Ordered mesoporous silica
Application of a hybrid ordered mesoporous silica as sorbent for solid-phase multi-residue extraction of veterinary drugs in meat by ultra-high-performance liquid chromatography coupled to ion-trap tandem mass spectrometry
... 5 mL of MeOH, vortexed for 1 min and centrifuged at 5000 rpm for 10 min. The resultant supernatant was collected with the previous one, and then filtered under vacuum. This extract was purified by SPE. To prepare the SPE ...
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Polystyrene modified hybrid materials based on ordered mesoporous silica
... SBA-15 silica sample impregnated with free liquid STETMOS, disappears in all the ST hybrid materials (Figure ...the silica via Si-C bonds, evidencing a reduction of the organic incorporation yield for ...
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Ordered mesoporous silica functionalized with ß-cyclodextrin derivative for optical isomer separation of flavanones and flavanone glycosides by nano-liquid chromatography and capillary electrochromatography
... In this paper a novel chiral stationary phase (CSP) was prepared by the immobilization of a β-CD derivative (3,5-dimethylphenylcarbamoylated β-CD) onto the surface of amino-functionalized spherical ordered ...
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One pot synthesized functionalized mesoporous silica as a reversed phase sorbent for solid phase extraction of endocrine disrupting compounds in milks
... sense, ordered mesoporous silicas are promising materials because of their desirable characteristics: (a) highly ordered and size- controlled mesoporous structures, (b) extremely high surface ...
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Ethylene polymerization over supported MAO/(nBuCp)2ZrCl2 catalysts:Influence of support properties.
... of silica, silica-alumina and aluminophosphate supports calcined at different ...of silica calcined between 200- 600 ºC, show a sharp band at 3736 cm -1 assigned to isolated silanol groups (scheme 1; ...
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Capillary condensation, freezing, and melting in silica nanopores: A sorption isotherm and scanning calorimetry study on nitrogen in mesoporous SBA 15
... One can qualitatively distinguish between five regimes in the isotherm, presented in the following as a function of rising P : The initial steep increase is due to the formation of a strongly silica-bound first ...
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Soft ideals in ordered semigroups
... If α(z) ∩ α(v) = α(z), then α(z) ⊆ α(x), which is a contradiction by (2). Thus we get α(z) ∩ α(v) = α(v) and hence α(x) ⊇ α(v) = θ(u) ∩ α(v). In the rest of this section, we show that the soft quasi-ideals of an ...
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Current development and applications of ordered mesoporous silicas and other sol-gel silica-based materials in food sample preparation for xenobiotics analysis
... 12 procedure, since the overall particle size for the different sorbents can be very different, what imposes many influences, such as, mass diffusion and a drop in pressure of the extraction device. Moreover, the sample ...
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Immobilization strategies for laccase from Trametes versicolor on mesostructured silica materials and the application to the degradation of naphthalene
... method, wherein APTES and ABTMS were employed as amine precursors. The degree of organic functionalization was fixed at two levels: molar ratios of 1 and 10% referred to total silicon. In this way, four materials were ...
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Use of new silica fillers as additives for polymers used in packaging of fruit
... bulk silica in the S1 sample is ...the silica-biopolymer materials (Figure 4) exhibit similar morpho- ...S1 silica is shown in Figure 5 and has spherical or oval shaped particles, with a primary ...
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Hybrid zeolitic-mesostructured materials as supports of metallocene polymerization catalysts
... and ordered mesoporous materials, that is, more and stronger acid sites found in hybrid materials in com- parison with Al-MCM-41 at Si/Al molar ratios in the range ...
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Enhancement of Peroxidase Stability Against Oxidative Self Inactivation by Co immobilization with a Redox Active Protein in Mesoporous Silicon and Silica Microparticles
... HRP enzyme has found application in several diag- nostic applications in pharmaceutics and medicine, such as the detection of human immunodeficiency virus and cystic fibrosis [30]. Due to the inherent drawback of ...
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Generalizations of weighted means and OWA operators by using unimodal weighting vectors
... weighted ordered weighted averaging (WOWA) operators [2] and the semiuninorm-based ordered weighted averaging (SUOWA) operators [3] because both can be expressed through Choquet integrals with respect to ...
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Aggregating opinions in non uniform ordered qualitative scales
... Herrera and Mart´ınez [17, 18] introduce the 2-tuple linguistic model for aggregating linguistic information in the setting of uniform ordered qualitative scales. The authors identify each linguistic term of the ...
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Aplicación de materiales híbridos para la determinación electroquímica de metales pesados en aguas
... surfactant-templated silica films with immobilized 5-mercapto-1-methyl-tetrazole groups, in one step, and applied the resulting mesoporous organic–inorganic hybrid layer coated onto glassy carbon electrode ...
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Un meta-heurístico grasp para el problema de stock de corte ordenado
... The cutting stock problem (CSP) is a classic problem in the area of operations research. It can be defined as the problem of finding the best way of cutting ordered items from stock rolls of width W such that trim ...
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Rheological and mechanical properties of self-compacting concrete with the addition of nano-silica and microsilica
... concrete, silica fume is used, and more recently, nanomaterials with nano-silica as well; mainly, ...nano-silica, silica fume and binary mixtures of both, which satisfy the demands for high ...
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Byphenyl Hydrazone SiO2 Composite: Synthesis and Evaluation of a New Chemosensor System for the Detection of Cu2+
... the mesoporous silica by weak interactions such as hydrogen bonds that connect the ligand molecules with the wall of SBA-15 without produce chemical ...
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Mesoporous Silica Nanoparticles Decorated with Carbosilane Dendrons as New Non viral Oligonucleotide Delivery Carriers
... nanoparticles surface is supported by the chemical shifts of the hybrid material, which closely match those of the respective func- tional groups in the solution NMR spectrum of the free compound [ 40 ]. In general, the ...
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Enhanced ultrafiltration PES membranes doped with mesostructured functionalized silica particles
... mesostructured silica particles to the membrane composition brought about an increase of the porosity and an enhancement of the hydrophilicity at the same ...
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