SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Elihn K) "

Sökning: WFRF:(Elihn K)

  • Resultat 1-10 av 10
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Midander, K., et al. (författare)
  • Surface characteristics, copper release and toxicity of nano- and micron sized copper and copper(II)oxide particles : A cross-disciplinary study
  • 2009
  • Ingår i: Small (Weinheim an der Bergstrasse, Germany). - : Wiley. - 1613-6810 .- 1613-6829. ; 5:3, s. 389-399
  • Tidskriftsartikel (refereegranskat)abstract
    • An interdisciplinary and multianalytical research effort is undertaken to assess the toxic aspects of thoroughly characterized nano- and micrometer-sized particles of oxidized metallic copper and copper(II) oxide in contact with cultivated lung cells, as well as copper release in relevant media. All particles, except micrometer-sized Cu, release more copper in serum-containing cell medium (supplemented Dulbecco's minimal essential medium) compared to identical exposures in phosphate-buffered saline. Sonication of particles for dispersion prior to exposure has a large effect on the initial copper release from Cu nanoparticles. A clear size-dependent effect is observed from both a copper release and a toxicity perspective. In agreement with greater released amounts of copper per quantity of particles from the nanometer-sized particles compared to the micrometer-sized particles, the nanometer particles cause a higher degree of DNA damage (single-strand breaks) and cause a significantly higher percentage of cell death compared to cytotoxicity induced by micrometer-sized particles. Cytotoxic effects related to the released copper fraction are found to be significantly lower than the effects related to particles. No DNA damage is induced by the released copper fraction.
  •  
2.
  • Andersson, Margaretha, et al. (författare)
  • Surface attachment of nanoparticles using oligonucleotides
  • 2004
  • Ingår i: Colloids and Surfaces B: Biointerfaces. ; 34, s. 165-171
  • Tidskriftsartikel (refereegranskat)abstract
    • Colloidal polymer particles are widely used in a variety of applications ranging from chromatography to surface modified bioreactors in protein arrays. In the present study, surface attachment of polystyrene particles to a polystyrene substrate has been p
  •  
3.
  •  
4.
  • Elihn, K, et al. (författare)
  • Nanoparticle formation by laser-assisted photolysis of ferrocene.
  • 1999
  • Ingår i: NANOSTRUCTURED MATERIALS. - 0965-9773. ; 12:1-4, s. 79-82
  • Tidskriftsartikel (refereegranskat)abstract
    • Laser-assisted formation of iron-containing nanoparticles has been performed by photolytic dissociation of ferrocene vapour by a pulsed ArF excimer laser at 193 nm. The process was carried out at atmospheric pressure, either in an inert atmosphere of argo
  •  
5.
  • Heszler, P, et al. (författare)
  • Formation and emission spectroscopy of laser-generated nanoparticles
  • 2002
  • Ingår i: Smart materials and structures. - : IOP Publishing. - 0964-1726 .- 1361-665X. ; 11, s. 631-639
  • Tidskriftsartikel (refereegranskat)abstract
    • Fe nanoparticles, with both fcc and bcc structures and with a C shell that protects against oxidation, were generated by the laser-assisted photolytic chemical vapor decomposition of ferrocene (FeCp2). Amorphous W and WN0,3 nanoparticles were formed by laser ablation (LA) of solid W in Ar and in N2 ambient, respectively. Laser-assisted chemical vapor deposition of W yielded crystalline W nanoparticles (β phase) from a WF6/H2/Ar gas mixture. ArF excimer laser was used as the radiation source in all the experiments. Measurements and analysis of the emitted blackbody-like radiation from the laser heated particles were performed and dominant cooling processes such as evaporation and heat transfer by the ambient gases were identified. The particles could be heated up to the boiling and melting point of Fe and W, respectively. Lognormal particle size distributions were found for Fe/C and W nanoparticles generated by vapor decomposition or deposition processes respectively, and then modeled at low particle concentration (with no coagulation). The thickness of the C shell was practically independent of the laser fluence, while the size of the Fe core could be varied for the Fe/C particles. The LA yielded no lognormal-type distribution for the amorphous WN0,3 particles.
  •  
6.
  • Heszler, Peter, et al. (författare)
  • Optical characterisation of the photolytic decomposition of ferrocene into nanoparticles
  • 2000
  • Ingår i: Applied Physics A. ; 70, s. 613-616
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract. Optical emission from the photolytic dissociation of ferrocene Fe(C5H5)2, often abbreviated as FeCp2, in argon atmosphere was studied. The dissociation was performed by using an ArF excimer laser, operating at a wavelength of 193 nm. Two pressure regions were examined. At low (0.1 mbar) pressure, several emission lines of Fe could be identified, however no C, C2, or CH emission lines/bands were found. At a higher (20 mbar) pressure of the FeCp2/Ar gas mixture, a broadband emission identified as blackbody radiation was observed. This blackbody radiation originates from nanoparticles with a mean size of 30 nm, which consist of both metallic iron and amorphous carbon. The initial colour temperature of the particles was 2600 K.
  •  
7.
  •  
8.
  •  
9.
  • Landström, Lars, et al. (författare)
  • Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene
  • 2005
  • Ingår i: Applied Physics A. - : Springer Science and Business Media LLC. - 1432-0630 .- 0947-8396. ; 81, s. 827-833
  • Tidskriftsartikel (refereegranskat)abstract
    • Thermal radiation, originating from laser-heated gas-phase nanoparticles, was detected in the 400–700 nm wavelength range by means of optical emission spectroscopy. The particles were formed upon laser-induced photolytic decomposition of ferrocene (Fe(C5H5)2) and consisted of an iron core surrounded by a carbon shell. The laser-induced excitation was performed as the particles were still within the reactor zone, and the temperature of the particles could be determined from thermal emission. Both the temperature of the nanoparticles and the relative intensity changes of the emission were monitored as a function of time (with respect to the laser pulse), laser fluence and Ar ambient pressure. At high laser fluences, the particles reached high temperatures, and evidence was found for boiling of iron. Modeling of possible energy-releasing mechanisms such as black-body radiation, thermionic electron emission, evaporation and heat transfer by the ambient gas was also performed. The dominant cooling mechanisms at different ranges of temperature were clarified, together with a determination of the accommodation factor for the Ar–nanoparticle collisions. The strong evaporation at elevated temperatures also led to significant iron loss from the produced particles.
  •  
10.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 10

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy