Articles de revues : « Insulative materials »

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Karambar, Smitha, et Stefan Tenbohlen. « Compatibility Study of Silicone Rubber and Mineral Oil ». Energies 14, n^o 18 (17 septembre 2021) : 5899. http://dx.doi.org/10.3390/en14185899.

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In this study, three types of silicone rubbers, namely, insulative silicone rubber, conductive silicone rubber and silicone rubber with conductive as well as insulative layers are investigated for their compatibility with mineral oil. Mineral oil with different silicone rubber samples is thermally aged at 130 °C for 360 h, 720 h and 1080 h and at 23 °C, 98 °C and 130 °C for 360 h. At the end of each ageing interval, mineral oil and oil-impregnated silicone rubbers are investigated for their dielectric properties. Aged mineral oil samples are investigated for their moisture content, breakdown voltage, colour number, dissolved gases and total acid number, whereas solid insulation samples are investigated for their moisture content. Additionally, pressboard samples in mineral oil and mineral oil without any solid insulation materials are also aged under the same conditions and are investigated for their dielectric properties. From the obtained results, it can be assessed that the presence of carbon particles in conductive silicone rubber negatively impacts the dielectric properties of mineral oil. Among the investigated silicone rubbers, the insulative silicone rubber exhibits good compatibility with mineral oil and a strong potential for being used in mineral oil.

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Aksenov, Boris, Oleg Stepanov et ludmila Stefurak. « The temperature - insulative material that can work as the insulation and siding and decorative material ». MATEC Web of Conferences 245 (2018) : 03018. http://dx.doi.org/10.1051/matecconf/201824503018.

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The article analyzes the new temperature - insulative materials. It is motivated that the temperature - insulative material capable to work in the panel as a temperature insulative and facing-decorative material can be only composite type. The composition of the new material, the technology of its production, as well as the mathematical model of the mechanism of formation of strong crusts at its surfaces. The material that is used for the manufacture of roofing panels, panels BKU with an internal non-metallic layer. These panels allow you to break the bridges of cold in butt joints, which improves thermal performance, reliability and durability of the building as a whole. Based on the developed mathematical model, you can predict the properties of foam plastic.

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Olah, Arthur, Catalin Croitoru, Ionut Claudiu Roata et Alexandru Bogdan Andreescu. « Ignition behavior of insulative materials : a safety vision ». Materials Today : Proceedings 19 (2019) : 1003–7. http://dx.doi.org/10.1016/j.matpr.2019.08.013.

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Yamaguchi, Mina, Akihiro Ishii, Itaru Oikawa, Yusuke Yamazaki, Masaaki Imura et Hitoshi Takamura. « Antireflective black coatings comprised of Ag–Fe–O thin films with high electrical resistivity ». APL Materials 10, n^o 3 (1 mars 2022) : 031102. http://dx.doi.org/10.1063/5.0081463.

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Black antireflective (AR) coatings with electric insulative properties are required to improve the visibility of touch panel displays in the turned-on state and their appearance in the turned-off state. In this study, multilayer black AR stacks comprised of black insulative Ag–Fe–O, high- n TiO2, and low- n SiO xN y were constructed by optical simulation and prepared using RF magnetron sputtering and pulsed laser deposition. For the stacking model with five layers, the calculations show an excellent low reflectance of below 0.15% over the whole visible range with a transmittance of 0.002%. A simulation of the three-layered model indicated that the average reflectance can be reduced from over 43% for a monolayer to 3% with a reasonable average transmittance of 15% for display applications. RF magnetron sputtering, an industrial friendly method, was used to prepare the black insulative Ag–Fe–O in the AR stack for the first time. The Ag–Fe–O thin films deposited at 200–300 °C show both a large and constant absorption coefficient over the whole visible range and an acceptable high sheet resistance. The black AR stack was comprised of the black insulative Ag–Fe–O prepared at 250 °C by RF magnetron sputtering. The observed reflectance is in good agreement with the simulated model. These results indicate the high potential of the black Ag–Fe–O films for use in AR black coatings in touch panel displays for a visually attractive turn-off appearance.

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Stevens, Tyler R., Nathan B. Crane et Rydge B. Mulford. « Topology Morphing Insulation : A Review of Technologies and Energy Performance in Dynamic Building Insulation ». Energies 16, n^o 19 (7 octobre 2023) : 6978. http://dx.doi.org/10.3390/en16196978.

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Topology morphing insulation enables the on-demand switching of thermal properties between insulative and conducting states through shape change. The adaptive nature of these systems allows them to regulate heat transfer by dynamically altering insulation materials or systems in response to changing conditions, including environmental factors, electrical grid dynamics, and occupant requirements. In this article, we highlight the potential of topology morphing insulation for advancing building envelope design, improving energy efficiency, and facilitating on-demand adjustments in effective thermal conductivity. We provide a comprehensive overview of topology morphing insulation, delving into its underlying principles, mechanisms, and potential applications. This review explores cutting-edge research and the potential application of insights from non-building concepts, such as nature, textiles, and origami. Additionally, it examines crucial aspects such as actuation mechanisms, effectiveness, lifecycle considerations, sustainability implications, and manufacturing feasibility. We discuss the potential benefits and challenges associated with implementing topology morphing insulation solutions. Thanks to its transformative capabilities, topology morphing insulation holds tremendous promise for advancing building envelope design, driving energy efficiency improvements, and facilitating responsive changes in effective thermal conductivity.

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Zhao, Lirong, Yimin Cui, Junyi Li, Yuxi Xie, Wenping Li et Junying Zhang. « The 3D Controllable Fabrication of Nanomaterials with FIB-SEM Synchronization Technology ». Nanomaterials 13, n^o 12 (11 juin 2023) : 1839. http://dx.doi.org/10.3390/nano13121839.

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Nanomaterials with unique structures and functions have been widely used in the fields of microelectronics, biology, medicine, and aerospace, etc. With advantages of high resolution and multi functions (e.g., milling, deposition, and implantation), focused ion beam (FIB) technology has been widely developed due to urgent demands for the 3D fabrication of nanomaterials in recent years. In this paper, FIB technology is illustrated in detail, including ion optical systems, operating modes, and combining equipment with other systems. Together with the in situ and real-time monitoring of scanning electron microscopy (SEM) imaging, a FIB-SEM synchronization system achieved 3D controllable fabrication from conductive to semiconductive and insulative nanomaterials. The controllable FIB-SEM processing of conductive nanomaterials with a high precision is studied, especially for the FIB-induced deposition (FIBID) 3D nano-patterning and nano-origami. As for semiconductive nanomaterials, the realization of high resolution and controllability is focused on nano-origami and 3D milling with a high aspect ratio. The parameters of FIB-SEM and its working modes are analyzed and optimized to achieve the high aspect ratio fabrication and 3D reconstruction of insulative nanomaterials. Furthermore, the current challenges and future outlooks are prospected for the 3D controllable processing of flexible insulative materials with high resolution.

