High aspect ratio glass structures produced by means of the drawing technology

Mrotzek, S.; Hülsenberg, Dagmar; Rädlein, Edda

doi:10.1007/s00542-008-0562-y

Cited by 7 publications

(10 citation statements)

References 1 publication

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“…14), but the technology principally allows to prepare monoliths with sub-micrometer macropore size and skeleton thickness (Fig. 15) [87,90]. Pore size in the silica skeleton can be controlled in the meso-and macropore range (2 -200 nm).…”

Section: Silica-based Monoliths In Solid-liquid Catalysismentioning

confidence: 99%

“…The price is paid in terms of backpressure, which of course needs to be worked out carefully. The macroscopic dimensions of the monoliths, their macropore size, skeleton thickness, and macroporosity can be tuned by the number of tubes in the starting bundle, the tube diameter, wall thickness, and the drawing velocity and pressure regime in the hot zone of the furnace [89,90]. Porous glasses are characterized by the typical surface chemistry of amorphous silica materials [82].…”

Section: Silica-based Monoliths In Solid-liquid Catalysismentioning

confidence: 99%

“… Example of microstructured fibers with sub‐micrometer aligned macropores (diameter ∼900 nm) and nonporous glass walls. Reproduced with permission from 90, © 2008 Springer Science and Business Media. …”

Section: Preparation Of Sol‐gel and Porous Glass‐based Silica Monolmentioning

confidence: 99%

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Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Enke

Gläser

Tallarek

2016

Chemie Ingenieur Technik

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This work draws attention to both prospects and challenges for silica monoliths in solid-liquid catalysis at ultrahigh efficiency. The fundamental advantages of silica monoliths as support structure over particulate fixed beds and organicpolymer monoliths are illustrated as well as recent applications as flow-through microreactors for the production of fine chemicals. Preparation routes to sol-gel and porous glass-based silica monoliths featuring a hierarchical pore structure are described and their potential use as short-contact-time reactors is highlighted together with a view on the multiscale characterization and their rational design by establishing quantitative synthesis-morphology-transport relationships.

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Section: Silica-based Monoliths In Solid-liquid Catalysismentioning

confidence: 99%

Section: Silica-based Monoliths In Solid-liquid Catalysismentioning

confidence: 99%

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Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Enke

Gläser

Tallarek

2016

Chemie Ingenieur Technik

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“…Then, the preformed glass bundle will be locally heated up to the softening point of the glass and drawn down with a certain feed to drawing ratio in order to control the final diameter of the bundle. 26,27 The final geometry and porosity of the drawn bundle is determined by the starting materials, e.g. rods or tubes, and their arrangement within the bundle.…”

Section: Njc Perspectivementioning

confidence: 99%

Recent advances in the synthesis of hierarchically porous silica materials on the basis of porous glasses

et al. 2016

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The thermal phase separation and subsequent leaching of sodium borosilicate glasses is a well established route for the preparation of porous glasses exhibiting adjustable pore sizes in the range of 1 nm up to almost 1 mm as well as a very flexible geometric shape. The combination of this route with a large spectrum of synthesis strategies for the implementation of an additional pore system enables the preparation of hierarchically porous glass-based materials. This review covers a wide range of preparative routes for hierarchically porous silica materials starting from the sodium borosilicate glass with a special emphasis on the very recent developments in this versatile field of materials engineering.

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“…prepared porous alumina ceramics with uni‐directionally oriented pores by extrusion method, using carbon fibers or a plastic substance as pore formers. Glass with an aligned pore system can be produced from hollow glass fiber bundles by using a special drawing technology . Another approach was reported by Lloyd et al .…”

Section: Introductionmentioning

confidence: 99%

Preparation of Porous Glass Monoliths with an Aligned Pore System via Stretch Forming

et al. 2012

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Porous glasses with an aligned pore system were prepared by using a stretch-forming device. For the experiments a sodium borosilicate glass with the composition 62.5 wt% SiO 2 , 30.5 wt% B 2 O 3 and 7 wt% Na 2 O was prepared. The characterization of this glass includes X-ray fluorescence analysis and dilatometry. The applied stretch-forming apparatus allowed the simultaneous phase separation and elongation of the glass samples. The obtained glass templates were chemically treated with hydrochloric acid and sodium hydroxide solution to extract the soluble sodium rich borate phase. The resulting porous glass samples were characterized by environmental scanning electron microscopy and mercury intrusion. Different degrees of pore alignment were realized by varying the parameters of the stretch-forming process.

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High aspect ratio glass structures produced by means of the drawing technology

Abstract: In this work the production of microstructured glasses by means of the drawing technology is presented. The technology and the influence of the process parameters are described. Examples of drawn structures are shown and applications are pointed out.

Cited by 7 publications

References 1 publication

Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Sol‐Gel and Porous Glass‐Based Silica Monoliths with Hierarchical Pore Structure for Solid‐Liquid Catalysis

Recent advances in the synthesis of hierarchically porous silica materials on the basis of porous glasses

Preparation of Porous Glass Monoliths with an Aligned Pore System via Stretch Forming

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