Diffuse transmittance spectroscopy of diatomic Ag nuclei on AgBr microcrystals

Article Abstract:

The absorption of light by diatomic Ag nuclei on AgBr microcrystals has been studied with a diffuse transmittance spectroscopy method which uses a large-area photodetector. The method utilized is better than diffuse reflectance spectroscopy because it does not require the Kubelka-Munk equation. Results show that a well-defined absorption band for reduction-sensitized octahedral AgBr emulsions centered at 455 nm exists at room temperature. This finding may be due to the high density of diatomic Ag nuclei which form on the AgBr grain surface.

Analysis, Crystals, Spectra, Silver, Absorption of light, Light absorption

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A model for thermosetting polymerization

Article Abstract:

A study on equilibrium polymerization was conducted to investigate the problem of chain polymerization in increasingly viscous environments to more readily understand thermosetting processes where multiple branching results in a highly crosslinked gel. The experiment successfully demonstrates the use of a novel approach for probing polymer reaction dynamics especially those of thermoset polymers. Experimental methodology and findings are presented.

Research, Polymers, Polymerization, Chemical reactions, Stochastic processes, Thermosetting composites

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