Mesoporous Alumina from Colloidal Biotemplating of Al Clusters

Sachse, Alexander; Castro, Inês Rugani Ribeiro de; Kostov, Konstantin; Gérardin, Corine; Belamie, Emmanuel; Alonso, Bruno

doi:10.1002/chem.201405444

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…The upfield shifting of the peaks in this spectrum compared to what is expected for γ-Al 2 O 3 may be due to the more disordered structure of the amorphous Al 2 O 3 . 36,57 Upon calcination at 900 °C, the peaks sharpen and shift downfield, consistent with the improved crystallinity observed in the PXRD. The second minor tetrahedral site is again observed in this sample, both as a visible shoulder of the tetrahedral peak in the 1D spectrum (Figure 4c) and as a distinct peak in the MQ-MAS spectrum (Figure S16c).…”

supporting

confidence: 76%

“…34 Recently, we prepared helicoidal mesoporous chitosan templates from crustacean shells and then functionalized these with PMMA to form photonic hydrogels. 35 However, there is a limited description of the use of chitosan nanofibrils to template alumina materials as there are only two reports, of chitin-templated mesoporous alumina 36 and chitosan-templated alumina microspheres. 37 Many papers have reported the preparation of alumina catalyst supports, 9,38−40 but there are very few investigations of making γ-Al 2 O 3 aerogel-like materials.…”

mentioning

confidence: 99%

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Biotemplated Lightweight γ-Alumina Aerogels

et al. 2018

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We present the biotemplating of γ-Al 2 O 3 aerogels with chitosan nanofibrils. Aluminum−chitosan interactions cause the swelling of iridescent chitosan structures into helicoidal hydrogels and the subsequent aqueous dissolution of swollen fibrils to form Al− chitosan solutions. Viscous aqueous solutions of Al 3+ −chitosan hybrid nanofibers were freeze-dried to give lightweight cotton-like aerogels. Homogeneous incorporation of Al 3+ ions into chitosan yields water-soluble nanofibrils that can serve as polymeric templates to support Al 3+ ions in the aerogel composites. We investigated thermal removal of chitosan in the composites to obtain lightweight γ-Al 2 O 3 nanocrystal aerogels that retain the weblike fiber networks of the chitosan template. These biotemplated alumina aerogel materials are promising candidates for catalyst supports and thermal insulation.

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supporting

confidence: 76%

mentioning

confidence: 99%

Biotemplated Lightweight γ-Alumina Aerogels

et al. 2018

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“…Boltoeva et al demonstrated that an alternating current electric field is capable of aligning NCh in a few minutes and they used this to obtain chitin-silica composites [90]. With the same method, mesoporous silica-titania and pure alumina catalysts were templated, but no hierarchical order was reported [91][92][93].…”

Section: Nanocrystalline Chitinmentioning

confidence: 99%

Liquid crystal templating of nanomaterials with nature's toolbox

Meseck

Terpstra

MacLachlan

2017

Current Opinion in Colloid & Interface Science

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Naturally occurring biomolecules are sustainable and green precursors for the development of new materials. Within this family of natural materials, cellulose nanocrystals (CNCs) have emerged as one of the most promising materials because of their outstanding physico-chemical properties and the possibility to produce them in large quantities. One key trait of CNCs is their ability to self-assemble into a chiral nematic liquid crystalline phase. In this review, we discuss how templating can be used to transfer the three-dimensional structure of liquid crystalline phases onto solid materials. This is followed by examples that illustrate the fascinating properties and potential applications that arise from the resulting nanostructured materials such as sensing and catalysis. We then summarize efforts to use the liquid crystalline phase of a selection of other biopolymers for templating. While nanocrystalline chitin, having very similar properties to CNCs, has been successfully employed to make a variety of new materials, efforts to template liquid crystal phases of other biomolecules have been met with limited success. However, we discuss virus nanoparticles and collagen as examples to highlight further possibilities for materials research.

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“…The first two weight loss intervals below 160 °C are attributed to massive loss of H 2 O and chlorine compounds in Al 3+ -based gels with the increase of temperature (the removal of chlorine compounds is determined according to the following XRD results). 53 , 54 The third weight loss between 160 and 350 °C occurs at the same interval as that of the template PEO- b -PMMA (Fig. S3a, ESI † ), indicating the decomposition of the block copolymer.…”

Section: Resultsmentioning

confidence: 93%