Moisture sorption behavior and thermodynamic properties of dry‐crystallized Palada payasam (rice flakes milk pudding) mix determined using the dynamic vapor sorption method

2020 ◽  
Vol 44 (10) ◽  
Author(s):  
Gajanan Panditrao Deshmukh ◽  
Menon R. Ravindra ◽  
Naveen Jose ◽  
Prashant G. Wasnik ◽  
Ananta V. Dhotre
Keyword(s):  
Thermodynamic Properties ◽  
Moisture Sorption ◽  
Sorption Behavior ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Sorption Method

Moisture Sorption Behavior and Thermodynamic Properties of Gulabjamun Mix

2013 ◽  
Vol 38 (6) ◽  
pp. 2192-2200 ◽  
Author(s):  
Heartwin A. Pushpadass ◽  
F. Magdaline Eljeeva Emerald ◽  
Bharat Chaturvedi ◽  
K. Jayaraj Rao
Keyword(s):  
Thermodynamic Properties ◽  
Moisture Sorption ◽  
Sorption Behavior

Effects of acetylation and formalization on the dynamic water vapor sorption behavior of wood

Holzforschung ◽  
2015 ◽  
Vol 69 (5) ◽  
pp. 633-643 ◽  
Author(s):  
Sarah Himmel ◽  
Carsten Mai
Keyword(s):  
Cell Wall ◽  
Water Vapor ◽  
Relative Humidity ◽  
Water Vapor Sorption ◽  
Cross Linking ◽  
Sorption Behavior ◽  
Matrix Stiffness ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Cell Wall Polymers

Abstract The dynamic water vapor sorption of untreated, acetylated (Wac), and formaldehyde-treated (WFA) Scots pine (Pinus sylvestris L.) sapwood was studied in a dynamic vapor sorption apparatus to assess the effects of cell wall bulking and cross-linking. Both modifications resulted in a considerable reduction of reduced equilibrium moisture content (EMCR), the corresponding equilibrium times, and hysteresis in the hydroscopic range of wood. Acetylation reduced the adsorption and desorption of water at each given relative humidity (RH) step from 0% to 95% RH, whereas formalization affected the sorption behavior of wood solely above 20% RH. From 20% to 95% RH, the EMC ratio of WFA to its control steadily decreased, whereas the EMC ratio of Wac was still constant in this RH range. Below 20% RH, the sorption behavior of Wac was governed by hydroxyl blocking, whereas that of WFA was hardly influenced compared with the control. Above 20% RH, the sorption behavior of Wac was solely determined by cell wall bulking, whereas that of WFA was governed by the increased matrix stiffness due to the cross-linking of cell wall polymers.

scholarly journals Water vapor sorption behavior of bamboo pertaining to its hierarchical structure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Qi Chen ◽  
Changhua Fang ◽  
Ge Wang ◽  
Xinxin Ma ◽  
Junji Luo ◽  
...  
Keyword(s):  
Cell Wall ◽  
Water Vapor ◽  
Moisture Content ◽  
Moisture Transport ◽  
Water Vapor Sorption ◽  
Sorption Behavior ◽  
Sorption Rate ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Macro Scale

AbstractBamboo is an anisotropic, hierarchical, and hygroscopic material. Moisture transport in bamboo is one of the most fundamental properties affecting almost all other physical and mechanical properties of the material. This study investigated the water vapor sorption behaviors of bamboo at various structural levels: cell walls, cells (with pits) and bamboo blocks. The specimens with two sorption directions, longitudinal (L) and transverse (T), were measured by saturated salt solution method and dynamic vapor sorption. The parallel exponential kinetics model was used to analyze the sorption kinetics. The results showed that at the cell wall level, the sorption rate and equilibrium moisture content (EMC) of cell wall in the L specimens were larger than those in the T specimens. The differences were probably caused by the looser cell wall layers in the L specimens. At the cellular scale, pits in the cell wall resulted in an enhanced sorption rate and EMC of the T specimens compared with the L specimens where the pits in the parenchyma cells were only distributed in the lateral walls but not in end walls. At the macro scale, the sorption rate and moisture content of bamboo blocks were largely controlled by the vessel cells. As a hierarchically-structured plant, bamboo performs the biological function of moisture transport at all these scales. This work helps improve the understanding of water transport behavior in bamboo, which may lead to better bamboo drying and impregnation processes.

