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Publications (10 of 20) Show all publications
Doddapaneni, V., Zhao, Y., Ye, F., Gati, R., Edin, H. & Toprak, M. S. (2015). Improving Uv Radiation Absorption by Copper Oxide NPs/PMMA Nanocomposites for Electrical Switching Applications. Powder metallurgy and metal ceramics, 54(7-8), 397-401
Open this publication in new window or tab >>Improving Uv Radiation Absorption by Copper Oxide NPs/PMMA Nanocomposites for Electrical Switching Applications
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2015 (English)In: Powder metallurgy and metal ceramics, ISSN 1068-1302, E-ISSN 1573-9066, Vol. 54, no 7-8, p. 397-401Article in journal (Refereed) Published
Abstract [en]

Nanocomposites based on the radiation absorbing polymer (PNCs) are of interest for a variety of applications including circuit breakers, UV-shielding windows, contact lenses, and glasses among others. Such PNCs can be made by incorporating suitable radiation absorbing nanoparticles into a polymeric matrix by in situ polymerization. In this study, spherical nanoparticles (5-6 nm) of oleic acid (OA) surface modified cupric oxide (CuO) are synthesized and used to improve the ultra-violet (UV) radiation absorption property of a polymer matrix, i.e., polymethylmethacrylate (PMMA). The synthesis of spherical CuO nanoparticles, surface modification using OA, dispersion of CuO nanoparticles with different concentrations in PMMA, and UV radiation absorption property of the resultant PNC are investigated. Two different PNCs are produced using OA modified CuO nanoparticles with different concentrations. As synthesized CuO nanoparticles and OA modified CuO nanoparticles are examined by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) techniques. The UV absorption edges are evaluated from the UV-Vis absorption spectra by using UV-Visible absorption spectroscopy. The results show that the UV radiation absorption of the PNC with higher concentration of CuO nanoparticles is improved compared with PMMA and the absorption edge moved towards longer wavelengths i.e., from 271 to 281 nm. These PNCs are successful in arc interruption process by absorbing a broad range of radiation emitted from high-energy copper arcs produced in the circuit breakers.

Place, publisher, year, edition, pages
Springer, 2015
Keywords
polymer-based nanocomposites, cupric oxide, UV-absorption, nanoparticles, circuit breaker
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-180142 (URN)10.1007/s11106-015-9728-1 (DOI)000366156700003 ()2-s2.0-84957429698 (Scopus ID)
Note

QC 20160113

Available from: 2016-01-13 Created: 2016-01-07 Last updated: 2017-11-30Bibliographically approved
Vasileva, E., Fei, Y., Marinins, A., Etcheverry, S., Toprak, M. & Popov, S. Y. (2015). Optimization of optical gain in composite materials containing Rh6G dye and gold nanoparticles. In: Asia Communications and Photonics Conference, ACPC 2015: . Paper presented at Asia Communications and Photonics Conference, ACPC 2015, 19 November 2015 through 23 November 2015.
Open this publication in new window or tab >>Optimization of optical gain in composite materials containing Rh6G dye and gold nanoparticles
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2015 (English)In: Asia Communications and Photonics Conference, ACPC 2015, 2015Conference paper, Published paper (Refereed)
Abstract [en]

The existence of metal nanoparticles in a dye material can lead not only to quenching or enhancement of dye luminescence, or random lasing action, but also to the change of the fundamental material characteristic as optical gain. © 2015 OSA.

National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-195162 (URN)2-s2.0-84971656710 (Scopus ID)9781943580064 (ISBN)
Conference
Asia Communications and Photonics Conference, ACPC 2015, 19 November 2015 through 23 November 2015
Note

Conference Paper. QC 20161108

Available from: 2016-11-08 Created: 2016-11-02 Last updated: 2016-11-08Bibliographically approved
Andõn, F. T., Kapralov, A. A., Yanamala, N., Feng, W., Baygan, A., Chambers, B. J., . . . Kagan, V. E. (2013). Biodegradation of Single-Walled Carbon Nanotubes by Eosinophil Peroxidase. Small, 9(16), 2721-2729
Open this publication in new window or tab >>Biodegradation of Single-Walled Carbon Nanotubes by Eosinophil Peroxidase
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2013 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 9, no 16, p. 2721-2729Article in journal (Refereed) Published
Abstract [en]

