Aeropectin: Fully Biomass-Based Mechanically Strong and Thermal Superinsulating Aerogel

Rudaz, Cyrielle; Courson, Rémi; Bonnet, Laurent; Calas-Etienne, Sylvie; Sallée, Hébert; Budtova, Tatiana

doi:10.1021/bm500345u

Cited by 199 publications

(216 citation statements)

References 44 publications

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“…However, it remains to be verified whether the reason for this high pore volumes (4-150 nm pore size range) is due to the gelation technique or an inherent property of the biopolymers previously not addressed in literature. Pectin aerogels have been reported in literature to possess superinsulating properties 12 and alginate aerogels prepared by this technique also possess thermal conductivities in the superinsulating range 3,7 . Therefore, the amidated pectin aerogels produced by this technique may also be envisaged to possess superinsulating properties.…”

Section: Discussionmentioning

confidence: 99%

Preparation of Biopolymer Aerogels Using Green Solvents

Subrahmanyam

Gurikov

Meissner

et al. 2016

JoVE

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Although the first reports on aerogels made by Kistler 1 in the 1930s dealt with aerogels from both inorganic oxides (silica and others) and biopolymers (gelatin, agar, cellulose), only recently have biomasses been recognized as an abundant source of chemically diverse macromolecules for functional aerogel materials. Biopolymer aerogels (pectin, alginate, chitosan, cellulose, etc.) exhibit both specific inheritable functions of starting biopolymers and distinctive features of aerogels (80-99% porosity and specific surface up to 800 m 2 /g). This synergy of properties makes biopolymer aerogels promising candidates for a wide gamut of applications such as thermal insulation, tissue engineering and regenerative medicine, drug delivery systems, functional foods, catalysts, adsorbents and sensors. This work demonstrates the use of pressurized carbon dioxide (5 MPa) for the ionic cross linking of amidated pectin into hydrogels. Initially a biopolymer/salt dispersion is prepared in water. Under pressurized CO 2 conditions, the pH of the biopolymer solution is lowered to 3 which releases the crosslinking cations from the salt to bind with the biopolymer yielding hydrogels. Solvent exchange to ethanol and further supercritical CO 2 drying (10 -12 MPa) yield aerogels. Obtained aerogels are ultra-porous with low density (as low as 0.02 g/cm 3 ), high specific surface area (350 -500 m 2 /g) and pore volume (3 -7 cm 3

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Section: Discussionmentioning

confidence: 99%

Preparation of Biopolymer Aerogels Using Green Solvents

Subrahmanyam

Gurikov

Meissner

et al. 2016

JoVE

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“…This synergy of properties has prompted to view biopolymer aerogels as promising candidates for a wide gamut of applications. Up-to-date reports on biopolymer aerogels describe their use for thermal insulation [3][4][5][6][7][8], tissue engineering and regenerative medicine [9], drug delivery systems [10,11], functional foods [12], as catalysts and sensors [13,14], adsorbents [15][16][17]and as starting materials for carbon aerogels [18] and porous mixed-oxides [13,19].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the lowest thermal conductivity (λ) obtained for biopolymer aerogels (λ = 16 -18 mW/m·K [5] [8]) are on the level with the best organic aerogels such as resorcinolformaldehyde and polyurea systems (λ = 12 -18 mW/m·K [20,21]) and almost close to the best inorganic aerogels such as silica (λ = 9 -13 mW/m·K) [2].…”

Section: Introductionmentioning

confidence: 99%

Hybrid alginate based aerogels by carbon dioxide induced gelation: Novel technique for multiple applications

Raman

Gurikov

Смирнова

2015

The Journal of Supercritical Fluids

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“…[18] Surface-carboxylated nanofibrillated cellulose aerogels display thermal conductivities as low as 18 mW m À1 K À1 .…”

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confidence: 99%

Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

et al. 2015

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International audienceSilica aerogels are excellent thermal insulators, but their brittle nature has prevented widespread application. To overcome these mechanical limitations, silica–biopolymer hybrids are a promising alternative. A one-pot process to monolithic, superinsulating pectin–silica hybrid aerogels is presented. Their structural and physical properties can be tuned by adjusting the gelation pH and pectin concentration. Hybrid aerogels made at pH 1.5 exhibit minimal dust release and vastly improved mechanical properties while remaining excellent thermal insulators. The change in the mechanical properties is directly linked to the observed “neck-free” nanoscale network structure with thicker struts. Such a design is superior to “neck-limited”, classical inorganic aerogels. This new class of materials opens up new perspectives for novel silica–biopolymer nanocomposite aerogels

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Aeropectin: Fully Biomass-Based Mechanically Strong and Thermal Superinsulating Aerogel

Cited by 199 publications

References 44 publications

Preparation of Biopolymer Aerogels Using Green Solvents

Preparation of Biopolymer Aerogels Using Green Solvents

Hybrid alginate based aerogels by carbon dioxide induced gelation: Novel technique for multiple applications

Strong, Thermally Superinsulating Biopolymer–Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

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