Metal Nanoparticles Decorated on Carbon Nanotube Surfaces as Fillers to Improve Thermal Conductivity of Stable Phase Change Composite Materials
Xiaoyan Wang,
Huarui Dong,
Qingyi Ma,
Yanjie Chen,
Lifei Chen
Issue:
Volume 11, Issue 6, November 2022
Pages:
113-118
Received:
28 November 2022
Accepted:
21 December 2022
Published:
10 January 2023
Abstract: The composite phase change materials (CPCM) are prepared by using porous silicon carbide foam as the carrier, N-octadecane (C18) as the phase change material, and metal nanoparticles decorated on carbon nanotube surfaces (M-NPs@CNTs) as fillers. It is a new type of shape and performance stable C18/M-NPs@CNTs/SF CPCM with better performance. The thermal conductivity of the C18/M-NPs/CNT/silicon carbide foam (SF) composite is higher than that of pure C18. When the thermal filler is AgNPs@CNTs, the thermal conductivity of CPCM is improved by 666% compared with C18. The results of thermogravimetric and differential thermal analysis indicate good structural stability and chemical stability. C18/1wt%AgNPs/CNT/SF has the highest thermal conductivity and heat storage capacity, and the best overall performance in the process of thermal energy storage and release. The silver nanoparticles The well-dispersed thermal fillers (M-NPs@CNTs) form excellent heat conduction path and improve the thermal performance of the system. The SF is an excellent thermal conductive carrier materials and its porous structures are attributed to the adsorption of phase change materials and structural stability of CPCM. The application of SF both improves the thermal conductivity and electrical resistivity of CPCM and decreases its leakage during phase change. The application of solid-liquid CPCM can be enlarged in thermal management field.
Abstract: The composite phase change materials (CPCM) are prepared by using porous silicon carbide foam as the carrier, N-octadecane (C18) as the phase change material, and metal nanoparticles decorated on carbon nanotube surfaces (M-NPs@CNTs) as fillers. It is a new type of shape and performance stable C18/M-NPs@CNTs/SF CPCM with better performance. The the...
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An Investigation into the Strength Properties of Three Reclaimed Structural Timber Joist Within the University of Ibadan Community
Olusola Samuel Areo,
Ayodeji Oludare Omole,
Adewale Lukeman Adejoba,
Ifedayo Micheal Adeniyi,
Oyewumi Omolade Racheal,
Samuel Olubori Afolabi
Issue:
Volume 11, Issue 6, November 2022
Pages:
119-124
Received:
2 August 2022
Accepted:
9 November 2022
Published:
17 January 2023
Abstract: Background and Objective: The investigation presents the results of selected test assessment on physico-mechanical properties of three selected wood residues within the University of Ibadan Campus, Oyo State, Nigeria. Often, reclaimed planks were considered as useful material for heating and energy production, hence, potential re-usability of these residues for plate rack production were determined. Materials and Methods: Four planks of the selected three wood samples each were collected from the University of Ibadan community. The 12 pieces wood samples were cleaned, plained, and converted into required dimension; samples were dried to about 12%moisture content before tests. Selected physico-mechanical properties test (moisture content, volumetric shrinkage, modulus of elasticity, and modulus of rupture were carried out according to ASTM standards. The data obtained were subjected to analysis of variance (ANOVA). Results: The results of mean density show that Gliricidia sepium, Milicia excelsa and Funtumia elastica had 1032±0.97kg/m3, 548±0.57kg/m3 and 613±0.33kg/m3, respectively. The mean value for moisture content of G. sepium, M. excelsa and F. elastica ranges from 12.47±1.21, 20.84±1.21 and 18.13±1.21, respectively. While, volumetric shrinkage of G. sepium, M. excelsa and F. elastica ranged from 20.55±2.79, 7.48±2.79 and 11.43±2.79. The G. sepium, M. excelsa and F. elastica had MOE values of 8793.13±643.43 N/mm2, 8083.64±643.43 N/mm2 and 4299.54±643.43N/mm2. The mean values for MOR of G. sepium, M. excelsa and F. elastica ranges 404.69±12.362 N/mm2, 434.27±12.36N/mm2 and 388.34±12.36N/mm2. Conclusion: Gliricidia sepium wood had the highest mean density, low shrinkage value and modulus of elasticity. Therefore, it was found most suitable wood slab for plate rack production from reclaimed wood joist.
Abstract: Background and Objective: The investigation presents the results of selected test assessment on physico-mechanical properties of three selected wood residues within the University of Ibadan Campus, Oyo State, Nigeria. Often, reclaimed planks were considered as useful material for heating and energy production, hence, potential re-usability of these...
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