way to achieve this is to utilize small "crystallites" of smectite clays rather than extended, ordered arrays. Decreasing the size of the crystallite will also influence the relative efficiency of twoversus three-dimensional (stochastic) flows of the diffusing coreactant to the target molecule. This effect, first formalized by Adam and Delbriick11 1and referred to as "reduction of dimensionality", has been documented for reaction-diffusion process taking place within symmetrical and asymmetrical lattice geometries in previous work (see especially Fig. 7 in ref 12).While the insights drawn from Figures 1-5 are of interest, it is clear that a number of further factors need to be taken into account before contact can be made with, for example, the experimental studies of photochemical water cleavage in clays.13"15
A comparison of near-infrared (NIR) and mid-infrared (mid-IR) techniques for the determination of hydroxyl number in polyesters was made. Both of these analyses are faster and involve less exposure to irritating, highly toxic, and corrosive chemicals than the chemical analysis, although both techniques rely on developing calibration files. The mid-IR procedure consisted of making thin films of polymer on IR crystals by spin coating and taking transmission spectra. The program used for the analysis, Nicolet PLS Quant, compensated for the resulting indeterminate pathlength. The NIR procedure consisted of taking transmission spectra of the clear, viscous polymers in 4-mm cuvettes and using standard regression analysis of the spectra.
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