Open-ended capillary

Take up each dye residue in one or two drops of ammonia solution (prepared by diluting 1 mL of concentrated ammonium hydroxide to 100 mL). Using open-ended capillary tubes, spot each color onto both a cellulose TLC plate and a silica gel TLC plate at about 3 cm from the bottom edge. 

An analysis of the PVP transport using open-ended capillary technique (with capillary dimensions 0.92 mm in diameter and 10 mm high) has in fact clearly demonstrated the time dependence of the apparent diffusion coefficient of the [3H]PVP 360 transport (Fig. 6). On the other hand, the transport behaviour of trace quantities... 

Fig. 6. Variation of Tc with time (transport coefficient obtained from diffusion analysis of results from open-ended capillary) for the [3H]PVP 360 ( ) and [uC]sorbitol (O) transport in standard solution systems (described in the legend to Fig. 5) 47>...

An alternative approach, possibly better suited to tiny volumes, is that of capillary electrophoresis [19], which is highly efficient and fast, and has low operational cost. In capillary electrophoresis, an open-ended capillary, filled with the sample solution, links two buffer solutions. Voltages of the... 

THE MEASUREMENT OF SELF-DIFFUSION COEFFICIENT IN DIELECTRIC LIQUIDS USING THE METHOD OF OPEN-ENDED CAPILLARIES AND RADIOISOTOPE TECHNIQUE. 

Mutual differential diffusion coefficients of binary (e.g. [6-8]) and pseudo binary systems (such as, e.g., cobalt chloride in aqueous solutions of sucrose [9]), have been measured using a conductometric cell and an automatic apparatus to follow diffusion. This cell uses an open-ended capillary method and a conductometric technique is used to follow the diffusion process by measuring the resistance of the solution inside the capillaries, at recorded times. Figure 1 shows a schematic representation of the open-ended capillary cell. 

Fig. 49c. The Ca atoms were preferentially located at the C4 site. At this stage, most of the H2O molecules have been released and H2O vapor likely removed through the open-ended capillary. 

Diffusion measurements were also used to estimate the overall hydration numbers of the trivalent Am, Cm, Cf and Es ions (Fourest et al. 1982,1983,1984,1988, Latrous et al. 1982). The open-end capillary method was claimed to have an accuracy better than 1% for y-emitters and 1-2% for a-emitters. The results are included in table 3. Comparison of the data obtained by the electrophoretic and the diffusion methods reflect the uncertainty of the measurements e.g., the individual h values for the Ln(III) cations are roughly the same for both methods while those for the An(III) cations from the diffusion measurements are lower than those from electrophoresis. 

The open-ended capillary technique is used for determining the diffusivity of self-diffusing ions in dilute solutions [23,28]. The capillary shown in Figure 4.10 has stationary boundaries in the liquid medium and an open upper end where ions (solute) interactions take place due to diffusiorL... 

A third popular method of measuring diffusion coefficients in the liquid state (especially self-diffusion coefficients of ions in dilute solution) is the open-ended capillary of Anderson and Saddington [23]. Here, as shown in Figiue 13.3, a capillary of length L, closed at the bottom, is filled with solution of a known and... 

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