Rheology of Sterically Stabilized Ceramic Suspensions

Rajaiah, J.; Ruckenstein, Eli; Andrews, Graham F.; Forster, E. O.; Gupta, Rakesh

doi:10.1021/ie00034a012

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…When the amount of dispersant exceeds the amount needed to cover the surface, the concentration of dispersant in the media increases significantly. Basic sites on the dispersant may be protonated. ,, The protonated−dispersant complex may be further stabilized by forming reverse micelles together with preexisting free dispersant. The relatively large structure of the micelle helps prevent ion pairing of the positive counterion charge onto the negatively charged particle surfaces.…”

Section: Discussionmentioning

confidence: 99%

Electrostatic Stabilization of Colloids in Carbon Dioxide: Electrophoresis and Dielectrophoresis

et al. 2005

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Over the past decade, steric stabilization has been achieved for a variety of inorganic and organic colloids in supercritical fluid carbon dioxide (scCO2). Herein we demonstrate that colloids may also be stabilized in CO2 by electrostatic forces, despite the ultralow dielectric constant of 1.5. Zeta potentials of micrometer-sized water droplets, measured in a microelectrophoresis cell, reached -70 mV corresponding to a few elementary charges per square micrometer of droplet surface. This degree of charge was sufficient to stabilize water/CO2 emulsions for an hour, even with water volume fractions of 5%. Hydrogen ions partition preferentially, relative to bicarbonate ions, from the emulsion droplets to the cores of surfactant micelles in the diffuse double layer surrounding the droplets. The micelles, formed with a low molecular weight branched hydrocarbon surfactant, prevent ion pairing of the hydrogen counterions to the negatively charged emulsion droplets. Dielectrophoresis of the water droplets at a frequency of 60 Hz leads to chains containing a dozen droplets with lengths of 50 mum. The ability to form electrostatically stabilized colloids in carbon dioxide is particularly useful in practical applications, because steric stabilization in CO2 is often limited by the poor solvation of the stabilizers.

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Section: Discussionmentioning

confidence: 99%

Electrostatic Stabilization of Colloids in Carbon Dioxide: Electrophoresis and Dielectrophoresis

et al. 2005

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“…In order to obtain a stable colloid, the individual particles have to be kept apart either by repulsive electrostatic forces, by adsorbed organic molecules or by combining both options ( Figure 6) (Lu, 2006;Rajaiah, 1994). The principle of electrostatic stabilization is shown in Figure 7.…”

Section: Slip Casting and Pressure Slip Castingmentioning

confidence: 99%

Advanced Manufacturing of Hard Ceramics

Gadow

Kern

2014

Comprehensive Hard Materials

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“…As suspensões são vertidas em cilindros graduados e medidas da interface de sedimentação são realizadas em intervalos de tempo pré determinados, entretanto esse teste deixa a desejar na identificação de processos de desestabilização em escala microscópica (BURGOS-MONTES; MORENO, 2009;DING et al, 2020;DUFAUD et al, 2002;GAO et al, 2011;SONG et al, 2019;SUN et al, 2019;ZHANG et al, 2017), além desse, fato a literatura é carente de um padrão ou até mesmo um consenso com relação a duração do experimento. RAJAIAH et al, 1994). O modelo de Krieger & Dougherty (1959) tem sido aplicado por vários autores ZHANG et al, 2017) e tem se mostrado de grande eficiência com dados experimentais.…”

Section: Estabilidadeunclassified

Ceramização, reforçamento e manufatura aditiva de hidroxiapatita de origem bovina

Erbereli

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This work aims to meet the growing demand for products made from biomaterials that can minimize the problems of lack of bone tissue resulting from diseases, traffic and/or work accidents and sports, aesthetic and dental practices of both young and old people. In this scenario, hydroxyapatite of bovine origin from animals with traceability from birth to slaughter is of great importance among biomaterials as it presents biocompatibility and great similarity with the human bone structure. The advancement of medical practices in the field of computational imaging has driven personalized planning of bone repairs, which requires, at the same time, the ability to manufacture bodies as complex externally and internally as required.In this work, to contribute to meeting this demand, the aim is to develop mimetic and personalized bone implants. For this purpose, a process was developed to obtain hydroxyapatite of bovine origin, which is transformed into reactive ceramic raw material through calcination and grinding, route which eliminates any biological risk, as a whole additive manufacturing is developed and directed with this material to obtain a body with external (shape, surface, dimension) and internal (communicating porosity for intra-osseous vascularization) characteristics. To meet this perspective, the precursor bovine bone was classified, processed and reinforced to become a bioceramic hydroxyapatite with adequate properties, at a very low cost, renewable and accessible to all countries. A 3D printing machine was developed in the laboratory itself, a top-down type with image projection and photopolymerization in a ceramic paste vat, where the test specimens were printed and validated by printing ceramic pastes developed from low solid loading (15% in volume), up to high solid loadings of the order of 40% by volume. It is possible to conclude that the production of scaffolds, as well as hydroxyapatite mimetic bones of traced bovine origin, presents a promising combination that can meet the mechanical and biological characteristics of implants applied to tissue engineering and that associated with additive manufacturing technological processes can meet the medical need with a commitment to high performance, complexity of form, while being medically safe.

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Rheology of Sterically Stabilized Ceramic Suspensions

Cited by 9 publications

References 11 publications

Electrostatic Stabilization of Colloids in Carbon Dioxide: Electrophoresis and Dielectrophoresis

Electrostatic Stabilization of Colloids in Carbon Dioxide: Electrophoresis and Dielectrophoresis

Advanced Manufacturing of Hard Ceramics

Ceramização, reforçamento e manufatura aditiva de hidroxiapatita de origem bovina

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