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Finke, S.; Feenstra, Frits

doi:10.1023/a:1016137723481

Cited by 32 publications

(6 citation statements)

References 4 publications

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“…First, the water was held in a flask and then delivered to the CG@MPT-h sponge by degreasing cotton. Second, the degreasing cotton passes through the polyethylene (EPE) foam without light-absorbing energy 61 and water absorption properties and reaches the bottom of the CG@MPT-h sponge. The EPE is placed on the mouth of the flask to block the conduction of heat between the CG@MPT-h sponge and the environment.…”

Section: Resultsmentioning

confidence: 99%

Construction of a Three-Dimensional Interpenetrating Network Sponge for High-Efficiency and Cavity-Enhanced Solar-Driven Wastewater Treatment

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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It is well known that the photothermal conversion performance of solar-driven interfacial water evaporation systems is known to have a stronger photothermal conversion performance than suspended water evaporation systems due to their relatively strong ability to suppress overall heat loss. Natural polymer chitosan and gelatin can form a three-dimensional interpenetrating network (IPN) sponge to provide an interface for water evaporation due to strong hydrogen bonding and electrostatic attraction interaction. However, the lack of effective light absorption, the intrinsic short lifetime, and the poor photothermal conversion greatly compromise their steam generation performance. Here, we fabricated a chitosan/gelatin-based IPN sponge incorporated with melanin-coated titania hollow nanospheres (CG@MPT-h) as a solar thermal converter, which is designed to exhibit a unique cavity structure and vertical channels. The cavity structure of melanin-coated titania acts as a solar thermal transducer, while the chitosan/gelatin-based IPN sponge acts as a single-pass water pump. A water hyacinth-inspired evaporation system shows outstanding steam generation performance, and the highest steam generation rate was 3.17 kg m −2 h −1 under a 2.5 sun illumination because of the cavity enhancement effect, far above TiO 2 particles and reported photo-thermal conversion materials. More importantly, the embedding of MPT-h nanoparticles in the IPN sponge effectively inhibits the growth of bacteria in the vertical channels, resulting in an antibacterial solar-driven water evaporator. This advanced sponge provides a cost-effective and practical sustainable energy technique for solar-driven wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Construction of a Three-Dimensional Interpenetrating Network Sponge for High-Efficiency and Cavity-Enhanced Solar-Driven Wastewater Treatment

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Solidification heat has been incorporated into the model by using modified relationships between enthalpy and temperature, given by Equations (1) and (2). In these equations, C p-sol is the specific heat capacity of the solid, C pslu is the specific heat capacity of the semisolid slurry, H S is the enthalpy at the solidus temperature, T slu is the slurry temperature, and T S is the solidus temperature.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In recent times, one of the methods of solid freeform fabrication (SFF), for production of metallic components, involves the deposition of semi-solid metal (SSM) slurry layers, one on top of another to build a 3-dimensional component [1,2]. Apart from combining the usual advantages of SFF (no requirement of hard tooling, amenability to changes in component design, etc.)…”

Section: Introductionmentioning

confidence: 99%

Solid freeform fabrication of aluminum alloy components: Numerical simulations

Vijh

Gokhale

Mishra

et al. 2009

Trans Indian Inst Met

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A heat transfer model has been developed to simulate the evolution of temperature during semi-solid metal (SSM) solid freeform fabrication (SFF) process. The governing equations were solved numerically using finite difference method. Deposition of simple cubic components of A356 (Al-7%Si-0.45%Mg) aluminum alloy have been simulated. The effect of process parameters such as deposition pattern, deposition velocity, slurry cross-section and slurry temperature on the transient temperature distribution in these components have been studied. Out of the three deposition patterns studied, i.e. rotating, alternating and unidirectional, the alternating pattern enabled depositing larger interfacefree components. Increasing the slurry flow rate resulted in the deposition of larger interface-free components.

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“…The pronounced shear-thinning characteristic of semi-solid metals with a globular microstructure enabling the production of three-dimensional structures due to a low viscosity during extrusion and a dimensional stability of the deposited material [7]. Initial investigations in the field of semi-solid AM have been done in respect to the processing of low melting lead alloys, showing the general feasibility of this approach [8,9,10]. In the following, the semi-solid extrusion of magnesium alloy wires on a modified FDM-printer was discussed by Lima et al [11].…”

Section: Introductionmentioning

confidence: 99%

Development of a new method utilizing semi-solid aluminum wires for extrusion based additive manufacturing

NEZIC

2023

Materials Research Proceedings

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Abstract. In the field of additive manufacturing (AM) technologies, the development of metal-based extrusion processes constitutes a significant industrial trend in the recent years. Respective processes are differentiated into powder bed, powder-fed and wire-fed depending on the used feedstock. Among those, powder-fed AM represents the most widely used approach, despite its physical limitations leading to intense thermal gradients and an uncontrollable defective microstructure of produced parts. In this context, extrusion-based AM using a wire semi-finished product in the semi-solid state offers a novel alternative for the direct processing of metallic alloys, avoiding the limitations mentioned. For this reason, a new method for consecutive extrusion of semi-solid AlSiMg aluminum wires has been developed at the Institute for Metal Forming (IFU, Stuttgart, Germany), particularly investigating the influence of the material´s microstructure on the process result. By modifying microstructure via heat treatment, a specific modification of the rheological material behavior can be achieved in terms of a pronounced shear-thinning characteristic, thus systematically affecting extrusion and deposition. First, an experimental setup for continuously extruding semi-sold aluminum wires was realized. Subsequently, experimental investigations were carried out on the extrusion of aluminum wires prepared via the strain induced melt activated (SIMA) process as well as untreated aluminum wires, using a conductively heated printhead concept. The objective was to determine process parameters necessary for successful extrusion and deposition of the modified aluminum material as well as the final proof of concept regarding a specific transformation of the material´s microstructure during the extrusion process.

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Untitled

Cited by 32 publications

References 4 publications

Construction of a Three-Dimensional Interpenetrating Network Sponge for High-Efficiency and Cavity-Enhanced Solar-Driven Wastewater Treatment

Construction of a Three-Dimensional Interpenetrating Network Sponge for High-Efficiency and Cavity-Enhanced Solar-Driven Wastewater Treatment

Solid freeform fabrication of aluminum alloy components: Numerical simulations

Development of a new method utilizing semi-solid aluminum wires for extrusion based additive manufacturing

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