A novel approach to alginate aerogels: carbon dioxide induced gelation

Gurikov, Pavel; Raman, S. P.; Weinrich, Dirk; Fricke, Marc; Смирнова, Ирина

doi:10.1039/c4ra14653k

Cited by 96 publications

(95 citation statements)

References 47 publications

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“…However, both techniques face an issue regarding the homogeneity of the final gel when produced in slab or monolithic form. This work demonstrates the use of high pressure CO 2 (5 MPa) for the production of amidated pectin hydrogels building further on previous works on alginate gels 3,7 . In brief, it is an internal setting gelation technique that utilizes pressurized CO 2 to reduce pH instead of weak acids to produce homogeneous gels.…”

Section: Introductionsupporting

confidence: 72%

“…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%

“…6-7 residence volumes are required over a period of 6 hr. Refer to Gurikov et al 7 for further information.…”

Section: Introductionmentioning

confidence: 99%

“…The calcium ions crosslink with the amidated pectin biopolymer to yield hydrogels. Stable homogeneous gels down to very low biopolymer concentrations (0.05 wt%) could be produced using this technique 7 .…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionsupporting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

“…6-7 residence volumes are required over a period of 6 hr. Refer to Gurikov et al 7 for further information.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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%

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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Aerogels

Смирнова¹,

Gurikov²,

Subrahmanyam³

2021

Kirk-Othmer Encyclopedia of Chemical Technology

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Aerogels are a class of open nonfluid porous solid materials known for their low density, high specific surface area, and accessible pores. This combination of characteristics makes them highly promising for a wide gamut of applications ranging from thermal and acoustic insulation, catalysts and sensors, adsorbents and absorbents, energy storage, carriers for drug delivery and nutrition, and scaffolds for tissue engineering and regenerative medicine to starting materials for carbon aerogels and porous mixed oxides. Aerogel technology has faced significant bottlenecks in its commercialization, since its discovery in the 1930s, due to limited technical information and processing expertise required for production scaling. This article presents the significant technology developments in the past 10 years, highlighting the paradigm shift in aerogel processing. Lastly, this article invites the reader to envisage and contribute to a new generation of aerogel materials and applications with the fundamental tenets of aerogel production and pore engineering.

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A novel approach to alginate aerogels: carbon dioxide induced gelation

Abstract: A novel process, carbon dioxide induced gelation, opens new pathways towards hydrogels and can be coupled with supercritical drying to produce aerogels.

Cited by 96 publications

References 47 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

Aerogels

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