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Impact of SiC colloidal suspension properties for the fabrication of highly porous ceramics
Bijay Basnet,Woo Young Jang,Jung Gyu Park,In-Sub Han,Tae Young Limc,Hyung Mi Lim,김익진 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.9
This study discusses the impact of colloidal suspension properties on the wet foam stability of porous ceramics obtained by direct foaming from a particle-stabilized colloidal suspension. The influence of binder content on the wet foam stability interms of rheology, surface tension, average bubble size and air content are reported. The partial hydrophobization of colloidal suspension was carried out by applying Octylamine as surfactant. PEG binder was added as a wet foam stabilizer. The results shows the wet foam stability of more than 90%, which corresponds to an air content of 86.5% with a colloidal suspension containing 20 wt.% of binder. The Newtonian additive, binder decreases viscosity of colloidal suspension to create a favorable condition for wet foam stability. Uniform distribution of highly open/interconnected pores was controlled with an increase in the binder content of up to 20 wt.%, leading to a higher wet foam stability for porous ceramics.
Effects of Carbon Fiber on Mechanical Behaviour of Al<sub>2</sub>O<sub>3</sub> Porous Ceramics
Basnet, Bijay,Lim, Hyung Mi,Lee, Kee Sung,Kim, Ik Jin The Korean Ceramic Society 2019 한국세라믹학회지 Vol.56 No.5
This study reports the improvement of mechanical properties of Al<sub>2</sub>O<sub>3</sub> porous ceramics from colloidal suspension with the addition of carbon fiber by direct foaming. The initial colloidal suspension of Al<sub>2</sub>O<sub>3</sub> was partially hydrophobized by surfactant to stabilize wet foam with the addition of carbon fiber from 2 to 8 wt% as stabilizer. The influence of carbon fiber on the air content, bubble size, pore size and pore distribution in terms of wet foam stability and physical properties of porous ceramics were discussed. The viscosity of the colloidal suspension was increased giving solid like properties with the increased in carbon fiber content. The mechanical properties of the sintered porous samples were investigated by Hertzian indentation test. The results show the wet foam stability of more than 90% corresponds to compressive loading of 156.48 N and elastic modulus of 57.44 MPa of sintered sample with 8 wt% of carbon fiber content.
Link Prediction in Bipartite Network Using Composite Similarities
( Bijay Gaudel ),( Deepanjal Shrestha ),( Niosh Basnet ),( Neesha Rajkarnikar ),( Seung Ryul Jeong ),( Donghai Guan ) 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.8
Analysis of a bipartite (two-mode) network is a significant research area to understand the formation of social communities, economic systems, drug side effect topology, etc. in complex information systems. Most of the previous works talk about a projection-based model or latent feature model, which predicts the link based on singular similarity. The projection-based models suffer from the loss of structural information in the projected network and the latent feature is hardly present. This work proposes a novel method for link prediction in the bipartite network based on an ensemble of composite similarities, overcoming the issues of model-based and latent feature models. The proposed method analyzes the structure, neighborhood nodes as well as latent attributes between the nodes to predict the link in the network. To illustrate the proposed method, experiments are performed with five real-world data sets and compared with various state-of-art link prediction methods and it is inferred that this method outperforms with ∼3% to ∼9% higher using area under the precision-recall curve (AUC-PR) measure. This work holds great significance in the study of biological networks, e-commerce networks, complex web-based systems, networks of drug binding, enzyme protein, and other related networks in understanding the formation of such complex networks. Further, this study helps in link prediction and its usability for different purposes ranging from building intelligent systems to providing services in big data and web-based systems.
Biomorphic carbon materials coated meso-porous crystals
박정규,Bijay Basnet,김세영,한인섭,김익진 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.4
A novel approach towards the formation of mesoporous template coated biomorphic carbon materials (BCM) was attemptedby the application of two processing technique. BCM with honeycomb structure having the pore size of 15-25 μm wasdeveloped by the carbonization method of natural wood, cypress. The three different templates were simultaneouslysynthesized and coated within BCM by an in situ hydrothermal process. All templates showed the single-phase nanocrystalwhich having the pore size of 3.45 nm for Linde type A zeolite, 11.09 nm for silicalite-1, and 10.95 nm for mesoporous silica,respectively. Their specific surface areas up to 65.97, 99.63, and 1.49 m2/g, respectively.
