Journal ArticleDOI
Preparation and characterization of functionalized precipitated silica SYLOID® 244 using ionic liquids as modifiers
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In this article, the chemical modification of SYLOID® 244 (Grace) precipitated silica using ionic liquids was performed and a comprehensive physicochemical and dispersive evaluation was performed.Abstract:
Studies were performed on the chemical modification of SYLOID® 244 (Grace) precipitated silica using ionic liquids. The unmodified and ionic-liquid-functionalized silica were subjected to a comprehensive physicochemical and dispersive evaluation. Particle size, polydispersity and specific surface area (BET) and porous structure were examined. Moreover, stability of the colloids obtained was evaluated by estimation of isoelectric points. The extent of modification and its type were defined using fourier transform infrared spectroscopy and 29Si-cross-polarization/magic angle spinning/nuclear magnetic resonance techniques.
The modification was not observed to deteriorate the dispersive properties of the silica. The silicas obtained exhibited a restricted tendency to form larger accumulations of particles, i.e. aggregates and agglomerates. Moreover, application of ionic liquids with a heptyloxymethyl or octyloxymethyl substituent resulted in complete hydrophobization of the silica surface. Tested powders manifested the highest stability within a pH range of 10–12. Copyright © 2004 John Wiley & Sons, Ltd.read more
Citations
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Comparison of mesoporous silicon and non-ordered mesoporous silica materials as drug carriers for itraconazole.
TL;DR: The physicochemical properties of the particles and the loading procedure were shown to have an effect on the drug loading efficiency and drug release kinetics and this was not the case with the loaded mesoporous silicon particles due to the almost complete chemical degradation of ITZ after storage.
Journal ArticleDOI
Ionic Liquids as Environmentally Friendly Solvents in Macromolecules Chemistry and Technology, Part II
Shadpour Mallakpour,Zahra Rafiee +1 more
TL;DR: An extensive overview of use of ionic liquids in polymers chemistry and technology can be found in this paper, where the authors provide a detailed overview of the use of ILs in various chemistry processes.
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Synergistic role of self-emulsifying lipids and nanostructured porous silica particles in optimizing the oral delivery of lovastatin
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Preparation of Ultrafine Pigment Dispersion and Investigation of its Adsorption Performance on Cationized Flax Substrate
Longyun Hao,Yuqing Cai,Rui Wang +2 more
TL;DR: In this article, an ultrafine pigment dispersion was prepared using sodium methylene dinaphthalene disulphonate (NNO) as the dispersant in conjunction with micro-jet milling.
Journal ArticleDOI
Influence of structural organization of silicas on interfacial phenomena
Vladimir M. Gun’ko,Vladimir V. Turov,Vladimir I. Zarko,E.M. Pakhlov,Barbara Charmas,Jadwiga Skubiszewska-Zięba +5 more
TL;DR: In this paper, initial and treated silicas of different origin, such as fumed and precipitated silicas and silica gel, were studied using infrared spectroscopy, DSC, NMR, and adsorption methods.
References
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Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
TL;DR: In this paper, the synthesis of mesoporous inorganic solids from calcination of aluminosilicate gels in the presence of surfactants is described, in which the silicate material forms inorganic walls between ordered surfactant micelles.
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Ionic Liquids-New "Solutions" for Transition Metal Catalysis.
Peter Wasserscheid,Wilhelm Keim +1 more
TL;DR: There are indications that switching from a normal organic solvent to an ionic liquid can lead to novel and unusual chemical reactivity, which opens up a wide field for future investigations into this new class of solvents in catalytic applications.
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Ionic liquid (molten salt) phase organometallic catalysis.
TL;DR: The advent of water-soluble organometallic complexes, especially those based on sulfonated phosphorus-containing ligands, has enabled various biphasic catalytic reactions to be conducted on an industrial scale and might combine the advantages of both homogeneous and heterogeneous catalysis.
Journal ArticleDOI
Catalytic reactions in ionic liquids
TL;DR: The use of ionic liquids as novel reaction media may offer a convenient solution to both the solvent emission and the catalyst recycling problem, as well as in supercritical carbon dioxide.