12 research outputs found
Investigations of Tll Suspensions
Thallous iodide suspensions were obtained by direct mixing
of TlN03 and Na! solutions. The amount of TH was kept constant
in the systems, while the concentrations of Na! (in excess), laurylamine
nitrate (LAN) or myristylamine nitrate (MAN) were varied.
Tyndallometric values were recorded as the function of Na!, LAN,
and MAN concentrations respectively, for suspensions aged for
various times. Particle sizes of differently aged TH in \u27Suspensions
containing Na! and Eu(N03)a in solution were determined. Tyndal.:.
lometry and electronmicroscopy showed fast particle growth of
TH in suspension. After about 10 minutes the TH particle grew up
to 1.3 Ī¼. The zero point of charge, determined by microelectrophoresis,
was attained at 0.001-0.005 M Na! and 0.0001-0.0005 M
LAN depending on the conditions under which the system had
been prepared. The results of radiometrically recorded adsorption-
desorption equilibria show a constant increase of the adsorption
capacity as the electrolyte concentration increases
On Some Properties of Silver Iodide
In order to obtain the relation between several factors affecting
the colloido-chemical properties of silver iodide in the heterogeneous
exchange processes, the following measurements were carried
out: determination of the adsorption capacity of silver iodide (radiometry)
tempered from 20 up to 400 Ā°c, dry aged for 20 days to 5
years, pressed at 500 and 1500 kg cm-2 (on dried isoelectric precipitate);
determination of the relation between particle size (electron
microscopy) and crystallite size (X-ray diffraction analysis), and
of the adsorption capacity of AgI (formed by dilution of KI + AgI
complex solution) in the presence of sodium laurylsulphate (SLS);
determination of the surface area (BET) of the tempered isoelectric
dried silver iodide; determination of particle size and determination
of the volume fraction of cubic and hexagonal modifications
of AgI in the tempered samples. In conclusion, the effect of the inner
surface as a possible relevant factor for the elucidation of the
influence of surface active substances on acceleration of the
exchange rate is pointed out. Interactions with sodium laurylsulphate
are also discussed
Radiometric Determination of Agl-TlI-(1311), Agl-HgI2-(1311), and HgI2-TlI-(1311) Systems
The principle and procedure for radioanalytical determination
of intermolecular interactions in a polycomponent system of Ā»Solid-
liquid: type is described. As models AgI-TlI-(131!), AgI-Hglr(
131!), and HgI2-TlI-(131I) systems were used. The AgI-TlI-(1311)
system was analysed in detail and radioanalytical results obtained
were compared using X-ray analysis, conductivity and micro differential
thermal analysis. Of the other two systems the results
obtained were compared only with the remlts of X-ray analysis.
As all the results obtained agree with literature data, it is
concluded that the described radioanalytical method is applicable
for adequate analysis of intermolecular interactions in mixed
systems
On Ā»Silver Iodide + SurfactantĀ« Systems
The effects of three different groups of surfactants are discussed:
the ionic nonconstituent, the ionic constituent and the nonionic
nonconstituent surfactants. On the basis of graphs: electrophoretic
mobility vs. concn., turbidity vs. concn. and fraction of exchange
vs. log of exchange time, four different types of systems can be
distinguished
Radiometric Analysis of Silver Iodide Sols
With the ultimate goal to investigate (a) the formation of the
solid phase by precipitation from electrolytic solutions, and (b)
processes characteristic of the interaction between the solid phase
and the electrolytic solution, the well-known radiometric methods
of analyses have been applied, as well as new radiometric methods
for the analysis of colloidal system developed. The methods applied
are extremely sensitive, selective, and accurate. The new methods
have been checked up by comparison of the obtained results with
the standard classical methods, such as X-ray diffraction, turbidimetry,
conductometry, differential thermic analysis, and also by
published data