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  • Articles  (58)
  • 1995-1999  (58)
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  • Articles  (58)
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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of Diffusion Processes in HEMA-DEGMA Hydrogels by ESR Imaging (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 5780-5788 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00121a013
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  • 2
    Electronic Resource
    Electronic Resource
    Tomographic study of the three-dimensional distribution of a high-fluence implant in a polymer (1999)
    Springer
    Applied physics 68 (1999), S. 429-434 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.72.Hh; 61.72.Ww; 61.80.Jh; 66.30.Jt; 79.20.Wc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 6 Li+ ions were implanted into PMMA at high flux up to fluences of 1×1015 cm-2 under angles of 0° to 70° towards the surface normal. The Li depth distributions were determined by means of neutron depth profiling, and compared with theoretical simulations. The three-dimensional Li distribution was reconstructed from the one-dimensional depth profiles by means of a tomographic technique. It turned out that the measured Li depth distributions can be described by a superposition of Gaussian and exponential functions. This points at considerable Li mobility during or after the ion implantation, with trapping in unsaturable traps in the ion-irradiated region which roughly follow the electronic energy transfer distribution. The Li redistribution is more pronounced along the track direction than transversely to it. The normalized Li distributions in various implantation directions were fed into our tomographic program to reconstruct the three-dimensional distribution of the deposited lithium. As expected, the lithium preferentially distributes along the ion tracks. This work is another hint that mobility of implanted ions in solids does not proceed isotropically, but is strongly influenced by the radiation-damage distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050918
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  • 3
    Electronic Resource
    Electronic Resource
    Nanotomographic examinations of ion tracks in cellulose nitrate by ion energy loss spectrometry (1999)
    Springer
    Applied physics 68 (1999), S. 87-91 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 02.90.+p; 61.41.+e; 61.80.Jh; 82.30.Lp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050858
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  • 4
    Electronic Resource
    Electronic Resource
    Precipitation of dissolved alkali salts and fullerenes on surfaces of doped porous matter (1996)
    Springer
    Applied physics 62 (1996), S. 191-195 
    Details
    ISSN: 1432-0630
    Keywords: 81.35 ; 66.30 ; 81.30 ; 61.46
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Standard porcelain samples burnt at different temperatures were doped with LiCl, organo-Li solutions, or with fullerene solution and then dried. The depth profiles of both Li and fullerene were determined. The distributions of the incorporated dopants strongly depend on the samples' porosity. Additional ultrasonic treatment during the diffusion process has a fatal influence on the porcelain structure, resulting in enhanced dopant uptake of the remaining sample. The surface-near shape of the depth profiles is interpreted by solvation, i.e., by precipitation of the dissolved salts or fullerenes in the surface-near zone during the drying process. It is shown that the solvation effect is important only in the case of media with high porosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575080
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  • 5
    Electronic Resource
    Electronic Resource
    On the redistribution of 6Li+ ions implanted into polypropylene foils (1996)
    Springer
    Applied physics 62 (1996), S. 359-367 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.80.Th; 61.40.Km
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  6Li+ (150 keV) was implanted into thin polypropylene foils at fluences of 1×1013 to 1×1014 cm-2. Subsequent neutron depth profiling measurements of the Li distributions revealed considerable deviations from the expected ballistic range profiles. This Li redistribution was simulated by a numerical computer calculation. The best fit between measurements and simulations was obtained by assuming that (i) Li redistributes immediately after its ballistic slowing-down, (ii) the Li mobility is enhanced in the radiation-damaged polymer region, the local diffusion enhancement being controlled by the target’s electronic damage, (iii) mobile Li is readily trapped at radiation-induced defects, their density being proportional to the target’s electronic damage, (iv) these traps are saturable ones, and (v) Li migration is not restricted to the ion track region, but proceeds also through the neighboring unirradiated bulk, though with slower speed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594234
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  • 6
    Electronic Resource
    Electronic Resource
    On the redistribution of6Li + ions implanted into polypropylene foils (1996)
    Springer
    Applied physics 62 (1996), S. 359-367 
