Dielectric Properties of Typical Australian Wood-Based Biomass Materials at Microwave Frequency

Ramasamy, Shanmuganathan; Moghtaderi, Behdad

doi:10.1021/ef100623e

Cited by 46 publications

(28 citation statements)

References 33 publications

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“…It was expected that the moisture content largely affects dielectric properties. The free moisture in biomass contributes in the interaction between biomass and electromagnetic fields [12]. In the present study, dielectric constant of the three fibre directions were positively correlated with OPT core moisture content as showed in Fig.…”

supporting

confidence: 64%

“…The molecules absorb the energy and store as potential energy. By the mechanism of ionic conduction and dipole rotation, polar molecules vibrate and produce kinetic energy [12].…”

Section: Introductionmentioning

confidence: 99%

“…Each type of energy is specified with its term. Dielectric constant (ε') is the ability of material to store electric energy [12]. Dielectric loss (ε") is the ability of material to convert the electromagnetic energy into heat [13].…”

Section: Introductionmentioning

confidence: 99%

“…j is the numerical symbol representing the imaginary part of a complex number [12]. Loss tangent is the ratio of dielectric loss to dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

“…The molecules absorb the energy and store as potential energy. By the mechanism of ionic conduction and dipole rotation, polar molecules vibrate and produce kinetic energy [12].Dielectric properties can be studied on the energy that is reflected, transmitted through the surface and absorbed by the materials. Each type of energy is specified with its term.…”

mentioning

confidence: 99%

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Dielectric Properties of Oil Palm Trunk Core

Jie¹,

Abdullah²,

Yusof³

et al. 2015

JOCET

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Abstract-Recent development in microwave-assisted processing of biomass materials has significantly created a need for fundamental study to understand the dielectric properties of these biomass feedstock, which could give further insight about interaction between microwave energy and biomass. In the present study, dielectric properties of oil palm trunk (OPT) core were investigated using an open-ended coaxial probe method. The dielectric properties of OPT core were determined as a function of controlling factors such as microwave frequency, biomass moisture content and fibre directions (radial, tangential and cross section). The results showed that dielectric constant of OPT core was decreased with the increasing of frequency. For dielectric loss and loss tangent, a similar trend was observed but only at low frequency (<1.8 GHz). The dielectric constant and loss of OPT core were positively correlated with its moisture content for all fibre directions. In terms of magnitude of dielectric constant and loss, radial direction showed the highest value compared to cross section and tangential which suggests radial direction has the optimum electromagnetic energy absorption and conversion.Index Terms-Oil palm trunk core, dielectric constant, dielectric loss, loss tangent. I. INTRODUCTIONAs main exporter of oil palm, Malaysia has a large area of oil palm plantation. Until December 2012, there were 5.08 million ha area of oil palm plantation covering 15% of the total land area in Malaysia [1]. Oil palm tree has short productivity life span about 25 years. During replanting, it is estimated that around 74 t/ha dry oil palm trunk (OPT) logs are produced giving availability of around 13.6 million OPT logs/year for every 100,000 hectares plantations [2]. The abundant OPT logs are mostly utilized in saw-wood, lumber, plywood, flooring and furniture manufacturing [3], [4]. In the manufacturing of plywood, only the outer part of OPT logs was peeled to be further processed into plywood while the core part comprised only soft parenchyma tissue was left out as waste [5]. The core waste could be converted into cattle feed or further processed into biofuel.For waste conversion of biomass into biofuel and materials, microwave-assisted processes such as microwavepyrolysis and microwave-drying are increasingly applied [2], [6]- [8]. Unlike conventional heat source, microwave energy has several advantageous including volumetric heating allowing bulky and high moisture biomass to be processed, minimize secondary reaction to optimize product yield also permits rapid heating therefore cost and time-saving [6] [11]. The mechanism of microwave energy on biomass involves the transport of the electrical charges by the ions present in the biomass cell wall and cellulose. Once the microwave is encountered the biomass, randomly oriented dipoles in dielectric material align themselves in a direction opposite to applied external electric field. The molecules absorb the energy and store as potential energy. By the mechanism of ionic conduction and d...

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supporting

confidence: 64%

“…The molecules absorb the energy and store as potential energy. By the mechanism of ionic conduction and dipole rotation, polar molecules vibrate and produce kinetic energy [12].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…j is the numerical symbol representing the imaginary part of a complex number [12]. Loss tangent is the ratio of dielectric loss to dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Dielectric Properties of Oil Palm Trunk Core

Jie¹,

Abdullah²,

Yusof³

et al. 2015

JOCET

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The microwave pyrolysis of biomass

Macquarrie

Clark

Fitzpatrick

2012

Biofuels Bioprod Bioref

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Microwave pyrolysis of various biomass types has been reviewed. A range of biomass types has been subjected to microwave pyrolysis under various conditions, with char, bio‐oil, and a range of gases (predominantly CO2, CO, CH4 and H2) being produced. Studies aimed at individual biomass components, such as cellulose and hemicellulose, are included to develop a mechanistic understanding of the processes involved.

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Dielectric and mechanical properties of various species of Madagascan woods

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Abstract The low-temperature molecular mobility of three different wood species was analyzed, with the two major constituents-cellulose and lignin-as reference. Mechanical and dielectric dynamic techniques were used. In order to observe the fine structure of the broad relaxation modes of wood, a very low-frequency analysis was carried out by thermostimulated current technique. Low-temperature relaxations of rosewood were assigned to low-temperature relaxations of cellulose. There was no dielectric response of lignin in rosewood. Contrarily, both cellulose and lignin responses were distinguished in ebony and varongy. Thermostimulated currents analyses exhibit the specific behavior of lignin in the various wood species. Moreover, the relaxation mode of cellulose observed at lower temperature remains localized in rosewood, while it tends to delocalize in varongy and ebony. The nature and intensity of physical interactions that induce variation of phase miscibility might be responsible for the observed differences. Even at the scale of the c relaxation, physical interactions modify molecular mobility.

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Dielectric Properties of Typical Australian Wood-Based Biomass Materials at Microwave Frequency

Cited by 46 publications

References 33 publications

Dielectric Properties of Oil Palm Trunk Core

Dielectric Properties of Oil Palm Trunk Core

The microwave pyrolysis of biomass

Dielectric and mechanical properties of various species of Madagascan woods

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