NDLI: Evaporation-based method for preparing gelatin foams with aligned tubular pore structures.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Frazier, Shane D. Srubar, Wil V.
Description	Country affiliation: United States Author Affiliation: Frazier SD ( Department of Civil, Environmental, and Architectural Engineering, Materials Science and Engineering Program, 1111 Engineering Drive, ECOT 441 UCB 428, University of Colorado Boulder, Boulder, CO 80309, USA.); Srubar WV ( Department of Civil, Environmental, and Architectural Engineering, Materials Science and Engineering Program, 1111 Engineering Drive, ECOT 441 UCB 428, University of Colorado Boulder, Boulder, CO 80309, USA. Electronic address: wsrubar@colorado.edu.)
Abstract	Gelatin-based foams with aligned tubular pore structures were prepared via liquid-to-gas vaporization of tightly bound water in dehydrated gelatin hydrogels. This study elucidates the mechanism of the foaming process by investigating the secondary (i.e., helical) structure, molecular interactions, and water content of gelatin films before and after foaming using X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry and thermogravimetric analysis (TGA), respectively. Experimental data from gelatin samples prepared at various gelatin-to-water concentrations (5-30 wt.%) substantiate that resulting foam structures are similar in pore diameter (approximately 350 µm), shape, and density (0.05-0.22 g/cm(3)) to those fabricated using conventional methods (e.g., freeze-drying). Helical structures were identified in the films but were not evident in the foamed samples after vaporization (~150 °C), suggesting that the primary foaming mechanism is governed by the vaporization of water that is tightly bound in secondary structures (i.e., helices, ß-turns, ß-sheets) that are present in dehydrated gelatin films. FTIR and TGA data show that the foaming process leads to more disorder and reduced hydrogen bonding to hydroxyl groups in gelatin and that no thermal degradation of gelatin occurs before or after foaming.
File Format	HTM / HTML
ISSN	09284931
Journal	Materials Science and Engineering: C
Volume Number	62
e-ISSN	18730191
Language	English
Publisher	Elsevier
Publisher Date	2016-05-01
Publisher Place	Netherlands
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Biomaterials Condensed Matter Physics Bioengineering Mechanical Engineering

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