The IWA International Conference on Particle Separation (PS2007), Toulouse, France, 9-12 July 2007

Alammar T.

Araujo V. D.

Ayyub A.

Branco L. C.

Brus L. E.

Burroughs P.

Cao X.

Dubois P.

Elidrissi B.

Goharshadi K.

Guillou N.

Hamdy A. S.

Han L.

Handy S. T.

Hou X.

Ji P.

Li Z.-X.

Manickam S.

Marina O. A.

Miao J.-J.

Miao S.

Morshed A. H.

Noei H.

Ott L. S.

Palmqvist A. E. C.

Pan C.

Reddy B. M.

Rogers N. J.

Salvi A. M.

Shyu J. S.

Spanier J.

Stepnowski P.

Sun C.

Sun W. C.

Tana

Tsunekawa S.

Tsuzuki T.

Vaqueiro P.

Verma A.

Vermal A.

Wang G.

Wang W.

Wang Y.

Welton T.

Wittmar A.

Wolf D.

Wu Z.

Yabe S.

Yan B.

Yuejuan W.

Zaki M. I.

Zhang F.

Zhang T. S.

Zhou K.

$CeO_{2}$ nanoparticles were synthesized via a one-step ultrasound synthesis in different kinds of ionic liquids based on bis(trifluoromethanesulfonylamide, $[Tf_{2}N]^{−}$, in combination with various cations including 1-butyl-3-methylimidazolium $([C_{4}mim]^{+})$, 1-ethyl-2,3-dimethylimidazolium $([Edimim]^{+}), butyl-pyridinium([Py_{4}]^{+})$, 1-butyl-1-methyl-pyrrolidinium $([Pyrr_{14}]^{+})$, and 2-hydroxyethyl-trimethylammonium $([N_{1112}OH]^{+})$. Depending on synthetic parameters, such as ionic liquid, Ce(IV) precursor, heating method, and precipitator, formed ceria exhibits different morphologies, varying from nanospheres, nanorods, nanoribbons, and nanoflowers. The morphology, crystallinity, and chemical composition of the obtained materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, and $N2$ adsorption. The structural and electronic properties of the as-prepared $CeO_{2}$ samples were probed by CO adsorption using IR spectroscopy under ultrahigh vacuum conditions. The catalytic activities of $CeO_{2}$ nanoparticles were investigated in the oxidation of CO. $CeO_{2}$ nanospheres obtained sonochemically in $[C_{4}mim][Tf_{2}N]$ exhibit the best performance for low-temperature CO oxidation. The superior catalytic performance of this material can be related to its mesoporous structure, small particle size, large surface area, and high number of surface oxygen vacancy sites

Alammar, Tarek

Noei, Heshmat

Wang, Yuemin

Grünert, Wolfgang

Mudring, Anja Verena

DESY

Ionic Liquid-Assisted Sonochemical Preparation of $CeO_{2}$ Nanoparticles for CO Oxidation

Tarek Alammar

Heshmat Noei

Yuemin Wang

Wolfgang Grünert

Anja-Verena Mudring

Crossref

ACS Sustainable Chemistry & Engineering

Ionic Liquid-Assisted Sonochemical Preparation of CeO<sub>2</sub>Nanoparticles for CO Oxidation

CeO2 nanoparticles were synthesized via a one-step ultrasound synthesis in different kinds of ionic liquids based on bis(trifluoromethanesulfonylamide, [Tf2N]−, in combination with various cations including 1-butyl-3-methylimidazolium ([C4mim]+), 1-ethyl-2,3-dimethylimidazolium ([Edimim]+), butyl-pyridinium([Py4]+), 1-butyl-1-methyl-pyrrolidinium ([Pyrr14]+), and 2-hydroxyethyl-trimethylammonium ([N1112OH]+). Depending on synthetic parameters, such as ionic liquid, Ce(IV) precursor, heating method, and precipitator, formed ceria exhibits different morphologies, varying from nanospheres, nanorods, nanoribbons, and nanoflowers. The morphology, crystallinity, and chemical composition of the obtained materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX), Raman spectroscopy, and N2 adsorption. The structural and electronic properties of the as-prepared CeO2 samples were probed by CO adsorption using IR spectroscopy under ultrahigh vacuum conditions. The catalytic activities of CeO2 nanoparticles were investigated in the oxidation of CO. CeO2 nanospheres obtained sonochemically in [C4mim][Tf2N] exhibit the best performance for low-temperature CO oxidation. The superior catalytic performance of this material can be related to its mesoporous structure, small particle size, large surface area, and high number of surface oxygen vacancy sites.Reprinted with permission from ACS Sustainable Chem. Eng., 2015, 3 (1), pp 42–54. Copyright 2015 American Chemical Society.</p

Grunert, Wolfgang

Mudring, Anja

Digital Repository @ Iowa State University (ISU)

Ionic Liquid-Assisted Sonochemical Preparation of CeO2 Nanoparticles for CO Oxidation

Xiao, F

Lam, KM

Li, XY

HKU Scholars Hub

Investigation of the hydrodynamic behaviour of particles and aggregates by particle image velocimetry (PIV)

Proceedings of the International Symposium on Sustainable and Safe Water Supplies, Hong Kong, China, 15-17 January 2007.An advanced fluid visualisation technique, particle image velocimetry, was employed to investigate the hydrodynamic properties of particles and aggregates. The experiments were conducted in a settling column filled with a suspension of fluorescent polymeric beads as flow tracers. A thin vertical section of the settling column was illuminated by a laser sheet, while the motions of particles were recorded by a high speed CCD camera. Large solid spheres, flocs of latex microspheres and aggregates of marine diatoms were characterised for their hydrodynamic properties. The trajectories of the tracer particles were tracked when a large particle or aggregate settled through the suspension of the tracers, which gave the streamlines surrounding the falling object. The streamlines demonstrate directly the curvilinear feature of the interaction between approaching particles. However, the available curvilinear model underestimates the collision frequency function of particles by one order of magnitude or two. The collision potentials of the flocs and aggregates are more than an order of magnitude greater than the similar-sized solid spheres. Algal aggregates appear to be highly porous and fractal with a fluid collection efficiency of 10-40%, which would significantly enhance the flocculation between particles and the mass transfer into the aggregates. © IWA Publishing 2007.postprin

Water Science & Technology Water Supply

DESY Publication Database

https://dr.lib.iastate.edu/handle/20.500.12876/55538

Investigation of the hydrodynamic behaviour of particles and aggregates by particle image velocimetry (PIV)

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Digital Repository @ Iowa State University (ISU)

HKU Scholars Hub

HKU Scholars Hub

DESY Publication Database