Experimental investigation and modelling of the solubility of calcite and gypsum in aqueous systems at higher ionic strength

2004 ◽  
Vol 219 (2) ◽  
pp. 219-229 ◽  
Author(s):  
Dieter Loos ◽  
Christoph Pasel ◽  
Michael Luckas ◽  
Klaus Gerhard Schmidt ◽  
Jan-Dirk Herbell
Keyword(s):  
Experimental Investigation ◽  
Ionic Strength ◽  
Aqueous Systems

Formation and Properties of Americium Colloids in Aqueous Systems

1981 ◽  
Vol 6 ◽  
Author(s):  
U. Olofsson ◽  
B. Allard ◽  
K. Andersson ◽  
B. Torstenfelt
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Storage Time ◽  
Large Fraction ◽  
Average Charge ◽  
Particle Sizes ◽  
Aqueous Systems ◽  
Ph Range ◽  
And Storage ◽  
Solution Changes

ABSTRACTThe formation and sorption properties of colloidal americium in aqueous solutions have been studied with variations of pH (2–12), ionic strength (0.01–1.0 M NaClO4), americium concentration (10−7 −10−11 M) and storage time (6 h–6 months). A large fraction of the americium is sorbed on the container walls or on Al2O3 in the pH-range 7–11. Around pH 5–8 and at pH above 12 centrifugable fractions (particle sizes greater than 100 nm) are obtained. The fraction formed at pH above 12, which seems to be a true hydroxide colloid, migrates through an A12O3-filled column with very little retention. The average charge of americium species in solution changes from positive values at pH below 7–8 to negative values at pH above 10–11, as indicated from electromigration studies.

The Viscosity and Rigidity of Gelatin in Concentrated Aqueous Systems. I. Viscosity

1952 ◽  
Vol 5 (1) ◽  
pp. 146 ◽  
Author(s):  
CWN Cumper ◽  
AE Alexander
Keyword(s):  
Ionic Strength ◽  
Aqueous Systems ◽  
Predominant Factor ◽  
Concentrated Systems

The viscosity of gelatin solutions at concentrations between 100 and 500 g./l. has been studied as a function of pH, ionic strength, and temperature. In these concentrated systems the predominant factor determining the viscosity appeared to be Coulombic forces between ionized groups on adjacent chains.

Colloidal stability of chitin nanofibers in aqueous systems: Effect of pH, ionic strength, temperature & concentration

2020 ◽  
Vol 235 ◽  
pp. 116024 ◽  
Author(s):  
Ruchira N. Wijesena ◽  
Nadeeka D. Tissera ◽  
V.W.S.G. Rathnayaka ◽  
Rohini M. de Silva ◽  
K.M. Nalin de Silva
Keyword(s):  
Ionic Strength ◽  
Colloidal Stability ◽  
Aqueous Systems ◽  
Effect Of Ph ◽  
Chitin Nanofibers

The ionic strength dependence of chromatin folding

1978 ◽  
Vol 36 (2) ◽  
pp. 220-221
Author(s):  
F. Thoma ◽  
TH. Koller
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Ionic Strength ◽  
Specimen Preparation ◽  
Preparation Technique ◽  
Carbon Supports ◽  
Ionic Strength Dependence ◽  
Chromatin Folding ◽  
Strength Dependence ◽  
Preparation Techniques

Under a variety of electron microscope specimen preparation techniques different forms of chromatin appearance can be distinguished: beads-on-a-string, a 100 Å nucleofilament, a 250 Å fiber and a compact 300 to 500 Å fiber.Using a standardized specimen preparation technique we wanted to find out whether there is any relation between these different forms of chromatin or not. We show that with increasing ionic strength a chromatin fiber consisting of a row of nucleo- somes progressively folds up into a solenoid-like structure with a diameter of about 300 Å.For the preparation of chromatin for electron microscopy the avoidance of stretching artifacts during adsorption to the carbon supports is of utmost importance. The samples are fixed with 0.1% glutaraldehyde at 4°C for at least 12 hrs. The material was usually examined between 24 and 48 hrs after the onset of fixation.

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