Design of polymer nanofiber systems for the immobilization of homogeneous catalysts – Preparation and leaching studies

Stasiak, Michael; Röben, Caren; Rosenberger, Nadine; Schleth, Florian; Studer, Armido; Greiner, Andreas; Wendorff, Joachim H.

doi:10.1016/j.polymer.2007.07.006

Cited by 45 publications

(37 citation statements)

References 21 publications

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“…[86,87] It is shown that catalysts covalently bound to low-molecular weight polystyrene (Mn > 4000 g mol À1 ) can be immobilized into high molecular weight polystyrene nanofibers using the electrospinning process. The immobilized catalyst oligostyrene conjugates are well dispersed within the fibers as shown by DSC and X-ray studies.…”

Section: Homogeneous Catalysismentioning

confidence: 99%

Electrospinning of Manmade and Biopolymer Nanofibers—Progress in Techniques, Materials, and Applications

Agarwal¹,

Greiner²,

Wendorff³

2009

Adv Funct Materials

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246

155

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Electrospinning of nanofibers has developed quickly from a laboratory curiosity to a highly versatile method for the preparation of a wide variety of nanofibers, which are of interest from a fundamental as well as a technical point of view. A wide variety of materials has been processed into individual nanofibers or nanofiber mats with very different morphologies. The diverse properties of these nanofibers, based on different physical, chemical, or biological behavior, mean they are of interest for different applications ranging from filtration, antibacterial coatings, drug release formulations, tissue engineering, living membranes, sensors, and so on. A particular advantage of electrospinning is that numerous non‐fiber forming materials can be immobilized by electrospinning in nanofiber nonwovens, even very sensitive biological objects such as virus, bacteria, and cells. The progress made during the last few years in the field of electrospinning is fascinating and is highlighted in this Feature Article, with particular emphasis on results obtained in the authors' research units. Specific areas of importance for the future of electrospinning, and which may open up novel applications, are also highlighted.

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Section: Homogeneous Catalysismentioning

confidence: 99%

Electrospinning of Manmade and Biopolymer Nanofibers—Progress in Techniques, Materials, and Applications

Agarwal¹,

Greiner²,

Wendorff³

2009

Adv Funct Materials

Self Cite

246

155

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“…The same research group has in fact used the same approach for immobilization of proline, but the procedure will not be detailed further here as these fibres were not tested in catalytic reactions. [60] As we have pointed out earlier, methodologies for controlled radical polymerization, such as NMP, ATRP and RAFT, could achieve considerable importance in organic synthesis in the time to come. [46][47] Their lack of use within organic synthesis is probably, but unfortunately, a result of the invisible barriers existing between the different fields of chemistry.…”

Section: Polymer-supported Diarylprolinol Silyl Ethersmentioning

confidence: 99%

Polymer‐Supported Chiral Organocatalysts: Synthetic Strategies for the Road Towards Affordable Polymeric Immobilization

2010

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In this microreview, we highlight the field of polymer‐supported organocatalysis, especially immobilized enamine and iminium organocatalysts. We try to formalize the overall synthetic strategies for polymeric immobilization as spanning the area of two overlapping regions, from a copolymer strategy favoured by low‐valued and small catalysts to a classical post‐modification strategy favoured by valuable and/or large catalysts. Organocatalysis is particularly interesting as it is probably best described as being located in the transitional region, and we will trace the historic and factual origins for the unfortunate predispositions towards post‐modification schemes. In addition, we try to identify affordable and useful syntheses of key organocatalyst immobilization intermediates, as well as polymer supports that are more compatible with a broader range of reaction solvent polarity, something of crucial importance in organocatalysis.

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“…4 This technique creates a high specific surface area to volume ratio, high porosity and continuous fibers. 5 Nanofibers have various applications including textile devices, 6,7 catalysts, 8,9 membranes, 10 sensors, 11 biomedical applications, 7,12 and filtration. [11][12][13][14] The combination of sol-gel and electrospinning process is the most promising technology for the fabrication of nanofibers.…”

Section: Introductionmentioning

confidence: 99%

Structural and Spectroscopic Investigation of Ceria Nanofibers Fabricated by Electrospinning Process

Hwang¹,

Park²,

Kang³

2011

Bulletin of the Korean Chemical Society

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We fabricated ceria (CeO 2 ) nanofibers by applying a mixed solution of polyvinylpyrrolidone (PVP) and various concentrations of cerium nitrate hydrate (Ce(NO 3 ) 3 ) ranging from 15.0 to 26.0 wt % by the electrospinning process. Ceria nanofibers were obtained after calcining PVP/Ce(NO 3 ) 3 nanofiber composites at 873 and 1173 K. The SEM images indicated that the diameters of CeO 2 nanofibers calcined at 873 and 1173 K were smaller than those of nanofibers obtained at RT. As the amount of cerium increased, the diameter of CeO 2 nanofibers increased. XRD analysis revealed that the ceria nanofibers were in cubic form. TEM results revealed that the ceria nanofibers were formed by the interconnection of Ce oxide nanoparticles. The ceria nanofibers obtained at low concentrations of Ce (CeL) showed spotty ring patterns indicated that the ceria nanofibers were polycrystalline structure. And the ceria nanofibers obtained at high concentration of Ce (CeH) showed fcc (001) diffraction pattern. XPS study indicated that the oxidation of Ce shifted from Ce 3+ to Ce 4+ as the calcination temperature increased.

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Design of polymer nanofiber systems for the immobilization of homogeneous catalysts – Preparation and leaching studies

Cited by 45 publications

References 21 publications

Electrospinning of Manmade and Biopolymer Nanofibers—Progress in Techniques, Materials, and Applications

Electrospinning of Manmade and Biopolymer Nanofibers—Progress in Techniques, Materials, and Applications

Polymer‐Supported Chiral Organocatalysts: Synthetic Strategies for the Road Towards Affordable Polymeric Immobilization

Structural and Spectroscopic Investigation of Ceria Nanofibers Fabricated by Electrospinning Process

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