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  • 1
    Electronic Resource
    Electronic Resource
    Sol-Gel Processing of Zirconia Coating for HR Mirrors with High Laser Damage Threshold (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 271-274 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel processing ; HR coatings ; ZrO2 ; hydrothermal synthesis ; laser damage threshold
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract High laser-damage resistant coatings are very important in high power laser systems. In this study ZrO2 thin films are prepared by sol-gel spin-coating technology from suitable zirconia aqueous colloidal suspensions containing nano-crystalline ZrO2 at room temperature synthesized by a hydrothermal process from an inorganic precursor (ZrOCl2·8H2O). By adding a soluble organic binder PVP to the suspension prior to application, it is possible to substantially increase the coating refractive index and the abrasion-resistance as well as the laser damage threshold. The features of the coatings and the colloidal suspensions are investigated. Multilayer highly reflective dielectric coatings are also elaborated by applying quarterwave-thick alternating coatings of the binder-aided zirconia and silica, which is prepared with the sol-gel process from TEOS. To achieve 99% reflectivity, 19–21 layers are required. Single shot laser damage tests are carried out using a high power laser at 1064 nm wavelength with a pulse duration of 2.5 ns. The laser damage thresholds of 18 and 15 J/cm2 are achieved for single ZrO2-PVP coating and ZrO2-PVP/SiO2 multilayers respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008761010781
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  • 2
    Electronic Resource
    Electronic Resource
    Behaviour of ring-shaped polymers in dilute solution. Quantitative calculation and experimental verification for molecular dimensions and second virial coefficient (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1237-1248 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Relationships between the ratios of the mean-square radii of gyration gs and the second virial coefficients gA2 of ring-shaped and linear polymers with the degree of polymerization P of the polymer and its Peterlin exponent ε in dilute solution were derived theoretically and numerical values calculated. The second virial coefficients of ring-shaped and of linear polystyrene at 25°C in toluene were determined using light scattering. By verifying the theoretical calculation based on the experimental determination of this polymer-solvent system with light scattering and other methods reported in the literature, the agreement between theoretical calculation and experimental results is shown. The correlation equations for linear (l) and ring-shaped (r) polystyrene in toluene at 25°C A2, 1 = 8,06 · 10-3 · M0,224 and A2,r = 6,68 · 10-3 · M0,218 were obtained using light scattering.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920601
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  • 3
    Electronic Resource
    Electronic Resource
    A new theoretical approach to problems of the solution behaviour of ring-shaped polymersDedicated to Prof. Dr. B. Vollmert with best wishes on the occasion of his 70th birthday (1991)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 192 (1991), S. 1249-1254 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In order to explain the difference in theta temperatures between ring-shaped polymers and their corresponding linear polymers, the Huggins parameters χ of ring-shaped polymers is assumed to obey the dependence χ = χ1 (1 + σ φ2) on local segment concentration as expressed by the volume fraction of the polymer φ2, and σ being a constant. A comparison between theoretical results and light scattering measurements of Roovers and ourselves is satisfactory.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1991.021920602
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