Mechanism of streaming current generation by concentration gradients in packed-particle columns

Experimental investigation of the streaming current generated by the liquid mobile phase inside the chromatographic separation column packed with solid particles revealed that the measured streaming current changes only when the zones of analytes are leaving the column. This characteristic can be understood from basic electrodynamic properties of the particle–medium interface. Local double-layer compositions inside and outside the analyte zone, the corresponding electrokinetic behavior, and the dynamics of the double-layer adjustment to variations in the local composition of the flowing liquid are considere

Mechanism of streaming current generation by concentration gradients in packed-particle columns

Experimental investigation of the streaming current generated by the liquid mobile phase inside the chromatographic separation column packed with solid particles revealed that the measured streaming current changes only when the zones of analytes are leaving the column. This characteristic can be understood from basic electrodynamic properties of the particle–medium interface. Local double-layer compositions inside and outside the analyte zone, the corresponding electrokinetic behavior, and the dynamics of the double-layer adjustment to variations in the local composition of the flowing liquid are considere

Capillary electrophoresis of boron cluster compounds in aqueous and non-aqueous solvents

The electrophoretic properties of boron cluster compounds were determined in water, methanol and ACN as solvents of the BGE and discussed based on the principles of ion migration. Two types of boron cluster compounds were investigated. One type consisted of derivatives of the nido-7,8-dicarbaundecaborate cluster, the other types are derivatized cobalt bis(dicarbollide) ions (COSANs) whose central cobalt atom is sandwiched by two 7,8-dicarbaundecaborate clusters. The BGE in all solvents was acetate/acetic acid buffer with pH 4.75 in water, 9.7 in methanol and 22.3 in ACN, respectively, at different ionic strength between 5 and 30 mM. The dependence of the mobility on ionic strength could not be explained by the theory of Debye, Hückel and Onsager, but good agreement was found upon considering an ion size parameter. Limiting mobilities were derived by curve fitting, and by the aid of the solvent viscosities the hydrodynamic radii of the analyte anions were calculated. They are between 0.25 and 0.48 nm, and were nearly independent of the solvent. Electrophoresis of the analytes in a BGE consisting of 6 mM perchloric acid in ACN allows the conclusion that the present boron cluster compounds behave as stronger acids than perchloric acid

Cross sections of nuclear isomers from the interaction of protons with the thin thorium target

The paper shows the results of experimental gamma spectra obtained with a thorium 232Th target and an aluminum collector irradiated at the JINR Synchrocyclotron with the internal beam of energies of 100 and 600 MeV. For 232Th there were identified 258 and 222 gamma lines that belong to 45 and 55 nuclides, respectively. For Al - 238, 330 lines and 81, 119 nuclides, respectively. The cross sections of fragmentation of the 232Th and Al nuclei under the interaction with protons 100 and 600 MeV was determined. A comparison of the obtained cross sections of the reaction with theoretical calculations was performed

Cross sections of nuclear isomers from the interaction of protons with the thin thorium target

The paper shows the results of experimental gamma spectra obtained with a thorium 232Th target and an aluminum collector irradiated at the JINR Synchrocyclotron with the internal beam of energies of 100 and 600 MeV. For 232Th there were identified 258 and 222 gamma lines that belong to 45 and 55 nuclides, respectively. For Al - 238, 330 lines and 81, 119 nuclides, respectively. The cross sections of fragmentation of the 232Th and Al nuclei under the interaction with protons 100 and 600 MeV was determined. A comparison of the obtained cross sections of the reaction with theoretical calculations was performed