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.

S A ALI

M SENGUPTA

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Journal of Colloid and Interface Science

The primary electroviscous effect and ζ potentials in two different series of polystyrene lattices of increasing particle size, prepared without addition of surfactants, have been measured, in the presence of increasing concentrations of quaternary ammonium counterions of different ionic sizes. It has been found that whereas for the larger particle size lattices the measured electrical contribution to the primary electroviscous effect (ηel/η0φ) = (η - η0)/η0φ - 2.5) decreases with increasing counterion concentration, as required by the theory, it either remains more or less constant or increases slowly in the case of smaller particle size lattices due possibly to the simultaneous occurrence of a slow feeble agglomeration of the latex particles in the presence of increasing counterion concentrations. Stability calculations according to the DLVO theory tend to support this conjecture. The electrophoretically measured ζ potentials show a steady decrease with increasing counterion concentration; a Langmuir-type isotherm relating the decrease of charge density in the Stem plane with the added counterion concentration has been found to be mostly able to account for the observed results. © 1986.

Journal of Colloid And Interface Science

The primary electroviscous effect in surfactant-free polystyrene lattices: The effect of increasing concentrations of quaternary ammonium counterions of different ionic sizes

The electroviscous effect in negatively charged AgI sol has been measured in presence of uni-, bi-, and trivalent cations at different concentrations, for a constant low volume fraction of the suspended solid particles. The I- ion activity of the sol (and also the particle size) gradually increased due to ageing effect during the entire course of study over a period of several months, but remained effectively constant during each course of study (over a few days) with any particular counterion. The potentials were simultaneously measured electrophoretically at identical electrolyte and I- ion concentrations. The electrical (double layer) contribution to the viscosity of the sol was calculated for various values of qo for each electrolyte. A close correspondence has been found in each case with the potential results. © 1982.

Journal of Electroanalytical Chemistry

The primary electroviscous effect in ageing AgI sols. Effect of increasing concentrations of counter ions of different valencies

Principles of Optics

FOUNDATIONS OF GEOMETRICAL OPTICS

Journal of the Optical Society of America

Diffraction Images of Annular and Disk-like Objects under Partially Coherent Illumination

Publications of the Research Institute for Mathematical Sciences

Table of Contents, Publ. Res. Inst. Math. Sci., Kyoto Univ., Ser. A , Volume 3 (1967/1968)

Correction to microscopically determined particle size according to diffraction correction theory. II. Application to aqueous polystyrene latex particles of varying size

Journal	Journal of Colloid and Interface Science
Publisher	Academic Press Inc.
ISSN	0021-9797