Universität zu Köln

Quester, Silke, Klemmer, H. F. M. and Strey, R. (2017). Towards gliadin nanofoams. Colloid Polym. Sci., 295 (1). S. 267 - 276. NEW YORK: SPRINGER. ISSN 1435-1536

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Abstract

Bio-derived, fully biodegradable closed-cell micro- and nanocellular foams were generated from gliadin. Gliadin, an abundantly available wheat storage protein, was extracted with aqueous ethanol from wheat gluten. For the newly developed foaming process, dry gliadin powder was plasticized by equal volumes of water and ethanol resulting in a viscoelastic paste that was then subjected to supercritical carbon dioxide in a high-pressure cell. After tempering, a sudden release of pressure and cooling resulted in closed-cell micro- or nanocellular foams. Depending on the processing parameters such as the foaming temperature, pressure, pressure drop rate, plasticizer concentration, and pre- and past-expansion treatment, foam morphology was tunable. Accordingly, cell size and porosity can be varied as desired. The resulting foams and intermediate states were analyzed by scanning electron microscopy, and a foaming mechanism is suggested. The foams prepared via the proposed procedure exhibit the smallest cell sizes and the highest porosity ever reported for foaming of wheat proteins. For example, we found mean cell size of 6.5 +/- 1.7 mu m at a porosity of I center dot = 0.97, 1.4 +/- 0.5 mu m at I center dot = 0.90, 720 +/- 340 nm at I center dot = 0.77, and 270 +/- 110 nm at I center dot = 0.62. The procedure presented is clean, environment friendly, simple, and low cost, possibly lending itself to a technical realization. The promising new approach may have potential in short purpose packaging or insulation at almost zero environmental cost, because the materials are easily and environmentally friendly recyclable and even edible.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Quester, Silke UNSPECIFIED UNSPECIFIED UNSPECIFIED Klemmer, H. F. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strey, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-247815
DOI:	10.1007/s00396-016-3995-3
Journal or Publication Title:	Colloid Polym. Sci.
Volume:	295
Number:	1
Page Range:	S. 267 - 276
Date:	2017
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1435-1536
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WHEAT GLUTEN; MECHANICAL-PROPERTIES; RE-POLYMERIZATION; MOLECULAR-BASIS; FOAMS; DEPOLYMERIZATION; STABILITY Multiple languages Chemistry, Physical; Polymer Science Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24781