A5083668285- Graphene research and applications
- Carbon Nanotubes in Composites
- Supercapacitor Materials and Fabrication
- Nanopore and Nanochannel Transport Studies
- Advancements in Battery Materials
- Advanced Sensor and Energy Harvesting Materials
- Graphene and Nanomaterials Applications
- Membrane Separation Technologies
- Magnetic Properties of Alloys
- Carbon and Quantum Dots Applications
- Advanced ceramic materials synthesis
- Hydrocarbon exploration and reservoir analysis
- Analytical Chemistry and Sensors
- Advanced battery technologies research
- Hydrogen Storage and Materials
- Magnetic and Electromagnetic Effects
- Thermal Radiation and Cooling Technologies
- Catalytic Processes in Materials Science
- Urban and spatial planning
- Copper Interconnects and Reliability
- Conducting polymers and applications
- Phase Equilibria and Thermodynamics
- Engineering Applied Research
- Nanomaterials and Printing Technologies
- Long-Term Effects of COVID-19
Shinshu University
2019-2024
Ōtani University
2017-2022
A sustainable society requires high-energy storage devices characterized by lightness, compactness, a long life and superior safety, surpassing current battery supercapacitor technologies. Single-walled carbon nanotubes (SWCNTs), which typically exhibit great toughness, have emerged as promising candidates for innovative energy solutions. Here we produced SWCNT ropes wrapped in thermoplastic polyurethane elastomers, demonstrated experimentally that twisted rope composed of these SWCNTs...
Abstract Graphene oxide (GO) is the one of most promising family materials as atomically thin membranes for water-related molecular separation technologies due to its amphipathic nature and layered structure. Here, we show important aspects GO on water adsorption from dynamics (MD) simulations, in-situ X-ray diffraction (XRD) measurements, ex-situ nuclear magnetic resonance (NMR) measurements. Although MD simulations reduced models revealed that flexibility interlayer spacing could be...
The Ar (87.3 K) and N2 (77.4 adsorption isotherms of six non-graphitized carbon blacks are compared to choose the best reference material for an accurate determination surface area porous carbons with subtracting pore effect (SPE) method using high resolution αs-plot. Microporous cannot be used as references SPE since they underestimate area. On other hand, exhibiting capillary condensation external areas. total from at 87.3 K has a stronger dependence on microporosity than that 77.4 K....
Synthesis of high-surface-area graphene oxide for application in next-generation devices is still challenging. In this study, we present a simple and green-chemistry procedure the synthesis oxygen-enriched materials, having very large surface areas compared with those reported powdered graphene-related solids. Using hydrothermal treatment carbon nanohorns by H2O2 oxidant under elevated pressure, progressive creation stable nanomaterial, denoted as open-sensu-shaped (OSSGO) us, observed. This...
Abstract The influence of an applied magnetic field on the formation carbon materials from coal tar pitch is investigated. Under field, crystallites in a mesophase resembling liquid crystals are magnetically oriented during carbonization process. Compared with that under nonmagnetic carbonized strong 10 T, generated by superconducting magnet, has highly structure crystallites. orientation samples prepared 2 which can easily be supplied electromagnet, was insufficient. Activation potassium...
We report a route for opening nanowindows on graphene wall of single carbon nanohorn (SWCNH) aided by copper (II) 2,3,9,10,16,17,23,24-octakis (octyloxy)-29H, 31H-phthalocyanine (CuPc), which acts as catalyst nanowindow formation. CuPc is adsorbed SWCNH from liquid phase and heat treated in oxygen atmosphere to produce the adsorption sites CuPc. The isotherms N2 Ar CuPc-adsorbed heat-treated have low pressure hysteresis. hysteresis gap amount difference between desorption branches reaches...
Soft actuators based on polymers are expected to be used for power sources drive wearable robots which required in a wide range of fields such as medical, care and welfare, because they light weight, flexible quiet. Plasticized PVC gel has large deformation by applying voltage high driving stability the atmosphere is considered suitable candidate material development soft actuator. Then, we proposed two kinds novel constructed like yarn textile using plasticized develop actuator realize...
