Pore size distribution analysis

A Two-Stage Horvath-Kawazoe Adsorption Model for Pore Size Distribution Analysis... 

A two-stage Horvath-Kawazoe adsorption model for pore size distribution analysis... 

Lastoskie, C.M., Gubbins, K.E. and Quiike, N.J., Pore size distribution analysis of microporous carbons a density functional theory approach. J. Phys. Chem. 97 (1993) 4786. Olivier, J.P., Modeling physical adsorption on porous and nonporous solids using density functional theoiy. J. Porous Materials 2 (1995) 9. 

C. Lastoskie, K.E. Gubbins and N. Quirke, Pore size distribution analysis and networking studies of microporous sorbents, in J. Rouquerol, F. Rodriguez-Reinoso, K.S.W. Sing and K.K. Unger (Eds.), Characterization of Porous Solids III, Studies in Surface Science... 

Figure 2. A comparison of the nitrogen pore size distribution analysis for Ca, NaA (5A), NaX and an Al-PILC obtained using an Omnisorb 360 in the partial pressure range of 10 5 to 10 3. The relative order of the pore sizes is in good agreement with other experiments.

Ustinov, E. D. Do, and V. Fenelonov, Pore size distribution analysis of activated carbons application of density functional theory using nongraphitized carbon black as a reference system. Carbon. 2006. 44(4), 653-663. 

Okhovat, et al. Pore Size Distribution Analysis of Coal-Based Activated Carbons Investigating the Effects of Activating Agent and Chemical Ratio, ISRN Chemical Engineering 2012. 

FIGURE 2.68 (a) Relative NMR spin-eeho intensities versus temperature for cyclohexane confined within the pores of titania spherical particles (b) pore size distribution curves of the MTx samples determined by H NMR cryoporometry and BJH method (dashed fines) (c) insert with field-emission (FE) SEM image of MT400. (Adapted with permission from Ryu, S.-Y., Kim, D.S., Jeon, J.-D., and Kwak, S.-Y., Pore size distribution analysis of mesoporous TiOj spheres by H nuclear magnetic resonance (NMR) cryoporometry, J. Phys. Chem. C 114,17440-17445, 2010, Copyright 2010 American Chemical Society.)... 

Ryu, S.-Y., Kim, D.S., Jeon, J.-D., and Kwak, S.-Y. 2010. Pore size distribution analysis of mesoporous TiOj spheres by H nuclear magnetic resonance (NMR) cryoporometry. J. Phys. Chem. C114 17440-17445. 

Porosity can be used to describe the pore distribution and pores size associated with an LDH. Pore distribution is related to the method of LDH formation (383) and ions associated with the material, whereas pore size is related more to the method of preparation and interconnection of LDH platelets. The porosity of a material is commonly analyzed by N2 adsorption/desorption and pore size distribution analysis. N2 adsorption/desorption isotherms are a plot of the volume of N2 adsorbed versus relative pressures. Pore size distributions are calculated using the Barrett, Joyner, and Halenda method based on the isotham data (385). 

Lastoskie C, Gubbins KE, QuirkeN Pore size distribution analysis of microporous carbons a density functional theory approach, J Phys Chem 97(18) 4786-4796, 1993a. 

The nitrogen isotherms show that the carbons contain both micro- and mesoporosity. The templated carbons are predominantly mesoporous, whilst subsequent activation increases mainly the microporosity. The location and shape of the hysteresis loops suggest that the PRSD carbons contain larger mesopores than the PRIOO carbons pore size distribution analysis (not shown here) using the BJH method [2] suggests these to be centred aroimd ca. 8nm and 5nm respectively. 

Many of the properties of the cement paste are determined by its chemical nature and micro structure. Microstructure constitutes the nature of the solid body and that of the non-solid portion, viz., porous structure. Microstructural features depend on many factors, such as the physical and chemical nature of the cement, type and the amoimt of admixture added to it, temperature and period of hydration, and the initial w/c ratio. The solid phase study includes examination of the morphology (shape and size), bonding ofthe surfaces, surface area, and density. Porosity, pore shape, and pore size distribution analysis is necessary for investigating the non-solid phase. Many of the properties are interdependent, and no one property can adequately explain the physico-mechanical characteristics of cement paste. 

The random pore model of Wakao and Smith (1962) for a bidisperse pore structure may also be applied in order to estimate De. It was supposed that the porous solid is composed of stacked layers of microporous particles with voids between the particles forming a macroporous network. The magnitude of the micropores and macropores becomes evident from an experimental pore size distribution analysis. If Dm and Dp are the macropore and micropore diffusivities calculated from equations (4.9) and (4.10), respectively, the random pore model gives the effective diffusivity as... 

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