Evaluation of the Effect of Solid Loadings on Rheological Properties of Highly Concentrated Biocompatible Nanoparticle Suspensions

Result code in IS VaVaI

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Alternative codes found

RIV/60461373:22330/16:43902577

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Evaluation of the Effect of Solid Loadings on Rheological Properties of Highly Concentrated Biocompatible Nanoparticle Suspensions

Original language description

Preparation and colloidal dispersion of highly concentrated biocompatible nanoparticles suspensions are vital for fabrication of dense bioceramic nanocomposites with improved mechanical and microstructural properties for biomedicine applications. This paper presents formation and rheological characterization of highly concentrated biocompatible aqueous ZrO2 nanosuspensions for such applications. The rheological properties including viscosity (?), shear rate (?), and shear stress (?) were investigated in relation to a wide range of solid loading (?, by weight = 75 - 78 mass%). Maximum solid loading (?max) was estimated with a constant 0.9 mass% concentration of a new type of anionic polyelectrolyte Dolapix CE64, suitable for casting of materials. A colloidal model was proposed to visualize the effect of solid loading on colloidal stability, rheological behavior and green microstructure of samples after casting. The maximum solid loading (?max) was estimated to be 77 mass% based on the dependence of both viscosity (?) and yield stress (?0) on solid loading (?). For further validation, the maximum solid loading was compared and fitted by different rheological flow. models with a correlation factor r = 0.998 for Herschel-Bulkley model, r = 0.999 forPower law model and r = 0.920 for Bingham model at shear rate ? (50 s-1). All concentrated ZrO2 nanosuspensions exhibited shear-thinning behaviour. The results obtained from rheological measurements, scanning electron microscopy imaging and flow models validate our proposed hypothesis for prediction of maximum solid loading and visualization of quality of green microstructures after casting. These results contribute to preparation, characterization, and processing of highly concentrated bio/nanoparticles suspensions; aiming to fabricate highly dense bio/nanocomposite materials with specific functionality.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CF - Physical chemistry and theoretical chemistry

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

HSOA Journal of Nanotechnology: Nanomedicine and Nanobiotechnology

ISSN

2381-2044

e-ISSN

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Volume of the periodical

3

Issue of the periodical within the volume

May 2016

Country of publishing house

US - UNITED STATES

Number of pages

7

Pages from-to

1-7

UT code for WoS article

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EID of the result in the Scopus database

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