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Oral Poster

Diatom Biosilica for Catalytic and Adsorptive Applications

Tuesday (09.05.2017)
18:30 - 18:33
Part of:
18:00 Oral Poster Fibrinogen Adsorption and Network Formation on Melt Drawn Isotactic Polybutene-1 Thin Films 1 Xiaoyuan Zhang
18:03 Oral Poster Characterization of biomaterials using AFM based fast nanoscale imaging and quantitative nanomechanical techniques 1 Dr. Tanja Neumann
18:06 Oral Poster Hydrothermal conversion of porous Ca carbonate biominerals into bioactive Ca phosphate materials: towards antibiotic and antiosteoporotic bone graft substitutes 1 Dr. Ingo Sethmann
18:09 Oral Poster Study on the retarding effect of phytic acid on the hydration of a brushite cement 1 Dr. Katrin Hurle
18:12 Oral Poster Synthesis of hollow mesoporous bioactive glass nanoparticles with uniform size and shape 1 Kai Zheng
18:15 Oral Poster Systematic post-operative clinical assessment of lumbar ventrolateral vertebroplasty in the large animal model sheep using a minimally-invasive approach 1 Francesca Gunnella
18:18 Oral Poster Dual setting system – characterization of PEG-based-hydrogel/brushite composites for biomedical application 0 Michaela Rödel
18:21 Oral Poster The effect of HAc etching on the degradation behaviour of Mg-5Gd 1 Dr. Frank Feyerabend
18:24 Oral Poster Degradation behavior of as cast and powder metallurgy processed Mg-Ca alloys 0 Dipl.-Ing. Eshwara Phani Shubhakar Nidadavolu
18:27 Oral Poster Bio-inspired high-performance green biopolymer fibers 0 Dr. Hendrik Bargel
18:30 Oral Poster Diatom Biosilica for Catalytic and Adsorptive Applications 1 Cathleen Fischer
18:33 Oral Poster Gallotannin polyphenol enhancement of biomimetic enzymatic hydrogel mineralization 1 Dr. Timothy E.L. Douglas
18:36 Oral Poster Starch in textile application: Modification, processing and product development 1 Pavan Kumar Manvi
18:39 Oral Poster Recombinant Spider Silk Proteins Used as Biomedical Coating Material 1 Christian Borkner
18:42 Oral Poster Effects of cross-linking modifications on Collagen: a preliminary biological evaluation 1 Dr. Mattia Vacchini
18:45 Oral Poster Endothelialization of polymethylpentene fibers as a step towards patient-specific medical devices 1 M.Sc. Annika Wenz
18:48 Oral Poster Hybrid poly-lactide/gelatin electrospun scaffolds with controlled hydrophilicity and wettability. 1 Germano Piccirillo
18:51 Oral Poster Funktion and structure - Combined optical functionality and specific bio-interaction for multifunctional biomedical materials 1 Dr. Tina Sabel
18:57 Oral Poster Bacterial adhesion to PEEK compared to exemplary dental ceramic, metallic and composite materials 1 Dr. Lutz Scheideler
19:00 Oral Poster Attachment of Nanoparticle Drug-Release Systems on Shish-Kebab structured Poly(?-Caprolactone) Nanofibers 1 Dominik de Cassan
19:06 Oral Poster Improved Nanofleeces for Cell Culture Applications 1 Tobias Kürbitz

Session P.1: Oral Poster Session 1
Belongs to:
Topic P: Postersession

Diatoms are unicellular algae that exist in all water habitats and have an enormous biodiversity. Their cell walls of amorphous biosilica exhibit a species-specific nano- to micro patterning. Diatom biosilica offers interesting perspectives for technological applications due to its outstanding properties. It is highly porous, biocompatible, thermally stable and chemically inert. The potential of diatom biosilica for different applications, e.g. in catalysis, for drug-delivery-systems, and biophotonics is a subject of ongoing research.

In this study, diatom biosilica of three different species (S. turris, E. zodiacus, and T. pseudonana) was used as support material for gold nanoparticles using a covalent coupling method. The resulting catalysts were applied for the oxidation of D-glucose to D-gluconic acid. Due to high specific surface area, well established transport pores, and small, homogenously distributed gold nanoparticles on the surface, the diatom biosilica provides a high catalytically active surface and an advanced accessibility of the active sites. In comparison with used reference supports higher catalytic activity (up to 3.28 · 10 -4 mmolGlc s-1 mgAu-1 for T. pseudonana biosilica) and slower deactivation was achieved by two of the diatom biosilica materials. In addition, diatom biosilica showed very high gold loading capacities (up to 45 wt%) keeping a homogenous nanoparticle distribution. Another application is the conversion of diatom biosilica into highly porous carbon materials. Biosilica of the diatom species T. pseudonana was used as hard template for the synthesis of silicon carbide-derived carbons. The typical species-specific macroporous structure is retained during the nanocasting-chlorine treatment process and the resulting materials exhibit very high specific surface areas up to 2300 m2 g -1. Bioinspried carbons show very high capacities in mercury adsorption from aqueous solution of more than 1000 mg g -1

In conclusion, diatom biosilica is a promising alternative to synthetic silica materials for catalytic and adsorptive applications due to its favorable properties and natural origin.


Additional Authors:
  • Prof. Eike Brunner
    TU Dresden