Our customer services representatives are available 24 hours a day, from Monday to Sunday.
If you are interested in a quote for a large quantity, please contact us.
Zhu, H., Zhang, C., Tang, Y., Wang, J., Ren, B., & Yin, Y. (2007). Carbon, 45(1), 226-228.
Suspensions containing nanoparticles (nanofluids) have much higher thermal conductivity than the corresponding blank liquid. Therefore, they are considered as the next generation of heat transfer fluids.
Preparation of Graphite Nanoparticle Suspension
The typical preparation method of graphite suspension is as follows: graphite nanopowder is dispersed in a required amount of distilled water, and the pH value of the mixture is adjusted to about 9.5 with aqueous ammonia. 0.5wt% of polyvinyl pyrrolidone (PVP-K30) is added as a dispersant. After the suspension is subjected to ultrasonic vibration for 30 minutes, a graphite suspension is then obtained.
Thermal Conductivity of Graphite Suspension
The thermal conductivity of graphite suspension was measured at room temperature using the transient hot-wire method. In the figure, the thermal conductivity of graphite suspension is a function of graphite nanopowder volume fraction. The reported thermal conductivities of MWCNTs suspensions (at room temperature) are also included for comparison. It can be seen that adding graphite nanoparticles to water significantly increases the thermal conductivity. The reinforcement increases with increasing graphite concentration.
Zhou, Shi-dong, et al. "Effect of graphite nanoparticles on promoting CO2 hydrate formation." Energy & Fuels 28.7 (2014): 4694-4698.
The thermal properties of nanoparticles are the key factors that determine the heat transfer coefficient of the hydrate formation system. Therefore, it is necessary to find materials with high thermal conductivity to promote the formation of hydrates. Here, graphite nanoparticles are selected because of its high heat transfer coefficient and low price among metalloids and oxide nanoparticles.
Effect of Nanographite on Promoting CO2 Hydrate Formation
A series of experiments were conducted under certain conditions, with a hydrate reaction time of 800 min. The results showed that nanographite particles had a positive effect on the formation of hydrates. Compared with pure water, the induction time for hydrate formation in the presence of graphite nanoparticles was reduced by 80.8%, while the maximum CO2 consumption increased by 12.8%. In addition, in the presence of nanographite particles, the hydrate reaction was 98.8% complete within 400 minutes. There is enough reason to believe that these results obtained from CO2 may inspire us to study the effect of graphite nanoparticles on promoting the formation of natural gas hydrates.
Singh, Abhishek, et al. International Journal of Biological Macromolecules 234 (2023): 123724.
Graphite nanopowder was employed as a functional nanofiller in the synthesis of a xanthan gum-diethylene glycol dimethacrylate (DEGDMA)-based biomaterial, aiming at applications in bone defect engineering. The composite material, referred to as XDnGR, was fabricated via a microwave-assisted free-radical polymerization method using benzoyl peroxide (BPO) as the initiator.
Initially, BPO (20 mg) was dissolved in 1 mL DEGDMA, and graphite nanopowder (2 mg) was sonicated separately in an additional 1 mL DEGDMA. The two solutions were combined, stirred, and subsequently mixed with 1 g xanthan gum. The resulting slurry was irradiated at 600 W using a domestic microwave, with 10-second intervals and intermittent cooling to prevent thermal degradation. Post-synthesis, the material was washed in acetone to remove unreacted monomers and dried at 50 °C.
Comprehensive characterization by FTIR, XRD, SEM, and TGA confirmed the successful incorporation of graphite nanopowder into the polymer matrix. Rheological studies indicated that graphite nanopowder significantly enhanced the structural and mechanical integrity of the biomaterial. Furthermore, the composite demonstrated promising drug release behavior, suggesting its potential in controlled therapeutic delivery for bone tissue engineering.
This work highlights graphite nanopowder's role in imparting desirable physicochemical and functional properties to biomedical polymer composites.
Blechta, Václav, et al. Sensors and Actuators B: Chemical 226 (2016): 299-304.
Graphite nanopowder (GNP) has been effectively utilized in the fabrication of a novel amperometric gas sensor with ultrahigh sensitivity towards nitrogen dioxide (NO₂). The sensor architecture integrates graphite nanopowder with graphene and an ionic liquid, forming a hybrid graphene field-effect transistor (GFET) system. GNP acts as the working electrode, while the ionic liquid serves as a solid electrolyte, enabling enhanced signal transduction.
The sensor demonstrated a remarkable response of 90% to 2 ppm NO₂ under synthetic air at 40% relative humidity. Notably, the device exhibited a rapid response time of 40 seconds and a recovery time of less than one minute. A linear correlation between saturation current and NO₂ concentration was observed in the range of 1-5 ppm, with a calibration slope of 0.2 μA/ppm, indicating the sensor's high sensitivity and reliability for low-concentration gas detection.
This configuration capitalizes on the high surface area and excellent electrical conductivity of graphite nanopowder, which enhances electron transfer efficiency and signal amplification. These findings demonstrate the viability of GNP as a key component in next-generation low-cost gas sensors, especially for environmental monitoring applications.
The integration of graphite nanopowder into graphene-based sensing platforms offers a promising approach for the development of fast, sensitive, and scalable gas detection technologies.
Mukherjee, Priya, and Pichiah Saravanan. International Journal of Hydrogen Energy 45.43 (2020): 23411-23421.
Graphite nanopowder (GN) was effectively employed for the preparation of conductive polyvinyl formaldehyde (GN-PVF) sponges, aimed at enhancing anode performance in microbial fuel cells (MFCs). These three-dimensional porous sponges were synthesized using a polyvinyl alcohol (PVA) and GN precursor system, with GN concentrations ranging from 0.5 to 10 wt%. The GN-PVA mixture was polymerized, crosslinked with formaldehyde, and foamed to yield a lightweight, highly conductive sponge.
Further surface functionalization with acrylamide (AM) and subsequent alkaline hydrolysis introduced hydroxyl and amine groups, improving both hydrophilicity and biocompatibility. These modifications significantly increased microbial colonization efficiency and electron transfer in MFCs.
The resulting GN-PVF sponges demonstrated superior electrical conductivity and biocompatibility when compared to commercial graphite felt. Notably, the GN5-PVF sample showed optimal performance, balancing mechanical strength, porosity, and electrochemical activity.
This work highlights the critical role of graphite nanopowder as a conductive filler, enabling tunable electrical properties in macroporous polymeric matrices. The use of GN in this application underscores its versatility in electrochemical device fabrication, particularly for sustainable energy technologies like microbial fuel cells.
Graphite nanopowder thus proves to be a valuable component in designing next-generation, bio-compatible anode materials with enhanced performance for energy-harvesting systems.
Online Inquiry
