Porous Starch Materials via Supercritical- and Freeze-Drying

Gels
Victor BaudronSteve Whitehouse

Abstract

The production of porous materials based on starch has been explored with supercritical drying-yielding aerogel-and freeze-drying. The two drying procedures were applied on the same gelling solution of amylomaize starch pasted at 140 °C and for two concentrations (5 and 10 wt.%). After gelation and retrogradation, water from the samples to be supercritically dried was exchanged to ethanol. The resulting starch aerogel presented high specific surface area (197 m²/g). Freeze-drying was assessed by investigating the effect of the gelation, retrogradation, freezing temperature, and sublimation pressure. The resulting starch materials were macroporous, with limited specific surface area and limited mechanical integrity. Cohesive open cell foam with pore size of ~20 µm was produced by quenching the hot starch melt in liquid nitrogen. The highest specific surface area obtained with freeze-drying was 7.7 m²/g for the hot starch melt frozen at -20 °C.

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Citations

Dec 11, 2019·Gels·Zachary J Rogers, Sidi A Bencherif
Sep 24, 2020·Gels·Mirelle DogenskiSandra R S Ferreira
Nov 19, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Fernando Alvarado-HidalgoRicardo Starbird-Perez

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Methods Mentioned

BETA
X-ray
scanning electron microscopy

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