The Experts below are selected from a list of 5523 Experts worldwide ranked by ideXlab platform
J Jaap C Schouten - One of the best experts on this subject based on the ideXlab platform.
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residence time distribution in a single phase rotor stator Spinning Disk reactor
Aiche Journal, 2013Co-Authors: F. Visscher, John Van Der Schaaf, Jos De Hullu, Mart H J M De Croon, J Jaap C SchoutenAbstract:A reactor model for the single-phase rotor–stator Spinning Disk reactor based on residence time distribution measurements is described. For the experimental validation of the model, the axial clearance between the rotor and both stators is varied from 1.0 × 10−3 to 3.0 × 10−3 m, the rotational Disk speed is varied from 50 to 2000 RPM, and the volumetric flow rate is varied from 7.5 × 10−6 to 22.5 × 10−6 m3 s−1. Tracer injection experiments show that the residence time distribution can be described by a plug flow model in combination with 2–3 ideally stirred tanks-in-series. The resulting reactor model is explained with the effect of turbulence, the formation of Von Karman and Bodewadt boundary layers, and the effect of the volumetric flow rate. © 2013 American Institute of Chemical Engineers AIChE J, 59: 2686–2693, 2013
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mass transfer in a rotor stator Spinning disc reactor with co feeding of gas and liquid
Industrial & Engineering Chemistry Research, 2010Co-Authors: Marco M Meeuwse, John Van Der Schaaf, J Jaap C SchoutenAbstract:This paper presents a new type of Spinning Disk reactor configuration for gas−liquid operations. It combines the features of a classical Spinning Disk with a liquid film on the rotor [e.g., Aoune, A.; Ramshaw, C. Int. J. Heat Mass Transfer 1999, 42, 2543−2556] and those of a rotor−stator Spinning Disk unit with a single gas inlet in the bottom stator [Meeuwse, M.; van der Schaaf, J.; Kuster, B. F. M.; Schouten, J. C. Chem. Eng. Sci. 2010, 65 (1), 466−471]. In this new configuration, gas and liquid are cofed through an inlet in the top stator. It is shown that gas−liquid mass transfer mainly takes place in the dispersed region between the rotor and the bottom stator. kGLaGLVR in this region is up to a factor of 6 larger than in the region with the liquid film on the rotor. Simulation of gas desorption from a saturated liquid shows that the gas−liquid mass transfer in this cofed configuration is considerably improved in comparison to the separate reactors, at similar operating conditions. The new reactor ha...
Ilan Davis - One of the best experts on this subject based on the ideXlab platform.
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wavefront sensorless adaptive optics with a laser free Spinning Disk confocal microscope
Journal of Microscopy, 2020Co-Authors: Syed Asad Hussain, Toshiki Kubo, Nicholas Hall, Dalia Gala, Karen M Hampson, Richard M Parton, Michael A Phillips, Matthew Wincott, Katsumasa Fujita, Ilan DavisAbstract:Adaptive optics is being applied widely to a range of microscopies in order to improve imaging quality in the presence of specimen-induced aberrations. We present here the first implementation of wavefront-sensorless adaptive optics for a laser-free, aperture correlation, Spinning Disk microscope. This widefield method provides confocal-like optical sectioning through use of a patterned Disk in the illumination and detection paths. Like other high-resolution microscopes, its operation is compromised by aberrations due to refractive index mismatch and variations within the specimen. Correction of such aberrations shows improved signal level, contrast and resolution.
Giorgio Vilardi - One of the best experts on this subject based on the ideXlab platform.
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intensified water denitrification by means of a Spinning Disk reactor and stirred tank in series kinetic modelling and computational fluid dynamics
Journal of water process engineering, 2020Co-Authors: Giorgio Vilardi, Luca Di Palma, Marco Stoller, Benedetta De Caprariis, Nicola VerdoneAbstract:Abstract The aim of this work was to investigate the performances of a Spinning Disk reactor for the removal of nitrate from aqueous solutions, by using iron nanoparticles as reducing agent. The influence of three operating parameters, i.e. rotational velocity, feed injection point position and recirculation flow-rate was investigated through evaluating the nitrate reduction efficiency and kinetics. Increasing the rotational velocity led to a better nitrate reduction efficiency and faster kinetics. The optimal rotational velocity was 147 rad/s, whereas the optimal feed injection point distance from Disk centre and recirculation flow-rate were 3 cm and 250 ml/min, respectively. The data were compared with those reported in literature and obtained by classical batch reactor and clearly demonstrated the better performances obtained by this intensified equipment. Finally, a mass transfer based kinetic model was proposed, and a computational fluid dynamic model was implemented to simulate the fluid dynamics of the rotating liquid film.
