Oscillatory Water Sorption Test for Determining Water Uptake Behavior in Bread Crust

2007 ◽  
Vol 55 (7) ◽  
pp. 2611-2618 ◽  
Author(s):  
Neleke H. van Nieuwenhuijzen ◽  
R. Hans Tromp ◽  
Rob J. Hamer ◽  
Ton van Vliet
Keyword(s):  
Water Uptake ◽  
Water Sorption ◽  
Bread Crust

Tunable LiCl@UiO-66 composites for water sorption-based heat transformation applications

2020 ◽  
Vol 8 (26) ◽  
pp. 13364-13375 ◽  
Author(s):  
Yangyang Sun ◽  
Alex Spieß ◽  
Christian Jansen ◽  
Alexander Nuhnen ◽  
Serkan Gökpinar ◽  
...  
Keyword(s):  
Water Uptake ◽  
Water Sorption ◽  
Coefficient Of Performance ◽  
Cycle Stability ◽  
High Coefficient ◽  
Low Humidity ◽  
Heat Transformation

No deliquescence, cycle stability, increased water uptake over a neat MOF and LiCl at low humidity, and high coefficient of performance.

scholarly journals New Composite Water Sorbents CaCl2-PHTS for Low-Temperature Sorption Heat Storage: Determination of Structural Properties

Nanomaterials ◽  
2018 ◽  
Vol 9 (1) ◽  
pp. 27 ◽  
Author(s):  
Alenka Ristić ◽  
Nataša Zabukovec Logar
Keyword(s):  
Electron Microscopy ◽  
Calcium Chloride ◽  
Structural Properties ◽  
Sorption Capacity ◽  
Water Uptake ◽  
Water Sorption ◽  
Heat Storage ◽  
Impregnation Method ◽  
Sorption Heat ◽  
Water Sorption Capacity

Sorption heat storage, as one of low-energy consuming technologies, is an approach to reduce CO2 emissions. The efficiency of such technology is governed by the performance of the applied sorbents. Thus, sorbents with high water sorption capacity and regeneration temperature from 80 to 150 °C are required. Incorporation of hygroscopic salt such as calcium chloride into porous materials is a logical strategy for increasing the water sorption capacity. This work reports the study on the development of composites with PHTS (plugged hexagonal templated silicate) matrix with an average pore size of 5.7 nm and different amounts of calcium chloride (4, 10, 20 wt.%) for solar thermal energy storage. These composites were prepared by wetness incipient impregnation method. Structural properties were determined by X-ray diffraction (XRD), nitrogen physisorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). CaCl2 was confined in micro- and mesopores of the matrix. The resulting CaCl2-PHTS materials were used for water sorption at 40 °C, showing an increase of maximal water uptake with higher amount of calcium chloride from 0.78 g/g to 2.44 g/g of the dry composite. A small reduction in water uptake was observed after 20 cycles of sorption/desorption between temperatures of 140 °C and 40 °C, indicating good cycling stability of these composites under the working conditions.

scholarly journals Water Sorption and Transport in Dry, Crispy Bread Crust

2010 ◽  
pp. 165-174
Author(s):  
M. B. J. Meinders ◽  
N. H. van Nieuwenhuijzen ◽  
R. H. Tromp ◽  
R. J. Hamer ◽  
T. van Vliet
Keyword(s):  
Water Sorption ◽  
Bread Crust

Oscillatory water sorption dynamics of bread crust

2011 ◽  
Vol 44 (9) ◽  
pp. 2814-2821 ◽  
Author(s):  
Marcel B.J. Meinders ◽  
Ton van Vliet
Keyword(s):  
Water Sorption ◽  
Sorption Dynamics ◽  
Bread Crust

Water Uptake Mechanism in Crispy Bread Crust

2008 ◽  
Vol 56 (15) ◽  
pp. 6439-6446 ◽  
Author(s):  
Neleke H. van Nieuwenhuijzen ◽  
Marcel B. J. Meinders ◽  
R. Hans Tromp ◽  
Rob J. Hamer ◽  
Ton van Vliet
Keyword(s):  
Water Uptake ◽  
Uptake Mechanism ◽  
Bread Crust

