The Effect of the Amylose/Amylopectin Contents of Starch on Porosity and Dielectric Properties of the Porous Hydroxyapatite/Starch Composites

Autor:	Khor Shing Fhan, Eng Swee Kheng, Nashrul Fazli Mohd Nasir, Cheng Ee Meng, Shahriman Abu Bakar, Mohd Ridzuan Mohd Jamir, Mohd Shukry Abdul Majid, Beh Chong You
Rok vydání:	2020
Předmět:	Permittivity Materials science Retrogradation (starch) Starch food and beverages General Medicine Dielectric chemistry.chemical_compound chemistry Amylose Amylopectin Composite material Porosity Potato starch
Zdroj:	IOP Conference Series: Materials Science and Engineering. 864:012198
ISSN:	1757-899X 1757-8981
Popis:	This study aims to determine the effect of the amylose/amylopectin contents of starch on the porosity and dielectric properties of porous hydroxyapatite/starch composites. The porous hydroxyapatite/starch composites were prepared by utilizing the starches (rice, corn and potato starch) via gelatinization and retrogradation process. The complex permittivity of the porous hydroxyapatite/starch composites were evaluated in the frequency range of 12.4-18.0 GHz. The porous composites were exhibited the higher average porosity by using the starch with higher amylopectin content. The highly porous hydroxyapatite/starch composites with higher amylopectin content show the significant fluctuation peaks (at 13.8 and 16.6 GHz) and the higher imaginary part of the complex permittivity (ε′′) at higher frequency in the dielectric spectrum, respectively. The real (ε′) and imaginary part (ε′′) of the complex permittivity of the porous composites could be enhanced by increasing the average porosity and the amylopectin contents.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::745f9b4b2a84ddf5153d2618ef46aa5d https://doi.org/10.1088/1757-899x/864/1/012198 Zobrazit plný text záznamu