Defect and Diffusion Forum最新文献

Advanced Materials and Technologies in Engineering Applications 工程应用中的先进材料和技术

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/b-m7wsba

Šárka Nenadálová, Kazuo Umemura, Ian McAndrew, S. Harikrishnan

引用次数: 0

Improving the Thermo-Physical Properties of Plam Oil with Zeolite Nanoparticles 用沸石纳米颗粒改善 Plam 油的热物理性质

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-6dmet0

P. Assawasaengrat, Thanasuta Limsakul, Penpichcha Bunprasert, Wasan Chokelarb, Pongsert Sriprom

{"title":"Improving the Thermo-Physical Properties of Plam Oil with Zeolite Nanoparticles","authors":"P. Assawasaengrat, Thanasuta Limsakul, Penpichcha Bunprasert, Wasan Chokelarb, Pongsert Sriprom","doi":"10.4028/p-6dmet0","DOIUrl":"https://doi.org/10.4028/p-6dmet0","url":null,"abstract":"This research aimed to improve the thermo-physical properties of plam oil with NaA zeolite. Palm oil was selected for heating oil due to its high flash point and environmental friendliness compared to synthetic or mineral oil. The effect of NaA zeolite concentration suspended in palm oil was investigated in terms of the specific heat capacity (Cp), viscosity (μ), viscosity index (VI), thermal analysis (TGA) and density (ρ) of palm oil. The NaA zeolite was synthesized by crystallization technique, and X-ray diffraction analysis was performed to determine NaA zeolite crystallinity. The size of NaA zeolite was measured using a particle size analyzer. The average size of the synthesized NaA zeolite was 4767 nm. After grinding process for 180 min, the average size of zeolite decreased to 632 nm. An average 632 nm NaA zeolite particle size was added to palm oil at 0.25, 0.5, 0.75 and 1 wt%. The results showed that when the NaA zeolite concentration increased, the nanofluid’s viscosity at 40 °C and 100 °C was increased. The addition of 1 wt% NaA zeolite resulted in the nanofluid having a maximum viscosity of 41.31 and 8.47 cSt at 40 °C and 100 °C, respectively. The highest viscosity index was 195 cSt when added with 0.5 wt% NaA zeolite. The density of palm oil slightly increased with increasing NaA zeolite concentrations. The specific heat capacity of palm oil increased when NaA zeolite was added. The results showed that NaA zeolite allowed palm oil to store heat energy better than palm oil, enabling it to release and absorb more heat during heat transfer. Thermogravimetric analysis, palm oil initiated to degrade at 263 °C, while the addition NaA zeolite in palm oil indicated that palm oil initiated to degrade at 350 °C. The shift in the degradation curve demonstrated that the nanofluid could withstand high temperatures. Adding NaA zeolite to palm oil showed that palm oil could endure more heat and has a long service life.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical Properties of Luffa Fiber Reinforced Recycled Polymer Composite 丝瓜纤维增强再生聚合物复合材料的力学性能