Eosinophil peroxidase (EPO) is one of the major oxidant-producing enzymes during inflammatory states in the human lung. The degradation of single-walled carbon nanotubes (SWCNTs) upon incubation with human EPO and H2O 2 is reported. Biodegradation of SWCNTs is higher in the presence of NaBr, but neither EPO alone nor H2O2 alone caused the degradation of nanotubes. Molecular modeling reveals two binding sites for SWCNTs on EPO, one located at the proximal side (same side as the catalytic site) and the other on the distal side of EPO. The oxidized groups on SWCNTs in both cases are stabilized by electrostatic interactions with positively charged residues. Biodegradation of SWCNTs can also be executed in an ex vivo culture system using primary murine eosinophils stimulated to undergo degranulation. Biodegradation is proven by a range of methods including transmission electron microscopy, UV-visible-NIR spectroscopy, Raman spectroscopy, and confocal Raman imaging. Thus, human EPO (in vitro) and ex vivo activated eosinophils mediate biodegradation of SWCNTs: an observation that is relevant to pulmonary responses to these materials. Human eosinophil peroxidase (EPO) is able to degrade SWCNTs in vitro in the presence of H2O2. EPO is one of the major oxidant-generating enzymes present in human lungs during inflammatory states. The biodegradation of SWCNTs is evidenced also in an ex vivo culture system using primary murine eosinophils stimulated to undergo degranulation. These results are relevant to potential respiratory exposure to carbon nanotubes.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2013
Keywords
biodegradable materials, carbon nanotubes, eosinophil peroxidase, molecular modeling, Biodegra-dable materials, Catalytic sites, Confocal Raman imaging, Culture systems, Oxidized groups, Positively charged, Single-walled carbon nanotube (SWCNTs), Enzymes, Microbiology, Near infrared spectroscopy, Oxidants, Respiratory system, Single-walled carbon nanotubes (SWCN), Transmission electron microscopy, Biodegradation
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:kth:diva-133837 (URN)10.1002/smll.201202508 (DOI)000327738600011 ()2-s2.0-84879786954 (Scopus ID)
Funder
FormasEU, FP7, Seventh Framework Programme, 263215
Note

QC 20131113

Available from: 2013-11-13 Created: 2013-11-11 Last updated: 2017-12-06Bibliographically approved
Barrefelt, Å., Saghafian, M., Kuiper, R., Ye, F., Egri, G., Klickermann, M., . . . Hassan, M. (2013). Biodistribution, kinetics, and biological fate of SPION microbubbles in the rat. International Journal of Nanomedicine, 8, 3241-3254
Open this publication in new window or tab >>Biodistribution, kinetics, and biological fate of SPION microbubbles in the rat
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2013 (English)In: International Journal of Nanomedicine, ISSN 1176-9114, E-ISSN 1178-2013, Vol. 8, p. 3241-3254Article in journal (Refereed) Published
Abstract [en]

Background: In the present investigation, we studied the kinetics and biodistribution of a contrast agent consisting of poly(vinyl alcohol) (PVA) microbubbles containing superparamagnetic iron oxide (SPION) trapped between the PVA layers (SPION microbubbles). Methods: The biological fate of SPION microbubbles was determined in Sprague-Dawley rats after intravenous administration. Biodistribution and elimination of the microbubbles were studied in rats using magnetic resonance imaging for a period of 6 weeks. The rats were sacrificed and perfusion-fixated at different time points. The magnetic resonance imaging results obtained were compared with histopathologic findings in different organs. Results: SPION microbubbles could be detected in the liver using magnetic resonance imaging as early as 10 minutes post injection. The maximum signal was detected between 24 hours and one week post injection. Histopathology showed the presence of clustered SPION microbubbles predominantly in the lungs from the first time point investigated (10 minutes). The frequency of microbubbles declined in the pulmonary vasculature and increased in pulmonary, hepatic, and splenic macrophages over time, resulting in a relative shift from the lungs to the spleen and liver. Meanwhile, macrophages showed increasing signs of cytoplasmic iron accumulation, initially in the lungs, then followed by other organs. Conclusion: The present investigation highlights the biological behavior of SPION microbubbles, including organ distribution over time and indications for biodegradation. The present results are essential for developing SPION microbubbles as a potential contrast agent and/or a drug delivery vehicle for specific organs. Such a vehicle will facilitate the use of multimodality imaging techniques, including ultrasound, magnetic resonance imaging, and single positron emission computed tomography, and hence improve diagnostics, therapy, and the ability to monitor the efficacy of treatment.

Keywords
biodistribution, microbubbles, superparamagnetic iron oxide, pharmacokinetics, magnetic resonance imaging, histopathology
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-127786 (URN)10.2147/IJN.S49948 (DOI)000323410400001 ()2-s2.0-84883180976 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme
Note

QC 20130906

Available from: 2013-09-06 Created: 2013-09-05 Last updated: 2017-12-06Bibliographically approved
Li, J., Ye, F., Vaziri, S., Muhammed, M., Lemme, M. C. & Östling, M. (2013). Efficient inkjet printing of graphene. Advanced Materials, 25(29), 3985-3992
Open this publication in new window or tab >>Efficient inkjet printing of graphene
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2013 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 25, no 29, p. 3985-3992Article in journal (Refereed) Published
Abstract [en]

An efficient and mature inkjet printing technology is introduced for mass production of coffee-ring-free patterns of high-quality graphene at high resolution (unmarked scale bars are 100 μm). Typically, several passes of printing and a simple baking allow fabricating a variety of good-performance electronic devices, including transparent conductors, embedded resistors, thin film transistors, and micro-supercapacitors.

