The Enzymic Determination of Glycerol

Newman, Alan

doi:10.1016/b978-0-12-065050-7.50009-8

Cited by 10 publications

(9 citation statements)

References 36 publications

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“…The refractive index varied between approximately 1.4617 and 1.4577, indicating a water content ranging from 8-10 wt%. 27 The dielectric constant was therefore expected to vary between 44.42 and 45.50, a difference that was not detectable by the sensing circuit used. This level of water content is the expected equilibrium value for temperatures ranging from 20-25 uC at a relative humidity of 40-50%.…”

Section: Sensor Circuit Layout and Experimental Setupmentioning

confidence: 99%

“…For completely soluble mixtures, like glycerol and water or TEG and water, the mixture permittivity is proportional to the weight ratio of the two components. 27,31,32 The percentage of water absorption by TEG can therefore be estimated from the ratio (e meas TEG 2 e o TEG )/(e water 2 e o TEG ) = 15.7 wt%, where e water = 80.22 and the superscript ''o'' represents no water content. 31 The values measured by the sensor are therefore consistent with the expected water uptake for a relative humidity of 40-50%.…”

Section: A Liquid Sensor For Single and Binary Component Mixturesmentioning

confidence: 99%

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Capacitive sensing of droplets for microfluidic devices based on thermocapillary actuation

et al. 2004

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The design and performance of a miniaturized coplanar capacitive sensor is presented whose electrode arrays can also function as resistive microheaters for thermocapillary actuation of liquid films and droplets. Optimal compromise between large capacitive signal and high spatial resolution is obtained for electrode widths comparable to the liquid film thickness measured, in agreement with supporting numerical simulations which include mutual capacitance effects. An interdigitated, variable width design, allowing for wider central electrodes, increases the capacitive signal for liquid structures with non-uniform height profiles. The capacitive resolution and time response of the current design is approximately 0.03 pF and 10 ms, respectively, which makes possible a number of sensing functions for nanoliter droplets. These include detection of droplet position, size, composition or percentage water uptake for hygroscopic liquids. Its rapid response time allows measurements of the rate of mass loss in evaporating droplets.

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Section: Sensor Circuit Layout and Experimental Setupmentioning

confidence: 99%

Section: A Liquid Sensor For Single and Binary Component Mixturesmentioning

confidence: 99%

Capacitive sensing of droplets for microfluidic devices based on thermocapillary actuation

et al. 2004

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“…Accurate values for the viscosity 7/ of pure glycerol exist above 0~ [16], and if we combine these with our readings between -3~ and + 50.6~ to form the Walden product A~ obtain results shown in figure 4. In order to calculate A% the molar conductivity at infinite dilution, from our measured values of a/x at various temperatures we have used a glycerol density p at temperature t calculated from p/(kg m -3) = 1273.7 -0.637(t/~ the equation being a least squares fit to the data between 0~ and 100~ given by Newman [19] in his table II. This equation also provides a good representation of the density data [20,21] down to about -85~…”

Section: Ion Mobilitymentioning

confidence: 99%

Ionic mobility and dielectric relaxation in supercooled liquid KCl-glycerol solutions

Champeney

Kaddour

1984

Molecular Physics

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Measurements of the electrical conductivities of liquid and supercooled liquid KCl-glycerol solutions between + 50.6~ and -89.1~ are described. Time domain measurements of dielectric relaxation in pure glycerol between -78.1 ~ and -91.0~ and in KCl-glycerol solutions between -77.5~ and -89.1~ are also described. Empirical equations are presented which in each case describe the non-Arrhenius temperature dependence over more than 12 decades in value with a r.m.s, deviation of less than 15 per cent. A ' power law ' fit is found to be slightly better than a ' Vogel-TammannFulcher ' fit in each case. The temperature dependence of Walden product for KCl-glycerol solutions is discussed, and the relaxation data for pure glycerol is discussed in the light of the Kauzmann paradox.

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“…The thermodynamics properties of glycerol can be found in [18,19]. The properties in the temperature range [0, 50]…”

Section: Fluid and Setupmentioning

confidence: 99%

MRI temperature and velocity measurements in a fluid layer with heat transfer

Leclerc

Métivier

2018

Exp Fluids

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To cite this version:Sébastien Leclerc, C. Métivier. MRI temperature and velocity measurements in a fluid layer with heat transfer. Experiments in Fluids, Springer Verlag (Germany), 2018, 59 (2), 10.1007/s00348-018-2494-3. hal-01693075Noname manuscript No. Résumé Magnetic Resonance Thermometry (MRT) is an innovative technique which can provide 2D and 3D temperature measurements using Magnetic Resonance Imaging (MRI). Despite the powerful advantages of MRT, this technique is sparcely developed and used in the engineering sciences. In this paper, we investigate the possibility to measure temperatures with MRI in a fluid layer submitted to heat transfer. By imposing a vertical temperature gradient, we study the temperature fields in both conductive and convective regimes. The temperature fields are obtained by measuring the transverse relaxation time T 2 in glycerol, a Newtonian fluid. The MRT protocol is described in detail and the results are presented. We show that for a conductive regime, temperature measurements are in very good agreement with the theoretical profile. In the convective regime, when comparing the temperature and velocity fields obtained by MRI, we get an excellent agreement in terms of flow structure. Temperature uncertainties are found to be less than 1• C for all our results.

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The Enzymic Determination of Glycerol

Cited by 10 publications

References 36 publications

Capacitive sensing of droplets for microfluidic devices based on thermocapillary actuation

Capacitive sensing of droplets for microfluidic devices based on thermocapillary actuation

Ionic mobility and dielectric relaxation in supercooled liquid KCl-glycerol solutions

MRI temperature and velocity measurements in a fluid layer with heat transfer

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