Reduction of electrical resistance on suspended glassy carbon nanofibers by localized thermal annealing

2020 ◽  
Author(s):  
Arnoldo Salazar ◽  
Victor H. Perez-Gonzalez
Keyword(s):  
Carbon Nanofibers ◽  
Thermal Annealing ◽  
Glassy Carbon ◽  
Electrical Resistance

Organization and Compaction of Composite Filler Material Using Acoustic Focusing

2017 ◽  
Author(s):  
Lauren A. Chai ◽  
Brian W. Anthony
Keyword(s):  
Electrical Resistivity ◽  
Carbon Nanofibers ◽  
Electrical Resistance ◽  
Volume Fraction ◽  
Acoustic Radiation ◽  
Mineral Oil ◽  
Acoustic Focusing ◽  
Initial Drop ◽  
Light Mineral ◽  
External Face

Carbon nanofibers in polymer-based composites reduce the electrical resistivity of the composite but can be up to 100 times more expensive than the bulk polymer. This work uses acoustic focusing to organize and compact carbon nanofibers in a mineral oil mixture. The result is a decrease in the composite electrical resistivity without an increase in the global volume fraction of the fibers in the composite and associated material cost. The composite consisted of Pyrograf PR-19-LHT carbon nanofibers mixed in light mineral oil at 1.6% volume fraction carbon nanofibers. The mixture was contained in a 1 cm × 1 cm × 4 cm glass cuvette. A PZT-4 piezoelectric transducer, epoxied to the external face of one of the sidewalls, generated the acoustic radiation forces in the container. A 1.179 MHz sinusoidal signal powered the transducer, producing a standing wave with 27 nodes and 13 antinodes in the container. A digital multimeter performed the 2-wire resistance measurement before, during and after focusing. Settling of the filler due to gravity resulted in an initial drop in the electrical resistance. Once the mixture reached steady state, toggling the signal power off and on also toggled the approximate electrical resistance between the 19.2 MOhms and 11.5 MOhms respectively. This work also presents a simple volume fraction model, which predicted that the focused resistance would be 34% of the unfocused value. In the experiment, acoustic focusing reduced the electrical resistance to 60% of the resistance in the unfocused mixture, demonstrating acoustic focusing as a method for reducing electrical conductivity within a composite.

scholarly journals Sub-10 nm nanogap fabrication on suspended glassy carbon nanofibers

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Arnoldo Salazar ◽  
Samira Hosseini ◽  
Margarita Sanchez-Domínguez ◽  
Marc. J. Madou ◽  
Alejandro Montesinos-Castellanos ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Glassy Carbon

Glassy carbon nanofibers from electrospun cellulose nanofiber

2014 ◽  
Vol 50 (2) ◽  
pp. 563-569 ◽  
Author(s):  
Yingying Liu ◽  
Wang Qin ◽  
Qiaoying Wang ◽  
Ruilai Liu ◽  
Haiqing Liu
Keyword(s):  
Carbon Nanofibers ◽  
Glassy Carbon ◽  
Cellulose Nanofiber

Fabrication of carbon nanofibers using only ion beam irradiation to glassy carbon

2011 ◽  
Vol 88 (8) ◽  
pp. 1832-1835
Author(s):  
Takashi Okumoto ◽  
Jun Taniguchi ◽  
Yasuhiro Kamiya
Keyword(s):  
Carbon Nanofibers ◽  
Glassy Carbon ◽  
Ion Beam ◽  
Beam Irradiation ◽  
Ion Beam Irradiation

scholarly journals Carbon materials for the electrooxidation of nucleobases, nucleosides and nucleotides toward cytosine methylation detection: a review

2016 ◽  
Vol 8 (4) ◽  
pp. 702-715 ◽  
Author(s):  
Ariadna Brotons ◽  
Francisco J. Vidal-Iglesias ◽  
José Solla-Gullón ◽  
Jesús Iniesta
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
Glassy Carbon ◽  
Cytosine Methylation ◽  
Carbon Materials ◽  
Boron Doped Diamond ◽  
Boron Doped

The application of different carbon materials such as graphite, glassy carbon, boron-doped diamond, carbon nanofibers, carbon nanotubes and graphene for the electrooxidation of DNA-related molecules toward cytosine methylation electroanalytical monitoring is reviewed.

scholarly journals Electro-conductive carbon nanofibers containing ferrous sulfate for bone tissue engineering

2020 ◽  
Author(s):  
Houra Nekounam ◽  
Hadi Samadian ◽  
Fatemeh Asghari ◽  
Reza Faridi Majidi
Keyword(s):  
Heat Treatment ◽  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Carbon Nanofibers ◽  
Electrical Resistance ◽  
Ferrous Sulfate ◽  
Electrical Resistance Measurement ◽  
O 15

AbstractThe application of electroactive scaffolds can be promising for bone tissue engineering applications. In the current paper, we aimed to fabricate an electro-conductive scaffold based on carbon nanofibers (CNFs) containing ferrous sulfate. FeSO4·7H2O salt with different concentrations 5, 10, and 15 wt%, were blended with polyacrylonitrile (PAN) polymer as the precursor and converted to Fe2O3/CNFs nanocomposite by electrospinning and heat treatment. The characterization was conducted using SEM, EDX, XRD, FTIR, and Raman methods. The results showed that the incorporation of Fe salt did not induce an adverse effect on the nanofibers’ morphology. EDX analysis confirmed that the Fe are uniformly dispersed throughout the CNF mat. FTIR spectroscopy showed the interaction of Fe salt with PAN polymer. Raman spectroscopy showed that the incorporation of FeSO4·7H2O reduced the ID/IG ratio, indicating more ordered carbon in the synthesized nanocomposite. Electrical resistance measurement depicted that, although the incorporation of ferrous sulfate reduced the electrical conductivity, the conductive is suitable for electrical stimulation. The in vitro studies revealed that the prepared nanocomposites were cytocompatible and only negligible toxicity (less than 10%) induced by CNFs/Fe2O3 fabricated from PAN FeSO4·7H2O 15%. These results showed that the fabricated nanocomposites could be applied as the bone tissue engineering scaffold.

A carbon nanofibers–Sm2O3 nanocomposite: a novel electrochemical platform for simultaneously detecting two isomers of dihydroxybenzene

2018 ◽  
Vol 10 (16) ◽  
pp. 1852-1862 ◽  
Author(s):  
Jiahong He ◽  
Fen Qiu ◽  
Qiang Xu ◽  
Jibin An ◽  
Ri Qiu
Keyword(s):  
Catalytic Activity ◽  
Specific Surface ◽  
Surface Area ◽  
Carbon Nanofibers ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Aqueous Environment ◽  
Carbon Electrode ◽  
Large Specific Surface Area ◽  
Modified Glassy Carbon Electrode

In this report, a CNFs-Sm2O3 nanocomposite modified glassy carbon electrode (CNFs-Sm2O3/GCE), comprising CNFs with a large specific surface area and Sm2O3 with excellent catalytic activity, is prepared as a novel sensor for simultaneously detecting hydroquinone (HQ) and catechol (CC) in an aqueous environment.

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