Scientific Results

Rheology of complex fluids with vibrating fiber-optic sensors

Year: 2017

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

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34 – Comprensorio A. Olivetti, 80078 Pozzuoli, Naples, Italy; Dipartimento di Ingegneri Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico II, P.le Tecchio 80, 80125 Naples, Italy; Consiglio Nazionale delle Ricerche, Institute for Polymers, Composites and Biomaterials (IPCB), P.le E. Fermi 1, 80055 Portici, Naples, Italy

Abstract: We demonstrate a new optical rheometer where a fiber Bragg grating sensor (FBG) detects the periodical strain caused by the oscillations of a string tightened within a sample fluid. We show that the viscoelastic moduli 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. After a validation with known-viscosity solutions, the technique is employed to monitor the phase transition of a sol-gel compound. The results provide an insight in the early-stage gelation dynamics that cannot be obtained with traditional rheometers, and allow to clearly identify the gel point as the intersection of the viscoelastic moduli. (C) 2017 Elsevier B.V. All rights reserved.

Journal/Review: SENSORS AND ACTUATORS A-PHYSICAL

Volume: 264      Pages from: 219  to: 223

KeyWords: Fiber Bragg gratings; Gelation; Liquids; Rheometers; Sol-gels; Viscoelasticity, Backreflection; Complex fluids; Current flows; Fiber Bragg Grating Sensors; Gel point; Rheology of complex fluids; Viscoelastic moduli; Viscosity solutions; Fiber optic sensors
DOI: 10.1016/j.sna.2017.08.006

Citations: 2
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English