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SA Ali

Publications and source records attributed to SA Ali.

2 recordsLinked to original sources
PubMed1999

Correction to Microscopically Determined Particle Size According to Diffraction Correction Theory.

The theory of diffraction correction for transparent (phase) spherical particles under partially coherent illumination has been applied to the optical photomicrographic determination of particle size distribution for four different nearly monodisperse polystyrene latex samples. The thus corrected particle size distribution for each sample has been compared with the corresponding electron microscopic determination. Copyright 1999 Academic Press.

Journal Article↗
PubMed1998

The Primary Electroviscous Effect in Polystyrene Latices of Small Particle Size Range Prepared with the Addition of Anionic Surfactant as Emulsifier. Effect of Increasing Concentrations of Quaternary Ammonium Counterions of Different Ionic Sizes and Stability Characteristic of the Latices and the Latex-Electrolyte Mixtures.

Polystyrene latices were prepared by the emulsion polymerization method using hydrogen peroxide as an initiator and sodium dodecyl sulfate as the emulsifying agent. Latices of different particle sizes were prepared by the seeded growth technique. The particle size and its frequency distribution were determined by electron microscope. The viscosities and electrophoretic mobilities of the latex and latex:added electrolyte mixtures were measured in the presence of gradually increasing concentrations of quaternary ammonium counterions of different ionic sizes. The zeta-potentials were calculated by the computational method of Wiersema-Loeb- Overbeek (WLO); the surface charge densities sigma were calculated by the method of Loeb-Wiersema-Overbeek (LWO). The primary electroviscous effects were calculated by using the Booth equation. The free energies of adsorption Delta&Gmacr;ads of the counterions on the particle surface were calculated. The stability characteristic of the latices and latex-added electrolyte mixtures has been studied on the basis of the DLVO theory. Copyright 1998 Academic Press.

Journal Article↗