Keywords
graphene, inkjet printing, micro-supercapacitors, thin film transistors, transparent conductors
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-134046 (URN)10.1002/adma.201300361 (DOI)000327692400009 ()2-s2.0-84881156476 (Scopus ID)
Funder
EU, European Research Council, 228229
Note

QC 20131118

Available from: 2013-11-18 Created: 2013-11-15 Last updated: 2017-12-06Bibliographically approved
Dai, J., Ye, F., Chen, Y., Muhammed, M., Qiu, M. & Yan, M. (2013). Light absorber based on nano-spheres on a substrate reflector. Optics Express, 21(6), 6697-6706
Open this publication in new window or tab >>Light absorber based on nano-spheres on a substrate reflector
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2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 6, p. 6697-6706Article in journal (Refereed) Published
Abstract [en]

We systematically study a type of plasmonic light absorber based on a monolayer of gold nano-spheres with less than 30 nm in diameters deposited on top of a continuous gold substrate. The influences of particle size, inter-particle distance, particle-substrate spacer size etc on the resonance are studied thoroughly with a 3D finite-element method. We identified that the high-absorption resonance is mainly due to gap plasmon (coupled through particle bodies) when the separation between neighboring nano-spheres is small enough, such as close to 1 nm; at larger particle separations, the resonance is dominated by particle dipoles (coupled through the host dielectric). Experimentally, an absorber was fabricated based on chemically-synthesized gold nanoparticles coated with silica shell. The absorber shows a characteristic absorption band around 810 nm with a maximum absorbance of approximately 90%, which agrees reasonably well with our numerical calculation. The fabrication technique can be easily adapted for devising efficient light absorbers of large areas.

Keywords
Plasmonic Nanostructures, Perfect Absorber, Nanoparticles, Metamaterials, Enhancement, Devices
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-122118 (URN)10.1364/OE.21.006697 (DOI)000316796000006 ()2-s2.0-84875754313 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20130514

Available from: 2013-05-14 Created: 2013-05-13 Last updated: 2017-12-06Bibliographically approved
Li, J., Ye, F., Vaziri, S., Muhammed, M., Lemme, M. C. & Östling, M. (2012). A simple route towards high-concentration surfactant-free graphene dispersions. Carbon, 50(8), 3113-3116
Open this publication in new window or tab >>A simple route towards high-concentration surfactant-free graphene dispersions
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2012 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 50, no 8, p. 3113-3116Article in journal (Refereed) Published
Abstract [en]

A simple solvent exchange method is introduced to prepare high-concentration and surfactant-free graphene liquid dispersion. Natural graphite flakes are first exfoliated into graphene in dimethylformamide (DMF). DMF is then exchanged by terpineol through distillation, relying on their large difference in boiling points. Graphene can then be concentrated thanks to the volume difference between DMF and terpineol. The concentrated graphene dispersions are used to fabricate transparent conductive thin films, which possess comparable properties to those prepared by more complex methods.

Keywords
Complex methods, Liquid dispersions, Natural graphite, Solvent exchanges, Surfactant-free, Transparent conductive thin films, Volume difference, Dimethylformamide, Dispersions, Distillation, Organic solvents, Graphene
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-95714 (URN)10.1016/j.carbon.2012.03.011 (DOI)000303616700057 ()2-s2.0-84862812408 (Scopus ID)
Funder
StandUp
Note

QC 20120529

Available from: 2012-05-29 Created: 2012-05-29 Last updated: 2017-12-07Bibliographically approved
Ye, F. (2012). Chemically Synthesized Nano-Structured Materials for Biomedical and Photonic Applications. (Doctoral dissertation). Stockholm: KTH Royal Institute of Technology
Open this publication in new window or tab >>Chemically Synthesized Nano-Structured Materials for Biomedical and Photonic Applications
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nanostructured materials have attracted a broad interest for applications in scientific and engineering fields due to their extraordinary properties stemming from the nanoscale dimensions. This dissertation presents the development of nanomaterials used for different applications, namely biomedicine and dye lasing.

