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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Van Santen, Rutger
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2011DFT studies of hydrogen storage properties of Mg0.75Ti0.25citations
- 2010Nanostructures of Mg0.65Ti0.35Dx studied with X-ray diffraction, neutron diffraction and magic-angle-spinning 2H NMR spectroscopycitations
- 2010Reactivity and selectivity of heterogenized homogeneous catalysts: insights from molecular simulationscitations
- 2009Nanorod calculations on body-centered cubic iron : a method for estimation of size-dependent surface energies of metal nanocrystalscitations
- 2008CO Dissociation on the Ru(1121) Surfacecitations
- 2007Enantioselectivity of immobilized Mn-salen complexes : a computational studycitations
- 2007An efficient hybrid, nanostructured, epoxidation catalyst: titanium silsesquioxane-polystyrene copolymer supported on SBA-15citations
- 2006Characterization and reactivity of Ga+ and GaO+ cations in zeolite ZSM-5citations
- 2003Characterization of Ga/HZSM-5 and Ga/HMOR synthesized by chemical vapor deposition of trimethylgalliumcitations
- 2002Synthesis and characterization of microporous Fe-Si-O materials with tailored iron content from silsesquioxane precursorscitations
- 2002PEG-mediated silica pore formation monitored in situ by USAXS and SAXS: Systems with properties resembling diatomaceous silicacitations
- 2002Synthesis and characterisation of microporous bimetallic Fe-Cr-Si-O materials derived from silsesquioxane precursorscitations
- 2001Microporous Mg-Si-O and Al-Si-O Materials Derived from Metal Silsesquioxanescitations
- 2001Synthesis, structural characterization, and transmetalation reactions of a tetranuclear magnesium silsesquioxane complexcitations
- 2001Intermediate species and reaction pathways for the oxidation of ammonia on powdered catalystscitations
- 2000Characterization of the microporosity of chromia- and titania-pillared montmorillonites differing in pillar density. I. Adsorption of nitrogencitations
Places of action
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article
PEG-mediated silica pore formation monitored in situ by USAXS and SAXS: Systems with properties resembling diatomaceous silica
Abstract
Poly(ethylene glycol) (PEG) was employed as templating agent for the synthesis of porous silica. The effect of PEG chain length and of the PFG/silica ratio on textural properties (fractality, pore size, and pore distribution) were investigated by monitoring the development of silica-PEG intermediates using ultrasmall and small-angle X-ray scattering analysis with high-brilliance synchrotron radiation to obtain sufficient radiation intensity for dynamic results at the subminute scale. We show that even a simple structure-directing polymer, such as PEG, results in silicas with pores of diameters spanning a range of less than 2 nm up to 20 nm, depending on polymer molecule length and polymer/silica ratio. Flocculation may well be the most important distinction between silicas prepared with small and large PEG. In this view, small PEG600 gets encapsulated by silica and forms pools within the silica framework, whereas large PEG20,000 is entangled in a mass of silica spheres, making enclosure by silica or phase separation impossible. Both polymer chain length and the polymer/silica ratio govern the relative importance of flocculation, phase separation, and hydrophobic silica-PEG interactions steering the silica polymerization. Increase in hydrophobicity results in a larger surface area and a more uniform pore size distribution, art effect confirmed by scanning electron microscopy (SEM) and observations of physical adsorption of nitrogen gas (BET). Polymers, such as PEG, may well be an inexpensive and versatile substitute and model for polypeptides known as structure-directing agents in biomineralization if silicas resembling natural ones, notably the ones present in such a huge diversity in algae of the group of diatoms, are the focus of scientific attention, e.g., for biomimicking with a view on industrial applications