Natural materials with high surface area. Physisorption methods for the characterization of the texture and surface of polysaccharide aerogels

Robitzer, Mike; Renzo, Francesco Di; Quignard, Françoise

doi:10.1016/j.micromeso.2010.10.006

Cited by 99 publications

(51 citation statements)

References 46 publications

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“…Biopolymer‐Aerogele sind auch aus Carrageen, Agar, Xanthan, Guar und Pullulan synthetisiert worden. Alle diese Polysaccharide haben spezifische Molekülstrukturen, die zu verschiedenen Gelbildungsmechanismen und Gel‐ und Aerogeleigenschaften führen.…”

Section: Biopolymer‐aerogelsystemeunclassified

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Zhao

Malfait

Guerrero‐Alburquerque

et al. 2018

Angewandte Chemie

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Biopolymer‐Aerogele gehören zu den ersten Aerogelen, die hergestellt wurden, aber erst im letzten Jahrzehnt kam es zu einer Belebung der Forschung über Biopolymer‐ und Biopolymer‐Verbundstoff‐Aerogele, die durch Fragen der Nachhaltigkeit, einstellbare spezielle Eigenschaften und einfache Funktionalisierung motiviert wird. Biopolymer‐Aerogele und offenzellige Biopolymer‐Schäume haben Potenzial für klassische Aerogel‐Anwendungen wie Wärmedämmung und neue Anwendungen bei der Filtration, Öl‐Wasser‐Trennung, CO2‐Abscheidung, Katalyse und in der Medizin. Das Gebiet der Biopolymer‐Aerogele wird heute von der empirischen Materialentwicklung auf dem Labormaßstab beherrscht und benötigt eine bessere theoretische Grundlage und Test in Pilotanlagen. Unser Aufsatz umfasst eine Datenbank mit über 3800 Biopolymer‐Aerogel‐Eigenschaften, beurteilt den Forschungsstand auf dem Gebiet und diskutiert wissenschaftliche, technologische und wirtschaftliche Hindernisse bei der Kommerzialisierung dieser faszinierenden Materialien.

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Section: Biopolymer‐aerogelsystemeunclassified

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Zhao

Malfait

Guerrero‐Alburquerque

et al. 2018

Angewandte Chemie

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“…Among numerous materials, chitosan is a kind of unique polysaccharide composed of glucosamine units and N ‐acetyl glucosamine units, with many favorable characteristics, including biocompatibility, biodegradability, nontoxicity, and chemical activity . Because of these outstanding properties, chitosan can be selected as a useful and effective polymer matrix in composite materials.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic and nanoporous chitosan–silica composite aerogels for oil absorption

Liu

Dong

et al. 2014

J of Applied Polymer Sci

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Hydrophobic and nanoporous chitosan-silica composite aerogels with low density, high porosity, and superior oil absorbency were successfully prepared by a typical sol-gel method and a two-step hydrophobic treatment. The morphologies, porosity characteristics, mechanical properties, thermal stability, hydrophobicity, and oil absorbencies of the composite aerogels were systematically investigated. The nitrogen physisorption analysis showed that composite aerogels had large specific surface areas and uniform nanoporous structures. In addition, the composite aerogels could support 7000 times its own weight; this indicated the role of the supporting skeleton played by chitosan. The hydrophobicity and lipophilicity was demonstrated with a water contact angle of 137 and an oil contact angle of 0 . Importantly, the composite aerogel with 20 wt % chitosan had a relatively high oil absorbency of 30 g/g and could be reused up to 10 times. Therefore, the chitosan-silica composite aerogels in this study had a broad prospect to be used as efficient and recyclable oil absorbents.

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“…Theh igh surface area observed is an important characteristic that ac athode should possess to enhance the ORR performance in MFCs used for wastewater treatmentsb ecause oxygeni sd issolved in water and needs relatively largep ores for the water flow through the cathode.T he formation of multiscale pores also guarantees an enhancement in the materialss urfacea rea, providing al arger number of catalytic sites.T he NC aerogels urface average values are about 320 m 2 g À1 according to the nitrogen adsorption-desorption isotherme valuation and they have been estimated from Brunner-Emmett-Teller (BET) plots.T his value is comparable with those obtained in literature for aerogels prepared from natural precursors. [34] Slightly lower values were observedi nt he case of NC1L samples (about 270 m 2 g À1 )c ompared to NC1G samples and this could be one of the reasons for their lower cell performancea sw as previously reported by Wohlgemuth etal. [22] Another possible reason for the different behavior of NC aerogels during the MFC test is the nitrogen amount and the types of defects that are formed inside the different materials by amino acid addition.…”

Section: Resultsmentioning

confidence: 65%

“…The NC aerogel surface average values are about 320 m 2 g −1 according to the nitrogen adsorption–desorption isotherm evaluation and they have been estimated from Brunner–Emmett–Teller (BET) plots. This value is comparable with those obtained in literature for aerogels prepared from natural precursors . Slightly lower values were observed in the case of NC1L samples (about 270 m 2 g −1 ) compared to NC1G samples and this could be one of the reasons for their lower cell performance as was previously reported by Wohlgemuth et al …”

Section: Resultsmentioning

confidence: 99%

Green‐Synthesized Nitrogen‐Doped Carbon‐Based Aerogels as Environmentally Friendly Catalysts for Oxygen Reduction in Microbial Fuel Cells

et al. 2018

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A green approach to the synthesis of nitrogen‐doped, carbon‐based aerogels with good conductivity and catalytic properties is presented. With the aim to design an easily sustainable process, the starting precursors are selected from abundant waste‐related organic materials. The naturally derived polysaccharide agar acts as the carbon source in a water solution and an amino acid, glycine or lysine, is used as the nitrogen source. Using this synthesis approach, nitrogen defects are created in a 3D porous aerogel. They are shown to act as active catalytic sites for the reaction of oxygen reduction to water as demonstrated by electrochemical measurements. The best performing materials are tested as cathodes in microbial fuel cells for 50 days, in conditions close to those the device would face in a real environment. The glycine‐derived carbon aerogels with the higher content of pyridinic nitrogen exhibit the best performance, as confirmed by several morphological characterizations.

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Natural materials with high surface area. Physisorption methods for the characterization of the texture and surface of polysaccharide aerogels

Cited by 99 publications

References 46 publications

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

Hydrophobic and nanoporous chitosan–silica composite aerogels for oil absorption

Green‐Synthesized Nitrogen‐Doped Carbon‐Based Aerogels as Environmentally Friendly Catalysts for Oxygen Reduction in Microbial Fuel Cells

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