Abstract are undertaken in an attempt to understand how such compounds function as catalysts, in particular as isomerization catalyst following the Fischer‐Tropsch process.

Tungsten Oxide

10.1002/chin.198826025

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Citations (0)

A gas-gun facility for material impact studies using low-velocity, low-mass projectiles

Journal of Physics E Scientific Instruments (1989)

James R. Brown P. J. C. Chappell G. T. Egglestone E.P. Gellert

A laboratory scale gas gun and associated instrumentation have been designed and constructed as a tool for transverse impact experiments on composite materials at velocities in the range 200-750 m s-1, using projectiles of 5.59 and 7.62 mm diameter (0.22 and 0.30 calibre respectively) which simulate fragments of larger munitions. Good agreement is obtained between the measured projectile velocities and those calculated from an approximate theoretical dynamic gas model.

Light-gas gun

10.1088/0022-3735/22/9/016

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Citations (17)

Determination of poly(p-phenylene terephthalamide) fiber surface cleanliness by inverse gas chromatography

Journal of Colloid and Interface Science (1989)

P. J. C. Chappell Daryl R. Williams

Inverse gas chromatography

Alkane

Poly(N-isopropylacrylamide)

Dilution

10.1016/0021-9797(89)90360-3

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Citations (42)

Surface thermodynamic analysis of finishes on Kevlar 29* fabrics by inverse gas chromatography

Journal of Adhesion Science and Technology (1990)

P. J. C. Chappell Daryl R. Williams

The surface thermodynamic properties of fibers from a variety of Kevlar 29 fabrics have been measured using inverse gas chromatography (IGC). The enthalpy (ΔH° A), entropy (ΔS° A), and free energy (ΔG° A) of adsorption, and the dispersive component of the surface free energy (γd s) have been calculated from alkane retention volumes on fibers with various surface finishes, in addition to commercially scoured and laboratory cleaned samples. All of the samples, with the exception of the laboratory cleaned sample, have low surface energies consistent with the presence of surface finishes or, in the case of the scoured samples, significant surface contamination. A majority of these samples also exhibit anomalous alkane retention volumes around room temperature. This phenomenon, absent in the laboratory cleaned sample, is consistent with a glass transition in the surface film. Infrared analysis of material extracted from these samples supports this conclusion. The detection of glass transitions in surface films on scoured samples highlights the sensitivity of IGC to the thermodynamic properties of fiber surfaces.

Inverse gas chromatography

Alkane

Kevlar

10.1163/156856190x00027

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Citations (6)

XPS analysis of model p-aramid compounds and poly (p-phenylene terephthalamide) fibers

Journal of Colloid and Interface Science (1990)

P. J. C. Chappell Daryl R. Williams Graeme A. George

Aramid

Poly(N-isopropylacrylamide)

10.1016/0021-9797(90)90148-h

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Citations (16)