A Multilayer Theory for Gas Sorption

Dent, R. W.

doi:10.1177/004051757704700213

Cited by 136 publications

(39 citation statements)

References 16 publications

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“…2), which is usually well fitted by the Dent [7,8] and/or the BET [15] model. Both models distinguish two types of water binding sites on the surfaces of the system investigated, namely, (i) "primary" water binding sites (directly to the adsorbent surface); and (ii) "secondary', usually weaker, water binding sites (to the primary bound water molecules, to the previous water layers, or to the low affinity surface binding sites).…”

Section: Resultsmentioning

confidence: 99%

“…Photosynthetic membranes were isolated at early stages of greening (24 h of light after 6 days in darkness), or from fully developed chloroplasts [6]. For all samples the hydration kinetics was well fitted by the single exponential function, whereas the sorption isotherm revealed the sigmoidal form [7,8], with decreased contribution of high affinity water binding sites as compared to that for lichen thalli [9,10]. The hydration isotherm observed by proton FIDs shows the presence of water "sealed" in the structure of lyophilizate, which is not removed by the freeze-drying procedure.…”

Section: Introductionmentioning

confidence: 99%

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Maturation Process of Photosynthetic Membranes Observed by Proton Magnetic Relaxation and Sorption Isotherm

et al. 2009

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Mild rehydration from the gaseous phase of the developing and mature lyophilized wheat photosynthetic membranes was investigated using hydration kinetics, adsorption isotherm and high power proton relaxometry. Hydration time courses are single exponential for all target air humidities; the hydration time t h equals to (11.9 ± 3.6) h for the mature membranes, and (17.0 ± 3.2) h for the developing membranes. The sorption isotherm is sigmoidal in form and well fitted using the Dent model; the mass of water saturating primary binding sites equals ∆M/m 0 = 0.033 ± 0.013 and 0.025 ± 0.007 for the mature and for the developing membranes, respectively, where m 0 is the dry mass of the sample, and ∆M is mass of water taken up. Proton free induction decays distinguish: (i) an immobilized proton (Gaussian) component, S 0 , originating from protons of solid matrix of lyophilizate; (ii) a Gaussian component, S 1 , from water bound to the primary water binding sites and localized in proximity of paramagnetic ions; (iii) an exponentially decaying contribution, L 1 , from water tightly bound to lyophilizate surface; and (iv) exponentially decaying loosely bound water pool, L 2 . A significant contribution of water "sealed" in the structure of lyophilized membrane (from the fraction S 1 and L 1 ) is detected. The mass of "sealed" water fraction is ∆M S /m 0 = 0.047 ± 0.023 and 0.072 ± 0.021 for the mature and for the developing membranes, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Maturation Process of Photosynthetic Membranes Observed by Proton Magnetic Relaxation and Sorption Isotherm

et al. 2009

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“…2), which usually is fitted by the Dent [9,10] and/or the BET [11] model. Both models distinguish two types of water binding sites on the surfaces of the system investigated, namely: (i) "primary" water binding sites (directly to the adsorbent surface); and (ii) "secondary", usually weaker, water binding sites (to the surface binding sites with small affinity, to the primary bound water molecules, or to the previous water layers).…”

Section: Resultsmentioning

confidence: 99%

Rehydration of Digalactosyldiacylglycerol Model Membrane Lyophilizates Observed by NMR and Sorption Isotherm

et al. 2009

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The initial stages of rehydration of digalactosyldiacylglycerol model membrane lyophilizates were observed using hydration kinetics, sorption isotherm, and high power proton relaxometry (at 30 MHz). Hydration time courses are single exponential and the sorption isotherm is sigmoidal in form. The mass of water saturating primary binding sites equals ∆M/m0 = 0.019 ± 0.001. Proton free induction decays distinguish (i) immobilized protons of solid matrix of lyophilizate, signal S0; (ii) protons of water fraction tightly bound to the lyophilizate surface, L1; and (iii) mobile protons of loosely bound water pool, L2. Hydration dependence of total water signal (L1 + L2)/S0 shows the presence of water fraction "sealed" in liposome structures, which equals ∆MS/m0 = 0.092 ± 0.007.

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“…For salmon sperm DNA lyophilizates the sorption isotherm is sigmoidal in form (Fig. 2), which usually is fitted by Dent [7,8] and/or by BET [9] model. Both models distinguish two types of water binding sites, namely, (i) "primary" water binding sites (directly to the adsorbent surfaces); and (ii) "secondary", usually weaker, water binding sites (to the surfaces binding sites with small affinity, to the primary bound water molecules, or to the previous water layers).…”

Section: Sorption Isothermmentioning

confidence: 99%