Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension

Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension

The viscous flow behavior of a 12.5 vol% hydrophobic fumed silica (Aerosil<sup>®</sup> R816) suspension in polypropylene glycol of low molecular weight (PPG400) was studied in a stress-controlled rheometer. The steady flow curve showed shear thickening between two shear thinning regions....

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Bibliographic Details
Main Authors: Jorge H. Sánchez, Francisco J. Rubio-Hernández, Nicolás M. Páez-Flor
Format: Article
Language:English
Published: MDPI AG 2021-05-01
Series:Processes
Subjects:
hydrophobic fumed silica
polypropylene glycol
time-dependent shear viscosity
shear-thickening
Online Access:https://www.mdpi.com/2227-9717/9/5/807
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spelling doaj-b5e2f7d2ccca48c08790e438580190b42021-05-31T23:13:49ZengMDPI AGProcesses2227-97172021-05-01980780710.3390/pr9050807Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica SuspensionJorge H. Sánchez0Francisco J. Rubio-Hernández1Nicolás M. Páez-Flor2Department of Chemical Engineering, Universidad Pontificia Bolivariana, Medellín 050031, ColombiaDepartment of Applied Physics II, Universidad de Málaga, 29071 Málaga, SpainDECEM, Universidad de las Fuerzas Armadas-ESPE, Sangolquí 171103, EcuadorThe viscous flow behavior of a 12.5 vol% hydrophobic fumed silica (Aerosil<sup>®</sup> R816) suspension in polypropylene glycol of low molecular weight (PPG400) was studied in a stress-controlled rheometer. The steady flow curve showed shear thickening between two shear thinning regions. Time-dependent viscosity response provoked by step changes in shear stresses corresponding to the shear-thickening region apparently agrees with thixotropic behavior just after the very initial stages are surpassed. Almost instantaneous jamming can justify misinterpretation of the results.https://www.mdpi.com/2227-9717/9/5/807hydrophobic fumed silicapolypropylene glycoltime-dependent shear viscosityshear-thickening
collection DOAJ
language English
format Article
sources DOAJ
author Jorge H. Sánchez
Francisco J. Rubio-Hernández
Nicolás M. Páez-Flor
spellingShingle Jorge H. Sánchez
Francisco J. Rubio-Hernández
Nicolás M. Páez-Flor
Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension
Processes
hydrophobic fumed silica
polypropylene glycol
time-dependent shear viscosity
shear-thickening
author_facet Jorge H. Sánchez
Francisco J. Rubio-Hernández
Nicolás M. Páez-Flor
author_sort Jorge H. Sánchez
title Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension
title_short Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension
title_full Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension
title_fullStr Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension
title_full_unstemmed Time-Dependent Viscous Flow Behavior of a Hydrophobic Fumed Silica Suspension
title_sort time-dependent viscous flow behavior of a hydrophobic fumed silica suspension
publisher MDPI AG
series Processes
issn 2227-9717
publishDate 2021-05-01
description The viscous flow behavior of a 12.5 vol% hydrophobic fumed silica (Aerosil<sup>®</sup> R816) suspension in polypropylene glycol of low molecular weight (PPG400) was studied in a stress-controlled rheometer. The steady flow curve showed shear thickening between two shear thinning regions. Time-dependent viscosity response provoked by step changes in shear stresses corresponding to the shear-thickening region apparently agrees with thixotropic behavior just after the very initial stages are surpassed. Almost instantaneous jamming can justify misinterpretation of the results.
topic hydrophobic fumed silica
polypropylene glycol
time-dependent shear viscosity
shear-thickening
url https://www.mdpi.com/2227-9717/9/5/807
work_keys_str_mv AT jorgehsanchez timedependentviscousflowbehaviorofahydrophobicfumedsilicasuspension
AT franciscojrubiohernandez timedependentviscousflowbehaviorofahydrophobicfumedsilicasuspension
AT nicolasmpaezflor timedependentviscousflowbehaviorofahydrophobicfumedsilicasuspension
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