    Details
    ISSN: 1432-0630
    Keywords: 61.80.Th ; 61.40.Km
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract 6Li+ (150 keV) was implanted into thin polypropylene foils at fluences of 1 x 1013 to 1 x 1014 cm−2. Subsequent neutron depth profiling measurements of the Li distributions revealed considerable deviations from the expected ballistic range profiles. This Li redistribution was simulated by a numerical computer calculation. The best fit between measurements and simulations was obtained by assuming that (i) Li redistributes immediately after its ballistic slowing-down, (ii) the Li mobility is enhanced in the radiation-damaged polymer region, the local diffusion enhancement being controlled by the target's electronic damage, (iii) mobile Li is readily trapped at radiation-induced defects, their density being proportional to the target's electronic damage, (iv) these traps are saturable ones, and (v) Li migration is not restricted to the ion track region, but proceeds also through the neighboring unirradiated bulk, though with slower speed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01594234
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of energetic ions on grafting to polyethylene (1996)
    Springer
    Applied physics 63 (1996), S. 441-446 
    Details
    ISSN: 1432-0630
    Keywords: 61.40 ; 61.80 ; 66.30 ; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Li salts of acrylic acid were grafted to polyethylene, PE. It is known that li is mobile in this material at room temperature, and hence can act as a probe for newly introduced defects. After irradiation of PE(Li) with 100 keV He+ ions at different fluences the Li depth distributions were measured by NDP. Changes in the Li distributions are observed which are ascribed to bonding at oxygen, the latter one preferentially penetrating into the PE via the irradiation-damaged sample surface. With increasing sample age, i.e. after exposure to ambient atmosphere for more than half a year, Li appears to lose its original mobility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571671
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  • 8
    Electronic Resource
    Electronic Resource
    Precipitation of dissolved alkali salts and fullerenes on surfaces of doped porous matter (1996)
    Springer
    Applied physics 62 (1996), S. 191-195 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.35; 66.30; 81.30; 61.46
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Standard porcelain samples burnt at different temperatures were doped with LiCl, organo-Li solutions, or with fullerene solution and then dried. The depth profiles of both Li and fullerene were determined. The distributions of the incorporated dopants strongly depend on the samples’ porosity. Additional ultrasonic treatment during the diffusion process has a fatal influence on the porcelain structure, resulting in enhanced dopant uptake of the remaining sample. The surface-near shape of the depth profiles is interpreted by solvation, i.e., by precipitation of the dissolved salts or fullerenes in the surface-near zone during the drying process. It is shown that the solvation effect is important only in the case of media with high porosity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575080
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of energetic ions on grafting to polyethylene (1996)
    Springer
    Applied physics 63 (1996), S. 441-446 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 61.40; 61.80; 66.30; 81.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  Li salts of acrylic acid were grafted to poly- ethylene, PE. It is known that li is mobile in this material at room temperature, and hence can act as a probe for newly introduced defects. After irradiation of PE(Li) with 100 keV He+ ions at different fluences the Li depth distributions were measured by NDP. Changes in the Li distributions are observed which are ascribed to bonding at oxygen, the latter one preferentially penetrating into the PE via the irradiation-damaged sample surface. With increasing sample age, i.e. after exposure to ambient atmosphere for more than half a year, Li appears to lose its original mobility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571671
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  • 10
    Electronic Resource
    Electronic Resource
    Comparative study of human monocyte and platelet adhesion to hydrogels in vitro – effect of polymer structure (1997)
    Springer
    Journal of materials science 8 (1997), S. 19-23 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Blood platelet and monocyte adhesion was studied in vitro with respect to the influence of hydrophilic polymer chemical functional groups and their charge. The results showed that the strongest adhesion of human monocytes was to coverslips covered with cationic polymer. Platelet adhesion to all tested polymers proved to be negligible; no differences related to the charge of the polymers used were observed. These results show the obvious difference between the biocompatibility and haemocompatibility in vitro which must be taken into consideration during polymer biological properties testing before clinical trials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018534111419
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