The controlled production of nanowindows in graphene layers is desirable for the development ultrathin membranes. Herein, we propose a single-atom catalytic oxidation method introducing into single-walled carbon nanotubes (SWCNTs). Using liquid-phase adsorption, copper(II) 2,3,9,10,16,17,23,24-octakis(octyloxy)-29H,31H-phthalocyanine (CuPc) was adsorbed on SWCNT bundles at surface coverage 0.9. Subsequently, narrow with number density 0.13 nm–2 were produced by above 550 K, which higher than...
The fabrication of free-standing single-wall carbon nanotube (SWCNT) film is promising for better understanding SWCNT and many applications. Here we fabricated highly pure crystalline using vacuum high-temperature annealing. Impurities can be removed thoroughly by annealing at 2073 K 10−1 Pa 3 h. Also, the was quite efficient removing nanowindows improving crystallinity film. transmission electron microscopic observation X-ray diffraction confirmed almost no change in average tube diameter...
Abstract Understanding water adsorption/desorption process through nanowindows provides new insights into membrane applications, supercapacitors and elucidation of biological ion separation mechanism. This study evidenced a stochastic desorption mechanism molecules adsorbed inside highly pure single-wall carbon nanotube (SWCNT) nanowindows, which evidently differs from conventional micropores. was clarified by the comparative analysis behaviors on endcap-closed SWCNT having endcap-open...
Nanoscale pores in graphene oxide (GO) control various important functions. The nanoporosity of GO is sensitive to low-temperature heating. Therefore, it carefully process and GO-based materials achieve superior Optimum pretreatment conditions, such as the pre-evacuation temperature time, are during gas adsorption obtain accurate pore structure information. This study demonstrated that time for must be approximately 333-353 K 4 h, respectively, avoid irreversible alteration nanoporosity. In...
The structure of carbon materials can be controlled using a magnetic field, enhancing their functional properties. Most the magnetic-field effects on material growth were found to originate from orientation. However, we observed that orientation did not affect single-walled nanotubes (SWCNTs); instead, under field 10 T, preferential metallic SWCNTs (1-nm diameter) was chemical vapor deposition and liquid decomposition, suggesting chirality selectivity. Raman X-ray photoelectron spectra...
Plasticized poly vinyl chloride (PVC) gel which has a large deformation by applying voltage and high driving stability in the atmosphere is considered as promising material for soft actuator. To fabricate more flexible performance multilayered PVC actuator, this study, we attempt to develop automation technology fabricating thin film used actuator based on digital 3D printing technology. We proposed system examined adjust amount of coating control condition coating. Under 0.06 mg/shot coated...
Designing efficient membranes for gas separation is a challenge future clean energy generation. Here we report graphene-wrapped hydroxyapatite (G-HAP) membrane H2 from CH4 and light hydrocarbons. The pores are prepared by graphene-wrapping HAP crystals containing surface grooves along the c-axis. form 1D channels at graphene–HAP interface. G-HAP achieves permeance of 5.5 × 10–7 mol m–2 s–1 Pa–1 (2.5 105 barrer) selectivity 40.0 H2/CH4. created has derived groove structure that responsible...
The fabrication of free-standing single-wall carbon nanotube (SWCNT) films is promising for better understanding SWCNT and many applications. Here we fabricated highly pure crystalline using vacuum high-temperature annealing. Impurities can be removed completely by annealing at 2073 K 10-1 Pa 3 h. Vacuum improve crystallinity film eliminate nanowindows other defects. Furthermore, the increase in diameter caused suggested to associated with expansion interlayer spacing bundles observed X-ray...
Abstract Physisorption of methane in porous solids has been actively studied to achieve high storage capacity, but it requires heavy vessels due the pressures involved. In addition, physisorption is quite sensitive temperature elevation, even near ambient conditions. We developed a method for high-density at pressure by installing pore-entrance locks controlled waste heat 473 K. Under conditions, entrance are stable enough store large amount highly pressurized carbon nanopores 19.9 MPa and...