Adsorption on nonporous solids

Brunauer, Stephen; Skalny, Jan; Bodor, E.E

doi:10.1016/0021-9797(69)90423-8

Cited by 211 publications

(73 citation statements)

References 16 publications

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“…The results of nitrogen and water adsorption on R-Al 2 O 3 are shown in Figure 2. For nitrogen adsorption, the BrunauerEmmett-Teller (BET) 34,35 method is the most widely used procedure for the determination of the surface area of solid materials and involves the use of the BET equation…”

Section: Resultsmentioning

confidence: 99%

The Utilization of Physisorption Analyzer for Studying the Hygroscopic Properties of Atmospheric Relevant Particles

2010

J. Phys. Chem. A

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The hygroscopic behavior of atmospheric aerosols has a significant effect on the global climate change. In this study, a physisorption analyzer was used to measure the water adsorption capacity of Al 2 O 3 , NaCl, NH 4 NO 3 , and (NH 4 ) 2 SO 4 particles at 273.6 K. Qualitative and quantitative information about water adsorption on these particles was obtained with changing the temperature and/or relative humidity (RH). Uptake of water on Al 2 O 3 showed a type-II BET adsorption isotherm with the monolayer formed at ∼18% relative humidity (RH). The hygroscopic properties of NaCl, (NH 4 ) 2 SO 4 , and NH 4 NO 3 , including the deliquescence relative humidities (DRH), the temperature dependence of the DRH for NH 4 NO 3 , and the growth factors of NaCl and (NH 4 ) 2 SO 4 were determined. All these results were in good agreement with the results obtained by other methods and/or theoretical prediction with a deviation less than 2%. For NaCl, the water adsorption amount increase rate exhibits three stages (<30% RH, ∼30%-65% RH, and >65% RH) in the predeliquescence process and monolayer thin film water was formed at about 30% RH. It demonstrated that this instrument was practicable for studying the hygroscopic behavior of both soluble and insoluble but wettable atmospheric nonviolate aerosol particles.

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Section: Resultsmentioning

confidence: 99%

The Utilization of Physisorption Analyzer for Studying the Hygroscopic Properties of Atmospheric Relevant Particles

2010

J. Phys. Chem. A

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“…For a given temperature this relationship has been determined experimentally by adsorption isotherms. According to the Brunauer-Skalny-Bodor (BSB) model (Brunauer et al 1969) and the empirical expressions of Xi et al (1994), the adsorption isotherm depends on temperature, water/cement ratio, w/c, and the equivalent hydration (curing) period, t e . This work adopts the BSB model to represent the moisture capacity.…”

Section: Corrosion Initiation and Pit Nucleationmentioning

confidence: 99%

Reliability of Reinforced Concrete Structures Subjected to Corrosion-Fatigue and Climate Change

Bastidas‐Arteaga

2018

Int J Concr Struct Mater

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Durability of reinforced concrete (RC) structures is affected by certain environmental conditions and operational actions which can reduce their lifetime significantly. Among these actions, this paper proposes a stochastic model that accounts for the combined effects of chloride-induced corrosion, climate change and cyclic loading. Separately, corrosion leads to cross-section reduction, climate change produces changes in temperature and humidity and fatigue induces nucleation and propagation of cracks in the rebars. When considered together, pitting corrosion nucleates cracks while environmental factors affect the kinematics of chloride ingress and corrosion propagation. The proposed approach is illustrated with the reliability analysis of a bridge girder subjected to cyclic loading under various environmental conditions. The overall results indicate that climate change effect induces lifetime reductions ranging between 1.4 and 2.3% if fatigue load is neglected. Under cyclic loading, total lifetime reduction increases up to 7%.

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“…Moreover, it would be fair to point out that the inequalities (1) have been observed already by Brunauer himself in a paper of 1969 [15]. Brunauer et al discuss Anderson's [4] and de Boer's [5] ideas 1 The sorbate activity a 0 is taken equal to the (partial) relative vapour pressure of the sorbate, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…They analyse the effect of the new constant k upon the values of v mB and c B and conclude that with decreasing values of k (B/1) the inequalities (1) are observed (see Table 1 of Ref. [15]). But they only point out these consequences in a qualitative way and do not fix or evaluate definitive values of k for the experimental cases they consider.…”

Section: Introductionmentioning

confidence: 99%

Multilayer sorption parameters: BET or GAB values?

Timmermann

2003

Colloids and Surfaces A: Physicochemical and Engineering Aspect

304

198

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The differences between the sets of values for the monolayer capacity and the energy constant obtained by sorption data regressions using two related multilayer sorption isotherms, the two-parameter BET (Brunauer Á/Emmett Á/Teller) and the three-parameter GAB (Guggenheim Á/Andersen Á/de Boer) isotherms, are analysed. Experimentally, it is found that the GAB monolayer value is always higher than the BET value and the GAB energy constant results always lower than the BET constant. Mathematical and physical reasons are given which explain these differences. The third GAB parameter determines the greater versatility of the GAB equation, which has a quite larger range of applicability than the BET isotherm. It is shown that in terms of the three GAB constants, the two BET parameters are qualitatively and quantitatively reproduced as well as their dependence on the regression interval used in the BET regression, justifying in this way the above-mentioned inequalities. The typical upswing in the BET plots after a (pseudo) linear range at lower activities of the sorbate is also explained. All these findings are exemplified using experimental sorption data of several systems of very distinct chemical nature. A complete regression procedure for sorption data in terms of the GAB isotherm is advanced. #

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Adsorption on nonporous solids

Cited by 211 publications

References 16 publications

The Utilization of Physisorption Analyzer for Studying the Hygroscopic Properties of Atmospheric Relevant Particles

The Utilization of Physisorption Analyzer for Studying the Hygroscopic Properties of Atmospheric Relevant Particles

Reliability of Reinforced Concrete Structures Subjected to Corrosion-Fatigue and Climate Change

Multilayer sorption parameters: BET or GAB values?

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