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Modelling of material removal due to sliding wear caused by bulk material

Yan, Y. (author), Helmons, R.L.J. (author), Carr, Michael (author), Wheeler, Craig (author), Schott, D.L. (author)

A convex pattern surface has been proposed and optimized to reduce sliding wear of bulk handling equipment by adjusting the flow behaviour of bulk material. This study aims at modelling the surface deformation of the convex pattern sample to investigate how effectively the sample reduces sliding wear. Archard wear model and a deformable...

journal article 2023

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A laboratory study on the behavior of estuarine sediment flocculation as function of salinity, EPS and living algae

Deng, Z. (author), He, Qing (author), Manning, Andrew J. (author), Chassagne, C. (author)

The interactions between organic and inorganic particles in the context of flocculation is an on-going topic of research. Most current researches do not distinguish between the effects of EPS (produced by microorganisms) and living microorganisms (like algae). In this study, the effect of salinity, EPS and living algae on sediment...

journal article 2023

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The Influence of Particle Size on Sliding Wear of a Convex Pattern Surface

Yan, Y. (author), Helmons, R.L.J. (author), Schott, D.L. (author)

Sliding wear of bulk handling equipment (e.g., shovel bucket, mill and transfer chute) can be dramatically reduced by using a convex pattern surface compared to a flat surface, by adjusting the flow behavior of particles moving along the convex pattern surface. To study the effect of particle size relative to the dimensions of the convex pattern...

journal article 2022

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Supervised machine learning in microfluidic impedance flow cytometry for improved particle size determination

de Bruijn, Douwe S. (author), ten Eikelder, Henricus R.A. (author), Papadimitriou, V. (author), Olthuis, Wouter (author), van den Berg, Albert (author)

The assessment of particle and cell size in electrical microfluidic flow cytometers has become common practice. Nevertheless, in flow cytometers with coplanar electrodes accurate determination of particle size is difficult, owing to the inhomogeneous electric field. Pre-defined signal templates and compensation methods have been introduced to...

journal article 2022

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Seasonal variation of floc population influenced by the presence of algae in the Changjiang (Yangtze River) Estuary

Deng, Z. (author), He, Qing (author), Chassagne, C. (author), Wang, Zhengbing (author)

The variation of the floc population in the Changjiang Estuary has been studied for both winter and summer season as a function of the presence of living (micro)algae. The influence of algae has been characterized through the use of the chlorophyll-a concentration to suspended sediment concentration (CC/SSC) ratio. Two whole tidal cycle...

journal article 2021

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Rheology and yielding transitions in mixed kaolinite/bentonite suspensions

Shakeel, A. (author), Kirichek, Alex (author), Chassagne, C. (author)

Kaolinite suspensions are known to have quite fast settling behaviour and Newtonian character, particularly at low concentrations, due to the non-swelling nature of their constitutive particles. On the other hand, bentonite is known for its swelling and interacting nature, which leads to the formation of a network structure, even at low...

journal article 2021

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Possible application of Extra-Polymeric Substances (EPS) for enhancement of water-solid separation in laboratory bench scale Dissolved Air Flotation system (DAF)

Gardella, Giorgio (author)

Dissolved air flotation (DAF) is a water treatment technology meant for the separation of suspended particles from the water. Since the fifties of the XIX century, it has gained an important role in many sectors of water treatment applications. In general, the flux variability, the small space requirement, and the limited energy consumption...

student report 2020

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Improved performance of Differential Mobility Analyzers with 3D-printed flow straighteners

Loizidis, C. (author), Costi, M. (author), Lekaki, N. (author), Bezantakos, S. (author), Biskos, G. (author)

The Differential Mobility Analyzer (DMA) is currently the most effective instrument for sizing sub-micrometer aerosol particles. An important requirement to ensure good performance in terms of sizing accuracy and resolution is that the flow field remains laminar and undisturbed along its classification zone. To achieve that, a flow straightener ...

journal article 2020

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Green synthesis of ultrapure La(OH)₃ nanoparticles by one-step method through spark ablation and electrospinning and its application to phosphate removal

Li, Shiyang (author), Huang, Xiangfeng (author), Wan, Zhengyu (author), Liu, Jia (author), Lu, Lijun (author), Peng, Kaiming (author), Schmidt-Ott, A. (author), Bhattarai, Rabin (author)

La(OH)₃ metal engineered nanoparticles (MENPs) are efficient phosphate binders; however, complex synthesis procedures and purity as well as agglomeration issues impede their development and practical applications. Herein, a green and a one-step method in combination with the spark ablation aerosol technology and electrospinning is...

journal article 2020

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Influence of particle size distribution on anaerobic degradation of phenol and analysis of methanogenic microbial community

Wang, Jing (author), Wu, Benteng (author), Muñoz Sierra, Julian (author), He, Chunhua (author), Hu, Zhenhu (author), Wang, Wei (author)

Sludge morphology considerably affects the mechanism underlying microbial anaerobic degradation of phenol. Here, we assessed the phenol degradation rate, specific methanogenic activity, electron transport activity, coenzyme F₄₂₀ concentration, and microbial community structure of five phenol-degrading sludge of varying particle...

journal article 2020

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Flocculation of clay suspensions by anionic and cationic polyelectrolytes: A systematic analysis

Shakeel, A. (author), Safar, Z. (author), Ibanez Sanz, M.E. (author), van Paassen, L.A. (author), Chassagne, C. (author)

The characteristics of clayey suspensions, majorly composed of quartz microparticles, in the presence of anionic and cationic polyelectrolytes were investigated using different techniques. A wide range of clay concentrations was used, i.e., from 0.07 to 1000 g/L for different experimental techniques, based on the fact that the clay...

