Carbon materials derived from rice husks at low and high temperatures

Melvin, Gan Jet Hong; Wang, Z; Siambun, Nancy J.; Rahman, Md. Mizanur

doi:10.1088/1757-899x/217/1/012017

Cited by 11 publications

(15 citation statements)

References 16 publications

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“…Up to today, several sources have been treated at high temperatures and they exhibited unique structures and morphologies. For instance, high purity and crystallinity of multilayer graphene can be obtained from rice husks treated at high temperature . Furthermore, sources such as fullerene waste soot, wood charcoal, and grounded graphite treated at high temperatures showed that graphite whiskers (GWs) can be formed.…”

Section: Raman Information Of Gws Cg Area Pgs and Slg Based On Figmentioning

confidence: 99%

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Graphite Whiskers Derived from Waste Coffee Grounds Treated at High Temperature

et al. 2019

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Graphite whiskers (GWs) are obtained from coffee grounds (CGs) treated at 2500 °C for 1 h in the presence of Ar gas at 1 atm. The majority of the GWs formed inside the CGs shell are rod‐like with a conical tip with diameter and length in the range between 1 to 3 µm and 4 to 10 µm, respectively. At first, the carbon layer might be grown in a turbostratic manner, and then progressively graphitized at higher temperature. The strong G′ peak intensity might be induced by the disclination of graphitized carbon layers.

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Section: Raman Information Of Gws Cg Area Pgs and Slg Based On Figmentioning

confidence: 99%

“…

temperature. [3] Furthermore, sources such as fullerene waste soot, [4] wood charcoal, [5] and grounded graphite [6] treated at high temperatures showed that graphite whiskers (GWs) can be formed. GWs that can be obtained from waste materials are interesting in the term to reutilize them in order to fabricate new products.

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confidence: 99%

Graphite Whiskers Derived from Waste Coffee Grounds Treated at High Temperature

et al. 2019

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“…From Figure e, d = 0.25 nm is corresponds to SiC . From our previous study and other reports, CRH800 are amorphous carbon with porous structure, and the contents included silica (SiO 2 ) . Meanwhile, CRH2200 contain graphitized carbon materials and mostly SiC particles .…”

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confidence: 71%

“…RH is an agro-based lignocellulosic waste material that is abundant in various countries, mainly generated from rice milling activities. [10][11][12] In year 2016, based on the report from Food and Agriculture Organization of the United Nations (FAO), world rice production is ≈741 million tons. RH is accountable for around 20% from the rice production, which is ready to be utilized.…”

Section: Doi: 101002/gch2201900045mentioning

confidence: 99%

“…To the best of our knowledge, the EM wave absorption performance of rice husk (RH) carbonized at high temperatures which produced heterogeneous materials including carbon materials and ceramic materials (silicon carbide whiskers and particles) has not been reported before. RH is an agro‐based lignocellulosic waste material that is abundant in various countries, mainly generated from rice milling activities . In year 2016, based on the report from Food and Agriculture Organization of the United Nations (FAO), world rice production is ≈741 million tons.…”

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confidence: 99%

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Electromagnetic Wave Absorption Performance of Carbonized Rice Husk Obtained at Various Temperatures

Melvin

Wang

2019

Global Challenges

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Agricultural wastes such as rice husks (RHs) are valuable due to their feasibility to be converted into carbon materials, low cost, and abundancy in contrast to the conventional carbon material sources. In this study, RHs are carbonized at various temperatures from low to high temperatures, and their electromagnetic (EM) wave absorption properties are evaluated. Carbon materials, silicon carbide (SiC) whiskers, and SiC particles are obtained from RHs carbonized at 1500 °C (CRH1500) for 0.5 h with presence of Ar gas at 1 atm. In order to evaluate their EM wave absorption performance, complex permittivity and permeability are measured by using vector network analyzer, and the values are utilized in the reflection loss (R.L.) calculation according to the transmission line theory. CRH1500, 40 wt% with thickness of 1.6 mm exhibits minimum R.L. of ≈−55.4 dB (>99.9997% absorption) at 11.37 GHz and response bandwidth (R.L. < 10 dB, > 90% absorption) of 4.21 GHz. Low‐cost and abundant RHs, carbonized at various temperatures, show significant absorption performance. Their absorption performance and response bandwidth are highly dependent on matching thickness, indicating that they can be easily modulated for promising electromagnetic wave absorber materials.

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