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Alander, Tapani M., Pekka A. Heino et Eero O. Ristolainen. « Analysis of Substrates for Single Emitter Laser Diodes ». Journal of Electronic Packaging 125, n^o 3 (1 septembre 2003) : 313–18. http://dx.doi.org/10.1115/1.1527657.

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Electrically conductive substrates (i.e., metals) are often used in the mounting of semiconductor laser diodes. While metals offer a good electrical and thermal performance, they restrict the system integration due to lack of signal routing capability. Since the implementations utilizing laser diodes have become more common, the integration level has also become an important factor in these products. Mounting of lasers on insulative substrates is the key to large-scale integration. Organic boards form the de facto standard of insulative substrates; however, their use with lasers is impossible due to low thermal conductivity. Ceramics, however, offer nearly the same thermal performance as metals but as electrically insulative materials also provide the foundation for high integration levels. In this study the effects of three different ceramic substrates on the stresses within diode lasers was evaluated. Finite element method was used to calculate the mounting induced straining and the thermal performance of the substrate. The same procedure was employed to examine the optimum metallization thickness for the ceramic substrates. The results present how greatly the substrate material can affect the very delicate laser diode. The ceramic substrates, though having nearly the same properties, exhibited clearly distinctive behavior and a great difference in thermal and mechanical performance.

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Biswas, Ratul Kumar, Nazar Farid, Gerard O’Connor et Patricia Scully. « Improved conductivity of carbonized polyimide by CO2 laser graphitization ». Journal of Materials Chemistry C 8, n^o 13 (2020) : 4493–501. http://dx.doi.org/10.1039/c9tc05737d.

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Direct laser writing (DLW) is a fast and cost-effective technique for printing conductive structures on flexible substrates such as polyimide (PI) by the conversion of insulative PI to conductive carbon.

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Yang, Lixia, Yang Ding, Mengmeng Yang, Yapeng Wang, Deniz Eren Erişen, Zhaofeng Chen, Qiong Wu et Guiyuan Zheng. « Ultra-Light and Ultra-Low Thermal Conductivity of Elastic Silica Nanofibrous Aerogel with TiO2 Opacifier Particles as Filler ». Nanomaterials 12, n^o 22 (8 novembre 2022) : 3928. http://dx.doi.org/10.3390/nano12223928.

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The thermal radiation phenomenon is more crucial than other thermal transportation phenomena at elevated temperatures (>300 °C). Therefore, infrared radiation resistance and its performance on thermal conduction of nanofibrous aerogel with Titanium oxide (TiO2) filler have been investigated compared to control groups (silica nanofibrous aerogels with and without filler). Nanofibrous aerogel has been produced by electrospun silica nanofibers. Later, TiO2 opacifier and a non-opacifier filled materials were prepared by a solution homogenization method and then freeze-dried to obtain particle-filled nanofibrous aerogel. Moreover, the thermal radiation conductivity of the composite was calculated by numerical simulation, and the effect of the anti-infrared radiation of the TiO2 opacifier was obtained. The fascinating inhibited infrared radiation transmission performance (infrared transmittance ~67% at 3 μm) and excellent thermal insulation effect (thermal conductivity of 0.019 Wm−1K−1 at room temperature) and maximum compressive strengths (3.22 kPa) of silica nanofibrous aerogel with TiO2 opacifier were verified. Excellent thermal insulation, compression and thermal stability properties show its potential for practical application in industrial production. The successful synthesis of this material may shed light on the development of other insulative ceramic aerogels.

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Koyama, A., K. Fukami, T. Yamauchi, N. Nishi, T. Sakka, A. Kitada et K. Murase. « Lateral Growth of Polypyrrole Electropolymerized along Hydrophobic Insulative Substrates ». ECS Electrochemistry Letters 3, n^o 7 (30 avril 2014) : G5—G7. http://dx.doi.org/10.1149/2.0021407eel.

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Lertwattanaruk, Pusit, Natt Makul et Kanokwan Masuwan. « EXPERIMENTAL STUDY OF ACOUSTICAL INSULATION OF CEMENT-BASED BOARD PREPARED WITH WASTE COCONUT COIR AND OIL PALM FIBERS ». Journal of Green Building 16, n^o 4 (1 septembre 2021) : 63–80. http://dx.doi.org/10.3992/jgb.16.4.63.

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ABSTRACT Among the major challenges facing the modern era of technological and industrial advancements are pollution and exponentially growing energy consumption. Pollution continues to be a menace affecting different aspects of life such as health, productivity, and comfort. This paper focuses on the elimination or reduction of sound pollution in buildings using cement-based boards made from pretreated coconut coir and oil palm fibers obtained from agricultural residues. The study includes an account of the preparation of fiber cement boards made from Portland cement Type 1, limestone powder, water, sand, and pretreated coconut coir and oil palm fibers at 5, 10, 15, and 20% by weight of powder materials, respectively, and a high-range water reducer in order to make sure that the natural materials would be spread in an even way throughout the specimens. Sound insulation tests were performed as key indicators of the performance of the fiber cement boards. It was found that an increase in the proportion of natural materials resulted in fiber cement boards with decreased density, compressive strength, and flexural strength. Furthermore, in relation to both physical and mechanical performance, the boards incorporating coconut fibers were superior to those incorporating oil palm fibers. With an increased proportion of natural fibers, sound insulation performance tended to improve. The boards prepared with coconut coir and oil palm fibers in this study yielded acceptable physical and mechanical properties and showed promise in relation to providing insulative protection against sound.

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Eze, A. H., et Á. Lakatos. « Applications of thermal insulation materials by aircraft ». Journal of Physics : Conference Series 2628, n^o 1 (1 octobre 2023) : 012018. http://dx.doi.org/10.1088/1742-6596/2628/1/012018.

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Abstract Lightweight materials such as microfiber insulation or polymer foam are typically used to insulate cars and aircraft. But here, too, the use of state-of-the-art “super-insulating” materials is a valid answer. Vacuum insulation panels also serve as reliable insulators for electric vehicles. In this study, we will analyze in depth the potential uses for aerogels, polymer foams, and microfiber insulation. In addition, their thermal properties are briefly outlined, with a special focus on thermal conductivity and compressibility. Finding the right solution for the aircraft industry is critical. To meet increasingly stringent requirements, aircraft materials must meet several criteria, including lightweight, minimal noise, and insulation from the heat.