Effect of albumin content on the rheological properties and wet foam stability of porous ceramics
장우영,Bijay Basnet,박정규,임형미,임태영,김익진 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.4
The stabilization of wet foam was an important parameter for obtaining a large volume of dried foam in SiC porous ceramics. Octylamine was used as a foam stabilizer, which modifies the particle surface. Albumin was added as a foaming agent toachieve a higher volume of wet foam with higher stability. Viscosity of the colloidal suspension varying with albumin contentwas found to be typical, as on increasing albumin content, the slurry showed shear thickening behavior. The viscosity of theslurry was found to be increased, hindering thick strutting. This gave more stability to the wet foam on mechanical frothing,to produce porous ceramics on sintering. In terms of the rheological properties, wet foams were characterized as a functionof air content, wet foam stability, bubble size, and relative bubble size. Controlling the air content inside the foam, the wet foamstability of the wet foams was improved from 20 to 90% with the increment of albumin content. Proof of the stability is shownby the controlled increment of the relative bubble size to less than 2.5 times. With all these improved parameters uponsintering, highly interconnected pore structure was achieved for various applications.
Synthesis of Vertically Aligned Carbon Nanotubes on Silicalite-1 Monolayer-Supported Substrate
Zhao, Wei,Basnet, Bijay,Kim, Sukyoung,Kim, Ik Jin Hindawi Limited 2014 Journal of nanomaterials Vol.2014 No.-
<P>Monodisperse magneticF<SUB>e3</SUB><SUB>O4</SUB>nanoparticles (NPs) with the size of ca. 3.5 nm were prepared and used as the catalysts for the synthesis of vertically aligned carbon nanotube (VACNT) arrays. A silicalite-1 microcrystal monolayer was used as the support layer between catalyst NPs and the silicon substrate. Compared to our previous report which used radio-frequency- (rf-) sputteredF<SUB>e2</SUB><SUB>O3</SUB>film as the catalyst,F<SUB>e3</SUB><SUB>O4</SUB>NPs that were synthesized by wet chemical method showed an improved catalytic ability with less agglomeration. The silicalite-1 crystal monolayer acted as an effective “buffer” layer to prevent the catalyst NPs from agglomerating during the reaction process. It is believed that this is the first report that realizes the vertical alignment of CNTs over the zeolite monolayer, namely, silicalite-1 microcrystal monolayer, instead of using the intermediate anodic aluminum oxide (AAO) scaffold to regulate the growth direction of CNT products.</P>
Harmonized processing of biomorphic materials for the synthesis of carbon nanotubes
Jung Gyu Park,Bijay Basnet,Se Young Kim,Suk Young Kim,김익진 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.8
A three-step process was carried out to form carbon nanotubes (CNTs) on a biomorphic carbon template (BCT). First, naturalwood with 20-µm pores was transformed into a carbon template via carbonization pyrolysis. Thereafter, LTA zeolite crystalswere synthesized to have a crystal size of 0.3 µm, and an in situ hydrothermal process was used to coat the BCT with a single,homogeneous zeolite layer. Finally, CNTs were synthesized on the zeolite-coated biomorphic carbon template (ZCBCT) viacatalytic chemical vapor deposition (CCVD) with acetylene (C2H2) as a carbon source. In this study, we focused on varyingthe reaction time and temperature to improve the CNT yield and assess the morphology, crystallinity, and yield percentageof the CNTs. Multi-walled CNTs with an inner diameter of 10.7 nm were synthesized at 650 oC, and a maximum CNT yieldof 7.09% was obtained at 180 min.
Sangram Mazumder,박정규,Naboneeta Sarkar,이기성,Bijay Basnet,김익진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
This paper reports the formation of carbon nanotubes (CNTs) reinforced porous Al2O3 ceramics by a novel combination ofthree processes. Porous ceramics are developed using direct foaming. Cobalt nanoparticles as catalysis agents aresimultaneously synthesized and dispersed by colloidal process to prepare the suitable catalyst material for carbon nanotubessynthesis. The catalytic chemical vapour deposition (CCVD) technique is used to directly synthesize CNTs within the porousceramics and the effect of growth time on the morphology, crystallinity and yield of CNTs are investigated. Hertzianindentations are used to evaluate the damage behaviour under constrained loading conditions. The mechanical behaviour fromindentation load-displacement curves is compared according to CNTs contents in the samples.