Optical and electrical characteristics of carbonized film prepared from coal tar pitch under a high magnetic field of 10 T

Hamasaki, Atom; Fujio, Kazuki; Mori, Takesaburo; Iide, Masashi; Takeuchi, Yahiko; Katsuki, Akio; Ozeki, Sumio

doi:10.1063/1.5095191

Cited by 5 publications

(14 citation statements)

References 25 publications

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“…Coal tar is a by-product produced during the synthesis of coke and coal gas from coal 9 . Coal tar has been used to create useful materials, such as anode materials for lithium-ion batteries 10 , supercapacitor electrodes 11 , optically polarising films 12 , and carbon nanosheets 13 , 14 . The process of synthesising oil from coal on large scales results in a constant supply of coal tar, along with its concomitant by-products including cresols 15 , 16 .…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Hartl

Michl

et al. 2022

Sci Rep

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This work reveals a versatile new method to produce films with antimicrobial properties that can also bond materials together with robust tensile adhesive strength. Specifically, we demonstrate the formation of coatings by using a dielectric barrier discharge (DBD) plasma to convert a liquid small-molecule precursor, m-cresol, to a solid film via plasma-assisted on-surface polymerisation. The films are quite appealing from a sustainability perspective: they are produced using a low-energy process and from a molecule produced in abundance as a by-product of coal tar processing. This process consumes only 1.5 Wh of electricity to create a 1 cm2 film, which is much lower than other methods commonly used for film deposition, such as chemical vapour deposition (CVD). Plasma treatments were performed in plain air without the need for any carrier or precursor gas, with a variety of exposure durations. By varying the plasma parameters, it is possible to modify both the adhesive property of the film, which is at a maximum at a 1 min plasma exposure, and the antimicrobial property of the film against Escherichia coli, which is at a maximum at a 30 s exposure.

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Section: Introductionmentioning

confidence: 99%

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Hartl

Michl

et al. 2022

Sci Rep

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“…The orientation of nanomaterials induced by an electric field can reduce costs while achieving desirable composite properties for different application scenarios. [19][20][21][22][23][24] Although there are also many researches on the improvement of polymer properties after nanomaterials orientation [19,23,25] and many researchers have done in-depth study on the dynamics and mechanical behavior of electric field orientation, [27,34,35] there are still many problems in preparation of composite samples with electric field induced orientation and the expansion of production. When the viscosity of polymer dispersion is too high, it is necessary to apply a sufficiently high electric field strength to overcome the viscous resistance so that the nanomaterials align in the direction of the electric field.…”

Section: Challenges and Prospectsmentioning

confidence: 99%

“…When the oriented CNMs are characterized by POM, TOM or SM, the samples only need ultrasonic dispersion in advance of observation and observations can be made during orientation. [24,29,49] POM and TOM can observe the orientation of transparent and non-transparent materials. However, their short working distances (millimeter magnitude) only allow small samples to be placed on the sample stage.…”

Section: Introductionmentioning

confidence: 99%

“…Common alignment methods [23–25] include mechanical stretching, high‐speed shear, magnetic field‐induced and electric field‐induced orientations. The tensile and shear methods only allow aligning the nanomaterials along the length of the nanocomposite [24] . The magnetic field induced orientation can only be carried out under high magnetic field and often requires modifying low‐magnetic fillers by doping magnetic particles such as Fe 2 O 3 , rending the process complex and time consuming [26–29] .…”

Section: Introductionmentioning

confidence: 99%

“…However, the random orientation of CNMs in the polymer matrix limits the performance of the mechanical, optical and electrical properties of the polymer nanocomposites, [20] whereas the directional alignment of the CNMs considerably improves their energy storage capacities, catalytic properties, electrical conductivities, thermal conductivities and mechanical properties [19,20] . Therefore, the orientation of CNMs in polymer matrices to obtain polymer nanocomposites with excellent properties is a research hotspot [22–24] . Common alignment methods [23–25] include mechanical stretching, high‐speed shear, magnetic field‐induced and electric field‐induced orientations.…”

Section: Introductionmentioning

confidence: 99%

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Electric Field‐induced Orientation of Carbon Nanomaterials in Dispersions

Du,

Zheng,

et al. 2024

ChemistrySelect

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Carbon nanomaterials (CNMs) exhibit excellent performance and potential application value in optical, electric, magnetic and thermal owing to their unique low dimensional structures, high specific surface areas and excellent electrical conductivities, however, the random orientation of CNMs in polymer dispersions negatively affects their optimal performances. Herein, the orientation of CNMs induced by an electric field in dispersions was investigated. The arrangement of carbon black, carbon nanotubes and graphite nanoplatelets in solvents under an electric field was characterized using a stereoscopic microscope. The effects of solvent type, nanomaterial concentration and electric field conditions on the orientation of the CNMs were systematically investigated. The results showed that the CNMs generally exhibited good electric field‐induced orientations in solvents with a low relative dielectric constant. The orientation structure resulting from using an appropriate CNMs concentration was relatively uniform and continuous. In particular, a more regular orientation structure was achieved upon applying an electric field (100 V/mm; 1000 Hz) for 30 s. Interestingly, well‐oriented CNMs in a solvent can also orient in polymer dispersions that are soluble in such a solvent. This extension of the orientation of CNMs from solvents to polymer dispersion systems provides a novel idea for preparing high‐performance composites.

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The graphitization of a highly oriented graphite precursor prepared under a high magnetic field of 6 T

et al. 2021

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Traditional carbon materials such as graphite are currently extremely useful and have recently been applied to cutting-edge materials. However, it is a concern that as production will increase much more in the future, the impact on the environment during preparation will become a problem. Recently, we have succeeded in obtaining an extremely high orientation structure using a carbonization process in a strong magnetic field [“Magnetic orientation of hexagonal carbon layers at high temperature” Chem. Lett. 41, 1576 (2012)]. Because graphite has a two-dimensional structure in which graphene sheets are laminated, we expect that graphitization should be easily performed by using a precursor that originally has an oriented structure. When two types of precursors prepared in the absence and presence of a magnetic field of 6 T were graphitized under the same conditions, graphitization was promoted by 50 to 100 K for the precursor to which a strong magnetic field was applied. If we fabricate products with the same degree of graphitization, it is calculated that the graphitization energy can be suppressed by as much as 10% by using a magnetic field. Applying this technology to the preparation of graphite in industry is proposed to result in substantial energy savings.

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Optical and electrical characteristics of carbonized film prepared from coal tar pitch under a high magnetic field of 10 T

Cited by 5 publications

References 25 publications

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Antimicrobial adhesive films by plasma-enabled polymerisation of m-cresol

Electric Field‐induced Orientation of Carbon Nanomaterials in Dispersions

The graphitization of a highly oriented graphite precursor prepared under a high magnetic field of 6 T

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