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-jrgi9s

H. Kuan, Mohd Khairul Afiq, Scollastica Jane Lumpong

{"title":"Mechanical Properties of Luffa Fiber Reinforced Recycled Polymer Composite","authors":"H. Kuan, Mohd Khairul Afiq, Scollastica Jane Lumpong","doi":"10.4028/p-jrgi9s","DOIUrl":"https://doi.org/10.4028/p-jrgi9s","url":null,"abstract":"Environmental issues over the eventual fate of post-consumer polymers can be dealt with in two separate ways which is recycling or using biodegradable polymers. However, it is evident that recycling polymers from post-consumer polymers can decrease the mechanical properties over time. Hence, to strengthen the recycled polymers, integrating fibers, such as luffa, into the High-Density Polyethylene (HDPE) matrix, was carried out to produce a fiber reinforced recycled polymer (FRrP) composite. The tensile testing of the FRrP composite shows that the 10% fiber volume fraction (FVF) composite exhibits a higher tensile strength of 3.9% than the neat recycled HDPE (RHDPE). In terms of Young’s Modulus, the 5% FVF of FRrP is shown to have a higher value than the neat RHDPE by 54%. The low density of luffa fibers also contributes to the composites lightweight character. The impact testing shows that the FRrP enhances the impact properties when compared to the neat RHDPE. The peak load, perforation energy, and the total energy absorbed by the FRrP indicate an increasing trend when luffa, of up to 15% FVF, is added as the reinforcement. Thus, the addition of luffa as reinforcement in RHDPE shows significant potential as a high-performance, sustainable, and environmentally friendly material, such as automotive parts and protective gear.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140382475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Light Extraction Efficiency Enhancement of White Organic Light-Emitting Diodes (OLEDs) by Micro/Nano-Patterning the Substrate Layer 通过微/纳米图案化基底层提高白色有机发光二极管 (OLED) 的光提取效率

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-bx2ouv

Md. Shamim Ahsan, Md. Arif Istiaq Arafat, Tasmima Akter, I. Sohn, Hun-Kook Choi

{"title":"Light Extraction Efficiency Enhancement of White Organic Light-Emitting Diodes (OLEDs) by Micro/Nano-Patterning the Substrate Layer","authors":"Md. Shamim Ahsan, Md. Arif Istiaq Arafat, Tasmima Akter, I. Sohn, Hun-Kook Choi","doi":"10.4028/p-bx2ouv","DOIUrl":"https://doi.org/10.4028/p-bx2ouv","url":null,"abstract":"We demonstrate the enhancement of light extraction efficiency of surface-emitting white Organic Light Emitting Diodes (OLEDs) by incorporating micro/nano-metric structures on the outer surface of the 3-layer substrate (SiO2-Si3N4-SiO2). To enhance light extraction efficiency of the OLEDs, various light scattering structures including plano-convex & plano-concave micro-lens array, flat-top & round-top nano-pillars array, and wavy structures were engraved on the outer surface of the substrate layer. For optimization, we varied the thickness of the internal layers of the OLEDs, and height, width, period, and radius of the micro/nano-scale structures. The performance of the micro/nano-structured OLEDs was simulated and analyzed using Lumerical FDTD and GPVDM simulators. We examined the far field light intensity, transmitted power, angular distribution of light, photon escape probability, photon density, internal & external quantum efficiency, and current-voltage curve of the designed OLEDs. We investigated the results in different locations, especially after the substrate layer: Far Field-1 (0 μm), and Far Field-2 (2.5 μm). Compared to conventional OLEDs, the micro/nano-structured OLEDs showed higher external quantum efficiency. The highest external quantum efficiency of 67.304% (Far Field-1) was detected in the round-top nano-pillars array engraved white OLED having structure period of 1.2 μm. We strongly believe that, the proposed micro/nano-structured white OLEDs are suitable for lighting applications.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140383967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Halloysite Nanotube (HNT) Dispersion Stability in 10% Ethanol-Water Mixture and Water 霍洛石纳米管（HNT）在 10% 乙醇-水混合物和水中的分散稳定性

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-vu0wmb

Aaron Zaeh F. Dilidili, Jhoneliza B. Habiling, Paul Eric C. Maglalang, J. C. Millare

引用次数: 0

Comparison of Concrete Mixtures and Alkaline Activated Material with Regard to Selected Properties for Structural Design 混凝土混合物与碱性活性材料在结构设计中的选定性能比较