scholarly journals Predicting 3D moisture sorption behavior of materials from 1D investigations

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hom N. Sharma ◽  
Yunwei Sun ◽  
Elizabeth A. Glascoe
Keyword(s):  
Molecular Diffusion ◽  
Chemical Properties ◽  
Moisture Sorption ◽  
Sorption Behavior ◽  
Dynamic Vapor Sorption ◽  
Sorption Model ◽  
Size And Shape ◽  
Wide Range ◽  
And Diffusion ◽  
Triple Mode

Abstract Moisture in materials can be a source of future outgassing and exacerbate unwanted changes in physical and chemical properties. Here, we investigate the effect of sample size and shape on the moisture transport phenomena through a combined experimental and modeling approach. Several different materials varying in size and shape were investigated over a wide range of relative humidities (0–90%) and temperatures ($$30{-}70^{\,\circ } \hbox {C}$$ 30 - 70 ∘ C ) using gravimetric type dynamic vapor sorption (DVS). A dynamic triple-mode sorption model, developed previously, was employed to describe the experimental results with good success; the model includes absorption, adsorption, pooling (clustering) of species, and molecular diffusion. Here we show that the full triple-mode sorption model is robust enough to predict the dynamic uptake and outgassing of 3-dimensional (3D) samples using parameters derived from quasi-1D samples. This successful demonstration on three different materials (filled polydimethylsiloxane (PDMS), unfilled PDMS, and ceramic inorganic composite) illustrates that the model is robust at describing the scale-independent physics and chemistry of moisture sorption and diffusion materials. This work demonstrates that while sorption mechanisms manifest in testing of all sample sizes, some of these mechanisms were so subtle that they were overlooked in our initial modeling and assessment, illustrating the importance of multi-scale experiments in the development of robust predictive capabilities. Our study also outlines the challenges and viable solutions for global optimization of a multi-parameter model. The ability to quantify moisture sorption and diffusion, independent of scale, using 1D lab-scale experiments enables prediction of long-term bulk materials behavior in real applications.

scholarly journals Characterization of Archaeological European White Elm (Ulmus laevis P.) and Black Poplar (Populus nigra L.)

Forests ◽  
2020 ◽  
Vol 11 (12) ◽  
pp. 1329
Author(s):  
Amir Ghavidel ◽  
Reza Hosseinpourpia ◽  
Holger Militz ◽  
Viorica Vasilache ◽  
Ion Sandu
Keyword(s):  
Photoelectron Spectroscopy ◽  
Amorphous Structure ◽  
Sorption Behavior ◽  
Vapor Sorption ◽  
X Ray Diffraction ◽  
Dynamic Vapor Sorption ◽  
X Ray ◽  
Archaeological Wood ◽  
Extensive Degradation

The present study aims at characterization of freshly-cut and archaeological European white elm and poplar. The archaeological elm sample was buried at a depth of 8–10 m inside of soil with age approximation of ~1800–2000 years old, and the archaeological poplar sample was a part of a boat in a freshwater lake or river with age estimation of ~1000–1200 years. Alteration in the chemical structure of the elm and poplar samples due to the ageing process were confirmed by X-ray photoelectron spectroscopy (XPS). Both archaeological wood (AW) samples illustrated considerably lower cellulose crystallinity than the fresh samples as determined by X-ray diffraction. The sorption behavior of AW and fresh wood (FW) samples were evaluated by means of dynamic vapor sorption (DVS) analysis. Results exhibited a higher equilibrium moisture content (EMC) and sorption hysteresis values in archaeological elm and poplar as compared with the fresh samples. Higher hydrophilicity of the AW samples than the FW ones is attributed to their higher amorphous structure. The extensive degradation of AW samples were also confirmed by scanning electron microscopy (SEM) micrographs.

scholarly journals Sorption behavior of four tropical woods using a dynamic vapor sorption standard analysis system

2016 ◽  
pp. 0-0 ◽  
Author(s):  
Merlin Simo-Tagne ◽  
Romain Rémond ◽  
Yann Rogaume ◽  
André Zoulalian ◽  
Béguidé Bonoma
Keyword(s):  
Sorption Behavior ◽  
Vapor Sorption ◽  
Dynamic Vapor Sorption ◽  
Standard Analysis ◽  
Analysis System ◽  
Tropical Woods
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