Ueber die rechnerische Darstellung des Strukturgebietes der Viskosität

Ostwald, Wolfgang

doi:10.1007/bf01496959

Cited by 143 publications

(58 citation statements)

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“…[15] The viscous behavior of the disperse system may be described by the consistency K and the flow index n in a power law according to the Ostwald-de-Waele model. [17] However, slurries used for RPC manufacturing are commonly characterized by the presence of a yield point. The Ostwald-de-Waele model does not take a yield point into account as with the Bingham equation, for example, which, on the contrary, is not able to approximate a nonNewtonian, or shear thinning fluid.…”

Section: Rheological Behaviormentioning

confidence: 99%

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

et al. 2017

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Reticulated ceramic foams are used in a wide range of applications such as filters, catalyst supports, lightweight materials, energy absorptions materials, or as scaffolds for tissue engineering as the most common ones. Based on gaseous foaming processes of polymers, a stochastic distribution of closed pores is obtained. By reticulation processing thin foam windows are removed between cells turning a closed cell into an open cell structure. These foams are used as template for porous ceramics manufacturing: With different processing approaches, for example, with dip coating of a ceramic slurry and a subsequent (multistep) thermal treatment ceramic reticulate foams are obtained. A variety of material properties strongly depend on the cell and strut size, as well on material composition. Functionalization of ceramic foam surfaces (outer surface functionalization), for example, with zeolites or nanosized aggregates lead to an increase of the specific surface area or provides catalytic or heat storage functionality. Filling of struts (inner surface functionalization) may lead to improved mechanical stability or may provide functionalities such as electric conductivity. The present work summarizes the processing steps from the template foam to the final cellular ceramic, functionalization strategies, and the most common characterization techniques.

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Section: Rheological Behaviormentioning

confidence: 99%

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

et al. 2017

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“…[19] The exponent n indicates Newtonian behavior for n ¼ 1 and decreases with increasing pseudoplastic (shear thinning) behavior to n << 1. None of the investigated slurries exhibited a thixotropic behavior.…”

Section: Rheological Investigationsmentioning

confidence: 99%

Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

et al. 2017

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Infiltration processing of reticulated porous alumina ceramics (RPC) from reticulated foam manufacturing is investigated by micro computed tomography. Infiltration is carried out with colloidal alumina slurries. Successful infiltration is found to be a function of the RPCs starting microstructure and the particle size of the alumina in the colloidal infiltration system. Suitable infiltration conditions are specified. As a result, RPCs with a low relative density show a fivefold compressive strength after infiltration, as compared to their non-infiltrated RPC counterparts. The highest strength of infiltration processed alumina RPCs at a porosity of 90% is found to be 1.6 MPa, and besides a significant increase of the compressive strength, the thermal conductivity is improved to be 1.5 W m À1 K À1 after infiltration.

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“…94,138,[334][335][336] This shear-thinning behavior was described by a power law or Ostwald-de Waele relationship as shown in Eq. (17), 147,337 where g is viscosity, c is shear rate, and K and n are fitting parameters. K is known as the flow consistency index, giving the viscosity at a shear rate of 1 s…”

Section: A Suspension Viscositymentioning

confidence: 99%

Review Article: Flow battery systems with solid electroactive materials

Koenig

2017

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Energy storage is increasingly important for a diversity of applications. Batteries can be used to store solar or wind energy providing power when the Sun is not shining or wind speed is insufficient to meet power demands. For large scale energy storage, solutions that are both economically and environmentally friendly are limited. Flow batteries are a type of battery technology which is not as well-known as the types of batteries used for consumer electronics, but they provide potential opportunities for large scale energy storage. These batteries have electrochemical recharging capabilities without emissions as is the case for other rechargeable battery technologies; however, with flow batteries, the power and energy are decoupled which is more similar to the operation of fuel cells. This decoupling provides the flexibility of independently designing the power output unit and energy storage unit, which can provide cost and time advantages and simplify future upgrades to the battery systems. One major challenge of the existing commercial flow battery technologies is their limited energy density due to the solubility limits of the electroactive species. Improvements to the energy density of flow batteries would reduce their installed footprint, transportation costs, and installation costs and may open up new applications. This review will discuss the background, current progress, and future directions of one unique class of flow batteries that attempt to improve on the energy density of flow batteries by switching to solid electroactive materials, rather than dissolved redox compounds, to provide the electrochemical energy storage.

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Ueber die rechnerische Darstellung des Strukturgebietes der Viskosität

Cited by 143 publications

References 0 publications

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

Increased Mechanical Stability and Thermal Conductivity of Alumina Reticulated Porous Ceramics (RPC) by Nanoparticle Infiltration Processing

Review Article: Flow battery systems with solid electroactive materials

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