Comparison of Domain and Similarity Models for Characterizing Moisture Sorption Equilibria of Paper

Chatterjee, Siddharth G.

doi:10.1021/ie000437f

Cited by 13 publications

(12 citation statements)

References 5 publications

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“…Chatterjee [35,36] for bleached Kraft paperboard, C=56.0, K=0.75 and monolayer moisture content of 5.10%. The GAB parameter C is related to the magnitude of the enthalpy difference in the upper layers and in the monolayer, while the constant K is related to measurement of the difference of enthalpy in the sorbate's pure liquid state and in the upper layers (layers above the monolayer).…”

Section: Nfc Filmmentioning

confidence: 99%

Water vapor transport properties of regenerated cellulose and nanofibrillated cellulose films

Bedane

Eić

Farmahini-Farahani

et al. 2015

Journal of Membrane Science

159

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Section: Nfc Filmmentioning

confidence: 99%

Water vapor transport properties of regenerated cellulose and nanofibrillated cellulose films

Bedane

Eić

Farmahini-Farahani

et al. 2015

Journal of Membrane Science

159

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“…Under high humidity conditions, paper has been known to show lower elastic moduli, yield stresses, and tensile strengths (TSs; Bandyopadhyay and others 2002). Though the moisture content of paper materials affect the mechanical properties of paper‐based packaging materials, the moisture content is directly related to the humidity of external environment (Eagleton and Marcondes 1994; Marcondes 1996; Chatterjee 2001; Parker and others 2006). It is therefore important to understand how the moisture content varies under different environmental conditions such as environment's relative humidity (RH) and temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of Water Vapor Sorption Isotherms and Mechanical Properties of Selected Paper‐Based Food Packaging Materials

Rhim¹,

Lee²

2009

Journal of Food Science

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Adsorption isotherms of 3 selected paper-based packaging materials, that is, vegetable parchment (VP) paper, Kraft paper, and solid-bleached-sulfate (SBS) paperboard, were determined at 3 different temperatures (25, 40, and 50 degrees C). The GAB isotherm model was found to fit adequately for describing experimental adsorption isotherm data for the paper samples. The monolayer moisture content of the paper samples decreased with increase in temperature, which is in the range of 0.0345 to 0.0246, 0.0301 to 0.0238, and 0.0318 to 0.0243 g water/g solid for the MG paper, the Kraft paper, and the SBS paperboard, respectively. The net isosteric heats of sorption (q(st)) for the paper samples decreased exponentially with increase in moisture content after reaching the maximum values of 18.51, 27.39, and 26.80 kJ/mol for the VP paper, the Kraft paper, and the SBS paperboard, respectively, at low-moisture content. The differential enthalpy and entropy of 3 paper samples showed compensation phenomenon with the isokinetic temperature of 399.7 K indicating that water vapor had been adsorbed onto the paper samples with the same mechanism. Depending on the paper material, tensile strength of paper samples was affected by moisture content.

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“…Further research has shown that the problem is much more difficult, and that the summary curves suggested here are simplifications of the problem. The equilibrium moisture content in paper has been shown to form a hysteresis loop [113][114][115]. Detailed studies have been conducted to model heat and mass transport in paper [116,117].…”

Section: Air and Paper Moisture Equilibriumsmentioning

confidence: 99%

Dielectrometry Measurements of Moisture Diffusion and Temperature Dynamics in Oil Impregnated Paper Insulated Electric Power Cables

Thomas

Zahn

2008

Conference Record of the 2008 IEEE International Symposium on Electrical Insulation

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Paper insulated lead covered (PILC) cables have played an important role in underground power distribution for a hundred years. Replacing aged PILC before failure is critical to managing power distribution. Three prominent failure mechanisms accelerate cable aging: temperature stresses, moisture ingress, and partial discharge. The research focuses on the effect of temperature and moisture on the effective (complex) permittivity of the cable insulation. Measurements are performed using cylindrical dielectrometry sensors designed to be wrapped around the cable. The lead sheath of the cable is removed so that the sensors can be placed directly in contact with the insulation. From the measurements, the electrical properties of the material as a function of temperature and transient moisture diffusion are found.A theoretical treatment of the interdigital dielectrometry sensors with a cylindrical geometry is presented. Two classes of the geometry are studied. The φ periodic sensor geometry has electrodes aligned with the cylindrical axis and periodic around the circumference. The z periodic sensor geometry has the electrodes forming rings around the cylinder that are periodic along the cylindrical axis. The material is modeled by concentric rings of homogeneous materials. The electric field solution consists of an infinite summation of Fourier series terms. In finding the field solution and as a consequence of it, the potential, electric field lines, and the impedance between the driving and sensing electrodes are found. A generalized solution to the planar dielectrometry sensor topology is also presented. This solution allows for an arbitrary placement and excitation of electrodes, providing the analytical tools for a new generation of sensors.Dielectrometry sensors for use in φ and z periodic geometries are designed and manufactured on a 4 mil PTFE substrate. An experimental setup is designed and built to provide a temperature and humidity controlled environment for measurements. Special clamping mechanisms are used to secure the sensor to the sample. Custom built hardware is used to excite the sensor at frequencies ranging from 0.005 Hz to 10,000 Hz (over six decades), measure and record the response, and deliver it to a computer for storage and analysis.Steady state measurements are performed at temperatures ranging from room temperature to 100• C. Plastics, woods, and the PILC cable samples are measured. Using the theoretical model, the effective permittivity is estimated from the measurements. An Arrhenius temperature dependence is observed for several materials including the PILC cables. We characterize the temperature dependence of these materials by a master curve and activation energy. Together they give a complete description of the effective permittivity's frequency and temperature dependence.Transient measurements of moisture diffusion are made at constant temperatures for several 4 materials. For some experiments the boundary conditions limit the diffusion of moisture to one direction. When the z...

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Comparison of Domain and Similarity Models for Characterizing Moisture Sorption Equilibria of Paper

Cited by 13 publications

References 5 publications

Water vapor transport properties of regenerated cellulose and nanofibrillated cellulose films

Water vapor transport properties of regenerated cellulose and nanofibrillated cellulose films

Thermodynamic Analysis of Water Vapor Sorption Isotherms and Mechanical Properties of Selected Paper‐Based Food Packaging Materials

Dielectrometry Measurements of Moisture Diffusion and Temperature Dynamics in Oil Impregnated Paper Insulated Electric Power Cables

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