Pressure Dependence of the Selfassociation of 9-Methylpurine in Aqueous Solution

1976 ◽  
Vol 80 (7) ◽  
pp. 607-614 ◽  
Author(s):  
U. Gaarz ◽  
H.-D. Lüdemann
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence

Pressure dependence of sound absorption in an aqueous solution of CaSO4

1983 ◽  
Vol 73 (S1) ◽  
pp. S50-S50
Author(s):  
C. C. Hsu ◽  
F. H. Fisher
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence ◽  
Sound Absorption

Pressure Dependence of the Electrode Potentials of Some Iron(III/II), Cobalt(III/II), and Ni(III/II) Couples in Aqueous Solution: Estimation of the Reaction Volumes for M(III)/M(II) Couples

1997 ◽  
Vol 52 (9) ◽  
pp. 1087-1093 ◽  
Author(s):  
Mitsuru Matsumoto ◽  
Toshiyasu Tarumi ◽  
Isao Takahashi ◽  
Shigenobu Funahashi ◽  
Toshiaki Noda ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence ◽  
Reference Electrode ◽  
Partial Molar Volumes ◽  
Spherical Approximation ◽  
Mean Spherical Approximation ◽  
Nernst Equation ◽  
Electrode Potentials ◽  
The Mean ◽  
Reaction Volumes

Abstract Pressure dependence of the electrode potentials for various M 3+/2+ couples (M = Fe, Co, and Ni with o-phenanthroline, bipyridine, terpyridine, 1,4,7-triazacyclononane, and 1,4,7-tri-thiacyclononane) was measured by cyclic voltammetry in aqueous solution vs. a Ag/AgCl reference electrode. The reaction volume of the Ag/AgCl reference electrode was estimated from the change in the partial molar volumes of Feaq3+/2+ and Co(terpyridine)23+/2+ couples, and the volumes for the formation of M2+ from M3+ were determined. The electrostrictive component for the change in the oxidation state for the M3+/2+ couple was calculated on the basis of the Drude-Nernst equation and by the mean spherical approximation (MSA). The isolated volumes for the formation of M2+ from M3+ were compared with the values predicted by theory.

ChemInform Abstract: PRESSURE DEPENDENCE OF THE SELF-ASSOCIATION OF 9-METHYLPURINE IN AQUEOUS SOLUTION

1976 ◽  
Vol 7 (43) ◽  
pp. no-no
Author(s):  
U. GAARZ ◽  
H.-D. LUEDEMANN
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence ◽  
The Self ◽  
Self Association

Pressure dependence of sound absorption in an aqueous solution of calcium sulfate

1983 ◽  
Vol 87 (14) ◽  
pp. 2581-2584
Author(s):  
C. C. Hsu ◽  
F. H. Fisher
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence ◽  
Calcium Sulfate ◽  
Sound Absorption

The pressure dependence of rates of homolytic fission of metal–ligand bonds in aqueous solution

1986 ◽  
Vol 64 (11) ◽  
pp. 2168-2170 ◽  
Author(s):  
Koji Ishihara ◽  
Thomas Wilson Swaddle
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence ◽  
Homolytic Decomposition ◽  
Homolytic Fission ◽  
Aqueous Hclo ◽  
Metal Ligand

The volume of activation for the exclusively homolytic decomposition of protonated 4-pyridylmethylchromium(III) ion in aqueous HClO4 at 63.4 °C is +19 cm3 mol−1, with negligible dependence on pressure up to 350 MPa at least. The origins of the strongly positive volumes of activation that characterize homolysis of complex cations in aqueous solution are examined.

Pressure-Dependence of Poly(N-isopropylacrylamide) Mesoglobule Formation in Aqueous Solution

2017 ◽  
Vol 6 (11) ◽  
pp. 1180-1185 ◽  
Author(s):  
Bart-Jan Niebuur ◽  
Kora-Lee Claude ◽  
Simon Pinzek ◽  
Coleman Cariker ◽  
Konstantinos N. Raftopoulos ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Pressure Dependence

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

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