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  • 1
    Electronic Resource
    Electronic Resource
    Aerosol reactor design: effect of reactor type and process parameters on product aerosol characteristics (1986)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 25 (1986), S. 634-642 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i200034a007
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A diffusive transport relaxation technique for studying laser-induced chemical vapor deposition reactions at high pressures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2513-2522 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A diffusive transport relaxation technique has been developed to study the chemical processes occurring during laser-induced chemical vapor deposition. The technique is based on modulation of the laser light intensity which results in a modulation of the surface reaction rate. This perturbation of the reaction rate produces transients in the gas-phase reactant and product concentrations for the case of gas-phase transport-limited deposition. Product species can be differentiated from species formed from the reactant during ionization and fragmentation due to the phase-sensitive nature of the detection scheme. The system response is examined theoretically by describing the response of the surface reaction rate to the modulated laser light and then examining the response of the gas-phase reactant and product concentrations to the modulated surface reaction. The technique was used to identify the gaseous products formed during laser-induced deposition of gold using dimethyl gold hexafluoroacetylacetonate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342798
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Single-crystal YBa2Cu3O7 particle formation by aerosol decomposition (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2149-2151 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystal YBa2Cu3O7 particles have been formed in a carbon-free gaseous flow system by thermally decomposing droplets containing the nitrate salts of Y, Ba, and Cu in water followed by calcining and annealing in the gas phase. The electron diffraction pattern for particles ranging in size from 0.1 to 1.5 μm corresponded to single crystals of orthorhombic YBa2Cu3O7 while the powder x-ray diffraction pattern confirmed the presence of single-phase material. Energy dispersive spectroscopy showed a similar composition for all particles examined. Iodometric titration showed that the particles were fully oxygenated. Two types of single-crystal particles were observed, equiaxed and elongated. Formation of solid single-crystal particles is favored by operation near the melting point of the material and by long reactor-residence times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342868
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Surface temperature rise in multilayer solids induced by a focused laser beam (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2749-2753 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Surface temperatures of a laser-heated structure consisting of intersecting gold and nickel lines on a Si substrate with a SiO2 surface layer were determined experimentally and theoretically. Temperatures were measured with micron-sized thin-film thermocouples formed from intersecting gold and nickel lines. Temperature profiles were calculated using a finite difference method which took into account the optical and physical properties of the thermocouple metal lines, the silicon dioxide layer, and the silicon substrate. For a 0.2-μm SiO2 layer, maximum surface temperatures were much higher with the metal lines than without because of the lower reflectivity of the gold relative to the silicon and the limited ability of the thin metal lines to conduct heat away from the irradiated region. Calculated maximum temperatures on the metal lines depended strongly on the thicknesses of the insulating SiO2 layer and the metal lines. Application of these results to the dynamics of laser-induced chemical vapor deposition is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337863
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Time-resolved reflectance studies of surface melting during laser-assisted deposition with a modulated laser source (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 221-226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved reflectance measurements have been used to study the time evolution of the surface reflectance during deposition of gold from dimethylgold hexafluoroacetylacetonate with both modulated and unmodulated laser light. The observed change in reflectivity found during deposition with a modulated laser source is due to surface melting or sintering of the gold deposit. The change in reflectance observed upon undergoing a transition from a rough to a smooth surface is theoretically calculated for a surface with a random distribution of facet shapes and sizes. The observed changes in reflectance are consistent with the rough polycrystalline surface layer becoming smooth in a transient molten state. An impulsive temperature rise due to a rapid exothermic reaction taking place at the leading edge of the laser pulse has been estimated theoretically and is consistent with the observed time-dependent data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350746
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Kinetics of laser-photochemical deposition by gas-phase dissociation (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1000-1007 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of reaction and transport kinetics on deposition resulting from laser-induced gas-phase photodissociation were investigated using numerical and analytical models. Deposition rates and deposit profiles for a laser beam focused onto a substrate in a chamber were determined assuming production of metal atoms in the gas phase by a single-photon dissociation mechanism and free-molecular and diffusive transport to chamber surfaces. The predictions of the model computations were compared to experimental and theoretical results from the literature. The effect of total pressure on deposition rates and profiles depends strongly on the sticking coefficient. With a sticking coefficient of unity, deposition rates and profiles do not depend strongly on the total pressure or transport regime. However, when the sticking coefficient is 0.01, the deposit profile flattens dramatically at pressures below about 1 atm. The conditions and consequences of gas-phase reactant depletion due to diffusional limitations were also demonstrated. The extent of gas-phase reactant depletion can be predicted by a single dimensionless group; however, transport of the reaction product must also be considered to predict deposition rates. At high laser power or total pressure, reactant depletion leads to reduced deposition rates and flatter deposit profiles, and severe depletion can produce volcano-shaped deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347414
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The role of mass transport in laser-induced chemistry (1990)
    s.l. : American Chemical Society
    Accounts of chemical research 23 (1990), S. 188-194 
    Details
    ISSN: 1520-4898
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ar00174a004
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Formation of dense barium calcium titanate (Ba0.86Ca0.14TiO3) particles by aerosol decomposition (1991)
    s.l. : American Chemical Society
    Chemistry of materials 3 (1991), S. 746-751 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00016a033
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Aerosol-Assisted Chemical Vapor Deposition (AACVD) of Binary Alloy (AgxPd1-x, CuxPd1-x, AgxCu1-x) Films and Studies of Their Compositional Variation (1995)
    s.l. : American Chemical Society
    Chemistry of materials 7 (1995), S. 1539-1546 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00056a021
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  • 10
    Electronic Resource
    Electronic Resource
    Monodisperse particle production by vapor condensation in nozzles (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 457-465 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: When a gas containing a condensable vapor expands from a reservoir through a subsonic or supersonic nozzle, the gas is cooled and the vapor can condense to form particles. A theoretical framework to describe such systems is given. Calculations based on the theory show that approximately uniform submicrometer particles can be produced at high mass rates by subsonic nozzle expansion. Four operating conditions (exit Mach number and the reservoir temperature, pressure, and saturation ratio) and the nozzle shape (area distribution and length) control the spread of the particle size distribution. Two modes of nozzle operation are predicted. In one case nucleation is confined to the nozzle while in the other case nucleation occurs both in the nozzle contraction and in a straight section following the nozzle. Nearly monodisperse particles can be produced for a wide range of operating conditions for both types of nozzle operation. Particle properties are less sensitive to operating conditions, however, when the conditions are chosen so that nucleation is confined to the nozzle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454624
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    Paper (German National Licenses)
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