American Journal of Materials Science and Engineering
ISSN (Print): 2333-4665 ISSN (Online): 2333-4673 Website: http://www.sciepub.com/journal/ajmse Editor-in-chief: Dr. SRINIVASA VENKATESHAPPA CHIKKOL
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American Journal of Materials Science and Engineering. 2019, 7(1), 1-6
DOI: 10.12691/ajmse-7-1-1
Open AccessArticle

Physico-Chemical Behavior of Glycerol-Coated Cassava Starch Gels Incorporating Kaolin and Metakaolin

Namory Meite1, , Léon Koffi Konan1, , Bi Irie Hervé Goure Doubi2, Doudjo Soro3, Iuliana Mihaela Lazar4 and Samuel Oyetola1

1Laboratory of Materials Inorganic Chemistry, Felix Houphouet Boigny University, 22 Po box 582 Abidjan, Côte d’Ivoire

2Unit for training and research of Biological Sciences, Peleforo Gon Coulibaly University, Po box 1328 Korhogo, Côte d’Ivoire

3Laboratory of Industrial Processes, Synthesis, Environment and New Energies (LAPISEN), National Institute Polytechnic Houphouet Boigny (INP-HB) of Yamoussoukro, BP 1093 Yamoussoukro, Côte d'Ivoire

4Department of Environmental and Mechanical Engineering, Vasile Alecsandri University of Bacau, Calea Marasesti 157, 600115, Bacau, Romania

Pub. Date: January 28, 2019

Cite this paper:
Namory Meite, Léon Koffi Konan, Bi Irie Hervé Goure Doubi, Doudjo Soro, Iuliana Mihaela Lazar and Samuel Oyetola. Physico-Chemical Behavior of Glycerol-Coated Cassava Starch Gels Incorporating Kaolin and Metakaolin. American Journal of Materials Science and Engineering. 2019; 7(1):1-6. doi: 10.12691/ajmse-7-1-1

Abstract

This study aims at analyzing the physico-chemical interactions in glycerol-coated cassava starch gels incorporating clay as mineral filler during heating. The physico-chemical and structural characterization of the clay used is composed of 75% kaolinite, 14% quartz and 11% illite. A thermal treatment at 700°C for 1 hour of this kaolinitic clay has allowed strong destructuring of the crystalline structure. The suspensions of glycerol plasticized cassava starch without charge or containing 5% by weight of clay were prepared and then heated at various temperatures between 30°C and 100°C. The suspensions viscosity increases according to the temperature up to a maximum following the penetration of the water molecules inside the starch grains. This phase is followed immediately by a sharp drop in the viscosity, resulting in a granular destructuring and solubilization of the starch grains. The suspensions incorporating metakaolin have a higher viscosity than those incorporating kaolin. The gels incorporating metakaolin have a hight ability to downgrade. The infrared spectroscopy of gels taken at different temperatures show the formation of the inter and intra molecular bonds within the starch granules.

Keywords:
bioplastic starch viscosity metakaolin

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