Various inorganic nanoparticles have been developed as contrast agents for non-invasive medical imaging, such as magnetic resonance imaging (MRI) and X-ray computed tomography (CT), owing to their unique properties for efficient contrasting effect. Superparamagnetic iron oxide nanoparticles (SPIONs) are synthesized by thermo-decomposition method and phase-transferred to be hydrophilic used as MRI T2 (negative) contrast agents. Effects of surface modification of SPIONs by mesoporous silica (mSiO2) coating have been examined on the magnetic relaxivities. These contrast agents (Fe3O4@mSiO2) were found to have a coating-thickness dependent relaxation behavior and exhibit much higher contrast efficiency than that for the commercial ones. By growing thermo-sensitive poly(N-isopropylacrylamide -co-acrylamide) (P(NIPAAm-co-AAm)) as the outermost layer on Fe3O4@mSiO2 through free radical polymerization, a multifunctional core-shell nano-composite has been built up. Responding to the temperature change, these particles demonstrate phase transition behavior and were used for thermo-triggered magnetic separation. Their lower critical solution temperature (LCST) can be subtly tuned from ca. 34 to ca. 42 ˚C, suitable for further in vivo applications. An all-in-one contrast agent for MRI, CT and fluorescence imaging has been synthesized by depositing gadolinium oxide carbonate hydrate [Gd2O(CO3)2·H2O] shell on mSiO2-coated gold nanorod (Au NR), and then the particles were grafted with antibiofouling copolymer which can further link with the fluorescent dye. It shows both a higher CT and MRI contrast than the clinical iodine and gadolinium chelate contrast agent, respectively. Apart from the imaging application, owing to the morphology of Au NR, the particle has a plasmonic property of absorbing near-infrared (NIR) irradiation and suitable for future photothermal therapy. Cytotoxicity and biocompatibility of aforementioned nanoparticles have been evaluated and minor negative effects were found, which support their further development for medical applications.

Gold nanoparticles embedded in the optical gain material, water solution of Rhodamine 6G (Rh6G) in particular, used in dye lasers can both increase and damp the dye fluorescence, thus, changing the laser output intensity. The studies of size effect and coating of gold nanoparticles on photostability of the gain media reveal that small sized (ca. 5.5 nm) gold nanoparticles are found detrimental to the photostability, while for the larger ones (ca. 25 nm) fluorescence enhancement rather than quenching is likely to occur. And a noticeable improvement of the photostability for the gain material is achieved when gold is coated with SiO2.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. p. xii, 45
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2012:12
National Category
Nano Technology
Identifiers
urn:nbn:se:kth:diva-96261 (URN)
Public defence
2012-06-12, Sal/Hall C2, Electrum, KTH-ICT, Isafjordsgatan 26, Kista, 10:00 (English)
Opponent
Supervisors
Note
QC 20120605Available from: 2012-06-05 Created: 2012-05-31 Last updated: 2012-06-05Bibliographically approved
Dong, L., Ye, F., Chughtai, A., Popov, S., Friberg, A. T. & Muhammed, M. (2012). Enhanced photostability of aqueous solution of Rhodamine 6G with gold nanoparticles in lasing process by silica coating. In: 2012 Conference on Lasers and Electro-Optics, CLEO 2012. Paper presented at 2012 Conference on Lasers and Electro-Optics, CLEO 2012, 6 May 2012 through 11 May 2012, San Jose, CA (pp. 6325399). IEEE
Open this publication in new window or tab >>Enhanced photostability of aqueous solution of Rhodamine 6G with gold nanoparticles in lasing process by silica coating
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2012 (English)In: 2012 Conference on Lasers and Electro-Optics, CLEO 2012, IEEE , 2012, p. 6325399-Conference paper, Published paper (Refereed)
Abstract [en]

Gold nanoparticles are mixed in aqueous solution of Rhodamine 6G to modify the lasing output intensity. The photostability deterioration of the gain medium by gold nanoparticles is successfully compensated by silica coating on the nanoparticles.

Place, publisher, year, edition, pages
IEEE, 2012
Keywords
Gain medium, Gold Nanoparticles, Output intensity, Photo-stability, Rhodamine 6G, Silica coatings
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-111831 (URN)000310362400043 ()2-s2.0-84870377025 (Scopus ID)978-146731839-6 (ISBN)
Conference
2012 Conference on Lasers and Electro-Optics, CLEO 2012, 6 May 2012 through 11 May 2012, San Jose, CA
Note

QC 20130114

Available from: 2013-01-14 Created: 2013-01-14 Last updated: 2013-03-21Bibliographically approved
Ye, F., Brismar, T., Shi, J., Lin, D., Sayed, R. E., Popov, S., . . . Muhammed, M. (2012). Gold nanorod/mesoporoussilica/gadolinium oxide carbonate hydrate core/shell nanoparticles: A multimodalcontrast agent for MRI, CT and fluorescence imaging.
Open this publication in new window or tab >>Gold nanorod/mesoporoussilica/gadolinium oxide carbonate hydrate core/shell nanoparticles: A multimodalcontrast agent for MRI, CT and fluorescence imaging
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2012 (English)Manuscript (preprint) (Other academic)
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-96495 (URN)
Note
QS 2012Available from: 2012-06-05 Created: 2012-06-05 Last updated: 2012-06-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1679-1316

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