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Sustainable approach toward synthesis of green functional carbonaceous 3-D micro/nanostructures from biomass.

Tavangar A, Tan B, Venkatakrishnan K - Nanoscale Res Lett (2013)

Bottom Line: Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved.Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures.These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada. venkat@ryerson.ca.

ABSTRACT
This study proposes a novel technique to synthesize functional carbonaceous three-dimensional (3-D) micro/nanocompounds from agricultural by-products using femtosecond laser irradiation. Biowastes of rice husk and wheat straw are value-engineered to carbonaceous structures in a single-step process under ambient conditions. Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved. Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures. This sustainable approach presents an important step towards synthesizing 3-D micro/nanofibrous compounds from biowaste materials. These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

No MeSH data available.


Related in: MedlinePlus

SEM micrographs of the structures synthesized from rice husks by 2,600 consecutive laser pulses. The laser pulse energies were (a) 0.19, (b) 0.38, and (c) 0.58 mJ.
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Figure 2: SEM micrographs of the structures synthesized from rice husks by 2,600 consecutive laser pulses. The laser pulse energies were (a) 0.19, (b) 0.38, and (c) 0.58 mJ.

Mentions: The morphology and chemical composition of the synthesized structures are influenced by various laser parameters. First, we investigated the effect of pulse energy on the porosity and size of the structures. Figure 2 shows the SEM images of the structure synthesized by ablating rice husk substrates by 2,600 consecutive laser pulses with different pulse energies. A closeup view of the structures produced by pulses with energy of 58 mJ, shown in Figure 2a, shows that they are comprised of self-assembled closed rings and bridges in which nanoparticles are aggregated together. Figure 2b,c depicts the structures synthesized by the same number of pulses but at different pulse energies.


Sustainable approach toward synthesis of green functional carbonaceous 3-D micro/nanostructures from biomass.

Tavangar A, Tan B, Venkatakrishnan K - Nanoscale Res Lett (2013)

SEM micrographs of the structures synthesized from rice husks by 2,600 consecutive laser pulses. The laser pulse energies were (a) 0.19, (b) 0.38, and (c) 0.58 mJ.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3750559&req=5

Figure 2: SEM micrographs of the structures synthesized from rice husks by 2,600 consecutive laser pulses. The laser pulse energies were (a) 0.19, (b) 0.38, and (c) 0.58 mJ.
Mentions: The morphology and chemical composition of the synthesized structures are influenced by various laser parameters. First, we investigated the effect of pulse energy on the porosity and size of the structures. Figure 2 shows the SEM images of the structure synthesized by ablating rice husk substrates by 2,600 consecutive laser pulses with different pulse energies. A closeup view of the structures produced by pulses with energy of 58 mJ, shown in Figure 2a, shows that they are comprised of self-assembled closed rings and bridges in which nanoparticles are aggregated together. Figure 2b,c depicts the structures synthesized by the same number of pulses but at different pulse energies.

Bottom Line: Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved.Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures.These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada. venkat@ryerson.ca.

ABSTRACT
This study proposes a novel technique to synthesize functional carbonaceous three-dimensional (3-D) micro/nanocompounds from agricultural by-products using femtosecond laser irradiation. Biowastes of rice husk and wheat straw are value-engineered to carbonaceous structures in a single-step process under ambient conditions. Our results demonstrate that by controlling the laser fluence, structures with a variety of different morphologies from nanostructures to microstructures can be achieved. Also, the results indicate that altering the laser processing parameters influences the chemical composition of the synthesized structures. This sustainable approach presents an important step towards synthesizing 3-D micro/nanofibrous compounds from biowaste materials. These structures, as-synthesized or as nanocomposite fillers, can have practical uses in electronic, sensing, biological, and environmental applications.

No MeSH data available.


Related in: MedlinePlus