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Shah, Sagarkumar, Vinay Bhatt, Jinesh Shah, Manojkumar Sheladiya et Pratik Kikani. « Study of Thermal Insulating Materials And Costing of Economic Thickness of Insulation ». Indian Journal of Applied Research 3, n^o 8 (1 octobre 2011) : 77–80. http://dx.doi.org/10.15373/2249555x/aug2013/79.

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Grząbka-Zasadzińska, Aleksandra, Przemysław Bartczak et Sławomir Borysiak. « Highly Insulative PEG-Grafted Cellulose Polyurethane Foams—From Synthesis to Application Properties ». Materials 14, n^o 21 (24 octobre 2021) : 6363. http://dx.doi.org/10.3390/ma14216363.

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In this paper, native cellulose I was subjected to alkaline treatment. As a result, cellulose I was transformed to cellulose II and some nanometric particles were formed. Both polymorphic forms of cellulose were modified with poly(ethylene glycol) (PEG) and then used as fillers for polyurethane. Composites were prepared in a one-step process. Cellulosic fillers were characterized in terms of their chemical (Fourier transformation infrared spectroscopy) and supermolecular structure (X-ray diffraction), as well as their particle size. Investigation of composite polyurethane included measurements of density, characteristic processing times of foam formation, compression strength, dimensional stability, water absorption, and thermal conductivity. Much focus was put on the application aspect of the produced insulation polyurethane foams. It was shown that modification of cellulosic filler with poly(ethylene glycol) has a positive influence on formation of polyurethane composites—if modified filler was used, the values of compression strength and density increased, while water sorption and thermal conductivity decreased. Moreover, it was proven that the introduction of cellulosic fillers into the polyurethane matrix does not deteriorate the strength or thermal properties of the foams, and that composites with such fillers have good application potential.

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Wu, Zhaoyang, Chen Xian, Jixiang Jia, Xiangwei Liao, Hui Kong et Kun Xu. « Formation Process of the Integrated Core(Fe-6.5wt.%Si)@Shell(SiO2) Structure Obtained via Fluidized Bed Chemical Vapor Deposition ». Metals 10, n^o 4 (17 avril 2020) : 520. http://dx.doi.org/10.3390/met10040520.

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As electromagnetic functional materials, soft magnetic composites (SMCs) have great potential for applications in high-energy electromagnetic conversion devices. The most effective way to optimize the performance of an SMC is to incorporate it into insulated ferromagnetic core-shell particles with high structural uniformity and integrity. Fluidized bed chemical vapor deposition (FBCVD) is a facile and efficient technique for the synthesis of ferromagnetic/SiO2 core-shell particles. However, the formation mechanism and conditions of integrated ferromagnetic/SiO2 core-shell structures during the FBCVD process are not fully understood. On this basis, the formation process and the deposition time required for transformation of the Fe-6.5wt.%Si substrate into the Fe-6.5wt.%Si/SiO2 composite, and finally into the Fe-6.5wt.%Si/SiO2 core-shell structure, were investigated. Deposition of the insulative SiO2 coating onto the Fe-6.5wt.%Si particles was described by the three-dimensional island nucleation theory. The SiO2 islands were initially concentrated in rough areas on the Fe-6.5wt.%Si particle substrates owing to the lower heterogeneous nucleation energy. Deposition for at least 960 s was necessary to obtain the integrated ferromagnetic/SiO2 core-shell structure. The uniformity, integrity, and thickness of the insulative SiO2 coating increased with the increasing deposition time. The results in this study may provide a foundation for future kinetics investigations and the application of FBCVD technology.

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Divigalpitiya, Ranjith. « Effect of Insulative Debris on the Contact Resistance of Anisotropic Conductive Film (ACF) Adhesives : A Comparison Between a Solid Conducting Particle and a Coated Insulative Particle ». IEEE Transactions on Components and Packaging Technologies 31, n^o 1 (mars 2008) : 222–28. http://dx.doi.org/10.1109/tcapt.2008.916789.

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Ikeda, Shuji, Kouich Nagasawa, Satoshi Meguro et Sho Yamamoto. « 4890148 Semiconductor memory cell device with thick insulative layer ». Microelectronics Reliability 31, n^o 1 (janvier 1991) : ii. http://dx.doi.org/10.1016/0026-2714(91)90471-i.

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Kaiser, M. J., K. L. Kaiser et W. L. Weeks. « Critical charge relationship for spherical droplets of perfect and imperfect insulative liquids ». Mechanics Research Communications 21, n^o 1 (janvier 1994) : 1–9. http://dx.doi.org/10.1016/0093-6413(94)90002-7.

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Dionne, J., M. Laganière et Y. Desjardins. « Evaluation of the Efficiency of Winter Protections against Winter Damage on Poa annua Golf Greens ». HortScience 30, n^o 4 (juillet 1995) : 897A—897. http://dx.doi.org/10.21273/hortsci.30.4.897a.

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Extensive winterkill of golf greens is a major problem in northern climates. In this study, the efficiency of several protective covering materials used to shelter Poa annua golf greens from winter damages was evaluated over 2 years. The bioclimatological environment under these protective covers was studied at crown level and at 5, 10, and 20 cm under the ground Treatments (permeable and impermeable covers, curled wood Excelsior mat, straw mulch protected by an impermeable cover, geotextile material with an impermeable cover, and air space under an impermeable cover) were compared to a control treatment without protection. Results indicate that temperature profile was strongly influenced by both winter protection covers and snow depth Temperatures at crown level were stable and just below 0C under plots covered with a significant amount of snow. However, temperatures varied considerably, when snow cover was <15 cm. Snow thermal conductivity was increased by periods of rain during the winter. Impermeable covers minimized the negative effect of this change in the insulation properties of the snow cover by limiting temperature fluctuations at the crown level. Temperature profiles under permeable covers were similar to profiles observed on control plots. Temperature profiles were comparable for 5 and 10 cm air space treatments and were not significantly different when compared to impermeable covers spread directly on the turf. Straw with an impermeable cover and Excelsior mats maintained crown level temperatures at >0C and the incidence of disease was higher under these highly insulative materials.

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Noda, Suguru. « (Invited) Production and Functionalization of Carbon Nanotubes for Electrochemical Energy Storage Devices ». ECS Meeting Abstracts MA2022-01, n^o 10 (7 juillet 2022) : 768. http://dx.doi.org/10.1149/ma2022-0110768mtgabs.

