Molarity concentrations overview

In one series of measurements, the crosslinker concentration was varied in gels based on 15 % acrylic acid. The pH in these systems is around 2.3, hence they are essentially nonionic with only around 0.25 % of the carboxylic acid groups being dissociated. Figure 1 gives an overview on the macroscopic properties of the gels. The shear modulus, G, measured by small uniaxial compression of the gel cylinders as reported elsewhere (7) is plotted versus the theoretical network density, Vth. Vth is twice as large as the molar concentration of... 

So a broad overview of ink technology shows how the intensity of colour (its absorbance) is a function of three variables molar absorption coefficient s, path length l and chromophone concentration c. We have already met Beer s and Lambert s laws. We now combine the two to yield the Beer-Lambert Law ... 

Experimental methods for the determination of the transport coefficients of low-molar-mass substances in polymers have been well established for a long time (for an overview see Ref. 29). Complications arise due to the often observed dependence of solubility and diffiisivity on solute concentration in the polymer [8, 29, 30] however, for the lightest gases the diffudvity is often indej ident of concentration in the pressure range of exf rimental interest, and for the purpose of determination of the fundamental mechanisms of solubility and diffiisivity pursued here, and for comparison with computer simulations, the limit of low concentration is sufficient. There, the transport coefficients are independent of penetrant concentration. The solubility is given by... 

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