Demonstration of QCM Measurement of Viscoelastic Phase Behavior of PVA Sol in Its Freezing–Thawing Process

Seida, Yoshimi

doi:10.1002/masy.201500061

Cited by 2 publications

(2 citation statements)

References 12 publications

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Section: Sensor Dynamic Rangementioning

confidence: 99%

“…Accordingly, these results prove that some kinds of contaminant films behave as viscoelastic media, and their properties change upon desorption under a vacuum. Thus, it is thus expected that the Twin-QCM, with its admittance measurement and analysis techniques[23], is suitable to the investigate property changes of contaminant films.TableIIsummarizes the results during both the deposition and desorption cases. For RTV-S691 with a total deposited mass of 204.6 μg/cm 2 , since the oscillation continued in the deposition, there was a margin for the oscillation to stop; conversely, since the 3rd overtone stopped in the desorption…”

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Twin-CQCM and Twin-TQCM Sensors With Wide Operating Temperature Range for Outgassing and Atomic Oxygen Measurement

et al. 2021

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In this paper, we propose a new Quartz Crystal Microbalance (QCM) sensor with temperature control, which can assess outgassing properties during spacecraft development. It will be referred to as the "Twin-QCM sensor." There are two types. The Twin-Cryogenic QCM (Twin-CQCM) sensor is warmed by a built-in heater with an operating temperature of -190 to +125 • C, and the Twin-Thermoelectric QCM (Twin-TQCM) sensor is warmed and cooled by a builtin Peltier module that can control the temperature within -80 to +125 • C. Using a temperature compensation technique, the temperature-dependent drift of the frequency was found to be less than ±10 ppm over all operating temperatures. An RTD temperature sensor was mounted on the quartz crystal to improve the accuracy of temperature measurement. To confirm the accuracy, an additional temperature sensor installed at the center of the crystal. The sensor output temperature value was compared to that of the additional sensor, with the difference between both temperature sensors being +0.4 to +2.6 • C in the temperature range from -130 to +100 • C. Through the measurement of the sensor's dynamic range, it was found that the deposited contaminant film in a vacuum increasingly changed such physical properties as viscoelasticity as the temperature increases.

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Section: Sensor Dynamic Rangementioning

confidence: 99%

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confidence: 99%

Twin-CQCM and Twin-TQCM Sensors With Wide Operating Temperature Range for Outgassing and Atomic Oxygen Measurement

et al. 2021

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Quartz Crystal Microbalance Monitoring of Poly(Vinyl Alcohol) Sol during the Freeze–Thaw Process

Seida

Ogawa

2016

JMSR

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A quartz crystal microbalance (QCM) working under cryo-conditions was applied to analyzing the gelation and/or phase behavior of poly(vinyl alcohol) (PVA) sol during repeated freeze–thaw processes. The development of a porous structure with the gelation of PVA sol during the freeze–thaw cycle was examined in terms of the thermal behavior of the water in the sol and the viscoelastic behavior of the sol through thermal and QCM analyses. Water was liberated from the hydrophilic PVA during the freeze–thaw process through the aggregation of PVA. The water decreased the freezing temperature and increased the melting temperature because of the development of the porous structure with gelation by the thermal treatment. The state of the water during the gelation was estimated from the phase transition temperature and enthalpy change of the water during the thermal scan by using water-saturated silica gels with a series of pore size distributions. The viscoelasticity of the PVA sol during the freeze–thaw process was measured by cryo-QCM using admittance analysis (QCM-A). The free water and/or porous structure in the PVA sol was found to increase from the viscoelastic point of view by QCM measurements showing a shift in the resonance parameters (fs, R1). A hard gel was confirmed to form by the decrease in fs and the increase in R1 with the thermal scan treatment. The cryo-QCM was found to be an effective probe for clarifying the gelation and phase behavior of PVA sol in detail with high resolution.

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Demonstration of QCM Measurement of Viscoelastic Phase Behavior of PVA Sol in Its Freezing–Thawing Process

Cited by 2 publications

References 12 publications

Twin-CQCM and Twin-TQCM Sensors With Wide Operating Temperature Range for Outgassing and Atomic Oxygen Measurement

Twin-CQCM and Twin-TQCM Sensors With Wide Operating Temperature Range for Outgassing and Atomic Oxygen Measurement

Quartz Crystal Microbalance Monitoring of Poly(Vinyl Alcohol) Sol during the Freeze–Thaw Process

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