M. E. Abu-Zeid

Photoacoustic study of silica—silane coupling reagent interactions

Abstract Photoacoustic spectroscopy is an effective technique for studying filler—coupling reagent interactions. The use of coupling agents with inorganic fillers necessitates a thorough understanding of the binding activity that takes place. The binding of vinyltriethoxysilane to the hydroxyl groups on a silica surface was identified. Whereas the visible part of the photoacoustic spectra revealed that strong binding took place, the near IR characterized the surface binding groups.

Measurement of fluorescence decay of crude oil: A potential technique to identify oil slicks

The single photon counting technique has been used to measure the decay time for several Kuwaiti crude and refined oils. Fluorescent characteristics of two different bunker oils from widely separate geographic areas have been studied. Laser induced fluorescent data for the crude oil samples are compared with the decay time results to evaluate the potential of these techniques for the identification of oil sticks in the marine environment. Response of the oil film thickness to various excitation wavelengths from a CW Ar ion laser and a pulsed xenon lamp has been investigated.

Study of natural weathering of polyurethane rigid foam by photoacoustic spectroscopy

Abstract Photoacoustic spectroscopy was used to obtain the spectra of polyurethane rigid foam samples in powder and solid forms. This technique appears to be extremely efficient for studying optically opaque samples and can offer useful applications in such practical problems as the degradation of naturally weathered polyurethane.