X-Ray Diffraction Analysis of Differently Prepared AgI. IV

The cubic/hexagonal ratio of Ag! formed by dilution of a solution of silver iodide in Na! and AgN03 solutions respectively, and the cubic/hexagonal ratio of Ag! formed in statu nascendi in mixed solvents has been investigated. The complex solution of Ag! + Na! (1, 2, 3, 4, and 8 M Na!) was diluted with water to 0.01 M Na!. The formed mixtures of cubic and hexagonal Ag! contained less cubic Ag! in systems of lower initial concentrations of Na! as compared with those of higher initial concentrations of Na!. By an increase in the amount of Ag! at constant Na! concentration the amount of cubic Ag! decreased: by aging this amount increased. By dilution of a complex solution of Ag! + AgN03 a larger amount of cubic Ag! was formed when the initial concentration of AgN03 was lower (1 M as compared to 8 M AgNOa). In Ag! sols prepared in water-methanol and water-ethanol mixtures, the amount of cubic and/or hexagonal modifications of Ag! changes, by an increase in the percentage of alcohol, in another way than it does in water-dioxane and water-acetone systems. By comparing the changes of the dielectric constant of the medium, the surface tension and the solubility of Ag! it can be concluded that complexly dissolved Ag! is probably the factor which most influences the formation of a a or ~ structure of Ag!

X-Ray Diffraction Analysis of Differently Prepared AgI. IV

The cubic/hexagonal ratio of Ag! formed by dilution of a solution of silver iodide in Na! and AgN03 solutions respectively, and the cubic/hexagonal ratio of Ag! formed in statu nascendi in mixed solvents has been investigated. The complex solution of Ag! + Na! (1, 2, 3, 4, and 8 M Na!) was diluted with water to 0.01 M Na!. The formed mixtures of cubic and hexagonal Ag! contained less cubic Ag! in systems of lower initial concentrations of Na! as compared with those of higher initial concentrations of Na!. By an increase in the amount of Ag! at constant Na! concentration the amount of cubic Ag! decreased: by aging this amount increased. By dilution of a complex solution of Ag! + AgN03 a larger amount of cubic Ag! was formed when the initial concentration of AgN03 was lower (1 M as compared to 8 M AgNOa). In Ag! sols prepared in water-methanol and water-ethanol mixtures, the amount of cubic and/or hexagonal modifications of Ag! changes, by an increase in the percentage of alcohol, in another way than it does in water-dioxane and water-acetone systems. By comparing the changes of the dielectric constant of the medium, the surface tension and the solubility of Ag! it can be concluded that complexly dissolved Ag! is probably the factor which most influences the formation of a a or ~ structure of Ag!

Coagulation of Silver Iodide in the Presence of Tensides

In connection with silver iodide systems containing various tensides we can show an »irregular« behaviour of the negative silver iodide sol in the presence ofsodium n-dodecyl sulphate, SDS.1 The AgI-NaI-SDS system is formed in statu nascendi, i. e. by pouring the silver nitrate solution into the solution of sodium iodide + SDS (of specially pure grade BDH reagent)

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 »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

The safety of enoxaparine use in elderly with acute myocardial infarction

Background/Aim. Enoxaparin (ENOX), the lowmolecular- weight heparin, used in acute myocardial infarction (AMI) could lead to hemorrhage. The aim of this study was to determine whether bleeding was more often in AMI patients older than 65 or 75 years who receive ENOX or unfractionated heparin (UFH). Methods. Among the patients with AMI hospitalized during three successive months receiving ENOX or UFH, three group of parameters were investigated: demographic, ischemic and bleeding TIMI criteria. Results. Among 85 hospitalized patients with signs of AIM, there were 35 (41.2%) old 65 years or less, 32 (38.5) old 66-75 years and 18 (21.2%) older than 75 years. In AMI elderly patients, according to the received ENOX/UFH: ischemic complication (18.2 vs. 21.4%) were insignificantly lower and the number of lethal outcomes (18,2 vs. 17,8%) were insignificantly more often in ENOX group; represented only by one patient (age beyond 75 years), major and non-major bleeding events occurred only in UFH group. Conclusion. The ENOX usage in AMI in patients older than 65 years did not show any significant difference in efficacy and bleeding rate comparing to UFH

Heterogeneous Exchange of Mixed Precipitates. [Agl + PbI2] solid in KI Solution

The heterogeneous exchange process of mixed AgI + PbI2 precipitates with iodide from the KI solution was studied using 1311. The systems under examination were prepared in statu nascendi at 293 K. Radiometrically determined solubility, differential thermal analysis and X-o:-ay diffraction analysis data were compared with radi:oanalytical results of the heterogeneous exchange processes. The results show ,strong mutual dependence of the metal halides present throughout the exchange process. The quantitative analysis of radiometric data indicates the specific influence of lead iodide onto silver iodide particles during the Ostwald\u27s ripening process

X-ray Investigations in the System U-N-Te

The crystal structures of the ternary compounds in the system U-N-Te were investigated. The compounds were prepared in a powder form by reacting UN + X Te (0.4 ~ X ~ 2.0). Powdered uranium mononitride, UN, and elementary tellurium were mixed in the desired proportions and subsequently heated at 900-1000 °c in evacuated and sealed quartz tubes. The powder diagrams were taken with a Philips diffractometer (CuK, radiation)

On Negative Silver Iodide Sols in Sodium n-Laurylate Solutions

This paper describes a ·physico-chemical •study of the interaction between the anionic surfactant sodium n-laurylate NaL and the negative stable silver iodide prepared »in statu nascendi«, with emphasis on the colloid properties of the system in aqueous media. Negative stable silver iodide sols of 0.001 M contained NaL solutions from 0.0000001 M to 0.01 M with 0.001 M Na! at 20 °c. Turbidity measurements show the formation of two pronounced Tyndall maxima; eleatmn microscopy and X-ray diffraction analysis data show the dependence of crystallite sizes and sol dens·tties on the concentration of NaL. For the systems examined under ageing the results obtained indicate, as a reasonable possibility, that different effects of NaL on negative silver iodide sol in statu nascendi for systems with NaL below and above the critical micellar concentration can be proposed

The Preparation of Sodium Perchlorate Labelled with Chlorine-36

In order to investigate the effect of perchlornte ion on the thyroid glancP it was 111ecessary to rprepare 36 ~ 1 labelled sodium rperchlornte. The solution of 36Cl in the form of 4.5 ml. 2.1 N hydrochloric acid, with specific activity ca. 120 μc/g Cl obtained from Amernham (Code CIS. 1) was avadlable as the source of radiochlorine. With regard to the experimental results of Izgaryshev et al. 2 radioactive perchlorate was prepared by anodic oxydatio111 of Ca36 Cl 2

The Preparation of Sodium Perchlorate Labelled with Chlorine-36

In order to investigate the effect of perchlornte ion on the thyroid glancP it was 111ecessary to rprepare 36 ~ 1 labelled sodium rperchlornte. The solution of 36Cl in the form of 4.5 ml. 2.1 N hydrochloric acid, with specific activity ca. 120 μc/g Cl obtained from Amernham (Code CIS. 1) was avadlable as the source of radiochlorine. With regard to the experimental results of Izgaryshev et al. 2 radioactive perchlorate was prepared by anodic oxydatio111 of Ca36 Cl 2