellulose
2018 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 6, no 1, p. 1245-1255Article in journal (Refereed) Published
Abstract [en]

A green strategy for fabrication of biobased reduced nanographene oxide (r-nGO) was developed. Cellulose derived nanographene oxide (nGO) type carbon nanodots were reduced by microwave assisted hydrothermal treatment with superheated water alone or in the presence of caffeic acid (CA), a green reducing agent. The carbon nanodots, r-nGO and r-nGO-CA, obtained through the two different reaction routes without or with the added reducing agent, were characterized by multiple analytical techniques including FTIR, XPS, Raman, XRD, TGA, TEM, AFM, UV-vis, and DLS to confirm and evaluate the efficiency of the reduction reactions. A significant decrease in oxygen content accompanied by increased number of sp2 hybridized functional groups was confirmed in both cases. The synergistic effect of superheated water and reducing agent resulted in the highest C/O ratio and thermal stability, which also supported a more efficient reduction. Interesting optical properties were detected by fluorescence spectroscopy where nGO, r-nGO, and r-nGO-CA all displayed excitation dependent fluorescence behavior. r-nGO-CA and its precursor nGO were evaluated toward osteoblastic cells MG-63 and exhibited nontoxic behavior up to 200 μg mL-1, which gives promise for utilization in biomedical applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
Biobased, Biomass, Carbon nanodots, Hydrothermal, Microwave, Reducing agent
National Category
Other Chemical Engineering Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-221151 (URN)10.1021/acssuschemeng.7b03566 (DOI)000419536800131 ()2-s2.0-85040200237 (Scopus ID)
Note

QC 20180115

Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-06-25Bibliographically approved
Adolfsson, K. H., Lin, C.-f. & Hakkarainen, M. (2018). Microwave Assisted Hydrothermal Carbonization and Solid State Postmodification of Carbonized Polypropylene. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 6(8), 11105-11114
Open this publication in new window or tab >>Microwave Assisted Hydrothermal Carbonization and Solid State Postmodification of Carbonized Polypropylene
2018 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 6, no 8, p. 11105-11114Article in journal (Refereed) Published
Abstract [en]

Functional carbon materials produced through a hydrothermal treatment of waste products have gained interest. Particularly, the method is considered more facile and green compared to conventional decomposition methods. Here, we demonstrated an upcycling of polypropylene (PP) waste to carbon materials by a microwave assisted hydro thermal treatment. The solid product obtained from the hydrothermal treatment was analyzed by multiple techniques to reveal the structure and the influence of processing conditions on PP degradation and hydrothermal carbonization. Chemical analyses showed the presence of carbonaceous material independent of acid amount (20 and 30 mL), temperature (210 and 250 degrees C), and time (20-80 min). A complete transformation of PP content to amorphous carbon required 60 min at 250 degrees C. The mass yield of the solid product decreased as a function of harsher processing conditions. At the same time, thermogravimetric analysis illustrated products with increasing thermal stability and a larger amount of remaining residue at 600 degrees C. The solid products consisted of irregular fragments and sheet-like structures. A solid state microwave process in air atmosphere was performed on a product with incomplete carbonization. The modification resulted in a decreased C/O ratio, and TGA analysis in nitrogen showed high thermal stability and degree of carbonization as indicated by the remaining residue of 86.4% at 600 degrees C. The new insights provided on the hydrothermal carbonization, and postmodification in air atmosphere, can catalyze effective handling of plastic waste by enabling transformation of low quality waste into functional carbon materials.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
Keywords
Plastic waste, Polypropylene, Microwave, Hydrothermal, Hydrochar, Carbonization
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-234193 (URN)10.1021/acssuschemeng.8b02580 (DOI)000441475500170 ()2-s2.0-85049957721 (Scopus ID)
Note

