Viscosity sensing in heated alkaline zeolite synthesis media

Follens, Lana; Reichel, Erwin K.; Riesch, Christian; Vermant, Jan; Martens, Johan A.; Kirschhock, Christine; Jakoby, Bernhard

doi:10.1039/b816040f

Cited by 24 publications

(20 citation statements)

References 37 publications

(43 reference statements)

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“…This is related to the onset of crystal formation and growth at this point. Viscosity values obtained from both parameters diverge after 20 h indicating non-Newtonian behavior as discussed above (Follens et al, 2009).…”

Section: Monitoring Of Zeolite Synthesismentioning

confidence: 96%

Condition monitoring of viscous liquids using microsensors

Jakoby

Reichel

Riesch

et al. 2009

Elektrotech. Inftech.

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Vibrating microsensors offer possibilities for the monitoring of viscous substances in industrial processes online. In this contribution we review our recent work on suitable sensing technologies and the associated impact in terms of the probed rheological domains. Furthermore, selected applications, i.e. the sensing of engine oil and the monitoring of zeolite synthesis aboard the ISS are described.

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Section: Monitoring Of Zeolite Synthesismentioning

confidence: 96%

Condition monitoring of viscous liquids using microsensors

Jakoby

Reichel

Riesch

et al. 2009

Elektrotech. Inftech.

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show abstract

“…The sensor interface will be used in experiments, in which the viscosity of the sample liquid that has to be measured will change drastically [6], hence the Q-factor of the loaded sensor will be significantly lower than that of resonators operating in vacuum or gaseous environments. Consequently, a freerunning oscillator circuit is not an optimal evaluation method for this application.…”

Section: Sensor Interfacementioning

confidence: 99%

“…The measurement is performed using a thickness shear mode quartz crystal resonator (QCR) for viscosity and density measurement [4], [5]. The processes during the synthesis experiment involve a harsh chemical environment of electrochemically active liquid at a pH-value up to 13 [6]. In order to avoid interferences of the measurement due to the conductivity and electrochemical activity of the liquid the resonator has to be mounted in a way that keeps the liquid from contacting both electrodes.…”

Section: Introductionmentioning

confidence: 99%

Smart analog compensation of spurious signals for a fully differential interface for resonating sensors

2010

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Resonating sensors are used for measurement tasks in a wide range of applications. Depending on sensor type and operating conditions, the signals of these sensors are often afflicted with unwanted components induced by parasitic sensor effects or the implemented sensor interface. Especially when using digitizing interface circuits it can be advantageous concerning the utilizable resolution of the system to compensate these parasitic signals before the analog to digital conversion. In this contribution, a method of analog compensation for parasitic signal components is presented, that is implemented in an largely digital impedance analyzer circuit for resonating sensors.

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“…For online process monitoring (e.g., in zeolithe synthesis [1], in medical analysis, food production, and etc.) often the two physical properties mass density and (shear) viscosity are of primary interest.…”

Section: Introductionmentioning

confidence: 99%

A semi-numerical model of a lateral field excited piezoelectric fluid sensor

2010

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The utilization of piezoelectric discs excited by lateral fields (LFE) for liquid phase sensing was first proposed by Vig in 1998. Since then, experimental investigations showed that LFE resonators show unique differences compared to common thickness field excited (TFE) resonators when used for liquid sensing. Due to the various modes of oscillation excited by LFE, the impedance spectrum cannot be properly calculated by one dimensional analysis, mostly sufficient for TFE. In our contribution, the interaction of piezoelectric disc and sample liquid, which is not fully manageable in an analytical way or too comprehensive for FEM, is modeled in a full-wave fashion by means of a semi-numerical method in the spectral domain (wavenumbers). The simulation results -shown for AT cut quartz and lithium niobate -enable a detailed analysis of the associated modes and their interaction with the liquid and qualitatively reproduce experimental data given in the literature.

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Viscosity sensing in heated alkaline zeolite synthesis media

Abstract: A quartz disc resonator operating in thickness shear mode was used for the in situ monitoring of the viscosity during zeolite crystal formation.

Cited by 24 publications

References 37 publications

Condition monitoring of viscous liquids using microsensors

Condition monitoring of viscous liquids using microsensors

Smart analog compensation of spurious signals for a fully differential interface for resonating sensors

A semi-numerical model of a lateral field excited piezoelectric fluid sensor

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