The effect of humidity and temperature on the equilibrium moisture content of powders

Shotton, E; Harb, N

doi:10.1111/j.2042-7158.1965.tb07712.x

Cited by 26 publications

(5 citation statements)

References 8 publications

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“…However, prolonged exposure times may be involved if the beds are excessively thick. For potato starch the equilibrium moisture content obtained at 85% relative humidity agrees with the results obtained by Shotton & Harb (1965) strengths obtained by Shotton & Harb (1966) at similar equilibrium moisture contents are lower than the values obtained in this work. This is probably due to the use of a different packing density (not specified by Shotton & Harb, 1966) since their method of bed preparation involves dredging with no consolidation.…”

Section: Discussionsupporting

confidence: 89%

Moisture uptake and tensile strength of bulk solids

Eaves

Jones

1970

Journal of Pharmacy and Pharmacology

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An apparatus is described in which bulk solid handling properties can be examined over a wide range of humidities. It is shown that constant temperature and relative humidity can be maintained. The apparatus can also be used to study the effect of cycles of humidity changes. The rate of moisture uptake by loosely packed and tapped beds of six pharmaceutical materials was found to be dependent upon bed depth but independent of bulk density. The tensile strengths of the bulk solids changed when they were subjected to high relative humidities.

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Section: Discussionsupporting

confidence: 89%

Moisture uptake and tensile strength of bulk solids

Eaves

Jones

1970

Journal of Pharmacy and Pharmacology

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“…The discrepancy can be attributed not only to the length of the simulations, but also the lack of crystal amylopectin and other material present in native starch samples. The temperature dependent moisture uptake trend is in line with experimental observations made for different starch samples (Shotton and Harb 1965) .…”

Section: Moisture Uptake In Amorphous Amylosesupporting

confidence: 89%

Characterizing Moisture Uptake and Plasticization Effects of Water on Amorphous Amylose Starch Models Using Molecular Dynamics Methods

Sanders

Misra²,

Mustard³

et al. 2020

Preprint

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<p>Dynamics and thermophysical properties of amorphous starch were explored using molecular dynamics (MD) simulations. Using the OPLS3e force field, simulations of short amylose chains in water were performed to determine force field accuracy. Using well-tempered metadynamics, a free energy map of the two glycosidic angles of an amylose molecule was constructed and compared with other modern force fields. Good agreement of torsional sampling for both solvated and amorphous amylose starch models was observed. Using combined grand canonical Monte Carlo (GCMC)/MD simulations, a moisture sorption isotherm curve is predicted along with temperature dependence. Concentration-dependent activation energies for water transport agree quantitatively with previous experiments. Finally, the plasticization effect of moisture content on amorphous starch was investigated. Predicted glass transition temperature (Tg) depression as a function of moisture content is in line with experimental trends. Further, our calculations provide a value for the dry Tg for amorphous starch, a value which no experimental value is available.</p><div><br></div>

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“…In addition, using the adsorption isotherms at various temperatures, the isosteric heat of adsorption can be determined. e isosteric heat of adsorption, also called enthalpy of adsorption (ΔH ads ), indicates the strength of the interaction (bond) between the adsorbate (water molecules) and the solid adsorbent [71,72]. is parameter represents the energy necessary for the heat of vaporization of moisture in a material during the adsorption process to exceed the latent heat of vaporization of pure water at a certain temperature [73].…”

Section: Water Sorption Analysismentioning

confidence: 99%

Adsorption Capacities of Hygroscopic Materials Based on NaCl-TiO₂ and NaCl-SiO₂ Core/Shell Particles

Bermeo

Hadri

Ravaux

et al. 2020

Journal of Nanotechnology

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Hygroscopic materials which possess high moisture adsorption capacity were successfully upgraded by the functionalization of sodium chloride (NaCl) using two nuances of oxides. A procedure was developed to first prepare submicron-sized NaCl crystals; thereafter, these crystals were coated by choice of either titanium dioxide (TiO2) or silica (SiO2) to enhance the hygroscopic properties of NaCl and prevent its premature deliquescence. After coating, several analytical techniques were employed to evaluate the obtained composite materials. Our findings revealed that both composites NaCl-TiO2 and NaCl-SiO2 gave excellent performances by exhibiting interesting hydrophilic properties, compared to the sole NaCl. This was demonstrated by both environmental scanning electron microscope (ESEM) and water vapor adsorption experiments. In particular, NaCl-TiO2 composite showed the highest water adsorption capacity at low relative humidity and at a faster adsorption rate, induced by the high surface energy owing to the presence of TiO2. This result was also confirmed by the kinetics of adsorption, which revealed that not only does NaCl-TiO2 adsorb more water vapor than NaCl-SiO2 or sole NaCl but also the adsorption occurred at a much higher rate. While at room temperature and high relative humidity, the NaCl-SiO2 composite showed the best adsorption properties making it ideal to be used as a hygroscopic material, showing maximum adsorption performance compared to NaCl-TiO2 or sole NaCl. Therefore, NaCl-TiO2 and NaCl-SiO2 composites could be considered as promising hygroscopic materials and potential candidates to replace the existing salt seeding agents.

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The effect of humidity and temperature on the equilibrium moisture content of powders

Cited by 26 publications

References 8 publications

Moisture uptake and tensile strength of bulk solids

Moisture uptake and tensile strength of bulk solids

Characterizing Moisture Uptake and Plasticization Effects of Water on Amorphous Amylose Starch Models Using Molecular Dynamics Methods

Adsorption Capacities of Hygroscopic Materials Based on NaCl-TiO₂ and NaCl-SiO₂ Core/Shell Particles

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The effect of humidity and temperature on the equilibrium moisture content of powders

Cited by 26 publications

References 8 publications

Moisture uptake and tensile strength of bulk solids

Moisture uptake and tensile strength of bulk solids

Characterizing Moisture Uptake and Plasticization Effects of Water on Amorphous Amylose Starch Models Using Molecular Dynamics Methods

Adsorption Capacities of Hygroscopic Materials Based on NaCl-TiO2 and NaCl-SiO2 Core/Shell Particles

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Product

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Adsorption Capacities of Hygroscopic Materials Based on NaCl-TiO₂ and NaCl-SiO₂ Core/Shell Particles