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  • 1
    Electronic Resource
    Electronic Resource
    Behavior of density and refractive index in mixtures of 2,6-lutidine and water (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 604-609 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Density, refractive index, and their temperature derivatives are measured over a wide range of concentration, temperature, and wavelength in the partially miscible binary liquid 2,6-lutidine-water. The expected anomalies at the critical concentration are within the relative precision of the measurements (a few 10−6). The Lorentz–Lorenz formula is compared with the data in the whole concentration range. It remains valid within the regular correction factors. We present fitting functions in temperature, concentration, and wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466921
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  • 2
    Electronic Resource
    Electronic Resource
    Light intensity measurements from dark noise analysis of video images (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3659-3661 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: It is possible to determine the absolute intensity of a light signal recorded by a video camera with automatic gain by analyzing the background part of the recorded images. The method is based on the determination of the histogram of the gray levels of the dark pixels whose inverse variance appears to be proportional to the camera gain in a large domain of light intensity. An example is given by images recorded by a charge coupled device camera in a space experiment where the light transmittivity is used as a local probe for temperature measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143593
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  • 3
    Electronic Resource
    Electronic Resource
    Universal amplitude combinations in critical mixtures of triethylamine and water from refractive index, density, turbidity, and specific heat experiments (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6747-6754 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report new data on refractive index (n), density (ρ), and turbidity (τ) in a mixture of triethylamine and water at critical concentration. These data have been obtained simultaneously for the same sample in order to make the comparison of amplitudes the most reliable. The high sensitivity (a few ppm) of the refractive index and density measurements enables the leading critical amplitude to be obtained accurately in both cases. The ratio of these amplitudes is in good agreement with the ratio (dn/dρ) far from Tc or that deduced from a suitably corrected Lorentz–Lorenz formula. This justifies the use of refractive index measurements to determine thermodynamic divergences. From the turbidity measurements, values for the correlation length and osmotic compressibility amplitudes can be obtained, allowing the universal amplitude combinations R+ξ =0.29±0.02 and R+c =0.056±0.01 to be determined. Both values are in agreement with the 2-scale factor universality based theories. Negative corrections to scaling are found for the susceptibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458259
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  • 4
    Electronic Resource
    Electronic Resource
    The Lorentz–Lorenz relationship in the phase diagram of triethylamine and water. Application to the coexistence curve (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3432-3436 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The refractive index (n) of the partially miscible mixture of triethylamine and water has been measured at various temperatures (T) and concentrations. The data have been fitted to an analytic function. By using existing density data, the validity of the Lorentz–Lorenz formula has been tested. The same discrepancies that are usually observed in liquids have been found (−0.4% on n, and −13% on dn/dT). No supplementary deviation has been detected in the vicinity of the critical point. These data have been used to obtain a precise determination of the coexistence curve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458824
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: Thickness of fluid interfaces near the critical point from optical reflectivity measurements [J. Chem. Phys. 87, 3056 (1987)] (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6911-6911 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458926
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  • 6
    Electronic Resource
    Electronic Resource
    Simultaneous measurements of refractive index and density in a microemulsion near a critical end point (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 9026-9030 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The behavior of the density and the refractive index of a microemulsion of sodium dodecyl sulfate, water, n-pentanol, and n-dodecane is investigated near its critical end point. Measurements are made simultaneously and both are to an accuracy of a few ppm. In contrast to the density data which can be fitted to a regular, linear behavior in the whole temperature range (28.3–30.5 °C), the refractive index exhibits a pronounced anomaly near the critical point. The temperature dependence of such an anomaly cannot be described by a power law behavior. However, it can be understood as a chemical change connected to morphological modifications in the dispersed phase, a phenomenon connected to the close vicinity of sponge-like phases. This approach accounts well for the data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459242
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  • 7
    Electronic Resource
    Electronic Resource
    Coexistence curve of a three-component microemulsion by a gradient method (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 8194-8198 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We describe a new gradient technique to determine the coexistence curve of partially miscible liquid mixtures. The method allows this determination to be done using a single sample and gives the proper slice (temperature-order parameter) of the coexistence surface, in contrast to the conventional methods. We employed this technique to determine the coexistence curve of a ternary microemulsion, consisting of water, benzene, and benzyldimethyl-n-hexadecyl ammonium chloride (BHDC), in a narrow temperature range close to the critical point. The value of the exponent β describing the coexistence curve was found to be 0.34±0.08.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464524
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Apparatus for simultaneous light scattering and microscopic video observation: Application to the growth of a droplet pattern (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 183-184 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple apparatus is described which allows the simultaneous microscopic observation of a pattern and the analysis of the light scattered by it at low angles using a single video image. Applications are found any time a spatial Fourier analysis is needed in addition to a simple visualization. As an example, we report a preliminary study of the growth of "breath figures''—a pattern formed by the condensation of vapor blown onto a cold surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139303
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  • 9
    Electronic Resource
    Electronic Resource
    Thickness of fluid interfaces near the critical point from optical reflectivity measurements (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 3056-3061 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical reflectivity of fluid interfaces near the critical point is analyzed in the light of recently improved estimates of the surface tension and measurements of the bulk correlation length. In contrast to earlier analyses, it becomes possible to discriminate between the two leading phenomenological theories of fluid interfaces, the intrinsic structure theory originated by Maxwell and van der Waals and the capillary wave theory as developed by Buff, Lovett, and Stillinger. For one of the two systems studied, cyclohexane–methanol, capillary wave theory is found to fit the reflectivity data well, while intrinsic structure theory is in strong disagreement with the reflectivity data. A simple combination of the two theories does not significantly improve the performance of capillary wave theory. For the second system studied, sulfur hexafluoride, neither capillary wave theory nor intrinsic structure theory fits the reflectivity data well, while their combination gives partial agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453042
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  • 10
    Electronic Resource
    Electronic Resource
    Anomalies of heat transport in near critical fluids under weightlessness
    Amsterdam : Elsevier
    Advances in Space Research 11 (1991), S. 269-276 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(91)90295-U
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