The control of ice crystal growth and effect on porous structure of konjac glucomannan-based aerogels

Ni, Xuewen; Ke, Fan; Xiao, Mi; Wu, Kao; Kuang, Ying; Corke, Harold; Jiang, Fatang

doi:10.1016/j.ijbiomac.2016.08.020

Cited by 78 publications

(49 citation statements)

References 30 publications

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“…Cereal β-glucans are linear homopolysaccharides composed of β-d-glucopyranosyl units linked with (1→3) and (1→4) glycosidic bonds (Figure 8). Regarding thermal-insulated biomaterials, glucomannan materials obtained by supercritical drying have not been reported in the literature, but cryogels obtained by freeze-drying have been widely investigated [94,95]. Incorporation of silica or starch/wheat straw into konjac glucomannan could positively influence the hydrophobicity, mechanical strength, and the thermal insulation property of final biomaterial, which are key parameters in insulated food packaging, i.e., packaging of temperature-sensitive food [96,97].…”

Section: Glucomannansmentioning

confidence: 99%

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Nešić

Cabrera‐Barjas

Dimitrijević-Branković

et al. 2019

Molecules

228

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The use of polysaccharide-based materials presents an eco-friendly technological solution, by reducing dependence on fossil resources while reducing a product's carbon footprint, when compared to conventional plastic packaging materials. This review discusses the potential of polysaccharides as a raw material to produce multifunctional materials for food packaging applications. The covered areas include the recent innovations and properties of the polysaccharide-based materials. Emphasis is given to hemicelluloses, marine polysaccharides, and bacterial exopolysaccharides and their potential application in the latest trends of food packaging materials, including edible coatings, intelligent films, and thermo-insulated aerogel packaging.

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Section: Glucomannansmentioning

confidence: 99%

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Nešić

Cabrera‐Barjas

Dimitrijević-Branković

et al. 2019

Molecules

228

View full text Add to dashboard Cite

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“…As cooling continued, the temperature at the central axis dropped below the freezing point of water. As we know, at high freezing temperatures, the ice crystal growth rate is greater than the nucleation rate; therefore small ice particles were able to grow into big ice crystals, so bigger ice crystals formed in the central axis. After the bigger ice crystals were replaced by air, the bigger tubes were thus formed; this caused the number of tubes per unit volume to decrease in the central axis.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic polyimide aerogels fabricated by directional freezing

Zhang

et al. 2018

J of Applied Polymer Sci

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In this study, we adapted a simple, low‐cost, and environmentally friendly method to fabricate anisotropic polyimide (PI) aerogels. During directional freezing of an aqueous poly(amic acid) ammonium salt solution from the profile to the center axis of the cylindrical mold, the ice crystals preferred to grow along the radial direction of the cylindrical mold. After the ice crystals were sublimated by freeze drying, an anisotropic pore structure was formed in the aerogels. The prepared PI aerogels had lower densities (0.04–0.22 g/cm3) and higher porosities (84–97%) and exhibited anisotropy in both their pore structures and properties. Their compressive modulus and strength in the horizontal direction were both higher than those in the vertical direction, and they also had good compression recovery in the vertical direction. Moreover, their heat‐transfer performance also exhibited anisotropy. The heat transfer in the horizontal direction of the aerogels was much faster than that in the vertical direction. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47179.

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“…At the same position, the pore size of the samples increased as the PAA concentration decreased. As we know, with the temperature raising, the growth rate of ice crystals was greater than their nucleation rate . During the unidirectional freezing process, the temperature gradually raised from the bottom to the top of the mold, so the growth rate of ice crystals increased along the freezing direction.…”

Section: Resuls and Discussionmentioning

confidence: 99%

Fabrication and properties of anisotropic polyimide aerogels with aligned tube‐like pore structure

Chen

et al. 2019

J of Applied Polymer Sci

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Polyimide (PI) aerogels with highly aligned tube‐like pores were fabricated by unidirectional ice crystal‐induced self‐assembly method. During this process, the mold bottom contacted with the freezing medium, the aqueous solution of poly(amic acid) (PAA) ammonium salt in the mold was unidirectionally frozen, the ice crystals grew from the bottom to top of PAA ammonium salt (PAS) solution along the freezing direction, which endowed PI aerogels with aligned tube‐like pores after sublimation of ice crystals and thermal imidization of PAS. The obtained aerogels had low densities (0.077–0.222 g cm−3) and high porosities (83.8–94.2%) and exhibited anisotropic morphology and properties. Their compression strength in vertical direction (parallel to freezing direction) was higher than that in horizontal direction (perpendicular to freezing direction). Their heat transport in horizontal direction was much slower than that in vertical direction; the aerogels had better thermal insulating property in horizontal direction. This facile approach contributed to prepare new type of PI aerogel materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48769.

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The control of ice crystal growth and effect on porous structure of konjac glucomannan-based aerogels

Cited by 78 publications

References 30 publications

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Prospect of Polysaccharide-Based Materials as Advanced Food Packaging

Anisotropic polyimide aerogels fabricated by directional freezing

Fabrication and properties of anisotropic polyimide aerogels with aligned tube‐like pore structure

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