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- Adsorption and Desorption Isotherms - The KE Research Group
Characteristic features of the Type IV isotherm are its hysteresis loop, which is associated with capillary condensation taking place in mesopores, and the limiting uptake over a range of high P P0
- Multiple equilibria description of type H1 hysteresis in gas sorption . . .
We report argon adsorption desorption isotherms of MCM-41 and of SBA-15 The shape of all hysteresis loops we have observed corresponds to type H1 The data have been analyzed quantitatively using the multiple equilibria description and applying the notion of metastable thermodynamic equilibrium
- BET adsorption isotherm hysteresis loop types and pore structure . . .
The H4-type hysteresis loop is somewhat similar to the H3-type hysteresis loop, but the adsorption branch is composed of a composite of type I and type II isotherms
- Types of adsorption isotherms (a), hysteresis loops and corresponding . . .
The isotherms of all samples are type IV and their hysteresis loops of type H3, which suggests that the materials have wedge-shaped pores [38]
- Sorption Hysteresis: A Statistical Thermodynamic Fluctuation Theory
Hysteresis is observed commonly in sorption isotherms of porous materials Still, there has so far been no unified approach that can both model hysteresis and assess its underlying energetics
- Hysteresis loops, classification - Big Chemical Encyclopedia
In practice, a wide variety of shapes may be encountered of which types HI and H4 are the extremes In the former, the two branches are almost vertical and parallel over an appreciable range of V, whereas in the latter they remain more or less horizontal over a wide range of p p (sat)
- Physisorption Hysteresis Loops and the Characterization of Nanoporous . . .
The considerable number of physisorption isotherms determined on these grades of MCM-41 over the past 10 years (see Rouquerol et al 1999) can be broadly divided into the three representative types shown in Figure 2
- Types h1-h4 and the characteristic features of types of
Figure 5 types H1-H4 and the characteristic features of types of loops are associated with the geometry and H4 hysteresis loops do not close until the equilibrium pressure is very close to, or at, the saturation pressure
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