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-lc2j6q

Jan Jeřábek

{"title":"Comparison of Concrete Mixtures and Alkaline Activated Material with Regard to Selected Properties for Structural Design","authors":"Jan Jeřábek","doi":"10.4028/p-lc2j6q","DOIUrl":"https://doi.org/10.4028/p-lc2j6q","url":null,"abstract":"In the field of construction, with regard to social and design requirements, it is necessary to look for innovative and advanced solutions for the materials of building and structural elements. The topic of this paper is precisely from this area, where material engineering and the field of concrete belong. The aim of the research task is to compare the properties of three different mixtures. The main goal is the analysis and comparison of samples after exposure of test samples to elevated temperatures of up to 900 °C. The mixtures are based on the same ingredients. The first mixture was a reference one, where the binder was Portland cement. In the second mix, cement was replaced, and an alkali-activated binder was used. And in the third mix, which was a modification of the first mix, part of the aggregate was replaced with light artificial aggregate. The experimental part also focused on testing and comparing the workability in the fresh state and subsequently the basic mechanical characteristics, which include strength in compression, split tension, or static modulus of elasticity. In addition, tests of resistance to frost and defrosting chemicals or determination of the tear strength of the surface layer on the test beams were also carried out.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheological Properties and Segregation of Fresh UHPC with Fibers Affected by Initial Temperature of Concrete Mix 混凝土拌合物初始温度对含纤维新拌超高性能混凝土流变性能和离析的影响

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-j1wmcb

Tomáš Bittner, Karel Hurtig, D. Jiroutová

引用次数: 0

Research on the Influence of Humidity on the Manufacture of GFRP Vessels in the Equatorial 赤道地区湿度对 GFRP 容器制造的影响研究

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-22wfse

P. Townsend, Cinthya Astudillo, Karla Larrea, Juan Carlos Suárez

引用次数: 0

Usability of the Combination of Fly Ash from Different Species 不同品种粉煤灰组合的可用性

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-0xrtoo

M. Meruňka, Petr Šperling, M. Ťažký, Rudolf Hela

引用次数: 0

Numerical Analysis of Non-Sphericity of Particles of Powder Material and their Effect on Packing Structure for Concentrated Solar Power Applications 粉末材料颗粒的非球面性及其对聚光太阳能应用中填料结构影响的数值分析

Defect and Diffusion Forum Pub Date : 2024-03-25 DOI: 10.4028/p-j8hsln

A. Boribayeva, Xeniya Gvozdeva, Boris Golman

{"title":"Numerical Analysis of Non-Sphericity of Particles of Powder Material and their Effect on Packing Structure for Concentrated Solar Power Applications","authors":"A. Boribayeva, Xeniya Gvozdeva, Boris Golman","doi":"10.4028/p-j8hsln","DOIUrl":"https://doi.org/10.4028/p-j8hsln","url":null,"abstract":"Concentrated solar power technology represents a novel approach to generating solar power, characterized by high solar radiation density and uninterrupted operation. To store thermal energy and extend system operating hours, concentrated solar power systems rely on thermal energy storage. Selecting the appropriate heat storage media is crucial for designing a cost-efficient and straightforward system capable of withstanding high processing conditions. Among many powder materials, bauxite powder stands out as alternatives to conventional molten salt for thermal storage media due to its widespread availability and suitability for operating conditions. Particle shape, particularly its sphericity, plays a vital role in efficiently packing particles which directly affects to heat transfer properties. To investigate this effect, three samples of particles with different shape were formed: spheres, ellipses, and cylinders using Discrete Element Method with equal volume and material properties, and only variation of their sphericity factors. The study focused on the analysis of the porosity of the packed bed of particles with different shapes and its influence on the packing structure properties. The analysis of local packing fraction revealed that elliptical and cylindrical particles samples exhibited reduced heap formation and a more uniform distribution along z direction during vertical packing. The coordination number and radial distribution function analyses for these non-spherical particles showed a greater number of contacts between particles and disordered distribution of particles due to mechanical interlocking of non-spherical particles. The results indicated that the deviation of sphericity has a positive impact on the denser packing of particles generated more contacts and higher local packing fraction.","PeriodicalId":11306,"journal":{"name":"Defect and Diffusion Forum","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140384233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0