QC 20181001

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2019-04-10Bibliographically approved
Gazzotti, S., Hakkarainen, M., Adolfsson, K. H., Ortenzi, M. A., Farina, H., Lesma, G. & Silvani, A. (2018). One-Pot Synthesis of Sustainable High-Performance Thermoset by Exploiting Eugenol Functionalized 1,3-Dioxolan-4-one. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 6(11), 15201-15211
Open this publication in new window or tab >>One-Pot Synthesis of Sustainable High-Performance Thermoset by Exploiting Eugenol Functionalized 1,3-Dioxolan-4-one
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2018 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 6, no 11, p. 15201-15211Article in journal (Refereed) Published
Abstract [en]

1,3-Dioxolan-4-one (DOX) chemistry was explored for production of "one-pot" biobased polyester thermosets. DOX monomer was first functionalized by naturally occurring eugenol to introduce a structural element, which could induce cross-linking reaction through cationic polymerization of the double bond. The feasibility of polymerizing DOX monomers bearing bulky side groups was proven by model phenol-substituted DOX monomer (PhDOX). Once the reaction was shown to be effective, the same protocol was applied to eugenol-substituted monomer (EuDOX). A brief screening of the optimal catalyst concentration was performed, to obtain a highly cross-linked product. The synthesized thermoset showed good thermal resistance and high mechanical strength probably due to the rich aromatic content. The obtained thermoset was further subjected to microwave-assisted hydrothermal degradation test, which demonstrated complete recyclability to water or methanol soluble products. NMR and matrix-assisted laser desorption/ionization-mass spectroscopy analyses of the obtained degradation products unveiled the structure of the thermoset, strongly indicating that the polymerization of eugenol-functionalized DOX monomer resulted in polylactide-like chains connected with aromatic aliphatic segments resulting from the reaction of the eugenol double bonds. The presence of free hydroxyl and carboxyl groups sheds light on the mechanism behind the observed shape-memory and self-healing properties.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
Keywords
DOX, Biobased, Thermoset, PLA, Eugenol
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-239787 (URN)10.1021/acssuschemeng.8b03655 (DOI)000449577200173 ()2-s2.0-85055160019 (Scopus ID)
Note

QC 20190108

Available from: 2019-01-08 Created: 2019-01-08 Last updated: 2019-01-08Bibliographically approved
Xu, H., Wu, D., Yang, X., Feng, Z., Adolfsson, K. H., Xie, L. & Hakkarainen, M. (2016). Enhancing the function of graphene oxide nanosheets by crystallization control: Unexpected harvest of strength, ductility and thermal stability for poly(lactic acid) barrier films. Abstracts of Papers of the American Chemical Society, 251
Open this publication in new window or tab >>Enhancing the function of graphene oxide nanosheets by crystallization control: Unexpected harvest of strength, ductility and thermal stability for poly(lactic acid) barrier films
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2016 (English)In: Abstracts of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 251Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2016
National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-242706 (URN)000431903802274 ()
Note

QC 20190220

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-08-21Bibliographically approved
Benyahia Erdal, N., Adolfsson, K. H. & Hakkarainen, M. (2016). Silicone-hydrogel bandage lenses used in conjunction with pharmaceutical eye drops: An uptake and release study. Abstract of Papers of the American Chemical Society, 251
Open this publication in new window or tab >>Silicone-hydrogel bandage lenses used in conjunction with pharmaceutical eye drops: An uptake and release study
2016 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 251Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2016
National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-242675 (URN)000431905706182 ()
Note

QC 20190222

Available from: 2019-02-22 Created: 2019-02-22 Last updated: 2019-02-22Bibliographically approved
Adolfsson, K. H., Hassanzadeh, S. & Hakkarainen, M. (2016). Value-added carbon products attained through microwave assisted hydrothermal treatment of cellulose and waste paper. Abstract of Papers of the American Chemical Society, 251
Open this publication in new window or tab >>Value-added carbon products attained through microwave assisted hydrothermal treatment of cellulose and waste paper
2016 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 251Article in journal, Meeting abstract (Other academic) Published
Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2016
National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-242663 (URN)000431903802484 ()
Note

QC 20190225

Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2019-02-25Bibliographically approved
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