Pro2Tech | TU Delft Process & Product Technology Institute

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Pro2Tech | Solids & Fluid Mechanics

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TU Delft Process & Product Technology Institute (Pro2Tech) is the research incubator for process and product technologies at TU Delft. It reinforces the coherence and collaboration between process technology researchers working at TU Delft and our academic and industrial partners worldwide.

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Buckling of a monolayer of platelike particles trapped at a fluid-fluid interface

Two-dimensional nanomaterials, such as graphene and graphene oxide, are platelike particles with nanometric thickness. Understanding the behavior of these 2D nanoparticles at fluid interfaces is crucial for various applications. Corrugated films, produced by assembling nanosheets at the air-water interface, are used as high-performance electrode materials. However, the formation of these corrugated films through buckling instability remains poorly understood. In collaboration with Hugo Perrin and under the supervision of Lorenzo Botto, PhD candidate Suriya Prakash developed a novel experimental setup to study the buckling of monolayers of platelike particles at fluid-fluid interfaces. The results show that the models developed for spherical particles are not suitable for describing the behavior of platelike particles at fluid interfaces. To overcome this limitation, the team developed a mathematical model to explain the buckling behavior of these monolayers with platelike particles. This work has been published in Physical Review E . Abstract Particles trapped at a fluid-fluid interface by capillary forces can form a monolayer that jams and buckles when subject to uniaxial compression. Here we investigate experimentally the buckling mechanics of monolayers of millimeter-sized rigid plates trapped at a planar fluid-fluid interface subject to uniaxial compression in a Langmuir trough. We quantified the buckling wavelength and the associated force on the trough barriers as a function of the degree of compression. To explain the observed buckling wavelength and forces in the two-dimensional (2D) monolayer, we consider a simplified system composed of a linear chain of platelike particles. The chain system enables us to build a theoretical model which is then compared to the 2D monolayer data. Both the experiments and analytical model show that the wavelength of buckling of a monolayer of platelike particles is of the order of the particle size, a different scaling from the one usually reported for monolayers of spheres. A simple model of buckling surface pressure is also proposed, and an analysis of the effect of the bending rigidity resulting from a small overlap between nanosheet particles is presented. These results can be applied to the modeling of the interfacial rheology and buckling dynamics of interfacial layers of 2D nanomaterials. Suriya Senthil Kumar Lorenzo Botto Read the publication

Mechanochemical production of hydrogen carriers

Sodiumborohydride (NaBH4) is regarded as one of the options to store and transport hydrogen safely and at relatively high energy density. Large quantities of hydrogen gas can easily be released when the sodiumborohydride powder is dissolved in water and brought in contact with a catalyst. One of the bottlenecks hampering large scale application is the difficult regeneration of the spent fuel (sodiummetaborate) which remains after this hydroysis reaction. Mechanochemical conversion with magnesium or magnesiumhydride may offer a solution, but until now focus has always been on the chemical component of mechanochemistry. Together with his supervisors Johan Padding and Dingena Schott, PhD student Santiago Garrido Nuñez has performed for the first time a systematic study of the influence of various mechanical parameters (such as the rotational speed and amplitude of the milling jar, milling time, milling ball diameter, and filling level) on the chemical conversion, finding that a high yield of 90% may be achieved at reduced energy costs compared to previous literature results. Abstract In this study we investigate the mechanochemical regeneration of sodium borohydride (NaBH 4 ) from a system comprising hydrated sodium metaborate (NaBO 2 -4H 2 O) and magnesium hydride (MgH 2 ). We explore the individual and joint impact of key operational parameters (rotational speed, milling time, ball-to-powder ratio (BPR), and molar ratio) on the regeneration yield. Furthermore, a method for quantifying chemical conversion is introduced relying only on water and thus, offering environmental benefits. This approach additionally facilitates the production and storage of a “ready-to-use” NaBH 4 solution with minimal losses at room temperature. Notably, a yield of 90% is achieved, with a 20% reduction in rotational speed compared to prior literature. This research contributes to sustainable hydrogen storage and presents practical advancements in mechanochemical processes. Read the article Santiago Garrido Nuñez Dingena L. Schott Johan Padding
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