Directed assembly of nanoparticles to isolated diatom valves using the non-wetting characteristics after pyrolysis

Jantschke, Anne; Fischer, Cathleen; Hensel, René; Braun, Hans‐Georg; Brunner, Eike

doi:10.1039/c4nr02662d

Cited by 25 publications

(23 citation statements)

References 81 publications

(81 reference statements)

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“…Calculating the surface area of native Sorites (after removing the top layer) using the Brunauer–Emmett–Teller theory yields a value of ≈5 m² g −1 . This value is comparable to the surface area reported for other biological scaffolds in use (1.4–51 m² g −1 ) . Coating Sorites with Co followed by etching of the template doubled the surface area of the structures (≈8 m² g −1 ).…”

supporting

confidence: 80%

Design of Hierarchal 3D Metal Oxide Structures for Water Oxidation and Purification

Diab

Shreteh

Afik

et al. 2018

Advanced Sustainable Systems

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Given their unique properties, tremendous progress is realized in the use of nanostructured materials for various applications. However, their incorporation and fabrication into prototypic devices remain challenging due to their limited ability to form hierarchical 3D structures through the use of large scale, low cost, and facile processes. Herein, this challenge is addressed and the growth of unique hierarchical structures is demonstrated by coating calcareous foraminiferal shells with metal oxide materials via simple and inexpensive processes conducted on a large scale. Foraminifera are highly diverse and abundant marine unicellular protists surrounded by large, ranging from 0.1 mm to more than 200 mm in size, identical porous, and complex hierarchical shells. In the present study, these hierarchal structures are investigated in electrochemical water oxidation reactions and tested in terms of their ability to purify water from inorganic (metal ions) contaminates. The remarkable performances of the prototype filters and catalysts developed here, among the best recorded values in both fields, are reported. These findings thus open new perspectives for catalytic and water purification applications.

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supporting

confidence: 80%

Design of Hierarchal 3D Metal Oxide Structures for Water Oxidation and Purification

Diab

Shreteh

Afik

et al. 2018

Advanced Sustainable Systems

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“…The valves exhibit a hierarchical pore architecture and show a honeycomb-like structure with hexagonal chambers and a silica layer with a highly regular pore pattern at the bottom (Figure 1a,d). 26,27 Calcined S. turris biosilica has a SSA of 56 m 2 g –1 and a pore volume of 0.15 cm 3 g –1 (Table 2). E. zodiacus biosilica exhibits submicron-sized pores of squared appearance, which further exhibit an array of even smaller pores (Figure 1b,e).…”

Section: Results and Discussionmentioning

confidence: 99%

“…These species were grown as reported elsewhere. 26 Detailed procedures for the cultivation of S. turris , E. zodiacus , and T. pseudonana can be found in the Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

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Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose

et al. 2016

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Diatoms are unicellular algae of enormous biodiversity that occur in all water habitats on earth. Their cell walls are composed of amorphous biosilica and exhibit species-specific nanoporous to microporous and macroporous patterning. Therefore, diatom biosilica is a promising renewable material for various applications, such as in catalysis, drug-delivery systems, and biophotonics. In this study, diatom biosilica of three different species ( Stephanopyxis turris , Eucampia zodiacus , and Thalassiosira 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. Because of its high specific surface area, well-established transport pores, and the presence of small, homogeneously distributed gold nanoparticles on the surface, diatom biosilica provides a highly catalytically active surface and advanced accessibility to the active sites. In comparison to those of the used reference supports, higher catalytic activities (up to 3.28 × 10 –4 mmol Glc s –1 mg Au –1 for T. pseudonana biosilica) and slower deactivation were observed for two of the diatom biosilica materials. In addition, diatom biosilica showed very high gold-loading capacities (up to 45 wt %), with a homogeneous nanoparticle distribution.

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“…183 Furthermore, liquids containing surfactants, proteins, sugars or other organic and inorganic compounds may behave in a different manner due to adsorption processes or chemical reactions at the three-phase contact line that may vary the nature of the surface. However, the proposed concept is valid only for ''ideal'' liquids on ''ideal'' substrates and does not cover liquid penetration into the cavities by swelling, intercalating, or creeping of the liquid with the solid material.…”

Section: Cassie-wenzel Wetting Transitionmentioning

confidence: 99%

The springtail cuticle as a blueprint for omniphobic surfaces

2016

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Omniphobic surfaces found in nature have great potential for enabling novel and emerging products and technologies to facilitate the daily life of human societies. One example is the water and even oil-repellent cuticle of springtails (Collembola). The wingless arthropods evolved a highly textured, hierarchically arranged surface pattern that affords mechanical robustness and wetting resistance even at elevated hydrostatic pressures. Springtail cuticle-derived surfaces therefore promise to overcome limitations of lotus-inspired surfaces (low durability, insufficient repellence of low surface tension liquids). In this review, we report on the liquid-repellent natural surfaces of arthropods living in aqueous or temporarily flooded habitats including water-walking insects or water spiders. In particular, we focus on springtails presenting an overview on the cuticular morphology and chemistry and their biological relevance. Based on the obtained liquid repellence of a variety of liquids with remarkable efficiency, the review provides general design criteria for robust omniphobic surfaces. In particular, the resistance against complete wetting and the mechanical stability strongly both depend on the topographical features of the nano- and micropatterned surface. The current understanding of the underlying principles and approaches to their technological implementation are summarized and discussed.

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Directed assembly of nanoparticles to isolated diatom valves using the non-wetting characteristics after pyrolysis

Cited by 25 publications

References 81 publications

Design of Hierarchal 3D Metal Oxide Structures for Water Oxidation and Purification

Design of Hierarchal 3D Metal Oxide Structures for Water Oxidation and Purification

Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose

The springtail cuticle as a blueprint for omniphobic surfaces

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