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Self-supporting, sponge-like paper of carbon nanotubes (CNTs) can be a new platform for high energy/power density batteries. Presently, battery electrodes are built on metallic foils having only two faces and large mass with the aid of polymeric binders and conductive fillers. CNT paper can replace all these components. Furthermore, it captures nanomaterials at high loading, activates insulative materials, and moderates volumetric change of active materials. We have developed semi-continuous fluidized bed chemical vapor deposition method [1], which yields submillimeter-long few-wall CNTs with carbon purity >99 wt% and metal impurity <0.1 wt% [2]. By capturing capacitive particles (99 wt%) with CNTs (1 wt%), a lithium ion full cell with graphite-CNT anode and LiCoO2-CNT cathode is demonstrated (Figure 1b) [3]. This platform is also effective to create electrodes of the emerging active materials such as Si anode [4] and S cathode [5] with practically high gravimetric, areal, and volumetric loadings, and realized Li x Si-S and Li-Li2S x full cells [6,7]. In addition, by combining with the insulative sponge of boron nitride nanotubes (BNNTs), the graphite-CNT|BNNT| LiCoO2-CNT full cell with high thermal stability was developed [8]. [1] D.Y. Kim, et al., Carbon 49, 1972 (2011). [2] Z. Chen, et al., Carbon 80, 339 (2014). [3] K. Hasegawa and S. Noda, J. Power Sources 321, 155 (2016). [4] T. Kowase, et al., J. Power Sources 363, 450 (2017). [5] K. Hori, et al., J. Phys. Chem. C 123, 3951 (2019). [6] K. Hori, et al., Carbon 161, 612-621 (2020). [7] Y. Yoshie, et al., Carbon 182, 32-41 (2021). [8] K. Kaneko, et al., Carbon 167, 596-600 (2020). Figure 1. (a) Semi-continuous production of submillimeter-long few-wall CNTs by fluidized bed [1]. (b) Lithium ion full cell made of graphite-CNT anode and LiCoO2-CNT cathode [3]. Figure 1

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Lee, Jong-Gun, Do-Yeon Kim, Bhavana N. Joshi, Jong-Hyuk Lee, Tae-Kyu Lee, Jang-soo Kim, Dae-ho Yang, Woo-Young Kim, Salem S. Al-Deyab et Sam S. Yoon. « Electrically Insulative Performances of Ceramic and Clay Films Deposited via Supersonic Spraying ». Journal of Thermal Spray Technology 25, n^o 4 (2 février 2016) : 763–69. http://dx.doi.org/10.1007/s11666-016-0384-x.

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Li, Pengwei, Huijun Wu, Yanchen Liu, Jianming Yang, Zhaosong Fang et Borong Lin. « Preparation and optimization of ultra-light and thermal insulative aerogel foam concrete ». Construction and Building Materials 205 (avril 2019) : 529–42. http://dx.doi.org/10.1016/j.conbuildmat.2019.01.212.

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Fleury, Blaise, Eldho Abraham, Joshua A. De La Cruz, Varun S. Chandrasekar, Bohdan Senyuk, Qingkun Liu, Vladyslav Cherpak, Sungoh Park, Jan Bart ten Hove et Ivan I. Smalyukh. « Aerogel from Sustainably Grown Bacterial Cellulose Pellicles as a Thermally Insulative Film for Building Envelopes ». ACS Applied Materials & ; Interfaces 12, n^o 30 (2 juillet 2020) : 34115–21. http://dx.doi.org/10.1021/acsami.0c08879.

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Sontag, M. Suzanne. « Comfort Dimensions of Actual and Ideal Insulative Clothing for Older Women ». Clothing and Textiles Research Journal 4, n^o 1 (septembre 1985) : 9–17. http://dx.doi.org/10.1177/0887302x8500400102.

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Li, Yingxin, Jiaheng Wang, Haojie Li, Bingsen Zhang, Ying Cui, Jing Cai, Yaping Wang et al. « Effect of conductive PANI vs. insulative PS shell coated Ni nanochains on electromagnetic wave absorption ». Journal of Alloys and Compounds 821 (avril 2020) : 153531. http://dx.doi.org/10.1016/j.jallcom.2019.153531.

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Sudakov, Andrii, Ihor Chudyk, Diana Sudakova et Liudmyla Dziubyk. « Innovative technology for insulating the borehole absorbing horizons with thermoplastic materials ». E3S Web of Conferences 123 (2019) : 01033. http://dx.doi.org/10.1051/e3sconf/201912301033.

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The purpose of the work is to increase the insulation work efficiency by using thermoplastic mixes based on polyethylene terephthalate. The tasks set were solved by a complex method of research, including the analysis and synthesis of the literary and patent sources, as well as conducting the analytical and experimental studies. The experimental data were processed on a PC using the methods of mathematical statistics. A method for insulating the absorbing horizons with thermoplastic materials has been developed and substantiated. To implement it, the following technological operations should be performed: supply of the thermoplastic materials to the borehole bottom, melting and squeezing of thermoplastic materials into absorption channels. For various geological and technical conditions of drilling, technological schemes of insulating the absorbing horizons with thermoplastic materials are proposed. The use of the household waste based on polyethylene terephthalate has been proposed as the plugging material to insulate the absorbing horizons of boreholes. For the first time, the possibility of using the household waste based on polyethylene terephthalate as the plugging thermoplastic material has been substantiated and proved. For the first time, a method for determining the efficient range of technology application for absorbing and unstable horizons insulation with thermoplastic materials through the use of bottom hole thermal sources has been substantiated analytically.

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Zach, Jiri, Jitka Peterková, Vít Petranek, Jana Kosíková et Azra Korjenic. « Investigation of Thermal Insulation Materials Based on Easy Renewable Row Materials from Agriculture ». Advanced Materials Research 335-336 (septembre 2011) : 1412–17. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.1412.

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Production of building materials is mostly energy consuming. In the sphere of insulation materials we mostly see rock wool based materials or foam-plastic materials whose production process is demanding from material aspect and raw materials aspect as well. At present the demand for thermal insulation materials has been growing globally. The thermal insulation materials form integral part of all constructions in civil engineering. The materials mainly fulfill the thermal insulating functions and also the sound-insulating one. The majority of thermal insulation materials are able to fulfill both of the functions simultaneously. The paper describes questions of thermal insulation materials development with good sound properties based on natural fibres that represent a quickly renewable source of raw materials coming from agriculture. The main advantage of the materials are mainly the local availability and simple renewability of the raw materials. In addition an easy recycling of the materials after their service life end in the building construction and last but not least also the connection of human friendly properties of organic materials with advanced product manufacture qualities of modern insulation materials.

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Yamaguchi, Mina, Akihiro Ishii, Itaru Oikawa, Yusuke Yamazaki, Masaaki Imura et Hitoshi Takamura. « Heat-Resistant Black Insulative Thin Films for Flat-Panel Displays in Al-Doped Ag–Fe–O Systems ». ACS Applied Materials & ; Interfaces 13, n^o 48 (29 novembre 2021) : 57971–80. http://dx.doi.org/10.1021/acsami.1c17599.

