Sorption of Water, Ammonia, Ethyl Chloride, and Methane on Na—X Zeolite and Associated Framework Distortion

1974 ◽  
Vol 52 (22) ◽  
pp. 3699-3706 ◽  
Author(s):  
D. L. Rimmer ◽  
R. McIntosh
Keyword(s):  
Water Sorption ◽  
Room Temperature ◽  
Sorption Isotherms ◽  
Length Change ◽  
Sorption Process ◽  
Ethyl Chloride ◽  
Two Dimensional ◽  
X Zeolite ◽  
Methane Sorption ◽  
Multilayer Formation

Length change and sorption isotherms have been determined for water, ammonia, ethyl chloride, and methane on compacted samples of zeolite NaX. Methane sorption at 0 °C and ethyl chloride sorption at −10°C were accompanied by little or no framework distortion as monitored by length change measurements; sorption of ammonia in the temperature range −50 to −70 °C produced more appreciable distortion; and water sorption at room temperature caused large changes. In each case the framework distortion was correlated with different stages in the sorption process. The sorption isotherms for the ammonia/NaX system indicated the possibility at high uptakes of two-dimensional condensation or multilayer formation. The critical temperature for two-dimensional condensation would be −70 °C.

scholarly journals Drying and rehydration of oyster mushroom

2010 ◽  
Vol 53 (4) ◽  
pp. 945-952 ◽  
Author(s):  
Giannini Pasiznick Apati ◽  
Sandra Aparecida Furlan ◽  
João Borges Laurindo
Keyword(s):  
Experimental Data ◽  
Relative Humidity ◽  
Pleurotus Ostreatus ◽  
Water Sorption ◽  
Room Temperature ◽  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Fruiting Bodies ◽  
Different Temperatures ◽  
Water Sorption Isotherms

Dehydration and rehydration processes of Pleurotus ostreatus fruiting bodies were investigated in this work. Mushroom samples were dehydrated at 40, 50 and 60 ºC, using drying air with relative humidity of 75 %. The rehydration was investigated at different temperatures of immersion water (25, 55 and 85 ºC) and different immersion times (30, 75 and 120 minutes). The best rehydration occurred for the samples dried at 40 ºC. The rehydration could be done in water at room temperature, during 30 minutes. Water sorption isotherms of samples were determined at 30, 40 and 50 ºC. Both GAB and BET models satisfactorily represented the experimental data of moisture sorption of dried mushrooms.

Thermodynamic Analysis of Water Vapour Sorption of Edible Starch Based Films

2003 ◽  
Vol 9 (2) ◽  
pp. 115-121 ◽  
Author(s):  
M. A. Bertuzzi ◽  
M. Armada ◽  
J. C. Gottifredi
Keyword(s):  
Water Sorption ◽  
Corn Starch ◽  
Gravimetric Method ◽  
Sorption Isotherms ◽  
Moisture Sorption ◽  
Sorption Process ◽  
Water Vapour Sorption ◽  
Bet Model ◽  
Moisture Sorption Isotherms ◽  
High Amylose

Moisture sorption isotherms of high amylose corn starch (HACS) films at 5, 25, 35 and 45 °C within an approximate water activity ( aw) range of 0.11-0.85 were obtained using a static gravimetric method. HACS films fitted a type III BET model at all temperatures studied. Water sorption process in high amylose based films was exothermic within the range of water activities investigated. There was a continuous decrease of the affinity between film sorbed structure with moisture as water content increased. Negative values of Δ G in the whole range of moisture content studied were indicative of a spontaneous process. The entropy curve exhibited a well-defined minimum corresponding at the completion of the monolayer.

Effect of Water Sorption on Carbonate Rock Expansivity

1975 ◽  
Vol 12 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Peter P. Hudec ◽  
Nicholas Sitar
Keyword(s):  
Thermal Expansion ◽  
Water Sorption ◽  
Carbonate Rock ◽  
Room Temperature ◽  
Length Change ◽  
Thermal Coefficient ◽  
Saturated Rock ◽  
Thermal Expansion Coefficients ◽  
Isothermal Expansion ◽  
Expansion Coefficients

Length change experiments on carbonate rock samples indicate that the thermal coefficient of expansion (contraction) from normal room temperature to below freezing is a function of the sorptive characteristic of the rock. The highly adsorptive rocks, i.e. those adsorbing more than 40% of their water from near 100% humidity atmosphere, show an increased thermal contraction coefficient in the saturated state over their dry state. The low adsorptive rocks have the same thermal expansion coefficients either in a dry or saturated state.The highly adsorptive rocks expand isothermally upon saturation. The average isothermal expansion of a group of nine rocks was equivalent to the dry thermal expansion of a 78 °C temperature change. The low adsorptive rocks showed a small net isothermal contraction upon wetting.The results indicate that the thermal coefficients of expansion obtained below the 100 °C range must specify the saturation conditions of the rock, and may differ for dry and saturated rock. A mechanism of weathering of highly adsorptive rocks is suggested, based on isothermal expansion and contraction of these rocks in dry and saturated states respectively. If confined, as in concrete, such rocks may generate destructive expansive forces upon wetting.

