Surface area correction

SI BET surface area corrected for mass gain with silanization, Eq. (1)... 

C.K. Kim, N.C. Gupta, B. Chandramouli, A. Alavi, Standardized uptake values of FDG Body surface area correction is preferable to body weight correction, J. Nucl. Med. 35(1) (1994) 164-167. 

Using the surface area correction of 1/2, we also closely match concentration-time curves for similar experiments reported by these authors in subsequent publications (17, 18) as shown for the results of Terjesen (17) in Figure 8. 

Figure 8. Comparison of simidated and observed calcium time curve of Terjesen et al. (17) in a free drift run at 0.97 atm CO2 and 25°C. The solid line represents the simulated reaction using the same surface area correction as found for the free drift experiments of Erga and Terjesen (15).

CTAB Measure of the specific surface area corrected for the effect of... 

CTAB Measure of the specific surface area corrected for the effect of micropores. CTAB (cetyltrimethylene ammonium bromide) is excluded from the smaller interstices and thus better represents the portion of a particle surface area in contact with the polymer. 

Fig. 1.2.2a,b. Functional evaluation for 3-month-old boy shown in Figure 1.2.1. a Relative signal intensity versus time curve showing curves for the aorta and both kidneys. Note the symmetric parenchymal curves with equivalent perfusion, concentration and excretion of contrast agent, b The Patlak plot is used as an index of the individual kidney GFR. The slope of each plot reflects the GFR of each kidney (12.7 ml/min on left and 12.1 ml/min on right). They intercept represents the fractional blood volume of each kidney. The body surface area corrected Patlak (BSA Patlak) is 102 ml/min. The Patlak DRF is calculated at 50 50... 

The minimum value of the BET surface area correctly determined by either static or flow method may be derived as follows. The adsorbed amount is evaluated as the difference between the amount introduced in the cell, and the gas phase remaining in the dead space. The main uncertainty about the device volumes concerns the cell dead space. So, the following ratio ... 

The general type of approach, that is, the comparison of an experimental heat of immersion with the expected value per square centimeter, has been discussed and implemented by numerous authors [21,22]. It is possible, for example, to estimate sv - sl from adsorption data or from the so-called isosteric heat of adsorption (see Section XVII-12B). In many cases where approximate relative areas only are desired, as with coals or other natural products, the heat of immersion method has much to recommend it. In the case of microporous adsorbents surface areas from heats of immersion can be larger than those from adsorption studies [23], but the former are the more correct [24]. 

Following the pioneer work of Beebe in 1945, the adsorption of krypton at 77 K has come into widespread use for the determination of relatively small surface areas because its saturation vapour pressure is rather low (p° 2Torr). Consequently the dead space correction for unadsorbed gas is small enough to permit the measurement of quite small adsorption with reasonable precision. Estimates of specific surface as low as 10 cm g" have been reported. Unfortunately, however, there are some complications in the interpretation of the adsorption isotherm. 

Fundamental models correctly predict that for Group A particles, the conductive heat transfer is much greater than the convective heat transfer. For Group B and D particles, the gas convective heat transfer predominates as the particle surface area decreases. Figure 11 demonstrates how heat transfer varies with pressure and velocity for the different types of particles (23). As superficial velocity increases, there is a sudden jump in the heat-transfer coefficient as gas velocity exceeds and the bed becomes fluidized. 

The precious metal or metal oxide imparts high intrinsic activity, the carrier provides a stable, high surface area for catalyst dispersion, and the mechanical support gives a high geometric surface area for physical support and engineering design features (20). Only the correct combination of these... 

Surface filters, if manufactured from the correct material, will not be affected by water in the oil. Water-resistant pleated-paper elements have much greater surface areas than the depth-type element and yield a much lower differential pressure when used as replacement elements in filters originally equipped with depth-type elements. Pleated-paper elements are available that will remove particle sizes down to a nominal one-half micron. 

Now taking (Cm) as the concentration of the moderator and (cp) the total chromatographically available surface area, then the corrected retention volume (V r)... 

It is seen, from equation (5), that a graph relating the reciprocal of the corrected retention volume to the concentration of the moderator can provide values for the adsorption/desorption coefficient and the surface area of the stationary phase. Scott and Simpson [1] used this technique to measure the surface area of a reversed phase and the curves relating the reciprocal of the corrected retention volume to moderator concentration are those shown in Figure 2. 

---