A Model to Describe Adsorption Isotherms

Adolphs, Jürgen; Setzer, Μ.J.

doi:10.1006/jcis.1996.0274

Cited by 70 publications

(50 citation statements)

References 2 publications

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“…Brunauer et al (1979) pointed out that BET specific surface area is significantly affected by the prerequisite drying of HCP. However, because the applicable relative pressure range of the BET method is lower than 0.35, nano structure identification of C-S-H by BET method is limited and information based on entire relative pressure range is not available, which is nevertheless important to identify pore structure and nano structure of C-S-H. Adolphs and Setzer (1996a;1996b; proposed Excess Surface Work (ESW) model capable of covering entire relative pressure range while no attempt has been made to analyze HCP subjected to drying with the ESW model.…”

Section: Introductionmentioning

confidence: 99%

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Nano-structural Changes of C-S-H in Hardened Cement Paste during Drying at 50°C

Aono

Matsushita

Shibata

et al. 2007

ACT

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Pore structural changes in hardened cement pastes, subjected to drying and wetting/drying cycles, were studied at micrometer and nanometer levels. Characterization techniques included Nuclear Magnetic Resonance (NMR), nitrogen and water vapor adsorption, mercury intrusion porosimetry (MIP) and under-water weighing. Coarsening of pore structure was observed with MIP and increase in the true density of C-S-H was suggested by the result of under-water weighing. Decrease in specific surface area due to drying was observed with nitrogen adsorption, and water vapor adsorption associated with Excess Surface Work (ESW) analysis suggested a development of cohesive structure in C-S-H. NMR confirmed polymerization of silicate anion chains. The drying-induced coarsening of pore structure is probably attributed to polymerization of silicate anion chains and development of cohesive structure in C-S-H.

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Section: Introductionmentioning

confidence: 99%

“…Analysis was performed not only with BET method but also with the ESW model proposed by Adolphs and Setzer (1996a;1996b;. ESW Φ is defined with the following formulas,…”

mentioning

confidence: 99%

Nano-structural Changes of C-S-H in Hardened Cement Paste during Drying at 50°C

Aono

Matsushita

Shibata

et al. 2007

ACT

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“…The partial vapor pressures over the solid and liquid are given by Eq. [18]. If it is taken into account that in equilibrium the actual partial vapour p v does not depend on the particular phase we find…”

Section: Triple-phase Stability Below the Melting Pointmentioning

confidence: 98%

Mechanical Stability Criterion, Triple-Phase Condition, and Pressure Differences of Matter Condensed in a Porous Matrix

Setzer¹

2001

Journal of Colloid and Interface Science

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“…The term Πh is equivalent to the expression ΓΔm, which was introduced in [11] as a new thermodynamic function called excess surface work Φ. It is defined [12]: Excess surface work ESW = surface free energy + isothermal isobaric work of sorption.…”

Section: Theorymentioning

confidence: 99%

Thermodynamics and Modeling of Sorption Isotherms

Adolphs

2016

Chemie Ingenieur Technik

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An extended version of the thermodynamic computation model for sorption isotherms and capillary condensation is introduced. With the combination of the excess surface work (ESW) and disjoining pressure approach sorption isotherms for various pore size distributions of cylindrical and slit-like mesopores are successfully modeled. The main idea is that during adsorption on pore walls the approaching films will collapse and capillary condensation proceeds, while evaporation is described with a modified Kelvin equation. In both cases adsorption and desorption, the surface tension dependency on the pore size is considered.

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A Model to Describe Adsorption Isotherms

Cited by 70 publications

References 2 publications

Nano-structural Changes of C-S-H in Hardened Cement Paste during Drying at 50°C

Nano-structural Changes of C-S-H in Hardened Cement Paste during Drying at 50°C

Mechanical Stability Criterion, Triple-Phase Condition, and Pressure Differences of Matter Condensed in a Porous Matrix

Thermodynamics and Modeling of Sorption Isotherms

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