ChemInform Abstract: THE STANDARD POTENTIAL OF COPPER AMALGAM ELECTRODE AND THE ACTIVITY COEFFICIENT OF COPPER SULFATE IN AQUEOUS SOLUTION

1978 ◽  
Vol 9 (36) ◽  
Author(s):  
S. O. AJAYI ◽  
F. E. W. WIGWE
Keyword(s):  
Aqueous Solution ◽  
Activity Coefficient ◽  
Copper Sulfate ◽  
Standard Potential ◽  
Amalgam Electrode

scholarly journals Molluscicide activity of the "Avelós" plant (Euphorbia tirucalli, L. ) on Biomphalaria glabrata, the mollusc vector of schistosomiasis

1985 ◽  
Vol 80 (4) ◽  
pp. 423-427 ◽  
Author(s):  
Pedro Jurberg ◽  
Januário Bispo Cabral Neto ◽  
Virgínia T. Schall
Keyword(s):  
Aqueous Solution ◽  
Copper Sulfate ◽  
Active Substance ◽  
Simple Procedure ◽  
Biomphalaria Glabrata ◽  
Wide Distribution ◽  
Euphorbia Tirucalli ◽  
Promising Agent

An aqueous solution of the latex of Euphorbia tirucalli collected at sites receiving large amounts of sunlight showed molluscicide action on Biomphalaria glabrata, with LD50 obtained at the concentration of 28,0 ppm and LD90 at the concentration of 85,0 ppm. The toxicity of the product for fish was similar to that of Bayluscide and of copper sulfate used for comparison. However, the wide distribution of the plant, its easy propagation and the simple procedure for extraction of the active substance, which is biodegradable, favor "avelós" as a promising agent in the control of schistosomiasis.

The diffusion of electrolytes in a cation-exchange resin membrane I. Theoretical

1955 ◽  
Vol 232 (1191) ◽  
pp. 498-509 ◽  
Keyword(s):  
Aqueous Solution ◽  
Activity Coefficient ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Volume Fraction ◽  
Cation Exchange Resin ◽  
Physical Nature ◽  
Concentration Difference ◽  
Flow Through ◽  
Resin Membrane

An equation for the flux of electrolyte through a water-swollen cation-exchange resin membrane separating two solutions of the same electrolyte at different concentrations is derived on the basis of several assumptions regarding the physical nature of a swollen resinous exchanger. The complete flux equation contains three terms, one determined by the concentration difference across the membrane, another determined by the variation of the activity coefficient of the electrolyte with concentration in the membrane and a third concerned with the rate of osmotic or hydrostatic flow through the membrane. If ions in the resin are transported entirely in an internal aqueous phase, the mobilities required for the flux equation can be related to mobilities in aqueous solution and to the volume fraction of resin in the swollen membrane. The treatment is readily extended to anion exchangers.

Circuit Pattern cu Deposition on Polyimide Surface Using ArF Excimer Laser

1998 ◽  
Vol 546 ◽  
Author(s):  
M. Tomita ◽  
M. Murahara
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Excimer Laser ◽  
Copper Sulfate ◽  
Electroless Plating ◽  
Atmospheric Pressure ◽  
Hydrogen Atoms ◽  
Arf Excimer Laser ◽  
Cu Thin Film ◽  
Copper Substitution

AbstractCircuit patterned nucleation of copper atoms onto polyimide surface was demonstrated by using ArF excimer laser (λ =193nm) and copper sulfate aqueous solution at an atmospheric pressure. Photo-excited C-H bonds of the polyimide surface were effectively dehydrated with hydrogen atoms which were photodissociated from the water. The dangling bonds of the dehydrated hydrogen atoms were combined with the oxygen and the copper atoms which were photodissociated by copper-sulfate aqueous solution. Thus, C-O-Cu bonds were formed on the surface. After this copper substitution, it was carried out onto the nucleated parts by usual electroless plating at 70°C. In this process, the conductive circuit pattern Cu thin film was deposited on polyimide surface.

Velocity and Morphology Transition in Dendritic Growth

1991 ◽  
Vol 237 ◽  
Author(s):  
E. Raz ◽  
A. Chait
Keyword(s):  
Aqueous Solution ◽  
Transition Temperature ◽  
Copper Sulfate ◽  
Growth Velocity ◽  
Dendritic Growth ◽  
Equilibrium Temperature ◽  
Growth Direction ◽  
Interface Temperature ◽  
Sulfate Concentration ◽  
Shape Changes

ABSTRACTThe growth velocity and morphology of crystals growing in a supercooled aqueous solution of ammonium chloride (28 wt%) with small amounts of copper sulfate (0.05 to-1 wt%) have been examined. For the [100] growth direction at low supercooling and for the [110] direction at greater supercooling the crystals start to grow slowly with a faceted interface. As the supercooling is continuously increased, the growth direction becomes [111]. Dendrites with pointed tips develop but continue to grow slowly. With further increase in supercooling, the velocity increases 20- to 40-fold and the tip shape changes from a cusp to a thin and almost paraboloid interface while the growth direction remains [111]. The velocity transition is gradual when the concentration is below 0.1 wt% but is sharper at higher concentrations. The transition temperature decreases with increasing copper sulfate concentration.We postulate that the observed transition indicates a dynamic roughening phenomenon, where the supercooling; is sufficiently high to create many nucleation islands on the faceted interface. In this case the interface behaves as an atomically rough surface and dendrite growth occurs at an interface temperature that is below the equilibrium temperature.

The Reaction of Zinc with Copper Sulfate in Aqueous Solution

1939 ◽  
Vol 61 (7) ◽  
pp. 1798-1804 ◽  
Author(s):  
F. W. van. Straten ◽  
W. F. Ehret
Keyword(s):  
Aqueous Solution ◽  
Copper Sulfate
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