Volume changes for ionization of formic, acetic, and butyric acids and the glycinium ion in aqueous solution at 25.deg.

1969 ◽  
Vol 73 (5) ◽  
pp. 1220-1232 ◽  
Author(s):  
Edward Jasper King
Keyword(s):  
Aqueous Solution ◽  
Volume Changes

Temperature dependence of volume changes on glycine-PEG and L-alanine-PEG in aqueous solution

1995 ◽  
Vol 273 (8) ◽  
pp. 782-786 ◽  
Author(s):  
K. Sasahara
Keyword(s):  
Aqueous Solution ◽  
Temperature Dependence ◽  
Volume Changes

Apparent molar volumes in dilute aqueous propanol solutions

1965 ◽  
Vol 18 (5) ◽  
pp. 605 ◽  
Author(s):  
DM Alexander ◽  
DJT Hill
Keyword(s):  
Aqueous Solution ◽  
Apparent Molar Volumes ◽  
Volume Changes ◽  
Molar Volumes ◽  
Dilute Aqueous Solution ◽  
Structural Volume

Apparent molar volumes of propan-2-ol have been determined in dilute aqueous solution from 0� to 80�. Structural volume changes in propan-1-ol and propan-2-ol solutions are discussed and related to compressibilities.

Volume Changes in the Proton Ionization ofω-Aminocarboxylic Acids in Aqueous Solution *

1980 ◽  
Vol 123 (1) ◽  
pp. 51-66 ◽  
Author(s):  
Luciano Lepori ◽  
Vincenzo Mollica
Keyword(s):  
Aqueous Solution ◽  
Volume Changes

Micellar properties of disodium 4-alkyl 3-sulfonatosuccinates, two-headed anionic surfactants

1984 ◽  
Vol 37 (2) ◽  
pp. 303 ◽  
Author(s):  
DJ Jobe ◽  
VC Reinsborough
Keyword(s):  
Aqueous Solution ◽  
Anionic Surfactants ◽  
Binding Constants ◽  
Aqueous Environment ◽  
Volume Changes ◽  
Micellar Properties ◽  
Aggregation Numbers ◽  
Counter Ion

Density, viscosity, conductance, dye solubility, and carbon-13 n.m.r. studies were performed in aqueous solution of three disodium 4-alkyl 3-sulfonatosuccinate surfactants at 25.0�C. The CMC values were 0.33 mol dm-3 for the hexyl homologue (dhss), 0.14 mol dm-3 for the octyl homologue(doss), and 0.041 mol dm-3 for the decyl homologue (ddss). The aggregation numbers determined viscometrically and conductimetrically were 15 for dhss, 29 for doss, and 50 for ddss. The volume changes upon micellization were 7.0 cm3 mol-1 for dhss, 8.8 cm-3 mol-1 for doss, and 9.1 cm3 mol-1for ddss. Binding constants for the dye pada to the micelle and the fractions of unbound counter-ion were also obtained. The two polar heads with their carbon linkage were likely in an aqueous environment in the doss micelles with the micelles themselves being spherical.

Theoretical study of volume changes associated with the helix-coil transition of an alanine-rich peptide in aqueous solution

Biopolymers ◽  
2005 ◽  
Vol 79 (2) ◽  
pp. 97-105 ◽  
Author(s):  
Takashi Imai ◽  
Takahiro Takekiyo ◽  
Andriy Kovalenko ◽  
Fumio Hirata ◽  
Minoru Kato ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Theoretical Study ◽  
Volume Changes ◽  
Coil Transition

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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