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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

EDS analyses of unprocessed wheat straws and synthesized structures. (a) Unprocessed wheat straws and (b) structures synthesized from wheat straws by 2,600 consecutive laser pulses with pulse energy of 0.19 mJ.
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Figure 6: EDS analyses of unprocessed wheat straws and synthesized structures. (a) Unprocessed wheat straws and (b) structures synthesized from wheat straws by 2,600 consecutive laser pulses with pulse energy of 0.19 mJ.

Mentions: EDS analyses in FiguresĀ 5 and 6 compare the composition changes of the structures synthesized by 2,600 consecutive laser pulses at pulse energies of 0.19, 0.38, and 0.58 mJ on rice husk and at pulse energy of 0.19 mJ on wheat straw, respectively. Since the experiments have been carried out at ambient conditions, the presence of oxygen is noticeable in the EDS graphs. For the unprocessed rice husk and structures synthesized at lower laser pulse energies, silicon and other inorganic elements are not detectable or barely detectable due to a high amount of organic compounds on the substrates. On the other hand, at higher laser pulse energies, the organic part might be burned away partially, so the other inorganic elements could be distinguished. Comparing the unprocessed and the processed structures, one can note that elements, such as chlorine, which are not in favor, has been removed for rice husk samples after laser ablation.


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

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

EDS analyses of unprocessed wheat straws and synthesized structures. (a) Unprocessed wheat straws and (b) structures synthesized from wheat straws by 2,600 consecutive laser pulses with pulse energy of 0.19 mJ.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: EDS analyses of unprocessed wheat straws and synthesized structures. (a) Unprocessed wheat straws and (b) structures synthesized from wheat straws by 2,600 consecutive laser pulses with pulse energy of 0.19 mJ.
Mentions: EDS analyses in FiguresĀ 5 and 6 compare the composition changes of the structures synthesized by 2,600 consecutive laser pulses at pulse energies of 0.19, 0.38, and 0.58 mJ on rice husk and at pulse energy of 0.19 mJ on wheat straw, respectively. Since the experiments have been carried out at ambient conditions, the presence of oxygen is noticeable in the EDS graphs. For the unprocessed rice husk and structures synthesized at lower laser pulse energies, silicon and other inorganic elements are not detectable or barely detectable due to a high amount of organic compounds on the substrates. On the other hand, at higher laser pulse energies, the organic part might be burned away partially, so the other inorganic elements could be distinguished. Comparing the unprocessed and the processed structures, one can note that elements, such as chlorine, which are not in favor, has been removed for rice husk samples after laser ablation.

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