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RISS 인기검색어
- 검색키워드
- 저자 : Ngo I.L. (검색결과 6 건)
- 무료
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Thermal conductivity of transparent and flexible polymers containing fillers: A literature review
Ngo, I.L.,Jeon, S.,Byon, C. Pergamon Press ; Elsevier Science Ltd 2016 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.98 No.-
Advances in micro and nanotechnology have motivated a number of recent studies on transparent and flexible polymers (TFP). In this study, a literature review on a thermal conductivity (TC) of these polymers containing fillers is first presented. Three major types of TFPs considered are poly-dimethyl siloxane (PDMS), polyethylene terephthalate (PET), and polyimides (PI). It was found from the literature review that carbon-based fillers, particularly multi-walled carbon nanotubes, and ceramic fillers have been considered as the most promising candidate for the TC enhancement of PDMS and PI, respectively. However, since very limited number of studies considered the TC of PET composites, it becomes a motivation for further investigations. This study provides better understandings in the research trends of polymer sciences, particularly the TFPs.
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Ngo, I.L.,Prabhakar Vattikuti, S.V.,Byon, C. Pergamon Press 2016 International journal of heat and mass transfer Vol. No.
This paper describes a numerical study on the thermal conductivity (TC) of core-shell nanoparticle polymer composites under the effects of thermal contact resistance (TCR), in addition to other parameters. Finite element method is used for both numerical simulation and solving the related nonlinear equations. Consequently, the effective thermal conductivity (ETC) depends significantly on the TCR, and it decreases sharply for larger volume fractions (VF) and larger TC of core-shell. The ETC from the present study matches well with that obtained by Felske model only if the TCR is negligible. Core VF of 0.516 times greater than that of shell is a necessary condition for an existence of the maximum ETC regardless of the presence of the TCR. In addition, the ETC is independent on the TCR at core-shell interface when either the TCR at shell-matrix interface is large or the TC of shell approaches a critical value. Many other good guidance are provided for enhancing the TC of core-shell nanoparticle polymer composites, and it plays an important role in producing advanced polymer composites.
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Ngo, I.L.,Byon, C. Pergamon Press 2016 International journal of heat and mass transfer Vol. No.
This paper describes an extensive study on enhancing the thermal conductivity (TC) of core-shell nanoparticle polymer composites under the effects of the TC ratios between core nanoparticles, shell layer and the matrix material, and the volume fractions (VF) of core and shell. Finite element method is used for both numerical simulation and solving the related nonlinear equations. Consequently, the effective thermal conductivity (ETC) of such a polymer composites can be enhanced by adding larger VF and higher TC of core and shell into the matrix. Shell layer plays a more important role in the TC enhancement compared to core nanoparticle. It is revealed that an abrupt increase of ETC exists even at low VF of shell layer under the appropriate conditions, high shell TC and low core one in general. The maximum ETC is due to the synergic effects of core nanoparticle and shell layer filled in the matrix, and it exists when core VF is 0.516 times greater than that of shell. Many other good guidance are provided for enhancing and achieving the maximum ETC of core-shell nanoparticle polymer composites, and they play an important role in producing the advanced polymer composites.
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Permeability of microporous wicks with geometric inverse to sintered particles
Ngo, I.L.,Byon, C. Pergamon Press ; Elsevier Science Ltd 2016 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.92 No.-
The permeability of wick microstructures plays crucial roles in the performance of heat pipes and vapor chamber since it affects the flow rate of the working fluid. In the present study the permeability of sintered particle wicks and microporous wicks with geometric inverse to sintered particles is investigated by numerical approach. Based on the numerical results, closed-form correlations are proposed for predicting the permeability of both sintered particle wicks and inverse wicks. The correlations are developed from the modified Kozeny-Carman's equation in which the Kozeny-Carman coefficient is given as an exponential function of porosity. The proposed correlations are shown to predict the previous experimental results well for an extensive parametric range. It is evident that the permeability of inverse wicks is significantly higher than that of conventional wicks due to the high porosity.
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Vattikuti, S.V.P.,Ngo, I.L.,Byon, C. ELSEVIER 2016 SOLID STATE SCIENCES Vol.61 No.-
In this work, we report the synthesis of CdS-incorporated porous WS<SUB>2</SUB> by a simple hydrothermal method. The structural, morphological, and optical properties of the samples were examined by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), high resolution X-ray photoelectron spectroscopy (XPS) and UV-visible spectrometry. The photocatalytic activities were established for degradation of crystal violet (CV) under UV and visible light irradiation. The CdS-incorporated porous WS<SUB>2</SUB> hybrid demonstrated high photocatalytic activity for degradation of CV pollutant compared to pure CdS nanoparticles and porous WS<SUB>2</SUB> sheets. This result implies that the CdS-incorporated porous WS<SUB>2</SUB> promoted more electron-hole pair transformation under UV and visible light irradiation. This significant enhancement of photocatalytic efficiency of CdS-incorporated porous WS<SUB>2</SUB> photocatalyst under visible light can be ascribed to the presence of CdS nanospheres on the meshed-like WS<SUB>2</SUB> sheets which potentially improves absorption in the visible range enabled by surface plasmon resonance effect of CdS nanospheres. The photostability and reusability of the CdS-porous WS<SUB>2</SUB> were examined through recycling experiments.
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IPCC AR6 WGI 아틀라스 주요 내용과 핵심 결과
윤진호,J. M. Gutierrez,R. G. Jones,G. T. Narisma,L. M. Alves,M. Amjad,I. V. Gorodetskaya,M. Grose,N. A. B. Klutse,S. Krakovska,J. Li,D. Martinez-Castro,L. O. Mearns,S. H. Mernild,T. Ngo-Duc,B. van den Hu 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
이번 기후변화 보고서에서는 기존의 보고서와는 달리 Interactive Atlas 라는 온라인 표출 방식을 활용하였다. 이 챕터는 5차보고서에서는 부록의 형태였으나 6차보고서에서는 완전히 독립된 챕터로 기존보고서의 지역기후변화 진단을 포함하는 내용으로 구성되었다.
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