Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance

Granstaff, V E; Martin, S J

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Title: Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance

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Abstract

A method is described, using a quartz crystal microbalance, to obtain simultaneous measurement of solid mass accumulation and changes in liquid density-viscosity product. The simultaneous real-time measurements of electrical parameters yields that changes in surface mass can be differentiated from changes in solution properties. Two methods to obtain the admittance/frequency data are employed.

Inventors:: Granstaff, V E; Martin, S J

Issue Date:: 1993-04-13

OSTI Identifier:: 6292433

Patent Number(s):: 5201215

Application Number:: PPN: US 7-779727

Assignee:: Dept. of Energy, Washington, DC (United States)

DOE Contract Number:: AC04-76DP00789

Resource Type:: Patent

Resource Relation:: Patent File Date: 17 Oct 1991

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING; SLURRIES; DENSITY; LOADING RATE; VISCOSITY; MEASURING METHODS; MICROBALANCES; MONITORING; PARTICULATES; REAL TIME SYSTEMS; BALANCES; DISPERSIONS; MEASURING INSTRUMENTS; MIXTURES; PARTICLES; PHYSICAL PROPERTIES; SUSPENSIONS; WEIGHT INDICATORS; 420500* - Engineering- Materials Testing

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                    Granstaff, V E, and Martin, S J. Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance.  United States: N. p., 1993. 
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                    Granstaff, V E, & Martin, S J. Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance.  United States.

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                    Granstaff, V E, and Martin, S J. Tue .  
        "Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance".  United States.

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@article{osti_6292433,

  title        = {Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance},

  author       = {Granstaff, V E and Martin, S J},

  abstractNote = {A method is described, using a quartz crystal microbalance, to obtain simultaneous measurement of solid mass accumulation and changes in liquid density-viscosity product. The simultaneous real-time measurements of electrical parameters yields that changes in surface mass can be differentiated from changes in solution properties. Two methods to obtain the admittance/frequency data are employed.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1993},

  month        = {4}

}

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Method for simultaneous measurement of mass loading and fluid property changes using a quartz crystal microbalance

Patent Granstaff, Victoria E [Albuquerque, NM]; Martin, Stephen J [Albuquerque, NM]

A method, using a quartz crystal microbalance, to obtain simultaneous measurement of solid mass accumulation and changes in liquid density-viscosity product. The simultaneous real-time measurements of electrical parameters yields that changes in surface mass can be differentiated from changes in solution properties. Two methods to obtain the admittance/frequency data are employed.
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Using quartz crystal microbalances to simultaneously sense mass accumulation and solution properties [Book Chapter]

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A lumped-element equivalent circuit model is presented that describes the near resonance electrical characteristics of a quartz crystal microbalance (QCM) simultaneously loaded by a surface mass layer and a contacting liquid. The model was derived by solving the boundary-value problem for coupled mechanical displacement and electrical potential; this results in circuit elements that are explicitly related to physical properties of the quartz, the perturbing mass layer, and the contacting liquid. The effects of mass and/or liquid loading on the admittance-vs.-frequency behavior are predicted from the model and compared with experimental impedance analyzer measurements. Surface mass accumulation causes a simple translationmore » « less
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Current methods of converting quartz crystal microbalance frequency shifts to mass are frequently quite inaccurate. An improved method is presented which reduces the error to a fraction of a percent. The algorithm requires a knowledge of the crystal function and the mass loading distribution.
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Mass changes in NSTX Surface Layers with Li Conditioning as Measured by Quartz Microbalances

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Dynamic retention, lithium deposition, and the stability of thick deposited layers were measured by three quartz crystal microbalances (QMB) deployed in plasma shadowed areas at the upper and lower divertor and outboard midplane in the National Spherical Torus Experiment (NSTX). Deposition of 185 {micro}/g/cm{sup 2} over 3 months in 2007 was measured by a QMB at the lower divertor while a QMB on the upper divertor, that was shadowed from the evaporator, received an order of magnitude less deposition. During helium glow discharge conditioning both neutral gas collisions and the ionization and subsequent drift of Li{sup +} interrupted the lithiummore » « less
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Dynamic retention of deuterium, lithium deposition, and the stability of thick deposited layers were measured by three quartz crystal microbalances (QMB) deployed in plasma shadowed areas at the upper and lower divertor and outboard midplane in the National Spherical Torus Experiment (NSTX) equipped with a lithium evaporator. Deposition of 185 μg/cm2 over 3 months in 2007 was measured by a QMB at the lower divertor while a QMB on the upper divertor, that was shadowed from the evaporator, received an order of magnitude less deposition. During helium glow discharge conditioning both neutral gas collisions and the ionization and subsequent driftmore » « less
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