Banjuraizah Johar

Preferred name

Banjuraizah Johar

Official Name

Banjuraizah, Johar

Main Affiliation

Universiti Malaysia Perlis

Scopus Author ID

36782257500

Researcher ID

ELA-9787-2022

Research Output

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Dielectric properties of Nephelium Lappaceum tropical wood

( 2020-03-25)
Khor Shing Fhan
;
Cheng Ee Meng
;
Banjuraizah Johar
;
Nashrul Fazli Mohd Nasir
;
Zaizul M.A.
;
Wan Azani Wan Mustafa
;
Nik Noriman Zulkepli
;
Dahham O.S.

Dielectric properties of rambutan wood (Nephelium Lappaceum) were investigated in three anisotropic directions, namely miters-cut, cross-cut, and rib-cut. Dielectric constants and dielectric loss factors were measured at ambient temperatures by using an impedance analyzer. The dielectric constant decreased as frequency increased from 4 to 1 MHz. Among the wood specimens, the rib-cut direction has the lowest dielectric constant, while the cross-cut direction has the highest value. A dielectric dispersion occurred within frequencies 100 Hz to 10 kHz, which corresponding to a relaxation peak as observed on dielectric loss factor spectra. The relaxation peak value of the dielectric loss factors shifted towards higher frequencies in the sequence of rib-cut, miters-cut, and cross-cut specimen. Above 500 Hz, the cross-cut specimen has the highest value conductivity than others. Generally, these variations were subjected to the anatomical structure in the wood, such as parenchyma, ray cell, vessel cell, and fiber cell.