Synthesis and characterization of biocatalytic γ-Fe2O3@SiO2 particles as recoverable bioreactors

Vaz, A.M.; Serrano-Ruiz, David; Laurenti, Marco; Alonso-Cristobal, Paulino; López-Cabarcos, Enrique; Rubio-Retama, Jorge

doi:10.1016/j.colsurfb.2013.09.051

Cited by 19 publications

(11 citation statements)

References 26 publications

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“…After reaction with glutaraldehyde, an increase of the relative intensity of the vibrational bands at ñ = 2700-2900 cm À1 suggestst he presence of more CH 2 groups. [22] The stretchingm ode of the imine bond (N=CHÀ)a nd aldehyde (C=O) were not easy to distinguish from the existing silica bands and could not be assigned. The last two steps in the silica functionalization (Fe 3 O 4 @SiO 2 -HYP-(NH 2 ) z and Fe 3 O 4 @SiO 2 -HYP-N(CH 2 PPh 2 ) 2 )d on ot lead to significant changes in the FTIR spectra, which are dominated by the vibrational modeso ft he silica matrix.…”

Section: Resultsmentioning

confidence: 99%

Support Functionalization with a Phosphine‐Containing Hyperbranched Polymer: A Strategy to Enhance Phosphine Grafting and Metal Loading in a Hydroformylation Catalyst

et al. 2016

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We present the design of a hydroformylation catalyst through the immobilization of air‐stable Rh nanoparticles (NPs) on a magnetic support functionalized with a hyperbranched polymer that bears terminal phosphine groups. The catalyst modification with the hyperbranched polymer improved the metal–support interaction, the metal loading, and the catalytic activity. The catalyst was active for the hydroformylation of natural products, such as estragole, and could be used in successive reactions with negligible metal leaching. The phosphine grafting played a key role in the recyclability of Rh NPs under hydroformylation conditions. The catalytic activity was maintained in successive reactions, even if the catalyst was exposed to air during each recovery procedure. The modification of the support with hyperbranched polyester allowed us either to increase the number of Rh active species or to obtain more active Rh species on the catalyst surface.

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Section: Resultsmentioning

confidence: 99%

Support Functionalization with a Phosphine‐Containing Hyperbranched Polymer: A Strategy to Enhance Phosphine Grafting and Metal Loading in a Hydroformylation Catalyst

et al. 2016

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“…The result was also verified by FTIR in that the C=O stretching vibration peak and the N–H bending vibration peak of amide bond (–CONH–) was enhanced at 1715 and 1530 cm −1 , respectively. In addition, the vibration peak at 2925 cm −1 was observed, which was attributed to the C–H bond of methylene, indicating that the SF was successfully modified by APTES/SA [15]. As a result, the SF was translated into a hydrophobic state and had good compatibility with monomers, thus the SF could be introduced into PMMA as much as possible.…”

Section: Resultsmentioning

confidence: 99%

Preparation of heat resisting poly(methyl methacrylate)/silica fume composite microspheres used as ultra‐lightweight proppants

Chen

Wang

Yan

2014

Micro & Nano Letters

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Ultra-lightweight heat resisting poly(methyl methacrylate) (PMMA)/silica fume microspheres were successfully prepared via in-situ suspension polymerisation. Scanning electron microscopy indicated that PMMA/silica fume composite microspheres had good sphericity and the silica fume particles were evenly dispersed in microspheres and formed lots of macroporous material. Furthermore, density analysis illustrated that the density of composites was about 1.06-1.24 g/cm 3 with good suitability for water carrying. Thermal stability of the PMMA/silica fume composite particles was significantly better than pure for PMMA. Therefore, PMMA/silica fume composite microspheres possess an entirely feasible application in oil exploitation as ultra-lightweight proppants.

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“…The synthesis of hydrophobic magnetic particles was carried out according to the literature source . Instead of TEOS, PFOTES was used in order to hydrophobize the particles.…”

Section: Methodsmentioning

confidence: 99%

Superparamagnetic hydrophobic particles as shell material for digital microfluidic droplets and proof‐of‐principle reaction assessments with immobilized laccase

Al‐Kaidy

Tippkötter

2015

Engineering in Life Sciences

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In the field of biotechnology and molecular biology, the use of small liquid volumes has significant advantages. In particular, screening and optimization runs with acceptable amounts of expensive and hardly available catalysts, reagents, or biomolecules are feasible with microfluidic technologies. The presented new microfluidic system is based on the inclusion of small liquid volumes by a protective shell of magnetizable microparticles. Hereby, discrete aqueous microreactor drops with volumes of 1–30 μL can be formed on a simple planar surface. A digital movement and manipulation of the microreactor is performed by overlapping magnetic forces. The magnetic forces are generated by an electrical coil matrix positioned below a glass plate. With the new platform technology, several discrete reaction compartments can be moved simultaneously on one surface. Due to the magnetic fields, the reactors can even be merged to initiate reactions by mixing or positioned above surface‐immobilized catalysts and then opened by magnetic force. Comparative synthesis routes of the magnetizable shell particles and superhydrophobic glass slides including their performance and stability with the reaction platform are described. The influence of diffusive mass transport during the catalyzed reaction is discussed by evaluation finite element model of the microreactor. Furthermore, a first model dye reaction of the enzyme laccase has been established.

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Synthesis and characterization of biocatalytic γ-Fe2O3@SiO2 particles as recoverable bioreactors

Cited by 19 publications

References 26 publications

Support Functionalization with a Phosphine‐Containing Hyperbranched Polymer: A Strategy to Enhance Phosphine Grafting and Metal Loading in a Hydroformylation Catalyst

Support Functionalization with a Phosphine‐Containing Hyperbranched Polymer: A Strategy to Enhance Phosphine Grafting and Metal Loading in a Hydroformylation Catalyst

Preparation of heat resisting poly(methyl methacrylate)/silica fume composite microspheres used as ultra‐lightweight proppants

Superparamagnetic hydrophobic particles as shell material for digital microfluidic droplets and proof‐of‐principle reaction assessments with immobilized laccase

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