Neutral Organic Compounds Research Articles

The kinetics of adsorption of neutral organic compounds at a mercury electrode

Summary It is shown theoretically, and illustrated experimentally, that an entirely diffusion-controlled adsorption process leads to a frequency-dependence of an electrode impedance which is analogous to that produced by a dielectric relaxation process with a particular spread of relaxation times. The possibility of detecting a finite adsorption rate from impedance measurements is examined experimentally for the adsorption of n -butyric acid, and cyclohexanol on a mercury electrode, and it is concluded that the relaxation time of the adsorption step lies between 10 −6 and 10 −10 sec in these cases.

The kinetics of adsorption of neutral organic compounds at a mercury electrode

It is shown theoretically, and illustrated experimentally, that an entirely diffusion-controlled adsorption process leads to a frequency-dependence of an electrode impedance which is analogous to that produced by a dielectric relaxation process with a particular spread of relaxation times. The possibility of detecting a finite adsorption rate from impedance measurements is examined experimentally for the adsorption of n -butyric acid, and cyclohexanol on a mercury electrode, and it is concluded that the relaxation time of the adsorption step lies between 10 −6 and 10 −10 sec in these cases.

Interlamellar Reactions of Tetracalcium Aluminate Hydrates with Water and Organic Compounds

AbstractTetracalcium aluminate hydrates are the first example of layer-structured crystals containing neutral sheets, which are highly capable of interlamellar adsorption of water and neutral organic compounds. In this respect tetracalcium aluminate hydrates present new aspects of the phenomenon of swelling, and bring about the challenge of comparison with the frequently examined clay-organic compounds.This report is concerned with the probable monolayer structure of tetracalcium aluminate hydrate which forms five hydration stages. A summary concerning configuration and properties of adsorption complexes with approximately 500 selected organic substances follows. As far as these substances are homologues of certain functional groups, the change of basal distances depends upon the number of C-atoms.Aside from pure organic compounds, one can also form interlamellar complexes with a mixture of such compounds. Here again a rule of proportion between the number of C-atoms and the basal distance becomes evident. Another variant is the mixed interlamellar complexing of water with organic compounds and the re- and de-hydration reactions of these products.The report discusses the bonding conditions of various functional organic groups to the inorganic lattice. Furthermore, a series of homopolar organic derivatives of the tetracalcium aluminate hydrates can be produced. As is known, the existence of such compounds of clay minerals is a subject of dispute.

Extraction of Cerium from Nitric Acid Solutions with tertiary amines

AbstractThe system R3NHNO3Ce(NO3)3 was investigated. The partition of cerium(III) between nitric acid solutions and solutions of tri‐n‐dodecylamine (TDA) in odourless kerosene has been studied by varying the nitric acid, amine and salting‐out agents concentrations. The obtained data are compared with those for neutral phosphorus organic compounds as well as for solid anion exchange resins. The mechanism of cerium extraction is discussed in the light of these results. Cerium extraction in the presence of uranium was also investigated.

Relationship between diffusion constants and molecular weight

The diffusion constants of electrically neutral organic compounds of compact structure can be presented by an empirical equation of the form D= a M 1 3 + b M 2 3 + c M a, b and c are constants and M is the molecular weight. From this equation it is suggested that the diffusion constant is a function of the radius of the molecule, its area and its volume.