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Lin, Genlian, Bin-Huan Xie, Juan Hu, Xiao Huang et Guo-Jun Zhang. « Aligned Graphene Oxide Nanofillers : An Approach to Prepare Highly Thermally Conductive and Electrically Insulative Transparent Polymer Composites ». Journal of Nanomaterials 2015 (2015) : 1–6. http://dx.doi.org/10.1155/2015/957068.

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Graphene oxide (GO)/polyvinyl alcohol composites with extremely high in-plane thermal conductivities are prepared by a simple tape casting process using water as process solvent. The in-plane thermal conductivity of the composite can reach 17.61 W/mK at only 0.1 wt% GO loading, which is close to that of fully dense alumina. The excellent thermal conducting ability, the unique two-dimensional morphology, and the all-wet handling of the GO fillers as well as the high orientation of the fillers in the polymer matrix all contribute to the high thermal conductivities achieved. Meanwhile, the composites show good electrical insulation property and decent transparency.

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Jo, Kanghee, Jooyeon Ha, Taeheun Lim et Heesoo Lee. « Insulative Phase Formation and Polarization Resistance of PrBaCo2−xCuxO5+δ under Thermal Stress ». Applied Sciences 12, n^o 1 (24 décembre 2021) : 151. http://dx.doi.org/10.3390/app12010151.

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The degradation behavior of PrBaCo2−xCuxO5+δ (x = 0, 0.2, 0.5) under thermal stress was investigated in terms of phase formation and polarization resistance. The tetragonal phase was indexed in all compositions of PBCCux, and the secondary phase, BaO, was identified after thermal degradation in the crystal structure analysis. BaO formation is induced by the nature of perovskite to terminate the surface with AO layer. For pristine specimens, the oxygen vacancy peak ratio was increased from 57% to 60% according to the decrease in the average oxidation number of the B-site ion with Cu doping. After thermal deterioration, the oxidation number of B-site ions was increased, and the M = O bonding peak increased due to the decrease in oxygen vacancies and BaO formation according to the thermal stress. In all compositions, the electrical conductivity decreased from 1000 S/cm to 17 S/cm, and the polarization resistance increased approximately 200 times. These results are considered to be related to the increase in the oxidation number of B-site ions along with the formation of secondary phases.

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Gattu, Sai Dutta, et Jiwang Yan. « Micro Electrical Discharge Machining of Ultrafine Particle Type Tungsten Carbide Using Dielectrics Mixed with Various Powders ». Micromachines 13, n^o 7 (25 juin 2022) : 998. http://dx.doi.org/10.3390/mi13070998.

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Electrical discharge machining (EDM) is widely used to machine hard materials, such as tungsten carbide; however, the machining rate and surface quality are low. In this research, the effects of mixing electrically conductive carbon nanofiber (CnF), semiconductive silicon (Si) powder, and insulative alumina powder (Al2O3) at different concentrations in a dielectric fluid were studied by observing single discharge craters and hole machining performance in the EDM of ultrafine particle type tungsten carbide. Craters obtained using carbon nanofiber and alumina were much smaller than in oil-only conditions. In contrast, The results show that adding CnF significantly improved the material removal rate under all conditions. Si and Al2O3 powders only improved the machining performance at a high discharge energy of 110 V. Furthermore, improvement in surface roughness was observed prominently at high voltages for all the powders. Among the three powders, alumina was found to improve the surface roughness the most.

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Hassani, A. V., et E. Brundrett. « An experimental and analytical evaluation of the insulative properties of double glazing and thick curtains ». Solar Energy 37, n^o 6 (1986) : 437–44. http://dx.doi.org/10.1016/0038-092x(86)90036-8.

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Li, Yusheng, Dandan Wang, Shuzi Hayase, Yongge Yang, Chao Ding et Qing Shen. « Efficient Exciton Dislocation and Ultrafast Charge Extraction in CsPbI3 Perovskite Quantum Dots by Using Fullerene Derivative as Semiconductor Ligand ». Nanomaterials 12, n^o 18 (7 septembre 2022) : 3101. http://dx.doi.org/10.3390/nano12183101.

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CsPbI3 quantum dots (QDs) are of great interest in new-generation photovoltaics (PVs) due to their excellent optoelectronic properties. The long and insulative ligands protect their phase stability and enable superior photoluminescence quantum yield, however, limiting charge transportation and extraction in PV devices. In this work, we use a fullerene derivative with the carboxylic anchor group ([SAM]C60) as the semiconductor ligand and build the type II heterojunction system of CsPbI3 QDs and [SAM]C60 molecules. We find their combination enables obvious exciton dislocation and highly efficient photogenerated charge extraction. After the introduction of [SAM]C60, the exciton-binding energy of CsPbI3 decreases from 30 meV to 7 meV and the fluorescence emission mechanism also exhibits obvious changes. Transient absorption spectroscopy visualizes a ~5 ps electron extraction rate in this system. The findings gained here may guide the development of perovskite QD devices.

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Yang, Dehong, Peng Xu, Chaofan Tian, Sen Li, Tao Xing, Zhi Li, Xuebin Wang et Pengcheng Dai. « Biomass-Derived Flexible Carbon Architectures as Self-Supporting Electrodes for Energy Storage ». Molecules 28, n^o 17 (31 août 2023) : 6377. http://dx.doi.org/10.3390/molecules28176377.

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With the swift advancement of the wearable electronic devices industry, the energy storage components of these devices must possess the capability to maintain stable mechanical and chemical properties after undergoing multiple bending or tensile deformations. This circumstance has expedited research efforts toward novel electrode materials for flexible energy storage devices. Nonetheless, among the numerous materials investigated to date, the incorporation of metal current collectors or insulative adhesives remains requisite, which entails additional costs, unnecessary weight, and high contact resistance. At present, biomass-derived flexible architectures stand out as a promising choice in electrochemical energy device applications. Flexible self-supporting properties impart a heightened mechanical performance, obviating the need for additional binders and lowering the contact resistance. Renewable, earth-abundant biomass endows these materials with cost-effectiveness, diversity, and modulable chemical properties. To fully exploit the application potential in biomass-derived flexible carbon architectures, understanding the latest advancements and the comprehensive foundation behind their synthesis assumes significance. This review delves into the comprehensive analysis of biomass feedstocks and methods employed in the synthesis of flexible self-supporting carbon electrodes. Subsequently, the advancements in their application in energy storage devices are elucidated. Finally, an outlook on the potential of flexible carbon architectures and the challenges they face is provided.

