A review on the rheological behavior and formulations of ceramic suspensions for vat photopolymerization

An overview is given of the rheological behavior of biopolymers in aqueous suspensions and of their role in new ceramic shaping processes (starch consolidation casting and carrageenan gel casting). In particular, we give a state-of-the-art account of the viscometric behavior, measured via rotational viscometry (apparent viscosity, including its shear-rate and concentration dependence), and the viscoelastic properties characterized via oscillatory shear rheometry (storage modulus, loss modulus and phase angle, including their temperature dependence), of starch-water systems, starchcontaining alumina suspensions, carrageenan-water systems and carrageenan-containing zirconia suspensions.

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Rheology and Rotational Rheometry of Concentrated Clay Based Ceramic Suspensions: Steps From Measured to Relevant Data

Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B ◽

10.1115/imece2010-38487 ◽

2010 ◽

Author(s):

Jana Andertova´ ◽

Frantisˇek Rieger

Keyword(s):

Experimental Data ◽

Rheological Behavior ◽

Flow Behavior ◽

Slip Casting ◽

Rheological Parameters ◽

Technological Parameters ◽

Flow Curves ◽

Rotational Viscometer ◽

Flow Behavior Index ◽

Ceramic Suspensions

The rheological behavior of ceramic suspensions affects significantly wet ceramic processing. On the base of knowledge of rheological parameters the technological parameters of various processes (mixing, batching, spray drying, slip casting, of rheological parameters the selection of proper geometry and sensors must be done. From the data measured the flow curves must be designed and parameters of appropriate rheological models must be calculated. The power-law is the simplest model mostly used for description of rheological behavior of non-Newtonian fluids. Using this model, the dependence of shear stress on shear rate can be expressed. The aim of this paper is to show how the flow curves necessary for parameters of rheological model evaluation can be obtained from primary experimental data received from measurements on rotational viscometer. The two arrangements of rotational viscometer method were used in rheological measurements. The procedure of experimental data to obtain parameters K (coefficient of consistency) and n (flow behavior index) is presented.

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Rheological Behavior of Alumina Aqueous Suspension for Extrusion Gelation Freeform Fabrication

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.984 ◽

2007 ◽

Vol 336-338 ◽

pp. 984-987 ◽

Cited By ~ 2

Author(s):

Zhi Yong Yu ◽

Xi Wei Qi ◽

Yong Huang ◽

Chang An Wang ◽

Shi Xi Ouyang

Keyword(s):

Rheological Behavior ◽

Solid Freeform Fabrication ◽

Aqueous Suspension ◽

Shear Thickening ◽

Freeform Fabrication ◽

Acrylic Latex ◽

Solids Loading ◽

Thickening Behavior ◽

Binder Composition ◽

Ceramic Suspensions

Extrusion gelation freeform fabrication (EGFF) is a new solid freeform fabrication technique to fabricate ceramic parts. The study of ceramic suspensions rheological behavior is essential to a better understanding of parts fabrication through EGFF process. In this paper, the effects of dispersant concentrations, solids loading and binder composition on the rheological behavior of alumina suspensions were examined. The optimal amount of dispersant was found to be about 0.1 wt.%. The suspensions with 50 vol.% alumina and 1wt.% sodium alginate show shear thickening behavior. Such behavior is unfavorable for extrusion gelation freeform fabrication. By addition of PVA or styrene-acrylic latex, the rheological behavior of suspensions was changed. The addition of PVA or latex has a great effect on the viscosity of the suspensions and the type of their rheological behavior. The ceramic suspensions with PVA or latex were found to be shear thinning more suitable for EGFF.

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Rheological Behavior of Highly Filled Ceramic Suspensions.

Journal of the Society of Powder Technology Japan ◽

10.4164/sptj.31.241 ◽

1994 ◽

Vol 31 (4) ◽

pp. 241-247

Author(s):

Hachiro NAKAMARU ◽

Yasushi TAWARA ◽

Yoichi NAGASE

Keyword(s):

Rheological Behavior ◽

Ceramic Suspensions

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From biorefineries to bioproducts: conversion of pretreated pulp from biorefining streams to lignocellulose nanofibers

TAPPI Journal ◽

10.32964/tj18.4.233 ◽

2019 ◽

Vol 18 (4) ◽

pp. 233-241

Author(s):

CHENGGUI SUN ◽

RICHARD CHANDRA ◽

YAMAN BOLUK

Keyword(s):

Energy Consumption ◽

Enzymatic Hydrolysis ◽

Rheological Behavior ◽

Material Basis ◽

Softwood Pulp ◽

Energy Consumptions ◽

Hardwood Pulp ◽

The Stability ◽

Lignocellulose Nanofibers

This study investigates the use of pretreatment and enzymatic hydrolysis side streams and conversion to lignocellulose nanofibers. We used a steam-exploded and partial enzymatic hydrolyzed hardwood pulp and an organosolv pretreated softwood pulp to prepare lignocellulose nanofibers (LCNF) via microfluidization. The energies applied on fibrillation were estimated to examine the energy consumption levels of LCNF production. The energy consumptions of the fibrillation processes of the hardwood LCNF production and the softwood LCNF production were about 7040-14080 kWh/ton and 4640 kWh/ton on a dry material basis, respectively. The morphology and dimension of developed hardwood and softwood LCNFs and the stability and rheological behavior of their suspensions were investigated and are discussed.

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