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  • 1
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    Analysis of biogenic magnetite nanoparticles (2013)
    PANGAEA
    In:  Supplement to: Byrne, James M; Coker, V S; Moise, S; Wincott, P L; Vaughan, D J; Tuna, F; Arenholz, E; van der Laan, G; Pattrick, R A D P; Lloyd, J R; Telling, N D (2013): Controlled cobalt doping in biogenic magnetite nanoparticles. Journal of The Royal Society Interface, 10(83), 20130134-20130134, https://doi.org/10.1098/rsif.2013.0134
    Details
    Publication Date: 2023-01-13
    Description: Cobalt doped magnetite (CoxFe3-xO4) nanoparticles have been produced through the microbial reduction of cobalt-iron oxyhydroxide by the bacterium Geobacter sulfurreducens. The materials produced, as measured by SQUID, x-ray magnetic circular dichroism, Mössbauer spectroscopy, etc., show dramatic increases in coercivity with increasing cobalt content without a major decrease in overall saturation magnetization. Structural and magnetization analyses reveal a reduction in particle size to 〈4 nm at the highest Co content, combined with an increase in the effective anisotropy of the magnetic nanoparticles. The potential use of these biogenic nanoparticles in aqueous suspensions for magnetic hyperthermia applications is demonstrated. Further analysis of the distribution of cations within the ferrite spinel indicates that the cobalt is predominantly incorporated in octahedral coordination, achieved by the substitution of Fe2+ site with Co2+, with up to 17 per cent Co substituted into tetrahedral sites.
    Type: Dataset
    Format: application/zip, 695.2 kBytes
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    DATA PANGAEA
  • 2
    Electronic Resource
    Electronic Resource
    Single-pulse ultraviolet laser-induced surface modification and ablation of polyimide (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 847-849 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-pulse laser ablation of polyimide was investigated by using focused UV-Ar+-laser radiation (λ(approximate)302 nm, 140 ns≤τl≤50 ms) and atomic force microscopy. The results clearly demonstrate that the ablation rates do not depend on the total dose only, but depend as well on the duration of the laser pulses, τl. The experimental results can be interpreted almost quantitatively on the basis of a purely thermal model. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122021
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum-well states in copper thin films (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 398 (1999), S. 132-134 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A standard exercise in elementary quantum mechanics is to describe the properties of an electron confined in a potential well. The solutions of Schrödinger's equation are electron standing waves—or ‘quantum-well’ states—characterized by the quantum number n, the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/18178
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  • 4
    Electronic Resource
    Electronic Resource
    Laser-induced dendritic structures on PET (polyethylene- terephthalate): the importance of redeposited ablation products (1999)
    Springer
    Applied physics 69 (1999), S. S487 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 42.62; 61.80; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Single-pulse excimer-laser irradiation of poly-ethylene-terephthalate (PET) with fluences around and above the ablation threshold leads to the formation of surface dendrites. The lateral size and the number density of dendrites depend on the laser wavelength and the type and pressure of the ambient atmosphere. The results are discussed on the basis of excimer-laser-induced polymer fragmentation and the redeposition of ablation products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051447
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  • 5
    Electronic Resource
    Electronic Resource
    Particles in laser ablation of polytetrafluoroethylene (1999)
    Springer
    Applied physics 69 (1999), S. S467 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20.Ds; 61.41.+e; 84.37.+i
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. KrF-laser ablation of pressed polytetrafluoroethylene (PTFE) targets is accompanied by the ejection of submicron- to micron-sized particles. Collected ejecta consist of four basic particle morphologies ranging from small particles 50–200 nm in diameter to larger particles ∼10 μm in diameter. Many particles carry electric charge as measured by using charged electrodes and by the Millikan technique. Thin PTFE films deposited by pulsed laser deposition (PLD) from the same targets onto heated Si substrates are highly crystalline and show only a minor but detectable increase of defects compared with the target material. The transferred particulates mainly consist of long PTFE molecule chains. The low molecular weight material that is also transferred to the substrate mainly either links with other low molecular weight material or evaporates during deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051440