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Rafiq, Muhammad, Muhammad Shafique, Anam Azam, Muhammad Ateeq, Israr Ahmad Khan et Abid Hussain. « Sustainable, Renewable and Environmental-Friendly Insulation Systems for High Voltages Applications ». Molecules 25, n^o 17 (27 août 2020) : 3901. http://dx.doi.org/10.3390/molecules25173901.

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With the inception of high voltage (HV), requisites on the insulating permanence of HV equipment is becoming increasingly crucial. Mineral/synthetic oil liquid insulation—together with solid insulation materials (paper, pressboard)—is the fundamental insulation constituent in HV apparatuses; their insulation attributes perform a substantial part in a reliable and steady performance. Meanwhile, implications on the environment, scarcity of petroleum oil supplies and discarding complications with waste oil have stimulated investigators to steer their attention towards sustainable, renewable, biodegradable and environmentally friendly insulating substances. The contemporary insulating constituent’s evolution is driven by numerous dynamics—in particular, environmental obligations and other security and economic issues. Consequently, HV equipment manufacturers must address novel specifications concerning to these new standards. Renewable, sustainable and environmentally friendly insulating materials are continuously substituting conventional insulating items in the market place. These are favorable to traditional insulating materials, due to their superior functionality. The also offer explicit security and eco-friendly advantages. This article discusses cutting-edge technology of environmentally friendly insulating materials, including their fabrication, processing and characterization. The new renewable, insulating systems used in HV equipment are submitted and their fundamental gains stated in comparison with conventional insulating materials. Several experimental efforts carried out in various parts of the world are presented, offering an outline of the existing research conducted on renewable insulating systems. The significance of this article lies in summarizing prior investigations, classifying research essence, inducements and predicting forthcoming research trends. Furthermore, opportunities and constraints being experienced in the field of exploration are evidently reported. Last but not least, imminent research proposals and applications are recommended.

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Yu, Xing, Liu Lei, Cao Chang, Fan Weidong, Yan Keju et Cheng Zhongfu. « A Review of Research Status and Prospect of Vacuum Insulated Tubing Insulation System ». E3S Web of Conferences 155 (2020) : 01007. http://dx.doi.org/10.1051/e3sconf/202015501007.

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Vacuum heat insulating tubing is an important wellbore heat insulating facility for heavy oil thermal recovery at present. Its heat insulating performance directly affects the thermal recovery efficiency. The research on the heat insulating system of vacuum heat insulating tubing is of great significance to improve and improve the heat insulating performance and enhance the thermal recovery of heavy oil. This paper summarizes and analyses the current research status of vacuum insulated tubing insulation system. It elaborates the insulation structure, insulation materials, annular air charging and vacuum pumping, insulation coating and so on. It provides reference and reference for the future research of vacuum insulated tubing.

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Krashchenko, Vladislav, Nikita Tretyakov, Alexander Chernov, Ilmir Shaykhalov et Alexey Zhukov. « Modeling and thermal calculation of a pipeline insulation system ». E3S Web of Conferences 164 (2020) : 14021. http://dx.doi.org/10.1051/e3sconf/202016414021.

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Energy efficiency of heating networks depends on the costs of the manufacture of insulation materials and components, its installation and exploitation of insulating jacket. As insulation materials for insulation of heating networks, products based on rock wool, polyurethane foam extruded polystyrene foam, foam rubber and polyethylene foam. In this contribution introduced basic principles of calculating the thickness of the thermal insulation of a pipeline by the value of the standard density of the heat flow are given using an example of the use of products based on polyethylene foam. Calculation of the heat flux from the surface of the heat-insulating structure is carried out at a given thickness of the heat-insulating layer if there is a need to determine heat loss (or cold loss). The basis for the calculation is a mathematical model of heat transfer, a developed calculation algorithm and a computer program. The method of installation of thermal insulation depends on the diameter of the pipeline and the selected type of product. Insulating cylinders or cylinders in combination with heat-insulating mats are used for pipelines of small diameters. Roll materials are used to isolate large diameters. Products are fixed on pipelines using mechanical fasteners.

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Bruyako, Mihail Gerasimovich, Larisa Grigorieva et Evgeniya Viktorovna Sokoreva. « Influence of Reactive Organic Flame Retardants on Properties of Resol Phenoplast Foams ». Advanced Materials Research 1025-1026 (septembre 2014) : 451–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.451.

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Found that Organophosphorus Compounds Reduce the Flammability of Resol Phenoplast Foams. Quality Improves Thermal Insulation Materials, the Use of such Phenolicfoam. Analysis of Using the Heat-Insulating Materialsindicates that Heat Insulation Made with Filling Phenol Foam Plastics Havinglow Heat-Conductivity and Relatively Low Cost of Raw Materials is Superior Bytheir Technical and Economic Performance to Mineral and other Polymericheat-Insulating Materials. Meanwhile, Relatively Low Strength and Smolderingpropensity of Resole Foam Phenol Plastics, as well as Excessive Fumes Duringthe Production Process of Heat-Insulating Materials on their Base, Containwider Usage of Phenol Foam Plastics in Building.

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Zhang, Haiying, Jianming Yang, Huijun Wu, Ping Fu, Yanchen Liu et Wenbing Yang. « Dynamic thermal performance of ultra-light and thermal-insulative aerogel foamed concrete for building energy efficiency ». Solar Energy 204 (juillet 2020) : 569–76. http://dx.doi.org/10.1016/j.solener.2020.04.092.

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Huang, Hanxiao, Yunshui Yu, Yan Qing, Xiaofeng Zhang, Jia Cui et Hankun Wang. « Ultralight Industrial Bamboo Residue-Derived Holocellulose Thermal Insulation Aerogels with Hydrophobic and Fire Resistant Properties ». Materials 13, n^o 2 (19 janvier 2020) : 477. http://dx.doi.org/10.3390/ma13020477.

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In this study, water-soluble ammonium polyphosphate- (APP) and methyl trimethoxysilane (MTMS)-modified industrial bamboo residue (IBR)-derived holocellulose nanofibrils (HCNF/APP/MTMS) were used as the raw materials to prepare aerogels in a freeze-drying process. Synthetically modified aerogels were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, and thermal stability measurements. As-prepared HCNF/APP/MTMS aerogels showed themselves to be soft and flexible. The scanning electron microscopy (SEM) analysis showed that the foam-like structure translates into a 3D network structure from HCNF aerogels to HCNF/APP/MTMS aerogels. The compressive modules of the HCNF/APP/MTMS aerogels were decreased from 38 kPa to 8.9 kPa with a density in the range of 12.04–28.54 kg/m3, which was due to the structural change caused by the addition of APP and MTMS. Compared with HCNF aerogels, HCNF/APP/MTMS aerogels showed a high hydrophobicity, in which the water contact angle was 130°, and great flame retardant properties. The peak of heat release rate (pHRR) and total smoke production (TSP) decreased from 466.6 to 219.1 kW/m2 and 0.18 to 0.04 m2, respectively, meanwhile, the fire growth rate (FIGRA) decreased to 8.76 kW/s·m2. The thermal conductivity of the HCNF/APP/MTMS aerogels was 0.039 W/m·K. All results indicated the prepared aerogels should be expected to show great potential for thermally insulative materials.

