The present investigation was an exploratory one. Its main purpose was to determine whether or not acetone was a useful phase in the solvent extraction and the separation of some inorganic compounds. Lee (1) bas pointed out that acetone and a concentrated aqueous solution of calcium chloride constitute an unexplored but very interesting system for solvant extraction. This was the-system chosen for study. The investigation consisted in finding the affect of the concentration of calcium chloride and hydrochloric acid on the distribution ratios of metal chlorides and oxyacids. It is worth noting that the avaiàbility and relatively low cost of acetone and calcium chloride suggest that analytical separations might also have potential industrial applications. [...]

A versatile sampling technique is described which permits a more definitive study of ion extraction and plasma sheath formation in discharge plasmas. The ionic species from the plasma are sampled into a quadrupole mass spectrometer through a metal leak arrangement which itself acts as a Langmuir-type probe. This behaviour is substantiated by specific ion sampling probe characteristics for a microwave discharge plasma in flowing nitrogen at low pressures (9 to 27 microns). The beam of positive ions extracted from the microwave discharge source is composed of N^+, N2^+ and N3^+ ,N2^+ being the dominant ion. The kinetic energy distribution curves for individual ionic species are obtained under a variety of conditions of sampling probe potential, pressure, and electron temperature by a retarding potential applied to the entrance grid of the mass filter. The curves are discussed in terms of the currently accepted sheath model. The interpretations indicate that ion generation processes and ion-molecule collisions occurring in the sheath may strongly interfere with the sampling process.

The solution properties of polyelectrolytes are of fundamental importance in processes involving the interaction of colloidal material and water. Many of the gaps in the present understanding of such systems arise from the complexity of the variables governing the behaviour of macroions in solutions. This thesis describes an investigation on the electroviscous behaviour of a spherical charged colloid under well-defined conditions. [...]

A chemical transport reaction is a reaction taking place between a non-volatile solid and a transporter gas, in which intermediate volatile compounds are formed; these gaseous compounds move to a different part of the system where they react ad result in the reformation of the original solid material. [...]

The independant format ion cross-sections of ^139Ba, ^139ce, ^141La , ^141ce, and ^143ce and the cumulative formation cross-sections of ^139Cs, ^141Ba, and ^143La produced in the fission of natural uranium by protons of energies 20-85 MeV have been measured radiochemically. Excitation functions were constructed and the proton energies at which the excitation functions reach their maxima fall on a smooth curve when plotted against neutron-to-proton ratio of the product. Nuclear charge dispersion curves were constructed at 20, 30, 40, 50, 60, 70, 80, and 85 MeV. The general behaviour is similar to that observed by previous workers. With increasing proton energy the curves broaden and the most probable charge approaches the line of beta-stability. These phenomena are qualitatively explained in terms of neutron evaporation. Experimental yields showed good agreement when compared with Wahl's empirical charge distribution curve. It seems that charge dispersion can be very adequately represented in the form of a Gaussian distribution. [...]

This investigation is designed to elucidate the influence of surface charge of fibres upon flocculation of the fibre suspensions. To achieve this goal, experiments to measure the flocculating tendency and the surface charge of the fibre networks were consecutively performed on the same sample of fibre suspension. Electrolytes of various ionic species and different concentrations wre added to the supensions, and the effects on the corresponding properties were observed. [...]

The flow mechanism of concentrated suspensions of rigid particles undergoing slow Poiseuille flow was studied. It was shown that the deviations tram the parabolic velocity distribution arise from a wall effect of the type described by Vand. Particle accumulation behind an advancing meniscus is caused by the radial flow and particle-particle and particle-wall interactions. In many cases, the motions of particles were reversible when the direction of flow vas reversed. In dilute suspensions, the statistical properties of the particle paths were in good agreement with a theory of collision doublets based on reotilinear paths of approach and recession. [...]

The operating characteristics of a direct-current nitrogen plasma jet confined in an 8.00-in. i .d. graphite chamber were obtained for twenty power levels and flow rates of up to 36 kw. and 250 s.c.f.h. respectively. Gas velocity and temperature profiles were measured at a test section 10.5 in. below the entry of the jet, and the recirculation phenomenon was examined. [...]

The emission of multiply-charged fragments (Z > 3) in nu.c lear rea ct ions was f ir st recorded by Perk ins (1) who studied disintegrations caused by cosmic rays. Subsequently the production of complex particles has been observed in many nuclear reactions induced by projectiles with a wide range of energies. The emission of these fragments has been investigated with respect to fragment yield, charge, energy, and angular distribution, using counter, radiochemical, and emulsion techniques.

The micro-calorimetry of C$\sb{60}$ has been performed on a series of pure samples, and the enthalpy of formation $\{\Delta\sb{\rm f}$H$\sp{\rm o}\sb{\rm m}$ (cr)$\}$ for C$\sb{60}$ (cr) was found to be 579 $\pm$ 3.35 kcal mol$\sp{-1}$, or 9.65 $\pm$ 0.06 kcal mol$\sp{-1}$ per carbon, relative to standard state graphite. This can be converted to the standard enthalpy of formation $\{\Delta\sb{f}$H$\sp{\rm o}\sb{\rm m}$(g)$\}$ for C$\sb{60}$ of 635 $\pm$ 6.0 kcal mol$\sp{-1}$, or 10.6 $\pm$ 0.10 kcal mol$\sp{-1}$ per carbon atom, via the standard enthalpy of sublimation $\Delta\sb{\rm c}\sp{\rm g}$H$\sp{\rm o}\sb{\rm m}$(298.15 K). In the preparation of these samples, methodologies for the synthesis, isolation, purification, and testing of fullerenes have been developed.