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metallic iron nanoparticles intensified production by Spinning Disk reactor optimization and fluid dynamics modelling
Chemical Engineering and Processing, 2019Co-Authors: Giorgio Vilardi, Luca Di Palma, Kamelia Boodhoo, Marco Stoller, Nicola VerdoneAbstract:Abstract The aim of this work was to investigate the optimization of iron nanoparticles production by Spinning Disk reactor. The influence of the two main operating parameters, i.e. rotational velocity and feed injection point position was investigated through evaluating the particle size distribution, the X-Ray powder diffraction spectra and metallic iron percentage production. Results showed that increasing both rotational velocity and the distance of reagents injection feed points from the Disk centre led, to the production of metallic iron nanoparticles characterized by lower mean size. In particular, the optimal rotational velocity was found to be 1400 rpm whereas the optimal distance of injection feed point from Disk centre was found to be 3.5 cm. According to these operating parameter values it was possible to obtain monodisperse nanoparticles, characterized by a mean size of 28 ± 2.1 nm and a production in the range 0.24–24 kg/day depending on the initial Fe(II) concentration. The results were then interpreted in light of three fluid dynamics models able to simulate the rotating thin liquid film on the surface of the Spinning Disk reactor. The applicability of Nusselt model was also investigated and discussed.
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Spinning Disk Reactor Technology in Photocatalysis: Nanostructured Catalysts Intensified Production and Applications
Nanophotocatalysis and Environmental Applications, 2019Co-Authors: Javier Miguel Ochando-pulido, Antonio Martínez-férez, Luca Di Palma, Marco Stoller, Giorgio VilardiAbstract:The use of photocatalysis in environmental remediation processes has become more important in the last decade, mainly due to the notable efforts made by researchers in this field. The photocatalytic process requires a semiconductor material (photocatalyst), usually a metal oxide, which can be activated through the energy transported by ultraviolet light or visible light waves. The activated photocatalyst generates active compounds, such as hydroxyl radicals and superoxide ion, able to degrade very recalcitrant and non-biodegradable compounds present on the catalyst surface or in the liquid medium. The efficiency of the pollutant removal process is affected by various factors related to the employed photocatalyst, such as mean dimension, size distribution, physical structure and energy required for the activation. The photocatalyst characteristics are strongly dependent on the production process, and several researchers have developed new intensified production processes that require particular equipment. In the present chapter, the production of nanostructured catalysts in a continuous Spinning Disk Reactor is discussed. The main features of Spinning Disk Reactor technology are reported and analysed, i.e. rotational velocity, Disk diameter, Disk surface material and roughness, focusing on the production of nanoparticles to be used in the photocatalytic application, in view of the process intensification of photocatalysis application in the field of environmental remediation. A general overview about process intensification and its application to chemical engineering is presented, and the advantages offered by Spinning Disk Reactor technology, in terms of an increase of process efficiency due to the misinformation of operative conditions in reactors, are illustrated. Basing on the Spinning Disk Reactor characteristics and operative conditions, nanoparticle production by Spinning Disk Reactor compared to conventional technologies and the current application of this technology to selected nanoparticles (titania, magnetite, MgO and hydroxyapatite), synthesis is discussed. Spinning Disk Reactor technology allows to produce active semiconductor particles, characterized by a mean size significantly below 100 nm and with a narrow unimodal distribution, improving the quality of these products in comparison with those produced through conventional processes and equipment. Finally, the application of vertical and horizontal Spinning Disk Reactor configuration to the degradation of refractory compounds by photocatalysis is reviewed, aiming at evaluating process efficiency and the produced nanoparticle characteristics, to assess the key parameters and the limiting factors of the technology.
Hiroshi Sasaki - One of the best experts on this subject based on the ideXlab platform.
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multiplexed 3d super resolution imaging of whole cells using Spinning Disk confocal microscopy and dna paint
Nature Communications, 2017Co-Authors: Florian Schueder, Juanita Laragutierrez, Brian J Beliveau, Sinem K Saka, Hiroshi SasakiAbstract:Single-molecule localization microscopy (SMLM) can visualize biological targets on the nanoscale, but complex hardware is required to perform SMLM in thick samples. Here, we combine 3D DNA points accumulation for imaging in nanoscale topography (DNA-PAINT) with Spinning Disk confocal (SDC) hardware to overcome this limitation. We assay our achievable resolution with two- and three-dimensional DNA origami structures and demonstrate the general applicability by imaging a large variety of cellular targets including proteins, DNA and RNA deep in cells. We achieve multiplexed 3D super-resolution imaging at sample depths up to ~10 µm with up to 20 nm planar and 80 nm axial resolution, now enabling DNA-based super-resolution microscopy in whole cells using standard instrumentation.
Syed Asad Hussain - One of the best experts on this subject based on the ideXlab platform.
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wavefront sensorless adaptive optics with a laser free Spinning Disk confocal microscope
Journal of Microscopy, 2020Co-Authors: Syed Asad Hussain, Toshiki Kubo, Nicholas Hall, Dalia Gala, Karen M Hampson, Richard M Parton, Michael A Phillips, Matthew Wincott, Katsumasa Fujita, Ilan DavisAbstract:Adaptive optics is being applied widely to a range of microscopies in order to improve imaging quality in the presence of specimen-induced aberrations. We present here the first implementation of wavefront-sensorless adaptive optics for a laser-free, aperture correlation, Spinning Disk microscope. This widefield method provides confocal-like optical sectioning through use of a patterned Disk in the illumination and detection paths. Like other high-resolution microscopes, its operation is compromised by aberrations due to refractive index mismatch and variations within the specimen. Correction of such aberrations shows improved signal level, contrast and resolution.