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Parikesit, Gea O. F., Anton P. Markesteijn, Oana M. Piciu, Andre Bossche, Jerry Westerweel, Ian T. Young et Yuval Garini. « Size-dependent trajectories of DNA macromolecules due to insulative dielectrophoresis in submicrometer-deep fluidic channels ». Biomicrofluidics 2, n^o 2 (juin 2008) : 024103. http://dx.doi.org/10.1063/1.2930817.

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Voznyak, Orest, Yuriy Yurkevych, Iryna Sukholova, Oleksandr Dovbush et Mariana Kasynets. « Thermally conductive cost of the heat-insulating materials ». Theory and Building Practice 2020, n^o 2 (20 novembre 2020) : 92–98. http://dx.doi.org/10.23939/jtbp2020.02.092.

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The article presents the results of theoretical research to achieve the maximum effect in determination of the economically feasible level of buildings thermal protection. It must be optimal both thermally and economically, an indicator of which there are the costs. Graphical and analytical dependences are given. The research results substantiate the maximum effect when different thermal insulating materials are used. The aim is to increase the efficiency of energy saving measures, reduce their cost by optimizing the cost of thermal energy and insulating materials, determining the optimization criteria and justification for choice the optimal insulating material and its thickness, and determining the optimal thermal resistance, identifying ways to improve energy efficiency and substantiation of the calculation method. One of the most common thermal renovation measures, namely insulation of external walls, is considered. An economic assessment has been conducted, which is an important factor in a certain energy-saving proposition. The solution of the problem is presented, which includes two stages. The result of the first stage is the selection of the optimal heat-insulating material. The second stage is a substantiation of economically expedient thickness of the heatinsulating material. The obtained results make it possible to increase the efficiency of energy saving in thermal renovation of buildings taking into account both energy and economic aspects. In this paper the results of mathematical provement of such factor importance as the thermally conductive cost of the heat-insulating material at their thickness optimization are presented. Determining for the establishment of the normative thermal resistance in the future is the ratio of the cost of thermal energy to the thermal conductivity of the insulating material.

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HARANINA, Olha, Yana REDвЂ™KO, Serhiy KAMENETS et Raisa VATAN. « DETERMINATION OF THE EFFICIENCY OF APPLICATION OF PACKAGES OF TEXTILE MATERIALS FOR THE PRODUCTION OF A SPECIAL PURPOSE JACKET ». Herald of Khmelnytskyi National University. Technical sciences 315, n^o 6(1) (29 décembre 2022) : 61–65. http://dx.doi.org/10.31891/2307-5732-2022-315-6-61-65.

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The results of research into the properties of modern textile materials, in particular, insulating materials, are presented for choosing a package of textile materials that will be the most effective in terms of quality for the production of a special-purpose jacket that will be used in low-temperature conditions. As insulating materials for the study of consumer properties of textile material packages, the material вЂњTinsuletвЂќ, batting and sintepon, upper fabric вЂњOxfordвЂќ, lining fabric вЂњNylonвЂќ were used. Both the materials themselves and the packages of textile materials from the top fabric вЂњOxfordвЂќ, insulation material and lining fabric вЂњNylonвЂќ were studied. It is assumed that the choice of insulating material is among the presented assortment on the market of Ukraine. It was established that the most effective package is the package using the insulating material вЂњTinsuletвЂќ. This package is characterized by the highest indicators of breaking load and air permeability, as well as the lowest surface density. All tested materials meet the requirements specified in DSTU EN 14058:2008. Today it is becoming relevant to study and compare the properties of the insulation material вЂњTinsuleitвЂќ with the materials of batting and sintepon, which are actively used by manufacturers in Ukraine. Therefore, it became necessary to compare the performance of one of the most modern insulating materials, вЂњTinsuleitвЂќ, with batting, which has been used for about a hundred years, but which is almost gone in Europe and the USA. Rational results, which testify to the absolute superiority of the insulation material вЂњTinsuleitвЂќ, were provided when evaluating the indicators of breaking load, air permeability, surface density of the insulation materials вЂњTinsuleitвЂќ, sintepon, batting, top fabric вЂњOxfordвЂќ and lining fabric вЂњNylonвЂќ separately and in composition of packages of textile materials. Therefore, in the case of replacement in the production of special clothing, insulation materials of batting and sintepon with вЂњTinsuleitвЂќ during the production in Ukraine, the term of use of special clothing will be significantly increased due to the improvement of strength properties, and the economic efficiency of its use will significantly improve. Increasing breathability and reducing the weight of clothing will provide opportunities for longer stay in low temperature conditions and have greater mobility and mobility of the consumer, thanks to which the demand for this special clothing will only grow.

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Choi, Seungyeop, Nayeon Kim, Dahee Jin, Youngjoon Roh et Yong Min Lee. « Li Dendrite Formation on the Side of Cu Current Collector during Charging in Misaligned Pouch-Type Lithium-Ion Batteries ». ECS Meeting Abstracts MA2023-01, n^o 55 (28 août 2023) : 2676. http://dx.doi.org/10.1149/ma2023-01552676mtgabs.

