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Rheology of complex fluids with vibrating fiber-optic sensors

  Articoli su Riviste JCR/ISI  (anno 2017)

Autori:  Malara P., Zullo R., Filippone G., Verdolotti L., Lavorgna M., Giorgini A., Avino S., Gagliardi G

Affiliazione Autori:  CNR-INO

Riassunto:  tWe demonstrate a new optical rheometer where a fiber Bragg grating sensor (FBG) detects the periodicalstrain caused by the oscillations of a string tightened within a sample fluid. We show that the viscoelasticmoduli of complex fluids can be obtained instantaneously from the FBG optical backreflection signal,without need of any current flow in the wire or magnetic field that could affect the sample chemistry. Aftera validation with known-viscosity solutions, the technique is employed to monitor the phase transitionof a sol-gel compound. The results provide an insight in the early-stage gelation dynamics that cannotbe obtained with traditional rheometers, and allow to clearly identify the gel point as the intersection ofthe viscoelastic moduli

Volume n.:  219      Pagine da: 264  a: 223
Parole chiave: optical fiber sensor - rheometer - vibrometer - viscosity - sol-gel

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