journal article 2020

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Investigating Critical Parameters of Dissolved Air Flotation(DAF) for Solid-Liquid Separation with Different Influents as part of the LOTUSHR Project

Guleria, Tavishi (author)

Many rapidly expanding cities around the world including India’s capital New Delhi face increasing potable water quality and health risks due contaminated open drains carrying the cities untreated wastewater into the adjoining river, which is also the city’s water source. To tackle this problem in a practical and holistic way, innovative...

master thesis 2019

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Unveiling the Structure Sensitivity for Direct Conversion of Syngas to C2-Oxygenates with a Multicomponent-Promoted Rh Catalyst

Sun, X. (author), Jansma, H. (author), Miyama, Toshihito (author), Sanjeewa Aluthge, Rasika Dasanayake (author), Shinmei, Kenichi (author), Yagihashi, Noritoshi (author), Nishiyama, Haruka (author), Osadchii, D. (author), van der Linden, B. (author), Makkee, M. (author)

Abstract: Mn and Li promoted Rh catalysts supported on SiO₂ with a thin TiO₂ layer were synthesized by stepwise incipient wetness impregnation approach. The thin TiO₂ layer on the surface of SiO₂ was proved to stabilize those small Rh nanoparticles and hinder their agglomeration. The reducibility of...

journal article 2019

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Effect of pore size distribution and particle size of porous metal oxides on phosphate adsorption capacity and kinetics

Suresh Kumar, P. (author), Korving, Leon (author), Keesman, Karel J. (author), van Loosdrecht, Mark C.M. (author), Witkamp, G.J. (author)

Phosphate is a vital nutrient but its presence in surface waters even at very low concentrations can lead to eutrophication. Adsorption is often suggested as a step for reducing phosphate down to very low concentrations. Porous metal oxides can be used as granular adsorbents that have a high surface area and hence a high adsorption capacity....

journal article 2019

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Qualification of an ultrasonic instrument for real-time monitoring of size and concentration of nanoparticles during liquid phase bottom-up synthesis

van Groenestijn, Gert Jan (author), Meulendijks, Nicole (author), van Ee, Renz (author), Volker, Arno (author), van Neer, P.L.M.J. (author), Buskens, Pascal (author), Julien, Cédric (author), Verheijen, Marcel (author)

Both in design and production of nanoparticles and nanocomposites it is of vital importance to have information about their size and concentration. During the formation of nanoparticles, real-time monitoring of particle size and concentration during bottom-up synthesis in liquids allows for a detailed study of nucleation and growth. This...

journal article 2018

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Characterization of aerosols from RDD surrogate compounds produced by fast thermal transients

Di Lemma, F.G. (author), Colle, Jean Yves (author), Ernstberger, Markus (author), Konings, R. (author)

Experimental tests have been performed to characterize the aerosols representative of radiological dispersion devices (RDDs, a.k.a. "dirty bombs") by applying to chosen surrogate compound rapid high temperature transients, vaporizing the sample and forming aerosols mainly by rapid cooling of the vapour. The materials, which were tested in...

journal article 2016

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Are stirring and sonication pre-dispersion methods equivalent for in vitro toxicology evaluation of SiC and TiC?

Mejia, J. (author), Valembois, V. (author), Piret, J.P. (author), Tichelaar, F. (author), Van Huis, M. (author), Masereel, B. (author), Toussaint, O. (author), Delhalle, J. (author), Mekhalif, Z. (author), Lucas, S. (author)

The evolution of the particle size distribution and the surface composition of silicon carbide and titanium carbide nanoparticle (NP) dispersions were studied. The pre-dispersions were prepared using two commonly used protocols for dispersion: stirring and sonication. Two dispersants were investigated (water and Pluronic F108 1 %) at two stages:...

journal article 2012

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Fractal disperse hydrogen sorption kinetics in spark discharge generated Mg/NbOx and Mg/Pd nanocomposites

Anastasopol, A. (author), Pfeiffer, T.V. (author), Schmidt-Ott, A. (author), Mulder, F.M. (author), Eijt, S.W.H. (author)

Isothermal hydrogen desorption of spark discharge generated Mg/NbOx and Mg/Pd metal hydride nanocomposites is consistently described by a kinetic model based on multiple reaction rates, in contrast to the Johnson-Mehl-Avrami-Kolmogorov [M. Avrami, J. Phys. Chem. 9, 177 (1941); W. A. Johnson and R. F. Mehl, Trans. Am. Inst. Min., Metal. Eng. 135,...

journal article 2011

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Thermal stability of gas phase magnesium nanoparticles

Krishnan, G. (author), Kooi, B.J. (author), Palasantzas, G. (author), Pivak, Y. (author), Dam, B. (author)

In this work we present a unique transmission electron microscopy study of the thermal stability of gas phase synthesized Mg nanoparticles, which have attracted strong interest as high capacity hydrogen storage materials. Indeed, Mg nanoparticles with a MgO shell ( ? 3?nm thick) annealed at 300?°C show evaporation, void formation, and void...

journal article 2010

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On the influence of the sputtering in determining the resolution of a scanning ion microscope

Castaldo, V. (author), Hagen, C.W. (author), Kruit, P. (author), Van Veldhoven, E. (author), Maas, D. (author)

The determination of the quality of an imaging system is not an easy task for, in general, at least three parameters, strictly interdependent, concur in defining it: resolution, contrast, and signal-to-noise ratio. The definition of resolution itself in scanning microscopy is elusive and the case of scanning ion microscopy is complicated by the...

journal article 2009