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Not only high-capacity electrode materials but also electrode/cell design greatly governs the electrochemical performance of LIBs. For instance, there are systematic works to unravel the effect of area or capacity ratio between anode and cathode or the electrolyte amount. [1,2,3] Especially, our research group has already reported the effect of electrode misalignment, which can frequently occur during the coin cell assembly, on the electrochemical properties, where Li dendrites formed on the coin cell bottom mainly deteriorated the cell performance. [4] However, considering the commercial cell configurations like pouch-type LIBs, which have insulating polypropylene inner layer, those negative phenomena should be evaluated in misaligned LIB cells. For this purpose, three pouch-type cells (well-aligned, slightly misaligned, and largely misaligned) using LixNi0.6Co0.2Mn0.2O2 cathode and graphite anode were fabricated in a dry room. Surprisingly, a similar misalignment effect to coin cells was also observed in the pouch-type cell, even though the inner layer of the Al-pouch is insulative. When we disassembled the misaligned cell after precycling, we could observe Li dendrites formed on the side of the Cu current collector (CC) of the anode. That is, the Li ions from the cathode are able to be plated on the metal side of Cu CC of a few micrometer thickness. Thus, even in pouch cells, the electrode misalignment can lead to Li inventory loss. To solve this problem, an insulating coating was applied to the side of the Cu CC, and as a result, the cycle performance of the misaligned cell was improved by suppressing the Li dendrite formation. In addition, the electrochemical characteristics were compared as a function of the lithiation state (SOL, x in LixNi0.6Co0.2Mn0.2O2) using EIS, DC-IR, XRD, etc. Reference B. Son, Y. M. Lee et al., J. Power Sources , 243 (2013) 641-647 R. Xue et al., J. Power Sources , 55 (1995) 111-114 B. R. Long, J. R. Croy et al., J. Electrochem. Soc. , 163 (2016) A2999 N. Kim, Y. M. Lee et al., J. Electrochem. Soc. , 169 (2022) 023502

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Feng, Xiao Ping, Chun Ting Li et Jun Jie Wu. « Thermal Simulation Analysis of Insulation of the New Heat-Insulation Bricks ». Applied Mechanics and Materials 584-586 (juillet 2014) : 1536–40. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1536.

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Using the ANSYS thermal analysis module to do steady thermal analysis of given heat-insulating bricks. The results show that this kind of bricks can achieve better insulation in both sides; when the thermal conductivity of the heat insulating material in the hole space are less than 0.3 W/(m·K), the bricks can obtain the good insulation effect; the smaller the heat conductivity coefficients of the bricks materials and filling materials are, the better insulation bricks can achieve.

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Yakovchuk, R., A. Kuzyk, O. Miller et A. Lyn. « HEAT INSULATION-APPARATUS SYSTEMS OF HOUSEHOLD FACADE AS A FACTOR OF INCREASED FIRE HAZARD ». Fire Safety, n^o 32 (14 août 2018) : 80–89. http://dx.doi.org/10.32447/20786662.32.2018.12.

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The paper analyzes the problems associated with the fire hazard of the application of thermal insulation and finishing systems of facades of buildings, which directly depends on the design solution of the thermal insulation system and the type of thermal insulation material. The generalized requirements for physical and technical indicators of the quality of heat-insulating materials; the possibility of applying facade heat insulation structures depending on their class, the height of the houses and the combustibility of the materials of the heat-insulating and finishing layers; fire-technical characteristics of expanded polystyrene are considered. The threats of fire spreading by thermal insulation systems of facades are analyzed and possible ways of its propagation between floors are considered. It is concluded that the use of combustible thermal insulating materials poses an increased danger to life and health of people during a fire. The problem of ensuring the fire safety of buildings, in which the insulation and finishing systems of exterior walls are used, depends on a number of factors and requires a more thorough study.

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Wang, Lingling, Bowen Chen, Chao Zhang et Guoqiang Li. « Experimental study on insulative properties of intumescent coating exposed to standard and nonstandard furnace curves ». Fire and Materials 43, n^o 7 (10 juillet 2019) : 782–93. http://dx.doi.org/10.1002/fam.2737.

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Capacchione, Amanda, Nima Talebzadeh, Mubariz Nagi, Thomas Cooper, Paul O'Brien et Marina Freire-Gormaly. « Characterization of the Photothermal Response in Nanocomposite Silica Aerogel Materials with Thin Metal Films ». ECS Meeting Abstracts MA2023-02, n^o 61 (22 décembre 2023) : 3434. http://dx.doi.org/10.1149/ma2023-02613434mtgabs.

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The photothermal effect, whereby light energy is converted into thermal energy when absorbed in a material, is a phenomenon that has many potential applications including solar-driven water heating and purification, and radiative heat transfer. Recently, porous materials have been tailored to exhibit the photothermal effect to be used for interfacial water evaporation and sterilization. In this work we provide the characterization of the solar-driven photothermal effect on nanocomposite aerogel materials. Aerogels exhibit a unique combination of properties that can enhance their utility as a photothermal material. Due to their inherently low density and thermal conductivity, and their exceptional insulative properties, photothermal heat generated within an aerogel can remain trapped. This work presents the photothermal effect in nanocomposite aerogels fabricated by sputtering metal and metal oxide films onto and into aerogels materials. By sputtering metal and metal oxides in a high vacuum environment and directing it towards an aerogel substrate using a magnetron, we were able to deposit thin films onto the surface of an aerogel. The composite aerogels are characterized using scanning electron microscopy (SEM) to assess the depth of the sputtered material into the aerogel pores. The reflectance and transmittance of the aerogel composites are measured using UV-Vis spectroscopy. The photothermal effect in aerogel composites is measured using thermal imaging. Our results show that the photothermal response of the composite aerogels can be tuned by varying the thickness and composition of the deposited films. Overall, our study demonstrates the potential of using magnetron sputtering to create composite aerogels with tailored photothermal properties. This opens new opportunities for a wide range of applications such as water and air heating and purification, water desalination, and solar energy harvesting devices.

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Malelis, P., et M. Danikas. « Insulating Materials at Very Low Temperatures : A Short Review ». Engineering, Technology & ; Applied Science Research 10, n^o 3 (7 juin 2020) : 5590–95. http://dx.doi.org/10.48084/etasr.3410.

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In this paper, a short review is given on insulating materials at very low temperatures. Various insulating materials are investigated in terms of phenomena such as partial discharges. Some of the factors affecting the behavior of the insulating materials at very low temperatures, such as the quality of electrode surface, the stressed insulation volume and the existing bubbles, are also reported and commented upon. Proposals for future research are also discussed.

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Shankar, V., et C. E. Hagentoft. « Numerical Investigation of Natural Convection in Horizontal Porous Media Heated from Below—Comparisons with Experiments ». Journal of Thermal Envelope and Building Science 23, n^o 4 (avril 2000) : 318–38. http://dx.doi.org/10.1177/174425910002300403.

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Thick layers of highly permeable loose-fill insulation are used to thermally insulate attics in modern building technology. Since the use of highly permeable insulation leads to an increase in air movement not only in the porous layer (insulation) but also in the fluid layer (attics), it is therefore of paramount interest to determine the influence of the complex heat transfer phenomena due to natural and forced convection on the thermal properties of insulating porous medium with air cavity. With the help of CFD (Computational Fluid Dynamics), the combined effect of air movement inside the insulation and the air cavity is investigated. The paper deals with the CFD analysis, carried out in order to predict the effects of natural convection on the thermal performance of the building envelope. The results obtained from the numerical computations are compared with experimental findings.

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