U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Michael R Moldover (Assoc)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 126 - 150 of 161

Critical exponent for viscosity

December 15, 1990
Author(s)
Robert F. Berg, Michael R. Moldover
We have measured the critical exponent y characterizing the divergence of the viscosity eta  |T – Tc|^-y for carbon dioxide and xenon. The values of y for both fluids fall within the range y = 0.041 ± 0.001 and are consistent with the range y = 0.042 ± 0

Critical exponent for the viscosity of carbon dioxide and xenon

August 1, 1990
Author(s)
Robert F. Berg, Michael R. Moldover
The viscosities eta of carbon dioxide and xenon have been measured near their critical points and the critical exponent y characterizing the asymptotic divergence, eta ~ |T- Tc|^-y, has been determined. Both fluids yielded exponents in the rangey = 0.041 ±

Critical exponent for the viscosity of four binary liquids

September 15, 1988
Author(s)
Robert F. Berg, Michael R. Moldover
We have measured the viscosity of four binary mixtures near their consolute points: (1) methanol + cyclohexane, (2) isobutyric acid + water, (3) nitroethane + 3-methylpentane, and (4) 2-butoxyethanol + water. The viscosity data are consistent with the

Quantitative characterization of the viscosity of a microemulsion

September 15, 1987
Author(s)
Robert F. Berg, Michael R. Moldover, John S. Huang
We have measured the viscosity of the three-component microemulsion water/decane/ AOT as a function of temperature and droplet volume fraction. At temperatures well below the phaseseparation temperature the viscosity is described by treating the droplets

Viscosity and density of two alkali metal mixtures

September 1, 1987
Author(s)
Robert F. Berg, Michael R. Moldover, Savely Rabinovich, Alexander Voronel
We have measured the density and viscosity of a K-Cs binary mixture and a Na-K-Cs ternary mixture from their crystallisation points (234 K and 199 K respectively) to 300 K. Extrapolations of the fluidity data indicate that the effective glass temperatures

Measurement of the ratio of the speed of sound to the speed of light

October 1, 1986
Author(s)
James B. Mehl, Michael R. Moldover
Measurements of the resonance frequencies of the acoustic modes and of the microwave modes of a single cavity can determine u/c, the ratio of the speed of sound of a gas to the speed of light. Such measurements with a monatomic gas would determine the

Viscometer for low frequency, low shear rate measurements

August 1, 1986
Author(s)
Robert F. Berg, Michael R. Moldover
We describe a torsion-oscillator viscometer whose low frequency ( 0.5 Hz) and very low shear rate (0.05 s-1) are required for measurements of shear sensitive fluids such as microemulsions, polymer melts and solutions gels, and liquid mixtures near critical

What controls the thicknesses of wetting layers?

July 1, 1986
Author(s)
Richard F. Kayser, Michael R. Moldover, James W. Schmidt
Wetting layers can form on solid and fluid substrates when the long-ranged part of the effective intermolecular potential (which tends to thicken the layers) competes with gravity (which tends to thin the layers). Authors have reported layers whose

Viscosity measurements near a critical point using a novel torsion oscillator

May 1, 1986
Author(s)
Robert F. Berg, Michael R. Moldover
A torsion-oscillator viscometer has been constructed for the measurement of the viscosity of fluids near both liquid-vapor and liquid-liquid critical points. This viscometer has a resolution of ±0.2% and operates at a low frequency (0.6 Hz) and a very low

Wetting Layers and Dispersion Forces for a Fluid in Contact with a Vertical Wall

February 18, 1985
Author(s)
Richard F. Kayser, James W. Schmidt, Michael R. Moldover
When a liquid wets a vertical wall, wetting layers form on the wall high above the liquid-vapor meniscus. These layers are stabilized against gravity by dispersion forces. For SF_6 in contact with fused silica, we find layers between 20 and 40 nm thick in