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Importance of Surface Functionalities for Antibacterial Properties of Carbon Spheres
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
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2019 (Engelska)Ingår i: Advanced Sustainable Systems, ISSN 2366-7486Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2019.
Nyckelord [en]
antibacterial; carbon spheres; carbonization; electrostatic interactions; microwaves; surface functionality
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:kth:diva-248712DOI: 10.1002/adsu.201800148ISI: 000465001800001OAI: oai:DiVA.org:kth-248712DiVA, id: diva2:1303508
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QC 20190514

Tillgänglig från: 2019-04-09 Skapad: 2019-04-09 Senast uppdaterad: 2019-05-14Bibliografiskt granskad
Ingår i avhandling
1. Hydrothermal recycling of natural and synthetic polymers to functional carbon materials
Öppna denna publikation i ny flik eller fönster >>Hydrothermal recycling of natural and synthetic polymers to functional carbon materials
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Utilizing renewable recourses and waste recycling are necessary for reaching a circular resource society. The concept of this thesis was to set up a sustainable recycling route, suitable even for low quality biopolymer and plastic waste for production of functional carbon materials. Carbonaceous materials were prepared by mild hydrothermal carbonizations of cellulose and polypropylene (PP) under acidic conditions. The carbonization of cellulose resulted mainly in micro-/nanometer sized carbon spheres (CS) with polar functionalities. After carbonization of PP, products were found in solid and liquid phase. Completely carbonized solid carbons products were obtained from PP at 250 °C after 60 min. The liquid products from the same process displayed aromatics and exhibited fluorescence properties. In addition, new carbon materials were prepared by acid, base and thermal treatments of the carbonized products at low temperatures. Thermally resistant carbon products and antibacterial CS towards both Staphylococcus aureus and Pseudomonas aeruginosa were demonstrated as possible applications for these products. The minimum inhibitory concentrations of CS were 200-400 µg mL-1 depending on the bacteria strain and reached after only 3 h. Furthermore, nanometer sized carbon nanodots with high oxygenation degree and fluorescence properties were derived together with carbon flakes (CF) from the carbonized products. The CF with flat and micrometer sized morphology and polar groups were utilized for coating of cationized cellulose filters, applied as adsorbents and then subsequently as surfaces for SALDI-MS analysis of environmental contaminants. This work contributes with new routes to and applications for functional carbon materials.

Ort, förlag, år, upplaga, sidor
KTH Royal Institute of Technology, 2019. s. 75
Serie
TRITA-CBH-FOU ; 2019:18
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:kth:diva-248720 (URN)978-91-7873-156-5 (ISBN)
Disputation
2019-05-09, sal F3, Lindstedtsvägen 26, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20190411

Tillgänglig från: 2019-04-11 Skapad: 2019-04-10 Senast uppdaterad: 2019-04-23Bibliografiskt granskad

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Adolfsson, Karin H.Benyahia Erdal, NejlaHakkarainen, Minna

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