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Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons
Long-Yue Meng,박수진 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
Nanoporous carbons with a high specific surface area were prepared directly from thermoplastic acrylic resin as carbon precursor and MgO powder as template by carbonization over the temperature range, 500-1000 °C. The effect of the carbonization temperature on the pore structure and CO2 adsorption capacity of the obtained porous carbon was examined. The textural properties and morphology of the porous carbon materials were analyzed by N2/−196 °C and CO2/0 °C adsorption/desorption isotherms, SEM and TEM. The CO2 adsorption capacity of the prepared porous carbon was measured at 25 °C and 1 bar and 30 bar. The specific surface area increased from 237 to 1251 m2/g, and the total pore volumes increased from 0.242 to 0.763 cm3/g with increasing the carbonization temperature. The carbonization temperature acts mainly by generating large narrow micropores and mesopores with an average pore size dependent on the level of carbonization of the MgO-templated nanoporous carbons. The results showed that the MgO-templated nanoporous carbons at 900 °C exhibited the best CO2 adsorption value of 194 mg/g at 1 bar.
Improvement of Superhydrophobicity of Multi-Walled Carbon Nanotubes Produced by Fluorination
Long-Yue Meng,Soo-Jin Park 한국탄소학회 2012 Carbon Letters Vol.13 No.3
In this work, we synthesized superhydrophobic coatings by chemical surface functionalization of multi-walled carbon nanotubes (MWCNTs). This was accomplished through the radical polymerization of 3-(trimethoxysilyl) propyl methacrylate modified MWCNTs and fluoro acrylate/methyl methacrylate. The chemical compositions and microstructures of the prepared MWCNT surface were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectrometry, and scanning electron microscopy, respectively. The wettability of the MWCNTs surface was determined through contact angle assessments in different liquids. The resulting surface exhibited a water contact angle of 157.7˚, which is clear evidence of its superhydrophobicity. The 3D MWCNT networks and the low surface energy of the -C-C- and -C-F- groups play important roles in creating the superhydrophobic surface of the MWCNTs.
Enhancement of superhydrophobicity and conductivity of carbon nanofibers-coated glass fabrics
Long-Yue Meng,박수진,이경엽 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
This paper explores the role of carbon nanofibers (CNFs) on its potential to produce surperhydrophobic and conductive surfaces of glass fiber (GF) fabrics when processed by the catalytic chemical vapor deposition. Large-area helical CNFs were prepared over GF surfaces by the pyrolysis of acetylene. CNFs/GFs composites were characterized by XPS, SEM, and contact angle measurements. The results indicate the CNFs/GF fabrics surface exhibited excellent superhydrophocity and electroconductivity due to the grown CNFs The contact angle and volume resistivity of CNFs decorating the GF fabrics was equal to 1528 and 1.13 10 3 V cm, respectively.
Effect of bio-template on the properties of SiO2/Al2O3 composites for drug delivery
Long-Yue Meng,Weiqi Jiang,Wen Xiang Piao,Wan Meng 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
In this study, SiO2/Al2O3 composites (C-SLNs) were successfully synthesized using chitosan as thetemplate for drug delivery. The C-SLNs had higher specific surface areas (244–607 m2/g), total porevolumes (0.19–0.34 cm3 g 1), and narrow mesopore size distribution. The porosity of the C-SLNsprepared under high Si/Al ratio conditions was achieved mostly by the formation of wider pores thatwere distributed in the meso-/macro-pores. And, the C-SLNs were used as a levofloxacin carrier to studyits drug release behavior, which exhibited an initial fast release followed by a sustained release andantibacterial effectiveness over a long period.
Superhydrophobic carbon-based materials: a review of synthesis, structure, and applications
Meng, Long-Yue,Park, Soo-Jin 한국탄소학회 2014 Carbon Letters Vol.15 No.2
Materials with appropriate surface roughness and low surface energy can form superhy-drophobic surfaces, displaying water contact angles greater than 150º. Superhydrophobic carbon-based materials are particularly interesting due to their exceptional physicochemical properties. This review discusses the various techniques used to produce superhydrophobic carbon-based materials such as carbon fibers,carbon nanotubes, graphene, amorphous car-bons, etc. Recent advances in emerging fieldssuch as energy, environmental remediation, and thermal management in relation to these materials are also discussed.
Long-Yue Meng,박수진 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.1
In this work, the reduced graphene nanosheets were synthesized from pre-exfoliated graphite flakes. The pristine graphite flakes were firstly pre-exfoliated to graphite nanoplatelets in the presence of acetic acid. The obtained graphite nanoplatelets were treated by Hummer’s method to produce graphite oxide sheets and were finally exfoliated to graphene nanosheets by ultrasonication and reduction processes. The prepared graphene nanosheets were studied by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM), and transmission electron microscopy (TEM). From the results, it was found that the preexfoliation process showed significant influence on preparation of graphite oxide sheets and graphene nanosheets. The prepared graphene nanosheets were applied to the preparation of conductive materials, which yielded a greatly improved electrical resistance of 200 Ω/sq.
Effect of Heat Treatment on CO<SUB>2</SUB> Adsorption of Ammonized Graphite Nanofibers
Long-Yue Meng,Ki-Sook Cho,Soo-Jin Park 한국탄소학회 2010 Carbon Letters Vol.11 No.1
In this work, graphite nanofibers (GNFs) were prepared by ammonia and heat treatment at temperatures up to 1000℃ to improve its CO2 adsorption capacity. The effects of the heat treatment on the textural properties and surface chemistry of the GNFs were investigated by N2 adsorption isotherms, XRD, and elemental analysis. We found that the chemical properties of GNFs were significantly changed after the ammonia treatment. Mainly amine groups were formed on the GNF surfaces such as lactam groups, pyrrole and pyridines. The GNFs treated at 500℃ showed highest CO2 adsorption capacity of 26.9 mg/g at 273 K in this system.
Preparation and characterization of agricultural waste-based porous carbons for adsorbents
( Long-yue Meng ),( Haili Pan ),박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
In this work, a series of porous carbons were used to delineate agricultural waste the role of micro-/meso-pores in CO2 adsorption. Porous carbons were prepared from corncob by the carbonization of a mixture with magnesium acetate. And then, the prepared porous carbons were activated with CO2. The textural properties of porous carbons were investigated by N2/77 K full isotherms and SEM. This result indicated that the porosity of porous carbons attributed to the MgO template and CO2 activation. It was also found that the CO2 activation led to an increase in CO2 adsorption efficiency of porous carbons, mainly due to an increase of microporosity on porous carbon surfaces.
Meng, Long-Yue,Park, Soo-Jin Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.1
In this work, the reduced graphene nanosheets were synthesized from pre-exfoliated graphite flakes. The pristine graphite flakes were firstly pre-exfoliated to graphite nanoplatelets in the presence of acetic acid. The obtained graphite nanoplatelets were treated by Hummer's method to produce graphite oxide sheets and were finally exfoliated to graphene nanosheets by ultrasonication and reduction processes. The prepared graphene nanosheets were studied by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), atomic force microscopy (AFM), and transmission electron microscopy (TEM). From the results, it was found that the preexfoliation process showed significant influence on preparation of graphite oxide sheets and graphene nanosheets. The prepared graphene nanosheets were applied to the preparation of conductive materials, which yielded a greatly improved electrical resistance of $200{\Omega}/sq$.