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Ulsan, South Korea

Zhu L.,Hanseo University | Meng Z.-D.,Hanseo University | Chen M.-L.,Hanseo University | Choi J.-G.,Hanseo University | And 4 more authors.
Asian Journal of Chemistry | Year: 2012

A colloidal suspension of carbonaceous nanomaterials for heat exchangers has attracted increasing research attention. In this study, a simple route used to synthesize lithium treated carbonaceous nanomaterials was studied. The dispersion effect, electrical conductivity, thermophysical properties of the Li-carbon-nanocolloids system were introduced and discussed. The results show that these properties were largely enhanced, which could be due to not only the outstanding physical and electrical properties of the carbon nanomaterials but also to the introduction of lithium ions. Source


Oh W.-C.,Hanseo University | Wang Y.-L.,Hefei University | Lee S.-C.,N Barotech Co. | Hong D.-S.,N Barotech Co. | And 2 more authors.
Asian Journal of Chemistry | Year: 2011

Recent research has focused on enhancing the effectiveness of activated carbon by modifying their specific properties in order to enable the carbon to develop stable nanofluid. Commercial carbons were modified by wetness modification with aqueous solutions of NaHC03, followed by sonications at low temperature. The materials were characterized using XRD, SEM, EDX, size distribution, UV dispersion and thermal conductivity test. Their performance for thermal conductivity was evaluated at room temperature, the thermal conductivity of nanofluid is enhanced up to 12 % at 5 wt. % of activated carbon. The results indicate that activated carbons modified with NaHC0 3 solution and sonication treatment can be used for the nanofluid. Source


Zhu L.,Hanseo University | Meng Z.-D.,Hanseo University | Chen M.-L.,Hanseo University | Choi J.-G.,Hanseo University | And 5 more authors.
Asian Journal of Chemistry | Year: 2012

Nanofluids have been paid attention because of the intriguing heat transfer enhancement performances as one kind of promising heat transfer media. This paper reports an experimental work on the enhancement of dispersion, thermophysical and electrokinetic properties of aqueous suspensions of metal treated carbon nanoparticles (nanofluids). In this study, a simple route used to synthesize metal (Na, Al, Li) treated carbonaceous nanomaterials was studied. The dispersion effect, electrical conductivity, thermal diffusivities of the metal- carbon-nanofluids system were introduced and discussed. The results show that these properties were significantly enhanced, which could be due to not only the outstanding physical and electrical properties of the carbon nanomaterials but also to the introduction of metal ions. Source


Chen M.-L.,Hanseo University | Meng Z.-D.,Hanseo University | Zhu L.,Hanseo University | Choi J.-G.,Hanseo University | And 6 more authors.
Science of Advanced Materials | Year: 2011

Graphene was synthesized using a Hummers-Offeman method and three types of metal sources (Pd, Fe and W) were introduced to prepare metal (oxide)-graphene composites. The prepared metal (oxide)-graphene composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis and Raman spectroscopy. Nanofluids containing metal (oxide)-graphene composites with a concentration of 1 mg/L were prepared using water as the base fluid. Among these three types of nanofluids containing metal (oxide)-graphene composites, Fe-graphene showed the best and most stable dispersion, highest thermal diffusivity and electrical conductivity. © 2011 American Scientific Publishers. Source

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