Improved Direct Electrochemistry for Proteins Adsorbed on a UV/Ozone-Treated Carbon Nanofiber Electrode

Dense [boron carbide (B4C)]/[carbon nanomaterials] composites were synthesized and sintered simultaneously using pulsed electric-current pressure sintering (PECPS) at 2173 K for 6.0×102 s (10 min) under 50 MPa in a vacuum. The starting powders were amorphous B and C nanopowders and nanocarbons. The latter were acid-treated carbon nanofiber CNF and carbon nanotube CNT. The sintered composites were evaluated from the viewpoints of mechanical properties at high temperatures up to ~ 2023 K in inert atmosphere. Thus fabricated composites with 10vol%CNF maintained high bending strength σb around 750 MPa even at 1973 K; this temperature is 100 K higher than that of conventional B4C/CNF composites, and furthermore 600 MPa at 2023 K. These high σb at elevated temperatures might be explained by both the low content of catalytic Fe particles and the rough surface of CNF after the acid-treatment. On the other hand, B4C/CNT composites displayed 770 MPa at 1723 K. The stress-strain curves demonstrate that B4C/CNF composite deformed elastically until 1273 K and plastically up to 1973 K, however, the B4C/CNT composites displayed elastic deformation up to around 1873 K.

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Synthesis of nitrogen-doped plasma treated carbon nanofiber as an efficient electrode for symmetric supercapacitor

Journal of Energy Storage ◽

10.1016/j.est.2020.102150 ◽

2021 ◽

Vol 33 ◽

pp. 102150

Author(s):

Gyawali Ghanashyam ◽

Hae Kyung Jeong

Keyword(s):

Carbon Nanofiber ◽

Nitrogen Doped ◽

Symmetric Supercapacitor ◽

Treated Carbon

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Fabrication and mechanical properties of high-dispersion-treated carbon nanofiber/alumina composites

Journal of the Ceramic Society of Japan ◽

10.2109/jcersj2.118.847 ◽

2010 ◽

Vol 118 (1381) ◽

pp. 847-854 ◽

Cited By ~ 14

Author(s):

Naoki UEDA ◽

Tomohiko YAMAKAMI ◽

Tomohiro YAMAGUCHI ◽

Kunio KITAJIMA ◽

Yuki USUI ◽

...

Keyword(s):

Mechanical Properties ◽

Carbon Nanofiber ◽

High Dispersion ◽

Alumina Composites ◽

Treated Carbon

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Plasma treated carbon nanofiber for flexible supercapacitors

Journal of Energy Storage ◽

10.1016/j.est.2021.102806 ◽

2021 ◽

Vol 40 ◽

pp. 102806

Author(s):

Gyawali Ghanashyam ◽

Hae Kyung Jeong

Keyword(s):

Carbon Nanofiber ◽

Flexible Supercapacitors ◽

Treated Carbon

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Enhancing the power generation of Rhodopseudomonas palustris-based MFC

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209444 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 1261-1268

Author(s):

Shu Otani ◽

Dang-Trang Nguyen ◽

Kozo Taguchi

Keyword(s):

Activated Carbon ◽

Rhodopseudomonas Palustris ◽

Ozone Treatment ◽

Maximum Power Density ◽

On Demand ◽

Long Time ◽

Dry Conditions ◽

Carbon Sheet ◽

Uv Ozone

In this study, a portable and disposable paper-based microbial fuel cell (MFC) was fabricated. The MFC was powered by Rhodopseudomonas palustris bacteria (R. palustris). An activated carbon sheet-based anode pre-loaded organic matter (starch) and R. palustris was used. By using starch in the anode, R. palustris-loaded on the anode could be preserved for a long time in dry conditions. The MFC could generate electricity on-demand activated by adding water to the anode. The activated carbon sheet anode was treated by UV-ozone treatment to remove impurities and to improve its hydrophilicity before being loaded with R. palustris. The developed MFC could generate the maximum power density of 0.9 μW/cm2 and could be preserved for long-term usage with little performance degradation (10% after four weeks).

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Cytocompatibility of Carbon Nanofiber Materials for Neural Applications

MRS Proceedings ◽

10.1557/proc-774-o7.35 ◽

2003 ◽

Vol 774 ◽

Author(s):

Janice L. McKenzie ◽

Michael C. Waid ◽

Riyi Shi ◽

Thomas J. Webster

Keyword(s):

Carbon Fiber ◽

Surface Energy ◽

Carbon Nanofibers ◽

Carbon Fibers ◽

Carbon Nanofiber ◽

Fiber Composite ◽

Scar Tissue ◽

Pc 12 Cells ◽

Low Surface Energy ◽

Poly Carbonate

AbstractSince the cytocompatibility of carbon nanofibers with respect to neural applications remains largely uninvestigated, the objective of the present in vitro study was to determine cytocompatibility properties of formulations containing carbon nanofibers. Carbon fiber substrates were prepared from four different types of carbon fibers, two with nanoscale diameters (nanophase, or less than or equal to 100 nm) and two with conventional diameters (or greater than 200 nm). Within these two categories, both a high and a low surface energy fiber were investigated and tested. Astrocytes (glial scar tissue-forming cells) and pheochromocytoma cells (PC-12; neuronal-like cells) were seeded separately onto the substrates. Results provided the first evidence that astrocytes preferentially adhered on the carbon fiber that had the largest diameter and the lowest surface energy. PC-12 cells exhibited the most neurites on the carbon fiber with nanodimensions and low surface energy. These results may indicate that PC-12 cells prefer nanoscale carbon fibers while astrocytes prefer conventional scale fibers. A composite was formed from poly-carbonate urethane and the 60 nm carbon fiber. Composite substrates were thus formed using different weight percentages of this fiber in the polymer matrix. Increased astrocyte adherence and PC-12 neurite density corresponded to decreasing amounts of the carbon nanofibers in the poly-carbonate urethane matrices. Controlling carbon fiber diameter may be an approach for increasing implant contact with neurons and decreasing scar tissue formation.

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Cytocompatibility and Material Properties of Poly-carbonate Urethane/Carbon Nanofiber Composites for Neural Applications

MRS Proceedings ◽

10.1557/proc-774-o7.30 ◽

2003 ◽

Vol 774 ◽

Author(s):

Janice L. McKenzie ◽

Michael C. Waid ◽

Riyi Shi ◽

Thomas J. Webster

Keyword(s):

Mechanical Properties ◽

Carbon Nanofibers ◽

Material Properties ◽

Carbon Nanofiber ◽

Scar Tissue ◽

Tissue Response ◽

Positive Interactions ◽

Weight Percentage ◽

Poly Carbonate

AbstractCarbon nanofibers possess excellent conductivity properties, which may be beneficial in the design of more effective neural prostheses, however, limited evidence on their cytocompatibility properties exists. The objective of the present in vitro study was to determine cytocompatibility and material properties of formulations containing carbon nanofibers to predict the gliotic scar tissue response. Poly-carbonate urethane was combined with carbon nanofibers in varying weight percentages to provide a supportive matrix with beneficial bulk electrical and mechanical properties. The substrates were tested for mechanical properties and conductivity. Astrocytes (glial scar tissue-forming cells) were seeded onto the substrates for adhesion. Results provided the first evidence that astrocytes preferentially adhered to the composite material that contained the lowest weight percentage of carbon nanofibers. Positive interactions with neurons, and, at the same time, limited astrocyte functions leading to decreased gliotic scar tissue formation are essential for increased neuronal implant efficacy.

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