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  • 6
    Electronic Resource
    Electronic Resource
    Growth of excimer-laser-induced dendritic surface structures on polyethylene-terephthalate
    Amsterdam : Elsevier
    Applied Surface Science 81 (1994), S. 103-106 
    Details
    ISSN: 0169-4332
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-4332(94)90090-6
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  • 7
    Electronic Resource
    Electronic Resource
    Laser-induced surface modification and structure formation of polymers
    Amsterdam : Elsevier
    Applied Surface Science 69 (1993), S. 16-19 
    Details
    ISSN: 0169-4332
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-4332(93)90475-Q
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  • 8
    Electronic Resource
    Electronic Resource
    Circular dichroism in 4 f photoemission from magnetically ordered rare-earth materials (1995)
    Springer
    Applied physics 60 (1995), S. 179-189 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 75.50.Cc; 78.20.Ls; 79.60.Cn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  4 f Photoemission (PE) spectra from magnetically ordered rare-earth materials using circularly polarized X-rays exhibit strong Magnetic Circular Dichroism (MCD), i.e., the intensities of the individual multiplet lines depend on the relative orientation of sample magnetization and photon spin. On the example of the well- resolved Tb 4 f PE multiplet, it is shown that in relevant cases 4 f PE lines are esse ntially only observed for one magnetization direction, either parallel or antiparallel to the photon spin. These large MCD effects in 4 f PE open new perspectives in the analysis of surface and thin-film magnetism and provide a sensor for the degree of circular polarization of soft X-rays over a wide photon-energy range. To demonstrate the potential of MCD in 4 f PE as a magnetometer, we studied Gd(0001) and Tb(0001), where the magnetization of the topmost atomic (0001) layer can be easily separated from the bulk magnetization via the surface core-level shift. In multicomponent magnetic thin films containing different rare-earth elements, 4 f PE allows to monitor magnetization in an element-specific way, e.g., in case of the hetero-magnetic interface 1ML Eu/Gd(0001).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050088
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  • 9
    Electronic Resource
    Electronic Resource
    Structure formation in UV-laser-ablated polyimide foils (1992)
    Springer
    Applied physics 55 (1992), S. 119-120 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 61.40 ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The formation of nap-type and wall-type structures on laser-irradiated polyimide (PI) films is reported for the first time. These investigations demonstrate that such structures can develop on non-melting polymer surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324612
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  • 10
    Electronic Resource
    Electronic Resource
    Circular dichroism in 4f photoemission from magnetically ordered rare-earth materials (1995)
    Springer
    Applied physics 60 (1995), S. 179-189 
    Details
    ISSN: 1432-0630
    Keywords: 75.50.Cc ; 78.20.Ls ; 79.60.Cn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 4f Photoemission (PE) spectra from magnetically ordered rare-earth materials using circularly polarized X-rays exhibit strong Magnetic Circular Dichroism (MCD), i.e., the intensities of the individual multiplet lines depend on the relative orientation of sample magnetization and photon spin. On the example of the wellresolved Tb 4f PE multiplet, it is shown that in relevant cases 4f PE lines are essentially only observed for one magnetization direction, either parallel or antiparallel to the photon spin. These large MCD effects in 4f PE open new perspectives in the analysis of surface and thin-film magnetism and provide a sensor for the degree of circular polarization of soft X-rays over a wide photon-energy range. To demonstrate the potential of MCD in 4f PE as a magnetometer, we studied Gd(0001) and Tb(0001), where the magnetization of the topmost atomic (0001) layer can be easily separated from the bulk magnetization via the surface core-level shift. In multicomponent magnetic thin films containing different rare-earth elements 4f PE allows to monitor magnetization in an element-specilic way, e.g., in case of the hetero-magnetic interface 1 ML En/Gd(0001).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538244
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