Water sorption in thin films of high-temperature polyimides: the effect of imidization history

1994 ◽  
Vol 6 (4) ◽  
pp. 321-333 ◽  
Author(s):  
M Ree ◽  
H Han ◽  
C C Gryte
Keyword(s):  
Diffusion Coefficient ◽  
High Temperature ◽  
Water Uptake ◽  
Water Sorption ◽  
Amic Acid ◽  
Morphological Heterogeneity ◽  
Thermal Imidization ◽  
Ordered Phases ◽  
Decreasing Functions ◽  
Acid Precursor

PMDA-ODA and BPDA-PDA polyimides in 10-50 Atrn thick films were prepared from the respective poly(amic acid) precursor by thermal imidization for 1-10 h at various temperatures over 230-400C. Their water sorption behaviours were studied in detail by gravimetry. Water sorption in both PMDA-ODA and BPDA-PDA followed a nearly Fickian process in spite of the morphological heterogeneity due to the ordered and less ordered phases. Water clustering or plasticization was very weakly evident on the water uptake versus humidity plots. Water sorption in both polyimides was highly dependent upon imidization history. Both diffusion coefficient and water uptake are decreasing functions of imidization temperature and time. This resulted mainly from the enhancement of overall crystallinity by high-temperature imidization because of their high-rT nature. The diffusion coefficient and water uptake were (1.0-3.0) x 10-9 cm2 s-1 and 0.4-4.5 wt% for PMDA-ODA and (0.9-3.0)x 10-cm2s-' and 0. I2-2.40wt%, depending on humidity,/iihidization history and film thickness. The differences between the water sorptions of the p'olyimides are interpreted by considering the differences in their morphologies and chemical affinities to water.

Study on water uptake of proton exchange membrane by using tritiated water sorption method

2005 ◽  
Vol 30 (9) ◽  
pp. 1017-1025 ◽  
Author(s):  
H TAKATA ◽  
M NISHIKAWA ◽  
Y ARIMURA ◽  
T EGAWA ◽  
S FUKADA ◽  
...  
Keyword(s):  
Water Uptake ◽  
Water Sorption ◽  
Proton Exchange Membrane ◽  
Tritiated Water ◽  
Proton Exchange ◽  
Sorption Method ◽  
Exchange Membrane

scholarly journals Effect of Mobile Carrier on the Performance of PVAm–Nanocellulose Facilitated Transport Membranes for CO2 Capture

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 442
Author(s):  
Riccardo Casadei ◽  
Elham Firouznia ◽  
Marco Giacinti Baschetti
Keyword(s):  
Relative Humidity ◽  
Water Uptake ◽  
Co2 Capture ◽  
Water Sorption ◽  
Facilitated Transport ◽  
Gas Permeation ◽  
High Relative Humidity ◽  
Co2 Transport ◽  
Mobile Carrier

Facilitated transport membranes obtained by coupling polyvinylamine with highly charged carboxymethylated nanocellulose fibers were studied considering both water sorption and gas permeation experiments. In particular, the effect of the L-arginine as a mobile carrier was investigated to understand possible improvements in CO2 transport across the membranes. The results show that L-arginine addition decreases the water uptake of the membrane, due to the lower polyvinylamine content, but was able to improve the CO2 transport. Tests carried on at 35 °C and high relative humidity indeed showed an increase of both CO2 permeability and selectivity with respect to nitrogen and methane. In particular, the CO2 permeability increased from 160 to about 340 Barrer when arginine loading was increased from 0 to 45 wt%. In the same conditions, selectivity with respect to nitrogen was more than doubled, increasing from 20 to 45. Minor improvements were instead obtained with respect to methane; CO2/CH4 selectivity, indeed, even in presence of the mobile carrier, was limited to about 20.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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