Homogeneous mobility

This explains why the conductivity prefactor is quite close to the predictions of the homogeneous mobility edge model, even in the presence of fluctuations. 

Non-homogeneous mobile phase. (Drift usually to higher absorbance, rather than cyclic pattern from temperature fluctuation.)... 

SEPARATION NUMBER. A measure of the separating power of a TLC system The number of substances completely separated (resolution =1) between Rf = 0 and Rf = 1 by a homogeneous mobile phase (no solvent gradients in the direction of development). 

If, in LC, the mobile phase is a mixture of solvents, the pore contents will not be homogeneous. One solvent component, the one with stronger interactions with the stationary phase, will be preferentially adsorbed on the surface [10] relative to the other. Consequently, although the bulk of the contents the pores, (Vp(i)), will have... 

Fluidization may be described as incipient buoyancy because the particles are still so close as to have essentially no mobility, whereas the usual desire in fluidization is to create bed homogeneity. Such homogeneity can be achieved only by violent mixing. This is brought about by increasing the fluid velocity to the point of blowing "bubbles" or voids into the bed, which mix the bed as they rise. The increased fluid velocity at which bubbles form first is referred to as the incipient (or minimum) bubbling velocity. 

The chromatogram is freed from mobile phase and immersed in the dipping solution for 3 s or the solution is sprayed on homogeneously the chromatogram is then heated to 90 —140°C for 5 —10 min. Brown zones are produced on a beige-grey background. 

The chromatogram is freed from mobile phase in the drying cupboard (10 min, 120°C) and immersed for 1 s in the reagent solution or sprayed homogeneously with it until the plate starts to appear transparent it is then dried briefly in a stream of warm air and heated to 125 —130 °C for 45 min. 

The developed chromatogram is freed from mobile phase by heating to 110°C for 10 min in the drying cupboard. It is allowed to cool and immersed for 1 s in or sprayed homogeneously with the reagent the plate is then examined (while still moist). 

The chromatograms are freed from mobile phase, immersed in the dipping solution for 1 s or homogeneously sprayed with it until they begin to be transparent and then heated to 105 — 120 for 5—10 min. 

The chromatogram is freed from mobile phase, immersed for 3 s in dipping solution I or sprayed homogeneously with spray solution I and then dried for ca. 10 min in a stream of cold air. It is then immersed for 1 s in dipping solution II or sprayed evenly with spray solution II. 

Alkylating agents The chromatograms are freed from mobile phase, then sprayed homogeneously with spray solution I, dried briefly in a stream of cold air, sprayed homogeneously with spray solution II and then heated to 105 —140 °C for 10 — 25 min. After coohng to room temperature they are then sprayed with spray solution III [9,10]. 

The chromatogram is freed from mobile phase in a stream of warm air and either immersed for 2 s in the dipping solution or homogeneously sprayed with it until the layer begins to be transparent. In the case of detergents the chromatograms are evaluated while still moist [3], in the case of sweeteners after drying for 10 min in the dark [10]. 

The second condition is that the well-dispersed slurry forms a homogeneous bed by formation of the bed under well-controlled conditions. This is achieved by a two-step procedure where the bed is formed using constant velocity of the mobile phase and then stabilizing the bed at a constant pressure (Hagel, 1989). The rationale for the first step at constant velocity is that this will create uniform drag forces from the flowing liquid on the gel particles and thus... 

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