The Influences of the Rank of Coal on Methane Sorption Capacity in Coals/Wpływ Rzędu Węgla Na Pojemność Sorpcyjną Metanu W Węglach

2014 ◽  
Vol 59 (2) ◽  
pp. 509-516
Author(s):  
Andrzej Olajossy
Keyword(s):  
Sorption Capacity ◽  
Coalbed Methane ◽  
Vitrinite Reflectance ◽  
Sorption Isotherms ◽  
Volatile Matter ◽  
Low Rank ◽  
Hard Coal ◽  
Petrographic Composition ◽  
Methane Sorption ◽  
Indian Coals

Abstract Methane sorption capacity is of significance in the issues of coalbed methane (CBM) and depends on various parameters, including mainly, on rank of coal and the maceral content in coals. However, in some of the World coals basins the influences of those parameters on methane sorption capacity is various and sometimes complicated. Usually the rank of coal is expressed by its vitrinite reflectance Ro. Moreover, in coals for which there is a high correlation between vitrinite reflectance and volatile matter Vdaf the rank of coal may also be represented by Vdaf. The influence of the rank of coal on methane sorption capacity for Polish coals is not well understood, hence the examination in the presented paper was undertaken. For the purpose of analysis there were chosen fourteen samples of hard coal originating from the Upper Silesian Basin and Lower Silesian Basin. The scope of the sorption capacity is: 15-42 cm3/g and the scope of vitrinite reflectance: 0,6-2,2%. Majority of those coals were of low rank, high volatile matter (HV), some were of middle rank, middle volatile matter (MV) and among them there was a small number of high rank, low volatile matter (LV) coals. The analysis was conducted on the basis of available from the literature results of research of petrographic composition and methane sorption isotherms. Some of those samples were in the form (shape) of grains and others - as cut out plates of coal. The high pressure isotherms previously obtained in the cited studies were analyzed here for the purpose of establishing their sorption capacity on the basis of Langmuire equation. As a result of this paper, it turned out that for low rank, HV coals the Langmuire volume VL slightly decreases with the increase of rank, reaching its minimum for the middle rank (MV) coal and then increases with the rise of the rank (LV). From the graphic illustrations presented with respect to this relation follows the similarity to the Indian coals and partially to the Australian coals.

scholarly journals Polymorphic gallium for active resonance tuning in photonic nanostructures: from bulk gallium to two-dimensional (2D) gallenene

Nanophotonics ◽  
2020 ◽  
Vol 9 (14) ◽  
pp. 4233-4252
Author(s):  
Yael Gutiérrez ◽  
Pablo García-Fernández ◽  
Javier Junquera ◽  
April S. Brown ◽  
Fernando Moreno ◽  
...  
Keyword(s):  
Optical Properties ◽  
Room Temperature ◽  
Phase Change Materials ◽  
Two Dimensional ◽  
Active Materials ◽  
Promising Candidate ◽  
Plasmonic Structures ◽  
Resonance Tuning ◽  
The Many ◽  
Optical Behavior

AbstractReconfigurable plasmonics is driving an extensive quest for active materials that can support a controllable modulation of their optical properties for dynamically tunable plasmonic structures. Here, polymorphic gallium (Ga) is demonstrated to be a very promising candidate for adaptive plasmonics and reconfigurable photonics applications. The Ga sp-metal is widely known as a liquid metal at room temperature. In addition to the many other compelling attributes of nanostructured Ga, including minimal oxidation and biocompatibility, its six phases have varying degrees of metallic character, providing a wide gamut of electrical conductivity and optical behavior tunability. Here, the dielectric function of the several Ga phases is introduced and correlated with their respective electronic structures. The key conditions for optimal optical modulation and switching for each Ga phase are evaluated. Additionally, we provide a comparison of Ga with other more common phase-change materials, showing better performance of Ga at optical frequencies. Furthermore, we first report, to the best of our knowledge, the optical properties of liquid Ga in the terahertz (THz) range showing its broad plasmonic tunability from ultraviolet to visible-infrared and down to the THz regime. Finally, we provide both computational and experimental evidence of extension of Ga polymorphism to bidimensional two-dimensional (2D) gallenene, paving the way to new bidimensional reconfigurable plasmonic platforms.

Magnetic and phonon transport properties of two-dimensional room-temperature ferromagnet VSe2

2021 ◽  
Author(s):  
Haohao Sheng ◽  
Haoxiang Long ◽  
Guanzhen Zou ◽  
Dongmei Bai ◽  
Junting Zhang ◽  
...  
Keyword(s):  
Transport Properties ◽  
Room Temperature ◽  
Phonon Transport ◽  
Two Dimensional

Two-Dimensional Room-Temperature Giant Antiferrodistortive SrTiO3 at a Grain Boundary

2021 ◽  
Vol 126 (22) ◽  
Author(s):  
Bo Han ◽  
Ruixue Zhu ◽  
Xiaomei Li ◽  
Mei Wu ◽  
Ryo Ishikawa ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Two Dimensional

scholarly journals HfS2 thin films deposited at room temperature by an emerging technique, solution atomic layer deposition

2021 ◽  
Author(s):  
Yuanyuan Cao ◽  
Sha Zhu ◽  
Julien Bachmann
Keyword(s):  
Thin Films ◽  
Atomic Layer Deposition ◽  
Room Temperature ◽  
Atomic Layer ◽  
Two Dimensional ◽  
Molecular Precursors ◽  
Layer Deposition

The two-dimensional material and semiconducting dichalcogenide hafnium disulfide is deposited at room temperature by atomic layer deposition from molecular precursors dissolved in hexane.

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