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Publisher DOI: 10.3390/gels5010012
Title: Porous starch materials via supercritical- and freeze-drying
Language: English
Authors: Baudron, Victor 
Gurikov, Pavel 
Smirnova, Irina 
Whitehouse, Steve 
Keywords: freeze-drying;supercritical drying;aerogel;starch;open cell foam;cryogel;cryogelation
Issue Date: 26-Feb-2019
Publisher: Multidisciplinary Digital Publishing Institute
Source: Gels 5 (1): 12 (2019)
Journal or Series Name: Gels 
Abstract (english): 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.
DOI: 10.15480/882.2111
ISSN: 2310-2861
Other Identifiers: doi: 10.3390/gels5010012
Institute: Thermische Verfahrenstechnik V-8 
Entwicklung und Modellierung neuartiger nanoporöser Materialien V-EXK2 
Type: (wissenschaftlicher) Artikel
Funded by: Nestlé Product Technology Centre York
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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