Measurements of sorption isotherms and diffusion coefficients by means of a magnetic suspension balance

Mămăligă, Ioan; Schabel, Wilhelm; Kind, Matthias

doi:10.1016/s0255-2701(03)00077-1

Cited by 65 publications

(60 citation statements)

References 17 publications

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“…The Raman intensity is linear proportional to the concentration of a specific component and can be described as follows [5] : A special cell holder has been developed in order to allow the laser beam to enter the probe horizontally.…”

Section: Calibration Of Raman Spectramentioning

confidence: 99%

Measurements of Concentration Profiles in Polymeric Solvent Coatings by Means of an Inverse Confocal Micro Raman Spectrometer—Initial Results

2004

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Concerning quality and drying time of a process the key issue is the progression of the concentration profiles within the film during drying. This contribution reports on the development of a new measuring technique, an Inverse-Confocal-Micro-Raman-Spectrometer, for online measurements of concentration profiles during drying in thin (5-200 mm) polymeric solvent coatings. The spatial and temporal resolution of the measurements is up to one micron and one second. A calibration method has been developed by taking Raman spectra of different, precisely concentrated samples in sealed ORDER REPRINTS quartz glass cells and by calculating the ratio of the intensities of the characteristic Raman peaks. The accuracy of this basic calibration method is very good over a wide concentration range. Initial investigations were carried out on the polymer solvent systems: polyvinyl acetate(PVAc)-toluene, PVAc-methanol, PVAc-benzene, and PVAc-methanol-toluene, PVAc-methanol-benzene.

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Section: Calibration Of Raman Spectramentioning

confidence: 99%

Measurements of Concentration Profiles in Polymeric Solvent Coatings by Means of an Inverse Confocal Micro Raman Spectrometer—Initial Results

2004

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“…Durch den höheren Partialdruck des Lösungsmittels trocknet der Polymerfilm bei höheren Temperaturen wesentlich schneller. Auch im zweiten ± durch die filmseitige Diffusion limitierte ± Trocknungsbereich verläuft die Trocknung mit zunehmender Temperatur schneller, da die Diffusionskoeffizienten erwartungsgemäû mit der Temperatur ansteigen [2]. Im Vergleich zu Methanol-PVAc-Lösungen dauert die Trocknung bei Toluol aufgrund des kleineren Diffusionskoeffizienten wesentlich länger.…”

Section: Trocknungsversucheunclassified

Messung und Simulation von Konzentrationsprofilen bei der Trocknung binärer Polymerlösungen

Schabel¹,

Scharfer

Müller

et al. 2003

Chemie Ingenieur Technik

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“…The concept of magnetic suspension allows all these problems to be avoided. [8] Therefore, these types of balance have been employed in several gravimetric systems for measurement under extreme conditions. [9] This article describes a device built in our laboratory, based on a magnetic suspension balance.…”

mentioning

confidence: 99%

Mass Diffusivity of Beech Determined in Unsteady-State Using a Magnetic Suspension Balance

Perré¹,

Houngan²,

Jacquin³

2007

Drying Technology

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This article presents an experimental device and the procedure used to determine the mass diffusivity coefficient of beech from adsorption/desorption cycles. The experimental device is built around a magnetic suspension balance that is able to achieve accurate mass measurements over a wide range of temperature and relative humidity. The value of mass diffusivity is determined using a slope method from the transient period of relative humidity steps. Experimental values are presented for beech in longitudinal and tangential directions.

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Measurements of sorption isotherms and diffusion coefficients by means of a magnetic suspension balance

Cited by 65 publications

References 17 publications

Measurements of Concentration Profiles in Polymeric Solvent Coatings by Means of an Inverse Confocal Micro Raman Spectrometer—Initial Results

Measurements of Concentration Profiles in Polymeric Solvent Coatings by Means of an Inverse Confocal Micro Raman Spectrometer—Initial Results

Messung und Simulation von Konzentrationsprofilen bei der Trocknung binärer Polymerlösungen

Mass Diffusivity of Beech Determined in Unsteady-State Using a Magnetic Suspension Balance

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